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DS1557 4Meg, Nonvolatile, Y2K-Compliant Timekeeping RAM
10 of 17
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
VCC
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
(TA = Over the Operating Range)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
VIH
VCC = 5V 10%
2.2
VCC +
0.3V
V
Logic 1 Voltage All Inputs
(Note 1)
VIH
VCC = 3.3V 10%
2.0
VCC +
0.3V
V
VIL
VCC = 5V 10%
-0.3
+0.8
Logic 0 Voltage All Inputs
(Note 1)
VIL
VCC = 3.3V 10%
-0.3
+0.6
DC ELECTRICAL CHARACTERISTICS
(VCC = 5.0V ±10%, TA = Over the Operating Range.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Active Supply Current
ICC
(Notes 2, 3, 11)
45
90
mA
TTL Standby Current
(
CE = V
IH)
ICC1
(Notes 2, 3)
3
6
mA
CMOS Standby Current
(
CE
V
CC - 0.2V)
ICC2
(Notes 2, 3)
2
6
mA
Input Leakage Current
(Any Input)
IIL
-1
+1
A
Output Leakage Current
(Any Output)
IOL
-1
+1
A
Output Logic 1 Voltage
(IOUT = -1.0 mA)
VOH
(Note 1)
2.4
V
VOL1
IOUT = 2.1 mA,
DQ0–7 Outputs
(Note 1)
0.4
V
Output Logic 0 Voltage
VOL2
IOUT = 7.0 mA,
IRQ/FT, and RST
Outputs
(Notes 1, 5)
0.4
V
Write Protection Voltage
VPF
(Note 1)
4.20
4.50
V
Battery Switchover Voltage
VSO
(Notes 1, 4)
VBAT
V
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