24LC21A
TABLE 1-2:
AC CHARACTERISTICS
Symbol
F
CLK
T
HIGH
T
LOW
T
R
T
F
T
HD
:
STA
T
SU
:
STA
T
HD
:
DAT
T
SU
:
DAT
T
SU
:
STO
T
AA
T
BUF
Vcc= 2.5-5.5V
Standard Mode
Min
Clock frequency
Clock high time
Clock low time
SDA and SCL rise time
SDA and SCL fall time
Start condition hold time
Start condition setup time
Data input hold time
Data input setup time
Stop condition setup time
Output valid from clock
Bus free time
—
4000
4700
—
—
4000
4700
0
250
4000
—
4700
Max
100
—
—
1000
300
—
—
—
—
—
3500
—
Vcc= 4.5 - 5.5V
Fast Mode
Min
—
600
1300
—
—
600
600
0
100
600
—
1300
Max
400
—
—
300
300
—
—
—
—
—
900
—
kHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Units
Remarks
Parameter
After this period the first clock
pulse is generated
Only relevant for repeated
Start condition
T
OF
Output fall time from V
IH
minimum to V
IL
maximum
Input filter spike suppres- T
SP
sion (SDA and SCL pins)
Write cycle time
T
WR
Transmit-Only Mode Parameters
Output valid from VCLK
T
VAA
VCLK high time
T
VHIGH
VCLK low time
T
VLOW
VCLK setup time
T
VHST
VCLK hold time
T
SPVL
Mode transition time
T
VHZ
Transmit-only power-up
T
VPU
time
Input filter spike suppres- T
SPV
sion (VCLK pin)
Endurance
—
Note 1:
2:
3:
4:
—
—
—
—
4000
4700
0
4000
—
0
—
1M
250
50
10
2000
—
—
—
—
1000
—
100
—
20 + 0.1
C
B
—
—
—
600
1300
0
600
—
0
—
1M
250
50
10
1000
—
—
—
—
500
—
100
—
ns
ns
ms
ns
ns
ns
ns
ns
ns
ns
ns
cycles
Time the bus must be free
before a new transmission
can start
C
B
≤
100 pF
Byte or Page mode
25°C, Vcc = 5.0V, Block
mode
Not 100% tested. C
B
= Total capacitance of one bus line in pF.
As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
The combined T
SP
and V
HYS
specifications are due to Schmitt Trigger inputs which provide noise and
spike suppression. This eliminates the need for a T
I
specification for standard operation.
This parameter is not tested but ensured by characterization. For endurance estimates in a specific
application, please consult the Total Endurance™ Model which can be obtained from our web site.
2003 Microchip Technology Inc.
DS21160F-page 3
MICROCHIP [ MICROCHIP TECHNOLOGY ]
