Datasheet

DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
13 of 18
AC CHARACTERISTICS—READ CYCLE
(Over the Operating Range)
V
CC
= 5.0V 10% V
CC
= 3.3V 10%
PARAMETER SYMBOL
MIN MAX MIN MAX
UNITS
Read Cycle Time t
RC
70 120 ns
Address Access Time t
AA
70 120 ns
CE to DQ Low-Z
t
CEL
5 5 ns
CE Access Time
t
CEA
70 120 ns
CE Data Off Time
t
CEZ
25 40 ns
OE to DQ Low-Z
t
OEL
5 5 ns
OE Access Time
t
OEA
35 100 ns
OE Data Off Time
t
OEZ
25 35 ns
Output Hold from Address t
OH
5 5 ns
AC CHARACTERISTICS—WRITE CYCLE
(Over the Operating Range)
V
CC
= 5.0V 10% V
CC
= 3.3V 10%
PARAMETER SYMBOL
MIN MAX MIN MAX
UNITS
Write Cycle Time t
WC
70 120 ns
Address Access Time t
AS
0 0 ns
WE Pulse Width
t
WEW
50 100 ns
CE Pulse Width
t
CEW
60 110 ns
Data Setup Time t
DS
30 80 ns
Data Hold Time (Note 9) t
DH1
5 5 ns
Data Hold Time (Note 10) t
DH2
5 5 ns
Address Hold Time (Note 9) t
AH1
5 0 ns
Address Hold Time
(Note 10)
t
AH2
5 5 ns
WE Data Off Time
t
WEZ
25 40 ns
Write Recovery Time t
WR
5 10 ns