Datasheet

DS1747/DS1747P Y2K-Compliant, Nonvolatile Timekeeping RAMs
11 of 16
AC CHARACTERISTICS—WRITE CYCLE (5V)
(V
CC
= 5.0V ±10%, T
A
= Over the Operating Range.)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Write Cycle Time t
WC
70 ns
Address Setup Time t
AS
0 ns
WE
Pulse Width
t
WEW
50 ns
CE
Pulse Width
t
CEW
60 ns
Data Setup Time t
DS
30 ns
Data Hold Time t
DH1
0 ns 8
Data Hold Time t
DH2
0 ns 9
Address Hold Time t
AH1
5 ns 8
Address Hold Time t
AH2
5 ns 9
WE
Data Off Time
t
WEZ
25 ns
Write Recovery Time t
WR
5 ns
AC CHARACTERISTICS—WRITE CYCLE (3.3V)
(V
CC
= 3.3V ±10%, T
A
= Over the Operating Range.)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Write Cycle Time t
WC
120 ns
Address Setup Time t
AS
0 120 ns
WE
Pulse Width
t
WEW
100 ns
CE
Pulse Width
t
CEW
110 ns
Data Setup Time t
DS
80 ns
Data Hold Time t
DH1
0 ns 8
Data Hold Time t
DH2
0 ns 9
Address Hold Time t
AH1
0 ns 8
Address Hold Time t
AH2
10 ns 9
WE
Data Off Time
t
WEZ
40 ns
Write Recovery Time t
WR
10 ns