DS1251 Maxim, DS1251 Datasheet - Page 12

• Manufacturer Part Number: DS1251
• Description: The DS1251 4096K NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 512K words by 8 bits) with a built-in real-time clock
• Manufacturer: Maxim

MEMORY AC ELECTRICAL CHARACTERISTICS
(T
Read Cycle Time
Access Time
OE to Output Valid
CE to Output Valid
OE or CE to Output Active
Output High-Z from Deselection
Output Hold from Address Change
Write Cycle Time
Write Pulse Width
Address Setup Time
Write Recovery Time
Output High-Z from WE
Output Active from WE
Data Setup Time
Data Hold Time from WE
PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS
(T
Read Cycle Time
CE Access Time
OE Access Time
CE to Output Low-Z
OE to Output Low-Z
CE to Output High-Z
OE to Output High-Z
Read Recovery
Write Cycle Time
Write Pulse Width
Write Recovery
Data Setup Time
Data Hold Time
CE Pulse Width
RST Pulse Width
A
A
= Over the operating range.) (3.3V)
= Over the operating range.) (3.3V)
PARAMETER
PARAMETER
S YMBOL
1 2 B
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
ODW
t
t
t
t
t
t
t
OEW
t
t
t
t
ODO
t
t
ACC
COE
COE
OEE
RST
WC
WP
AW
WR
WC
WP
WR
CW
RC
OE
CO
OD
OH
DH
RC
CO
OE
OD
RR
DH
DS
DS
12 of 20
MIN
120
120
100
105
120
20
20
45
5
5
0
MIN
120
120
D S1251W-120
1 3 B
90
20
50
20
5
5
0
5
TYP
M AX
1 6 B
120
120
60
40
40
MAX
100
100
40
40
U NITS
1 4 B
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
N OTES
1 5 B
NOTES
10
5
5
3
5
5
4
4
10
5
5
3
4
4