DS1554 Datasheet, PDF (10/21 Pages) Dallas Semiconductor – 256K NV Y2KC Timekeeping RAM

POWER-ON DEFAULT STATES
Upon application of power to the device, the following register bits are set to a 0:
WDS=0, BMB0-BMB4=0, RB0-RB1=0, AE=0, ABE=0.
DS1554
ABSOLUTE MAXIMUM RATINGS*
Voltage on Any Pin Relative to Ground
Operating Temperature
Storage Temperature
Soldering Temperature
-5.0V to +6.0V
0°C to 70°C
-55°C to +125°C
260°C for 10 seconds (See Note 8)
* 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.
RECOMMENDED DC OPERATING CONDITIONS
PARAMETER
SYMBOL MIN TYP
Logic 1 Voltage All Inputs
V_CC = 5V ±10%
V_IH
2.2
V_CC = 3.3V ±10%
V_IH
2.0
Logic 0 Voltage All Inputs
V_CC = 5V ±10%
V_IL
-0.3
V_CC = 3.3V ±10%
V_IL
-0.3
MAX
(0°C to 70°C)
UNITS NOTES
V_CC +0.3V
V
1
V_CC +0.3V
V
1
0.8
1
0.6
1
DC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL MIN
Active Supply Current
I_CC
TTL Standby Current ( CE =V_IH )
I_CC1
CMOS Standby Current
I_CC2
( CE ≥=V_CC - 0.2V)
Input Leakage Current (any input)
I_IL
-1
Output Leakage Current (any
output)
I_OL
-1
Output Logic 1 Voltage
(I_OUT = -1.0 mA)
V_OH
2.4
Output Logic 0 Voltage
(I_OUT = 2.1 mA, DQ0-7 Outputs)
V_OL1
(I_OUT = 10.0 mA, IRQ /FT and
V_OL2
RST outputs)
Write Protection Voltage
V_PF
4.25
Battery Switch Over Voltage
V_SO
(0°C to 70°C; V_CC = 5.0V ±=10%)
TYP MAX UNITS NOTES
X
75
mA
2, 3
X
6
mA
2, 3
X
4
mA
2, 3
+1
µA
+1
µA
V
1
0.4
V
1
0.4
V
1, 5
4.37 4.50
V
1
V_BAT
V
1, 4
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