DS1556 Datasheet, PDF (10/20 Pages) Dallas Semiconductor – 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM

DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground……………………..………………………………………-0.3V to +6.0V
Storage Temperature Range………………………………………………………………………………...-40°C to +85°C
Soldering Temperature………………………………………………….See IPC/JEDEC Standard J-STD-020A (Note 8)
for Surface-Mount Devices
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
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
(Over the Operating Range)
PARAMETER
SYMBOL CONDITIONS MIN
Logic 1 Voltage All Inputs
(Note 1)
V_IH
V_CC = 5V ±10%
2.2
V_IH
V_CC = 3.3V ±10%
2.0
Logic 0 Voltage All Inputs
(Note 1)
V_IL
V_CC = 5V ±10%
-0.3
V_IL
V_CC = 3.3V ±10% -0.3
TYP
MAX
V_CC +
0.3V
V_CC +
0.3V
+0.8
+0.6
UNITS
V
V
DC ELECTRICAL CHARACTERISTICS
(V_CC = 5.0V ±10%, Over the Operating Range.)
PARAMETER
SYMBOL CONDITIONS
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 = -1.0 mA)
Output Logic 0 Voltage
I_CC
I_CC1
I_CC2
I_IL
I_OL
V_OH
V_OL1
V_OL2
(Notes 2, 3)
(Notes 2, 3)
(Notes 2, 3)
(Note 1)
I_OUT = 2.1 mA,
DQ0–7 Outputs
(Note 1)
I_OUT = 7.0 mA,
IRQ/FT, and RST
Outputs
(Notes 1, 5)
Write Protection Voltage
V_PF
(Note 1)
Battery Switchover Voltage
V_SO
(Notes 1,4)
MIN
-1
-1
2.4
4.20
TYP
30
4
2
MAX
85
6
UNITS
mA
mA
6
mA
+1
mA
+1
mA
V
0.4
V
0.4
V
4.50
V
V_BAT
V
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