DS1744/DS1744P Y2K-Compliant, Nonvolatile Timekeeping RAMs
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground……………………..………………………………………..-0.3V to +6.0V
Operating Temperature Range……………………………………...………………………………………...-40°C to +85°C
Storage Temperature Range…………………………………………………………………………………..-40°C to +85°C
Soldering Temperature…………………………………………….See IPC/JEDEC J-STD-020A (DIP Package) (Note 7)
This is a stress rating only and functional operation of the device at these or any other condition beyond those indicated in the
operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of
time can affect reliability.
OPERATING RANGE
RANGE
Commercial
Industrial
TEMP RANGE
0°C to +70°C
-40°C to +85°C
V
CC
3.3V
±
10% or 5V
±
10%
3.3V
±
10% or 5V
±
10%
RECOMMENDED DC OPERATING CONDITIONS
(T
A
= Over the operating range)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Logic 1 Voltage (All Inputs)
V
CC
= 5V
±
10%
V
CC
= 3.3V
±
10%
Logic 0 Voltage (All Inputs)
V
CC
= 5V
±
10%
V
CC
= 3.3V
±
10%
V
IH
V
IH
V
IL
V
IL
2.2
2.0
-0.3
0.3
V
CC
+ 0.3V
V
CC
+ 0.3V
0.8
0.6
V
V
V
V
1
1
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 5.0V
±10%,
T
A
= Over the operating range.)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
Active Supply Current
TTL Standby Current
( CE = V
IH
)
CMOS Standby Current
( CE
³
V
CC
- 0.2V)
Input Leakage Current (Any
Input)
Output Leakage Current
(Any Output)
Output Logic 1 Voltage
(I
OUT
= -1.0mA)
Output Logic 0 Voltage
(I
OUT
= +2.1mA)
Write Protection Voltage
Battery Switchover Voltage
I
CC
I
CC1
Icc
2
I
IL
I
OL
V
OH
V
OL
V
PF
V
SO
4.25
V
BAT
-1
-1
2.4
75
6
4
+1
+1
mA
mA
mA
m
A
m
A
2, 3
2, 3
2, 3
1
0.4
4.50
V
1
1
1, 4
7 of 18
DALLAS [ DALLAS SEMICONDUCTOR ]
