Datasheet

DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
12 of 18
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 3.3V 10%, Over the Operating Range.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Active Supply Current I
CC
(Notes 2, 3, 11) 20 30 mA
TTL Standby Current
(CE = V
IH
)
I
CC1
(Notes 2, 3) 2 6 mA
CMOS Standby Current
(CE V
CC
- 0.2V)
I
CC2
(Notes 2, 3) 1 4 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) 2.75 2.97 V
Battery Switchover Voltage V
SO
(Notes 1,4)
V
BAT
or V
PF
V
Figure 5. Read Cycle Timing Diagram