DS1251 Maxim, DS1251 Datasheet - Page 11

• 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

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
POWER-DOWN/POWER-UP TIMING
(T
CE at V
V
V
V
V
V
CE at V
(T
Expected Data Retention Time
Warning: Under no circumstances are negative undershoots of any amplitude allowed when device
is in battery-backup mode.
CC
PF(MIN)
CC
CC
PF(MIN)
A
A
A
= Over the operating range.) (5V)
= Over the operating range.) (3.3V)
Slew from V
Slew from V
Slew from V
= +25°C)
(CE at V
IH
IH
(CE at V
before Power-Down
after Power-Up
P ARAMETER
1 0 B
P ARAMETER
1 1 B
P ARAMETER
4 B
PF
PF
PF(MAX)
PF(MIN)
PF(MAX)
)
)
to V
to
to
SO
SYMBOL
SYMBOL
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
ODO
t
t
t
t
t
COE
OEE
RST
REC
WC
WP
WR
CW
t
RC
CO
OE
OD
RR
DH
t
DR
DS
PD
FB
F
R
11 of 20
MIN
MIN
MIN
300
10
1.5
65
10
65
55
10
30
60
65
10
5
5
0
0
0
TYP
TYP
TYP
MAX
MAX
MAX
2.5
55
55
25
25
UNITS
UNITS
UNITS
years
ms
µs
µs
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
NOTES
NOTES
10
5
5
3
4
4
9