DS1557 4Meg, Nonvolatile, Y2K-Compliant Timekeeping RAM
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ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground………………………………………………………………-0.3V to +6.0V
Storage Temperature Range…………...………………………………………………………….....……..-55°C to +125°C
Lead Temperature (soldering, 10s).....................................................................................................…………+260°C
Soldering Temperature (reflow)………………………………………………………………………………………. +260°C
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
OPERATING RANGE
RANGE TEMP RANGE V
CC
Commercial 0°C to +70°C
3.3V 10% or 5V 10%
Industrial -40°C to +85°C
3.3V 10% or 5V 10%
RECOMMENDED DC OPERATING CONDITIONS
(T
A
= Over the Operating Range)
PARAMETER SYMBOL
CONDITIONS
MIN TYP MAX UNITS
V
IH
V
CC
= 5V 10%
2.2
V
CC
+
0.3V
V
Logic 1 Voltage All Inputs
(Note 1)
V
IH
V
CC
= 3.3V 10%
2.0
V
CC
+
0.3V
V
V
IL
V
CC
= 5V 10%
-0.3 +0.8
Logic 0 Voltage All Inputs
(Note 1)
V
IL
V
CC
= 3.3V 10%
-0.3 +0.6
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 5.0V ±10%, T
A
= Over the Operating Range.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Active Supply Current I
CC
(Notes 2, 3, 11) 45 90 mA
TTL Standby Current
(CE = V
IH
)
I
CC1
(Notes 2, 3) 3 6 mA
CMOS Standby Current
(CE V
CC
- 0.2V)
I
CC2
(Notes 2, 3) 2 6 mA
Input Leakage Current
(Any Input)
I
IL
-1 +1
A
Output Leakage Current
(Any Output)
I
OL
-1 +1
A
Output Logic 1 Voltage
(I
OUT
= -1.0 mA)
V
OH
(Note 1) 2.4 V
V
OL1
I
OUT
= 2.1 mA,
DQ0–7 Outputs
(Note 1)
0.4 V
Output Logic 0 Voltage
V
OL2
I
OUT
= 7.0 mA,
IRQ/FT, and RST
Outputs
(Notes 1, 5)
0.4 V
Write Protection Voltage V
PF
(Note 1) 4.20 4.50 V
Battery Switchover Voltage V
SO
(Notes 1, 4) V
BAT
V
