DS1244Y-120 DALLAS [Dallas Semiconductor], DS1244Y-120 Datasheet - Page 7

• Manufacturer Part Number: DS1244Y-120
• Description: 256K NV SRAM with Phantom Clock
• Manufacturer: DALLAS [Dallas Semiconductor]

PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS
POWER-DOWN/POWER-UP TIMING
WARNING:
Under no circumstances are negative undershoots, of any amplitude, allowed when device is in battery backup mode.
PARAMETER
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
RESET Pulse Width
CE High to Power–Fail
PARAMETER
CE at V
V
(CE at V
V
(CE at V
CE at V
PARAMETER
Expected Data Retention Time
CC
CC
Slew from 4.5V to 0V
Slew from 0V to 4.5V
IH
IH
IH
IH
before Power–Down
after Power–Up
)
)
SYMBOL
SYMBOL
SYMBOL
t
t
t
t
t
t
t
t
ODO
t
t
t
t
COE
OEE
t
t
t
REC
t
t
RST
t
t
WC
WP
WR
CW
RC
CO
OE
OD
RR
DH
DR
DS
PF
PD
t
t
R
F
MIN
MIN
MIN
120
120
100
100
200
300
10
10
20
20
40
10
10
0
0
TYP
TYP
TYP
(0 C to 70 C; V
MAX
MAX
MAX
100
100
40
40
0
2
UNITS
UNITS
UNITS
years
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
s
s
s
CC
= 4.5 to 5.5V)
(t
NOTES
NOTES
NOTES
A
032697 7/12
DS1244Y
= 25 C)
10
11
11
5
5
9