Datasheet

DS1554 256k, Nonvolatile, Y2K-Compliant Timekeeping RAM
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Figure 1. Block Diagram
Table 1. Operating Modes
V
CC
CE OE WE
DQ0–DQ7 MODE POWER
V
IH
X X High-Z Deselect Standby
V
IL
X V
IL
D
IN
Write Active
V
IL
V
IL
V
IH
D
OUT
Read Active
V
CC
> V
PF
V
IL
V
IH
V
IH
High-Z Read Active
V
SO
< V
CC
<V
PF
X X X High-Z Deselect CMOS Standby
V
CC
<V
SO
< V
PF
X X X High-Z Data Retention Battery Current
Maxim
DS1554