DS1744/DS1744P Y2K-Compliant, Nonvolatile Timekeeping RAMs
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
Address Setup Time
WE Pulse Width
CE Pulse Width
Data Setup Time
Data Hold Time
Data Hold Time
Address Hold Time
Address Hold Time
WE Data Off Time
Write Recovery Time
t
WC
t
AS
t
WEW
t
CEW
t
DS
t
DH1
t
DH2
t
AH1
t
AH2
t
WEZ
t
WR
70
0
50
60
30
0
0
5
5
25
5
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
8
9
8
9
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
Address Setup Time
WE Pulse Width
CE Pulse Width
CE and CE2 Pulse Width
Data Setup Time
Data Hold Time
Data Hold Time
Address Hold Time
Address Hold Time
WE Data Off Time
Write Recovery Time
t
WC
t
AS
t
WEW
t
CEW
t
CEW
t
DS
t
DH1
t
DH2
t
AH1
t
AH2
t
WEZ
t
WR
120
0
100
110
110
80
0
0
0
10
40
10
120
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
8
9
8
9
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DALLAS [ DALLAS SEMICONDUCTOR ]
