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产品型号CAT1027LI-25-G的Datasheet PDF文件预览

CAT1026, CAT1027  
Dual Voltage Supervisory Circuits with  
I²C Serial 2k-bit CMOS EEPROM  
supply monitor and reset circuit protects memory and  
FEATURES  
systems controllers during power up/down and  
against brownout conditions. If power supply voltages  
are out of tolerance reset signals become active  
preventing the system microcontroller, ASIC, or  
peripherals from operating.  
Precision VCC Power Supply Voltage Monitor  
5 V, 3.3 V and 3 V systems  
Five threshold voltage options  
Additional voltage monitoring  
Externally adjustable down to 1.25 V  
Watchdog timer (CAT1027 only)  
Active High or Low Reset  
The CAT1026 features two open drain reset outputs:  
¯¯¯¯¯¯  
one (RESET) drives high and the other (RESET)  
drives low whenever VCC falls below the threshold.  
Reset outputs become inactive typically 200ms after  
the supply voltage exceeds the reset threshold value.  
With both active high and low reset signals, interface  
to microcontrollers and other ICs is simple. CAT1027  
Valid reset guaranteed at VCC = 1 V  
400 kHz I2C Bus  
2.7 V to 5.5 V Operation  
¯¯¯¯¯¯  
¯¯¯¯¯¯  
has only a RESET output. In addition, the RESET pin  
can be used as an input for push-button manual reset  
capability.  
Low power CMOS technology  
16-Byte Page Write Buffer  
Built-in inadvertent write protection  
1,000,000 Program/Erase cycles  
Manual Reset capability  
The CAT1026 and CAT1027 provide an auxiliary  
voltage sensor input, VSENSE, which is used to monitor a  
second system supply. The auxiliary high impedance  
comparator drives the open drain output, VLOW  
whenever the sense voltage is below 1.25 V threshold.  
,
100 year data retention  
Industrial and extended temperature ranges  
The CAT1027 is designed with a 1.6 second  
watchdog timer circuit that resets a system to a known  
state if software or a hardware glitch halts or “hangs”  
the system. The CAT1027 features a watchdog timer  
interrupt input, WDI.  
8-pin DIP, SOIC, TSSOP, MSOP or TDFN  
(3 x 3 mm foot-print) packages  
TDFN max height is 0.8 mm  
For Ordering Information details, see page 19.  
The on-chip 2k-bit EEPROM memory features a 16-byte  
page. In addition, hardware data protection is provided  
by a VCC sense circuit that prevents writes to memory  
whenever VCC falls below the reset threshold or until VCC  
reaches the reset threshold during power up.  
DESCRIPTION  
The CAT1026 and CAT1027 are complete memory  
and supervisory solutions for microcontroller-based  
systems. A 2k-bit serial EEPROM memory and a  
system power supervisor with brown-out protection  
are integrated together in low power CMOS techno–  
logy. Memory interface is via a 400 kHz I2C bus.  
Available packages include 8-pin DIP and surface  
mount, 8-pin SO, 8-pin TSSOP, 8-pin TDFN and 8-pin  
MSOP packages. The TDFN package thickness is  
0.8 mm maximum. TDFN footprint is 3 x 3 mm.  
The CAT1026 and CAT1027 provide a precision VCC  
sense circuit with five reset threshold voltage options  
that support 5 V, 3.3 V and 3 V systems. The power  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
1
Doc. No. MD-3010 Rev. P  
CAT1026, CAT1027  
BLOCK DIAGRAM  
RESET THRESHOLD OPTION  
EXTERNAL LOAD  
Part Dash  
Number  
Minimum  
Threshold  
Maximum  
Threshold  
SENSEAMPS  
SHIFT REGISTERS  
D
OUT  
ACK  
V
CC  
-45  
-42  
-30  
-28  
-25  
4.50  
4.25  
3.00  
2.85  
2.55  
4.75  
4.50  
3.15  
3.00  
2.70  
WORDADDRESS  
BUFFERS  
COLUMN  
DECODERS  
V
SS  
START/STOP  
LOGIC  
SDA  
2kbit  
EEPROM  
XDEC  
CONTROL  
LOGIC  
DATA IN STORAGE  
V
CC Monitor  
HIGHVOLTAGE/  
TIMING CONTROL  
V
CC  
STATE COUNTERS  
SCL  
SLAVE  
ADDRESS  
COMPARATORS  
+
-
RESET  
Controller  
WDI  
(CAT1027)  
V
REF  
AuxiliaryVoltage Monitor  
RESET  
(CAT1026)  
RESET  
V
+
-
SENSE  
V
LOW  
V
REF  
PIN CONFIGURATION  
DIP Package (L)  
(Bottom View)  
SOIC Package (W)  
TSSOP Package (Y)  
MSOP Package (Z)  
TDFN Package: 3mm x 3mm  
0.8mm maximum height - (ZD4)  
VCC  
RESET  
SCL  
8
7
6
5
1
2
3
4
VLOW  
VLOW  
1
2
3
4
8
7
6
5
VCC  
¯¯¯¯¯¯  
RESET  
¯¯¯¯¯¯  
RESET  
RESET  
SCL  
CAT1026  
CAT1027  
CAT1026  
CAT1027  
VSENSE  
VSS  
VSENSE  
VSS  
SDA  
SDA  
VLOW  
1
2
3
4
8
7
6
5
VCC  
VCC  
WDI  
SCL  
SDA  
8
7
6
5
1
2
3
4
VLOW  
¯¯¯¯¯¯  
RESET  
WDI  
SCL  
SDA  
¯¯¯¯¯¯  
RESET  
VSENSE  
VSS  
VSENSE  
VSS  
Doc. No. MD-3010 Rev. P  
2
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
CAT1026, CAT1027  
PIN FUNCTION  
PIN DESCRIPTION  
Pin  
Name  
¯¯¯¯¯¯  
RESET  
¯¯¯¯¯¯  
(RESET CAT1026 Only)  
These are open drain pins and RESET can be used  
as a manual reset trigger input. By forcing a reset  
condition on the pin the device will initiate and  
maintain a reset condition. The RESET pin must be  
connected through a pull-down resistor, and the  
Function  
Active Low Reset Input/Output  
RESET/RESET: RESET OUTPUTs  
¯¯¯¯¯¯  
VSS  
SDA  
SCL  
Ground  
Serial Data/Address  
Clock Input  
¯¯¯¯¯¯  
resistor.  
Active High Reset Output  
(CAT1026 only)  
RESET pin must be connected through a pull-up  
RESET  
VCC  
VSENSE  
VLOW  
Power Supply  
SDA: SERIAL DATA ADDRESS  
Auxiliary Voltage Monitor Input  
Auxiliary Voltage Monitor Output  
The bidirectional serial data/address pin is used to  
transfer all data into and out of the device. The SDA  
pin is an open drain output and can be wire-ORed  
with other open drain or open collector outputs.  
Watchdog Timer Interrupt  
(CAT1027 only)  
WDI  
SCL: SERIAL CLOCK  
Serial clock input.  
OPERATING TEMPERATURE RANGE  
VSENSE: AUXILIARY VOLTAGE MONITOR INPUT  
The VSENSE input is a second voltage monitor which is  
compared against CAT1026 and CAT1027 internal  
reference voltage of 1.25 V typically. Whenever the  
input voltage is lower than 1.25 V, the open drain VLOW  
output will be driven low. An external resistor divider is  
used to set the voltage level to be sensed. Connect  
VSENSE to VCC if unused.  
Industrial  
-40ºC to 85ºC  
Extended -40ºC to 125ºC  
VLOW: AUXILIARY VOLTAGE MONITOR OUTPUT  
This open drain output goes low when VSENSE is less  
than 1.25 V and goes high when VSENSE exceeds the  
reference voltage.  
WDI (CAT1027 Only): WATCHDOG TIMER INTERRUPT  
Watchdog Timer Interrupt Input is used to reset the  
watchdog timer. If a transition from high to low or low  
to high does not occur every 1.6 seconds, the RESET  
outputs will be driven active.  
CAT10XX FAMILY OVERVIEW  
Manual  
Reset  
Input Pin  
Watchdog  
Monitor  
Pin  
Write  
Protection  
Pin  
Independent  
Auxiliary  
Voltage Sense  
RESET:  
Active High  
and LOW  
Device  
Watchdog  
EEPROM  
CAT1021  
CAT1022  
CAT1023  
CAT1024  
CAT1025  
CAT1026  
CAT1027  
SDA  
SDA  
WDI  
2k  
2k  
2k  
2k  
2k  
2k  
2k  
ꢁ ꢁ  
ꢁ ꢁ  
ꢁ ꢁ  
ꢁ ꢁ  
ꢁ ꢁ  
WDI  
For supervisory circuits with embedded 16k EEPROM, please refer to the CAT1161, CAT1162 and CAT1163  
data sheets.  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
3
Doc. No. MD-3010 Rev. P  
CAT1026, CAT1027  
ABSOLUTE MAXIMUM RATINGS(1)  
Parameters  
Ratings  
–55 to +125  
–65 to +150  
–2.0 to VCC + 2.0  
–2.0 to 7.0  
1.0  
Units  
ºC  
ºC  
V
Temperature Under Bias  
Storage Temperature  
Voltage on any Pin with Respect to Ground(2)  
VCC with Respect to Ground  
V
Package Power Dissipation Capability (TA = 25°C)  
Lead Soldering Temperature (10 s)  
Output Short Circuit Current(3)  
W
300  
ºC  
mA  
100  
D.C. OPERATING CHARACTERISTICS  
VCC = 2.7 V to 5.5 V and over the recommended temperature conditions unless otherwise specified.  
Symbol Parameter  
Test Conditions  
VIN = GND to VCC  
VIN = GND to VCC  
Min  
-2  
Typ  
Max  
10  
Units  
µA  
ILI  
Input Leakage Current  
ILO  
Output Leakage Current  
-10  
10  
µA  
Power Supply Current  
(Write)  
f
SCL = 400 kHz  
ICC1  
ICC2  
ISB  
3
1
mA  
mA  
µA  
VCC = 5.5 V  
Power Supply Current  
(Read)  
fSCL = 400 kHz  
VCC = 5.5 V  
CAT1026  
CAT1027  
50  
60  
Vcc = 5.5 V,  
VIN = GND or VCC  
Standby Current  
(4)  
VIL  
VIH  
Input Low Voltage  
Input High Voltage  
Output Low Voltage  
-0.5  
0.3 x VCC  
V
V
(4)  
0.7 x VCC  
VCC + 0.5  
IOL = 3 mA  
VOL  
VOH  
0.4  
V
¯¯¯¯¯¯  
(SDA, RESET)  
VCC = 2.7 V  
Output High Voltage  
(RESET)  
IOH = -0.4 mA  
V
CC - 0.75  
V
V
VCC = 2.7 V  
CAT102x-45 (VCC = 5.0 V)  
CAT102x-42 (VCC = 5.0 V)  
CAT102x-30 (VCC = 3.3 V)  
CAT102x-28 (VCC = 3.3 V)  
CAT102x-25 (VCC = 3.0 V)  
4.50  
4.25  
3.00  
2.85  
2.55  
4.75  
4.50  
3.15  
3.00  
2.70  
VTH  
Reset Threshold  
Reset Output Valid VCC  
Voltage  
VRVALID  
1.00  
15  
V
(5)  
VRT  
Reset Threshold Hysteresis  
mV  
VS  
Auxiliary Voltage Monitor  
Threshold  
VREF  
1.2  
1.25  
1.3  
Notes:  
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings  
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this  
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.  
(2) The minimum DC input voltage is -0.5 V. During transitions, inputs may undershoot to -2.0 V for periods of less than 20 ns. Maximum DC  
voltage on output pins is VCC +0.5 V, which may overshoot to VCC +2.0 V for periods of less than 20 ns.  
(3) Output shorted for no more than one second. No more than one output shorted at a time.  
(4) VIL min and VIH max are reference values only and are not tested.  
(5) This parameter is tested initially and after a design or process change that affects the parameter. Not 100% tested.  
Doc. No. MD-3010 Rev. P  
4
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
CAT1026, CAT1027  
CAPACITANCE  
TA = 25ºC, f = 1.0 MHz, VCC = 5 V  
Symbol Test  
Test Conditions  
VOUT = 0 V  
Max  
8
Units  
pF  
(1)  
COUT  
Output Capacitance  
Input Capacitance  
(1)  
CIN  
VIN = 0 V  
6
pF  
AC CHARACTERISTICS  
CC = 2.7 V to 5.5 V and over the recommended temperature conditions, unless otherwise specified.  
V
Memory Read & Write Cycle(2)  
Symbol Parameter  
Min  
Max  
400  
100  
Units  
kHz  
ns  
fSCL  
tSP  
tLOW  
tHIGH  
Clock Frequency  
Input Filter Spike Suppression (SDA, SCL)  
Clock Low Period  
1.3  
0.6  
µs  
Clock High Period  
µs  
(1)  
tR  
SDA and SCL Rise Time  
300  
300  
ns  
(1)  
tF  
SDA and SCL Fall Time  
ns  
tHD; STA  
tSU; STA  
tHD; DAT  
tSU; DAT  
tSU; STO  
tAA  
Start Condition Hold Time  
0.6  
0.6  
0
µs  
Start Condition Setup Time (for a Repeated Start)  
Data Input Hold Time  
µs  
ns  
Data Input Setup Time  
100  
0.6  
ns  
Stop Condition Setup Time  
SCL Low to Data Out Valid  
Data Out Hold Time  
µs  
900  
5
ns  
tDH  
50  
ns  
(1)  
tBUF  
Time the Bus must be Free Before a New Transmission Can Start  
Write Cycle Time (Byte or Page)  
1.3  
µs  
(3)  
tWC  
ms  
Notes:  
(1) This parameter is characterized initially and after a design or process change that affects the parameter. Not 100% tested.  
(2) Test Conditions according to “AC Test Conditions” table.  
(3) The write cycle time is the time from a valid stop condition of a write sequence to the end of the internal program/erase cycle. During the  
write cycle, the bus interface circuits are disabled, SDA is allowed to remain high and the device does not respond to its slave address.  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
5
Doc. No. MD-3010 Rev. P  
CAT1026, CAT1027  
VOLTAGE MONITOR AND RESET CIRCUIT AC CHARACTERISTICS  
Symbol  
tPURST  
tRDP  
Parameter  
Test Conditions  
Note 2  
Min  
Typ  
Max  
270  
5
Units  
ms  
µs  
Reset Timeout  
130  
200  
VTH to RESET Output Delay  
VCC Glitch Reject Pulse Width  
Watchdod Timeout  
VSENSE to VLOW Delay  
Note 3  
tGLITCH  
tWD  
Note 4, 5  
Note 11  
30  
2.1  
5
ns  
1.0  
1.6  
s
tRPD2  
Note 5  
µs  
POWER-UP TIMING (6), (7)  
Symbol  
tPUR  
Parameter  
Test Conditions  
Min  
Typ  
Max  
270  
270  
Units  
ms  
Power-Up to Read Operation  
Power-Up to Write Operation  
tPUW  
ms  
AC TEST CONDITIONS  
Parameter  
Test Conditions  
0.2 x VCC to 0.8 x VCC  
10 ns  
Input Pulse Voltages  
Input Rise and Fall Times  
Input Reference Voltages  
Output Reference Voltages  
Output Load  
0.3 x VCC, 0.7 x VCC  
0.5 x VCC  
Current Source: IOL = 3 mA; CL = 100 pF  
RELIABILITY CHARACTERISTICS  
Symbol Parameter  
Reference Test Method  
MIL-STD-883, Test Method 1033  
MIL-STD-883, Test Method 1008  
MIL-STD-883, Test Method 3015  
JEDEC Standard 17  
Min  
Max  
Units  
(6)  
NEND  
Endurance  
1,000,000  
100  
Cycles/Byte  
Years  
(6)  
TDR  
Data Retention  
ESD Susceptibility  
Latch-Up  
(6)  
VZAP  
2000  
Volts  
(6)(8)  
ILTH  
100  
mA  
Notes:  
(1) Test Conditions according to “AC Test Conditions” table.  
(2) Power-up, Input Reference Voltage VCC = VTH, Reset Output Reference Voltage and Load according to “AC Test Conditions” Table  
(3) Power-Down, Input Reference Voltage VCC = VTH, Reset Output Reference Voltage and Load according to “AC Test Conditions” Table  
(4) VCC Glitch Reference Voltage = VTHmin; Based on characterization data  
5) 0 < VSENSE - VCC, VLOW Output Reference Voltage and Load according to “AC Test Conditions” Table.  
(6) This parameter is characterized initially and after a design or process change that affects the parameter. Not 100% tested.  
(7) tPUR and tPUW are the delays required from the time VCC is stable until the specified memory operation can be initiated.  
(8) Latch-up protection is provided for stresses up to 100mA on input and output pins from -1 V to VCC + 1 V.  
Doc. No. MD-3010 Rev. P  
6
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
CAT1026, CAT1027  
DEVICE OPERATION  
reduce the system power consumption. The VLOW  
output can be externally connected to the RESET  
output to generate a reset condition when either of the  
supplies is invalid. In other applications, VLOW signal  
can be used to interrupt the system controller for an  
impending power failure notification.  
Reset Controller Description  
The CAT1026 and CAT1027 precision RESET  
controllers ensure correct system operation during  
brownout and power up/down conditions. They are  
configured with open drain RESET outputs.  
During power-up, the RESET outputs remain active  
until VCC reaches the VTH threshold and will continue  
Data Protection  
The CAT1026 and CAT1027 devices have been desig-  
ned to solve many of the data corruption issues that  
have long been associated with serial EEPROMs. Data  
corruption occurs when incorrect data is stored in a  
memory location which is assumed to hold correct data.  
driving the outputs for approximately 200 ms (tPURST  
)
after reaching VTH. After the tPURST timeout interval, the  
device will cease to drive the reset outputs. At this  
point the reset outputs will be pulled up or down by  
their respective pull up/down resistors.  
Whenever the device is in a Reset condition, the  
embedded EEPROM is disabled for all operations,  
including write operations. If the Reset output(s) are  
active, in progress communications to the EEPROM  
are aborted and no new communications are allowed.  
In this condition an internal write cycle to the memory  
can not be started, but an in progress internal non-  
volatile memory write cycle can not be aborted. An  
internal write cycle initiated before the Reset condition  
can be successfully finished if there is enough time  
(5 ms) before VCC reaches the minimum value of 2 V.  
During power-down, the RESET outputs will be active  
¯¯¯¯¯¯  
when VCC falls below VTH. The RESET output will be  
valid so long as VCC is >1.0 V (VRVALID). The device is  
designed to ignore the fast negative going VCC transi-  
ent pulses (glitches).  
Reset output timing is shown in Figure 1.  
Manual Reset Capability  
¯¯¯¯¯¯  
The RESET pin can operate as reset output and  
manual reset input. The input is edge triggered; that  
¯¯¯¯¯¯  
is, the RESET input will initiate a reset timeout after  
In addition, to avoid data corruption due to the loss of  
power supply voltage during the memory internal write  
operation, the system controller should monitor the  
unregulated DC power. Using the second voltage  
sensor, VSENSE, to monitor an unregulated power  
supply, the CAT1026 and CAT1027 signals an impen-  
ding power failure by setting VLOW low.  
detecting a high to low transition.  
¯¯¯¯¯¯  
When RESET I/O is driven to the active state, the  
200 ms timer will begin to time the reset interval. If  
external reset is shorter than 200 ms, Reset outputs  
will remain active at least 200 ms.  
Monitoring Two Voltages  
Watchdog Timer  
The CAT1026 and CAT1027 feature a second voltage  
sensor, VSENSE, which drives the open drain VLOW  
output low whenever the input voltage is below  
1.25 V. The auxiliary voltage monitor timing is shown  
in Figure 2.  
The Watchdog Timer provides an independent protec-  
tion for microcontrollers. During a system failure, the  
CAT1027 device will provide a reset signal after a  
time-out interval of 1.6 seconds for a lack of activity.  
CAT1027 is designed with the Watchdog timer feature  
on the WDI pin. If WDI does not toggle within 1.6  
second intervals, the reset condition will be generated  
on reset output. The watchdog timer is cleared by any  
transition on monitored line.  
By using an external resistor divider the sense  
circuitry can be set to monitor a second supply in the  
system. The circuit shown in Figure 3 provides an  
externally adjustable threshold voltage, VTH_ADJ to  
monitor the auxiliary voltage. The low leakage current  
at VSENSE allows the use of large value resistors, to  
As long as reset signal is asserted, the watchdog  
timer will not count and will stay cleared.  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
7
Doc. No. MD-3010 Rev. P  
CAT1026, CAT1027  
Figure 1. RESET Output Timing  
tGLITCH  
VTH  
V
RVALID  
tRPD  
tPURST  
VCC  
tRPD  
tPURST  
RESET  
RESET  
Figure 2: Auxiliary Voltage Monitor Timing  
V
REF  
V
SENSE  
t
t
t
t
RPD2  
RPD2  
RPD2  
RPD2  
V
LOW  
Figure 3: Auxiliary Voltage Monitor  
V
CC  
V
AUX  
CAT1026/27  
Externally adjustable  
Power Fail  
Interrupt  
threshold  
V
LOW  
R
1
V
TH-ADJ  
V
SENSE  
R
2
R
R
2
R
1 +  
R
2
+
1
V
= V  
×
= 1.25V ×  
TH-ADJ  
REF  
R
R
2
2
Doc. No. MD-3010 Rev. P  
8
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
CAT1026, CAT1027  
EMBEDDED EEPROM OPERATION  
The CAT1026 and CAT1027 feature a 2-kbit embedded  
serial EEPROM that supports the I2C Bus data  
transmission protocol. This Inter-Integrated Circuit Bus  
protocol defines any device that sends data to the bus to  
be a transmitter and any device receiving data to be a  
receiver. The transfer is controlled by the Master device  
which generates the serial clock and all START and  
STOP conditions for bus access. Both the Master device  
and Slave device can operate as either transmitter  
or receiver, but the Master device controls which mode  
is activated.  
monitor the SDA and SCL lines and will not respond  
until this condition is met.  
STOP CONDITION  
A LOW to HIGH transition of SDA when SCL is HIGH  
determines the STOP condition. All operations must  
end with a STOP condition.  
DEVICE ADDRESSING  
The Master begins a transmission by sending a  
START condition. The Master sends the address of  
the particular slave device it is requesting. The four  
most significant bits of the 8-bit slave address are  
programmable in metal and the default is 1010.  
I2C BUS PROTOCOL  
The features of the I2C bus protocol are defined as  
follows:  
(1) Data transfer may be initiated only when the bus  
is not busy.  
The last bit of the slave address specifies whether a  
Read or Write operation is to be performed. When this  
bit is set to 1, a Read operation is selected, and when  
set to 0, a Write operation is selected.  
(2) During a data transfer, the data line must remain  
stable whenever the clock line is high. Any  
changes in the data line while the clock line is  
high will be interpreted as a START or STOP  
condition.  
After the Master sends a START condition and the  
slave address byte, the CAT1026 and CAT1027  
monitor the bus and responds with an acknowledge  
(on the SDA line) when its address matches the  
transmitted slave address. The CAT1026 and  
CAT1027 then perform a Read or Write operation  
START CONDITION  
The START Condition precedes all commands to the  
device, and is defined as a HIGH to LOW transition of  
SDA when SCL is HIGH. The CAT1026 and CAT1027  
¯¯  
depending on the R/W bit.  
Figure 3. Bus Timing  
t
t
t
F
HIGH  
R
t
t
LOW  
LOW  
SCL  
t
t
HD:DAT  
SU:STA  
t
t
t
t
HD:STA  
SU:DAT  
SU:STO  
SDA IN  
BUF  
t
t
DH  
AA  
SDA OUT  
Figure 4. Write Cycle Timing  
SCL  
SDA  
8TH BIT  
BYTE n  
ACK  
t
WR  
STOP  
CONDITION  
START  
CONDITION  
ADDRESS  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
9
Doc. No. MD-3010 Rev. P  
CAT1026, CAT1027  
ACKNOWLEDGE  
WRITE OPERATIONS  
After a successful data transfer, each receiving  
device is required to generate an acknowledge. The  
acknowledging device pulls down the SDA line  
during the ninth clock cycle, signaling that it received  
the 8 bits of data.  
Byte Write  
In the Byte Write mode, the Master device sends the  
START condition and the slave address information  
(with the R/W bit set to zero) to the Slave device. After  
¯¯  
the Slave generates an acknowledge, the Master sends  
a 8-bit address that is to be written into the address  
pointers of the device. After receiving another acknow-  
ledge from the Slave, the Master device transmits the  
data to be written into the addressed memory location.  
The CAT1026 and CAT1027 acknowledge once more  
and the Master generates the STOP condition. At this  
time, the device begins an internal programming cycle  
to non-volatile memory. While the cycle is in progress,  
the device will not respond to any request from the  
Master device.  
The CAT1026 and CAT1027 respond with an  
acknowledge after receiving a START condition and  
its slave address. If the device has been selected  
along with a write operation, it responds with an  
acknowledge after receiving each 8-bit byte.  
When the CAT1026 and CAT1027 begin a READ  
mode it transmits 8 bits of data, releases the SDA  
line and monitors the line for an acknowledge. Once  
it receives this acknowledge, the CAT1026 and  
CAT1027 will continue to transmit data. If no  
acknowledge is sent by the Master, the device  
terminates data transmission and waits for a STOP  
condition.  
Figure 5. Start/Stop Timing  
SDA  
SCL  
START BIT  
STOP BIT  
Figure 6. Acknowledge Timing  
SCL FROM  
MASTER  
1
8
9
DATA OUTPUT  
FROM TRANSMITTER  
DATA OUTPUT  
FROM RECEIVER  
START  
ACKNOWLEDGE  
Figure 7: Slave Address Bits  
Default Configuration  
1
0
1
0
0
0
0
R/W  
Doc. No. MD-3010 Rev. P  
10  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
CAT1026, CAT1027  
Page Write  
The CAT1026 and CAT1027 write up to 16 bytes of  
data in a single write cycle, using the Page Write  
operation. The page write operation is initiated in the  
same manner as the byte write operation, however  
instead of terminating after the initial byte is  
transmitted, the Master is allowed to send up to 15  
additional bytes. After each byte has been transmitted,  
the CAT1026 and CAT1027 will respond with an  
acknowledge and internally increment the lower order  
address bits by one. The high order bits remain  
unchanged.  
If the Master transmits more than 16 bytes before  
sending the STOP condition, the address counter  
‘wraps around,’ and previously transmitted data will be  
overwritten.  
When all 16 bytes are received, and the STOP condition  
has been sent by the Master, the internal programming  
cycle begins. At this point, all received data is written to  
the CAT1026 and CAT1027 in a single write cycle.  
Figure 8. Byte Write Timing  
S
T
A
R
T
S
T
O
P
BUS ACTIVITY:  
MASTER  
SLAVE  
ADDRESS  
BYTE  
ADDRESS  
DATA  
SDA LINE  
S
P
A
C
K
A
C
K
A
C
K
Figure 9: Page Write Timing  
S
T
A
R
T
S
T
O
P
BUS ACTIVITY:  
MASTER  
SLAVE  
ADDRESS  
BYTE  
ADDRESS (n)  
DATA n  
DATA n+1  
DATA n+15  
SDA LINE  
S
P
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
11  
Doc. No. MD-3010 Rev. P  
CAT1026, CAT1027  
Acknowledge Polling  
READ OPERATIONS  
Disabling of the inputs can be used to take  
advantage of the typical write cycle time. Once the  
stop condition is issued to indicate the end of the  
host’s write opration, the CAT1026 and CAT1027  
initiates the internal write cycle. ACK polling can be  
initiated immediately. This involves issuing the start  
condition followed by the slave address for a write  
operation. If the device is still busy with the write  
operation, no ACK will be returned. If a write  
operation has completed, an ACK will be returned  
and the host can then proceed with the next read or  
write operation.  
The READ operation for the CAT1026 and CAT1027 is  
initiated in the same manner as the write operation with  
¯¯  
one exception, the R/W bit is set to one. Three different  
READ operations are possible: Immediate/Current  
Address READ, Selective/Random READ and  
Sequential READ.  
Figure 10. Immediate Address Read Timing  
S
T
A
R
T
S
T
O
P
BUS ACTIVIT Y:  
MASTER  
SLAVE  
ADDRESS  
SDA LINE  
S
P
A
C
K
N
O
DATA  
A
C
K
SCL  
SDA  
8
9
8TH BIT  
DATA OUT  
NO ACK  
STOP  
Doc. No. MD-3010 Rev. P  
12  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
CAT1026, CAT1027  
Immediate/Current Address Read  
Sequential Read  
The CAT1026 and CAT1027 address counter  
contains the address of the last byte accessed,  
incremented by one. In other words, if the last READ  
or WRITE access was to address N, the READ  
immediately following would access data from  
address N + 1. For N = E = 255, the counter will  
wrap around to zero and continue to clock out valid  
data. After the CAT1026and CAT1027 receive its  
The Sequential READ operation can be initiated by  
either the Immediate Address READ or Selective READ  
operations. After the CAT1026 and CAT1027 sends the  
inital 8-bit byte requested, the Master will responds with  
an acknowledge which tells the device it requires more  
data. The CAT1026 and CAT1027 will continue to  
output an 8-bit byte for each acknowledge, thus sending  
the STOP condition.  
¯¯  
slave address information (with the R/W bit set to  
The data being transmitted from the CAT1026 and  
CAT1027 is sent sequentially with the data from  
address N followed by data from address N + 1. The  
READ operation address counter increments all of the  
CAT1026 and CAT1027 address bits so that the entire  
memory array can be read during one operation.  
one), it issues an acknowledge, then transmits the  
8-bit byte requested. The master device does not  
send an acknowledge, but will generate a STOP  
condition.  
Selective/Random Read  
Selective/Random READ operations allow the  
Master device to select at random any memory  
location for a READ operation. The Master device  
first performs a ‘dummy’ write operation by sending  
the START condition, slave address and byte  
addresses of the location it wishes to read. After the  
CAT1026 and CAT1027 acknowledges, the Master  
device sends the START condition and the slave  
¯¯  
address again, this time with the R/W bit set to one.  
The CAT1026 and CAT1027 then responds with its  
acknowledge and sends the 8-bit byte requested.  
The master device does not send an acknowledge  
but will generate a STOP condition.  
Figure 11. Selective Read Timing  
S
T
A
R
T
S
T
A
R
T
S
T
O
P
BUS ACTIVITY:  
MASTER  
SLAVE  
ADDRESS  
BYTE  
ADDRESS (n)  
SLAVE  
ADDRESS  
SDA LINE  
S
S
P
A
C
K
A
C
K
A
C
K
N
O
DATA n  
A
C
K
Figure 12. Sequential Read Timing  
S
T
O
P
BUS ACTIVITY:  
MASTER  
SLAVE  
ADDRESS  
DATA n  
DATA n+1  
DATA n+2  
DATA n+x  
SDA LINE  
P
A
C
K
A
C
K
A
C
K
A
C
K
N
O
A
C
K
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
13  
Doc. No. MD-3010 Rev. P  
CAT1026, CAT1027  
PACKAGE OUTLINE DRAWINGS  
PDIP 8-Lead 300 mils (L)(1)(2)  
SYMBOL  
MIN  
NOM  
MAX  
A
A1  
A2  
b
5.33  
0.38  
2.92  
0.36  
1.14  
0.20  
9.02  
7.62  
3.30  
0.46  
4.95  
0.56  
1.78  
0.36  
10.16  
8.25  
b2  
c
1.52  
E1  
0.25  
D
9.27  
E
7.87  
e
2.54 BSC  
6.35  
E1  
eB  
L
6.10  
7.87  
2.92  
7.11  
10.92  
3.80  
PIN # 1  
IDENTIFICATION  
3.30  
D
TOP VIEW  
E
A2  
A1  
A
c
b2  
L
eB  
e
b
SIDE VIEW  
END VIEW  
Notes:  
(1) All dimensions are in millimeters.  
(2) Complies with JEDEC MS-001.  
Doc. No. MD-3010 Rev. P  
14  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
CAT1026, CAT1027  
(1)(2)  
SOIC 8-Lead 150 mils (W)  
SYMBOL  
MIN  
NOM  
MAX  
1.75  
0.25  
0.51  
0.25  
5.00  
6.20  
4.00  
A
A1  
b
1.35  
0.10  
0.33  
0.19  
4.80  
5.80  
3.80  
c
E1  
E
D
E
E1  
e
1.27 BSC  
h
0.25  
0.40  
0º  
0.50  
1.27  
8º  
L
PIN # 1  
IDENTIFICATION  
θ
TOP VIEW  
D
h
A1  
θ
A
c
e
b
L
SIDE VIEW  
END VIEW  
Notes:  
(1) All dimensions are in millimeters. Angles in degrees.  
(2) Complies with JEDEC MS-012.  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
15  
Doc. No. MD-3010 Rev. P  
CAT1026, CAT1027  
TSSOP 8-Lead (V) (1)(2)  
b
SYMBOL  
MIN  
NOM  
MAX  
1.20  
0.15  
1.05  
0.30  
0.20  
3.10  
6.50  
4.50  
A
A1  
A2  
b
0.05  
0.80  
0.19  
0.09  
2.90  
6.30  
4.30  
0.90  
c
D
3.00  
6.40  
E
E1  
E
E1  
e
4.40  
0.65 BSC  
1.00 REF  
0.60  
L
L1  
θ1  
0.50  
0°  
0.75  
8°  
e
TOP VIEW  
D
c
A2  
A1  
A
θ1  
L1  
L
SIDE VIEW  
END VIEW  
Notes:  
(1) All dimensions are in millimeters. Angles in degrees.  
(2) Complies with JEDEC MO-153  
Doc. No. MD-3010 Rev. P  
16  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
CAT1026, CAT1027  
MSOP 8-Lead (Z) (1)(2)  
SYMBOL  
MIN  
NOM  
MAX  
1.10  
0.15  
0.95  
0.38  
0.23  
3.10  
5.00  
3.10  
A
A1  
A2  
b
0.05  
0.75  
0.22  
0.13  
2.90  
4.80  
2.90  
0.10  
0.85  
c
D
3.00  
4.90  
E
E
E1  
E1  
e
3.00  
0.65 BSC  
0.60  
L
0.40  
0º  
0.80  
6º  
L1  
L2  
θ
0.95 REF  
0.25 BSC  
TOP VIEW  
D
A2  
A
DETAIL A  
A1  
e
b
c
SIDE VIEW  
END VIEW  
θ
L2  
L
L1  
DETAIL A  
Notes:  
(1) All dimensions are in millimeters. Angles in degrees.  
(2) Complies with JEDEC MO-187.  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
17  
Doc. No. MD-3010 Rev. P  
CAT1026, CAT1027  
TDFN 8-Pad 3 x 3 mm (ZD4) (1)(2)  
D
A
e
b
L
E
E2  
PIN#1 ID  
PIN#1 INDEX AREA  
A1  
D2  
TOP VIEW  
SIDE VIEW  
BOTTOM VIEW  
SYMBOL  
MIN  
NOM  
0.75  
MAX  
0.80  
0.05  
A
A
A1  
A3  
b
0.70  
0.00  
A3  
0.02  
A1  
0.20 REF  
0.30  
FRONT VIEW  
0.23  
2.90  
2.20  
2.90  
1.40  
0.37  
3.10  
2.50  
3.10  
1.80  
D
3.00  
D2  
E
3.00  
E2  
e
0.65TYP  
0.30  
L
0.20  
0.40  
Notes:  
(1) All dimensions are in millimeters. Angles in degrees.  
(2) Complies with JEDEC MO-229.  
Doc. No. MD-3010 Rev. P  
18  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
CAT1026, CAT1027  
EXAMPLE OF ORDERING INFORMATION(1)  
Prefix  
Device # Suffix  
CAT  
1026  
W
I
-30  
G
T3  
Temperature Range  
I = Industrial (-40ºC to 85ºC)  
Tape & Reel  
T: Tape & Reel  
3: 3,000/Reel  
Company ID  
Product  
Number  
1026: 2k  
1027: 2k  
Package  
Reset Threshold Voltage  
-45: 4.50 V – 4.75 V  
-42: 4.25 V – 4.50 V  
-30: 3.00 V – 3.15 V  
-28: 2.85 V – 3.00 V  
-25: 2.55 V – 2.70 V  
Lead Finish  
Blank: Matte-Tin  
G: NiPdAu  
L: PDIP  
W: SOIC  
Y: TSSOP  
Z: MSOP  
ZD4: TDFN 3 x 3 mm(5)  
ORDERING INFORMATION  
Orderable Part Number – CAT1026xx  
Orderable Part Number – CAT1027xx  
CAT1026LI-45-G  
CAT1026ZI-45-GT3  
CAT1027LI-45-G  
CAT1027ZI-45-GT3  
CAT1026LI-42-G  
CAT1026ZI-42-GT3  
CAT1026ZI-30-GT3  
CAT1026ZI-28-GT3  
CAT1026ZI-25-GT3  
CAT1026ZD4I-45T3*  
CAT1026ZD4I-42T3*  
CAT1026ZD4I-30T3*  
CAT1026ZD4I-28T3*  
CAT1026ZD4I-25T3*  
CAT1027LI-42-G  
CAT1027ZI-42-GT3  
CAT1027ZI-30-GT3  
CAT1027ZI-28-GT3  
CAT1027ZI-25-GT3  
CAT1027ZD4I-45T3*  
CAT1027ZD4I-42T3*  
CAT1027ZD4I-30T3*  
CAT1027ZD4I-28T3*  
CAT1027ZD4I-25T3*  
CAT1026LI-30-G  
CAT1027LI-30-G  
CAT1026LI-28-G  
CAT1027LI-28-G  
CAT1026LI-25-G  
CAT1027LI-25-G  
CAT1026WI-45-GT3  
CAT1026WI-42-GT3  
CAT1026WI-30-GT3  
CAT1026WI-28-GT3  
CAT1026WI-25-GT3  
CAT1026YI-45-GT3  
CAT1026YI-42-GT3  
CAT1026YI-30-GT3  
CAT1026YI-28-GT3  
CAT1026YI-25-GT3  
CAT1027WI-45-GT3  
CAT1027WI-42-GT3  
CAT1027WI-30-GT3  
CAT1027WI-28-GT3  
CAT1027WI-25-GT3  
CAT1027YI-45-GT3  
CAT1027YI-42-GT3  
CAT1027YI-30-GT3  
CAT1027YI-28-GT3  
CAT1027YI-25-GT3  
* Part number is not exactly the same as the “Example of Ordering Information” shown above. For part numbers marked with there is only  
*
one hyphen in the orderable part number, which is placed before the “Reset Threshold Voltage”.  
Notes:  
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).  
(2) The standard lead finish is NiPdAu.  
(3) The device used in the above example is a CAT1026WI-30-GT3 (SOIC, Industrial Temperature, 3.0 - 3.15 V, NiPdAu, Tape & Reel,  
3,000/Reel).  
(4) For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.  
(5) TDFN not available in NiPdAu (–G) version.  
© 2009 SCILLC. All rights reserved.  
Characteristics subject to change without notice  
19  
Doc. No. MD-3010 Rev. P  
CAT1026, CAT1027  
REVISION HISTORY  
Date  
Rev. Reason  
Added Green Package logo. Updated DC Operating Characteristic notes. Updated  
Reliability Characteristics notes  
9/25/2003  
F
Eliminated Automotive temperature range. Updated Ordering Information with “Green”  
package marking codes  
11/07/2003  
4/12/2004  
11/01/2004  
11/04/2004  
G
H
I
Eliminated data sheet designation. Updated Reel Ordering Information  
Changed SOIC package designators. Eliminated 8-pad TDFN (3 x 4.9 mm) package.  
Added package outlines  
J
Update Pin Configuration  
Update Feature  
Update Description  
Update DC Operating Characteristic  
Update AC Characteristics  
11/11/2004  
K
02/02/2007  
11/28/2007  
L
Update Example of Ordering Information  
Update Package Outline Drawings  
Update Example of Ordering Information  
Add “MD-“ to document number  
M
7-Nov-08  
05-Mar-09  
14-Jul-09  
N
O
P
Change logo and fine print to ON Semiconductor  
Update Ordering Information (Remove 2,000/Reel)  
Update Ordering Information table  
ON Semiconductor and  
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to  
any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability  
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.  
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All  
operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights  
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications  
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Doc. No. MD-3010, Rev. P  
20  
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Characteristics subject to change without notice  
配单直通车
CAT1027LI-25-G产品参数
型号:CAT1027LI-25-G
是否Rohs认证: 符合
生命周期:Transferred
IHS 制造商:CATALYST SEMICONDUCTOR INC
零件包装代码:DIP
包装说明:DIP,
针数:8
Reach Compliance Code:unknown
ECCN代码:EAR99
HTS代码:8542.39.00.01
风险等级:5.08
Is Samacsys:N
其他特性:RESET THRESHOLD VOLTAGE IS 2.625V
可调阈值:YES
模拟集成电路 - 其他类型:POWER SUPPLY MANAGEMENT CIRCUIT
JESD-30 代码:R-PDIP-T8
JESD-609代码:e4
长度:9.27 mm
信道数量:2
功能数量:1
端子数量:8
最高工作温度:85 °C
最低工作温度:-40 °C
封装主体材料:PLASTIC/EPOXY
封装代码:DIP
封装形状:RECTANGULAR
封装形式:IN-LINE
峰值回流温度(摄氏度):260
认证状态:Not Qualified
座面最大高度:5.33 mm
最大供电电压 (Vsup):5.5 V
最小供电电压 (Vsup):2.7 V
标称供电电压 (Vsup):3 V
表面贴装:NO
技术:CMOS
温度等级:INDUSTRIAL
端子面层:NICKEL PALLADIUM GOLD
端子形式:THROUGH-HOLE
端子节距:2.54 mm
端子位置:DUAL
处于峰值回流温度下的最长时间:40
宽度:7.62 mm
Base Number Matches:1
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