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DS1258Y/AB
retain data. During power-up, when V CC rises above approximately 3.0V, the power switching circuit
connects external V CC to RAM and disconnects the lithium energy source. Normal RAM operation can
resume after V CC exceeds 4.75V for the DS1258AB and 4.5V for the DS1258Y.
FRESHNESS SEAL
The DS1258 devices are shipped from Dallas Semiconductor with the lithium energy sources
disconnected, guaranteeing full energy capacity. When V CC is first applied at a level greater than V TP , the
lithium energy source is enabled for battery backup operation.
ABSOLUTE MAXIMUM RATINGS*
Voltage on Any Pin Relative to Ground
Operating Temperature Range
Storage Temperature Range
Soldering Temperature
Caution: Do Not Reflow
-0.3V to +6.0V
0°C to +70°C, -40 ° C to +85 ° C for Industrial Parts
-40°C to +70°C, -40 ° C to +85 ° C for Industrial Parts
+260°C for 10 seconds
(Wave or Hand Solder Only)
* 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
(t A : See Note 10)
PARAMETER
DS1258AB Power Supply Voltage
DS1258Y Power Supply Voltage
Logic 1
Logic 0
SYMBOL
V CC
V CC
V IH
V IL
MIN
4.75
4.5
2.2
0.0
TYP
5.0
5.0
MAX
5.25
5.5
V CC
+0.8
UNITS
V
V
V
V
NOTES
DC ELECTRICAL
CHARACTERISTICS
(V CC = 5V ± 5% for DS1258AB)
(t A : See Note 10) (V CC = 5V ± 10% for DS1258Y)
PARAMETER
Input Leakage Current
I/O Leakage Current CEU = CEL 3 V IH
￡ V CC
SYMBOL
I IL
I IO
MIN
-2.0
-1.0
TYP
MAX
+2.0
+1.0
UNITS
m A
m A
NOTES
Output Current @ 2.4V
Output Current @ 0.4V
I OH
I OL
-1.0
2.0
mA
mA
Standby Current CEU , CEL =2.2V
Standby Current CEU , CEL =V CC - 0.5V
Operating Current
I CCS1
I CCS2
I CCO1
0.7
150
1.5
300
170
mA
m A
mA
Write Protection Voltage (DS1258AB)
Write Protection Voltage (DS1258Y)
V TP
V TP
4.50
4.25
4.62
4.37
4.75
4.5
V
V
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