
DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
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AC CHARACTERISTICS—READ CYCLE
(Over the Operating Range)
VCC = 5.0V 10%
VCC = 3.3V 10%
PARAMETER
SYMBOL
MIN
MAX
MIN
MAX
UNITS
Read Cycle Time
tRC
70
120
ns
Address Access Time
tAA
70
120
ns
CE to DQ Low-Z
tCEL
5
ns
CE Access Time
tCEA
70
120
ns
CE Data Off Time
tCEZ
25
40
ns
OE to DQ Low-Z
tOEL
5
ns
OE Access Time
tOEA
35
100
ns
OE Data Off Time
tOEZ
25
35
ns
Output Hold from Address
tOH
5
ns
AC CHARACTERISTICS—WRITE CYCLE
(Over the Operating Range)
VCC = 5.0V 10%
VCC = 3.3V 10%
PARAMETER
SYMBOL
MIN
MAX
MIN
MAX
UNITS
Write Cycle Time
tWC
70
120
ns
Address Access Time
tAS
0
ns
WE Pulse Width
tWEW
50
100
ns
CE Pulse Width
tCEW
60
110
ns
Data Setup Time
tDS
30
80
ns
Data Hold Time (Note 9)
tDH1
5
ns
Data Hold Time (Note 10)
tDH2
5
ns
Address Hold Time (Note 9)
tAH1
5
0
ns
Address Hold Time
(Note 10)
tAH2
5
ns
WE Data Off Time
tWEZ
25
40
ns
Write Recovery Time
tWR
5
10
ns