DS1251 Datasheet, PDF (12/22 Pages) Dallas Semiconductor – 4096k NV SRAM with Phantom Clock

DS1251/DS1251P
MEMORY AC ELECTRICAL CHARACTERISTICS
Over the operating range (3.3V)
PARAMETER
SYMBOL
DS1251W-120
MIN MAX
UNITS
NOTES
Read Cycle Time
Access Time
t_RC
120
ns
t_ACC
120
ns
OE to Output Valid
t_OE
60
ns
CE to Output Valid
t_CO
120
ns
OE or CE to Output Active
t_COE
5
ns
5
Output High-Z from Deselection
Output Hold from Address Change
Write Cycle Time
Write Pulse Width
Address Setup Time
Write Recovery Time
t_OD
40
ns
5
t_OH
5
ns
t_WC
120
ns
t_WP
90
ns
3
t_AW
0
ns
t_WR
20
ns
10
Output High-Z from WE
t_ODW
40
ns
5
Output Active from WE
t_OEW
5
ns
5
Data Setup Time
t_DS
50
ns
4
Data Hold Time from WE
t_DH
20
ns
4
PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS
Over the operating range (3.3V)
PARAMETER
SYMBOL MIN TYP MAX UNITS NOTES
Read Cycle Time
t_RC
120
ns
CE Access Time
t_CO
100
ns
OE Access Time
t_OE
100
ns
CE to Output Low-Z
t_COE
5
ns
OE to Output Low-Z
t_OEE
5
ns
CE to Output High-Z
t_OD
40
ns
5
OE to Output High-Z
t_ODO
40
ns
5
Read Recovery
Write Cycle Time
Write Pulse Width
Write Recovery
Data Setup Time
Data Hold Time
t_RR
20
t_WC
120
t_WP
100
t_WR
20
t_DS
45
t_DH
0
ns
ns
ns
3
ns
10
ns
4
ns
4
CE Pulse Width
t_CW
105
ns
RESET Pulse Width
t_RST
120
ns
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