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DS1744 Datasheet, PDF (10/18 Pages) Dallas Semiconductor – Y2K-Compliant, Nonvolatile Timekeeping RAMs
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DS1744/DS1744P Y2K-Compliant, Nonvolatile Timekeeping RAMs
AC CHARACTERISTICS—WRITE CYCLE (5V)
(VCC = 5.0V ±10%, TA = Over the operating range.)
PARAMETER
SYMBOL MIN TYP
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
tWC
70
tAS
0
tWEW
50
tCEW
60
tDS
30
tDH1
0
tDH2
0
tAH1
5
tAH2
5
tWEZ
tWR
5
MAX
25
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
8
9
8
9
AC CHARACTERISTICS—WRITE CYCLE (3.3V)
(VCC = 3.3V ±10%, TA = Over the operating range.)
PARAMETER
SYMBOL MIN
TYP
Write Cycle Time
tWC
120
Address Setup Time
tAS
0
WE Pulse Width
tWEW
100
CE Pulse Width
tCEW
110
CE and CE2 Pulse Width
tCEW
110
Data Setup Time
tDS
80
Data Hold Time
tDH1
0
Data Hold Time
tDH2
0
Address Hold Time
tAH1
0
Address Hold Time
tAH2
10
WE Data Off Time
tWEZ
Write Recovery Time
tWR
10
MAX
120
40
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
8
9
8
9
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