DS1254 查看數據表（PDF） - Maxim Integrated
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DS1254 Datasheet PDF : 17 Pages
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DS1254
AC ELECTRICAL CHARACTERISTICS
(VCC = 3.3V 10%, TA = 0C to +70C.)
PARAMETER
SYMBOL
MIN
Read Cycle Time
tRC
150
Address Access Time
OE to Output Valid
CE to Output Valid
CE or OE to Output Active
tAAC
tOE
tCO
tCOE
0
Output High-Z from Deselection
tOD
Output Hold from Address Change
tOH
5
Write Cycle Time
WE, CE Pulse Width
tWC
150
tWP
100
Address Setup Time
tAW
10
Address Hold Time
Output High-Z from WE
Output Active from WE
tAH1
5
tAH2
25
tODW
tOEW
5
Data Setup Time
tDS
60
Data Hold Time
tDH1
0
tDH2
20
Read Recovery (Clock Access Only)
tRR
20
Write Recovery (Clock Access Only)
tWR
20
MAX
150
75
150
70
70
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
2
2
5
6
7
2
2
8
6
8
POWER-UP/POWER-DOWN CHARACTERISTICS
(VCC = 3.3V 10%)
PARAMETER
CE and WE at VIH Before Power-Down
VCC Fall Time: VPF(MAX) to VPF(MIN)
VCC Fall Time: VPF(MIN) to VBAT
VCC Rise Time: 0V to VPF(MIN)
VCC Valid to End of Write Protection
VCC Valid to BW Valid
SYMBOL
tPD
tF
tFB
tR
tREC
tBPU
MIN TYP MAX UNITS NOTES
0
s
300
s
10
s
150
s
125
ms
1
s
3
(TA = +25C)
PARAMETER
Expected Data-Retention Time (Oscillator On)
SYMBOL
tDR
MIN TYP MAX UNITS NOTES
10
years
4
WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when
device is in battery-backup mode.
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