DS1243 Maxim, DS1243 Datasheet - Page 9

• Manufacturer Part Number: DS1243
• Description: The DS1243Y 64K NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 8192 words by 8 bits) with a built-in real time clock
• Manufacturer: Maxim

PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS
(V
Read Cycle Time
Read Recovery
Write Cycle Time
Write Pulse Width
Write Recovery
Data Setup Time
Data Hold Time
POWER-DOWN/POWER-UP TIMING
V
V
(T
Expected Data-Retention Time
WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when
device is in battery-backup mode.
CE
OE
CE
OE
CE
OE
CE
RESET
CE
CE
CE
CC
CC
A
CC
Access Time
Access Time
to Output Low-Z
to Output Low-Z
to Output High-Z
to Output High-Z
Pulse Width
High to Power-Fail
at V
Slew from 4.5V to 0V (
Slew from 0V to 4.5V (
at V
= +25°C)
= 4.5V to 5.5V, T
Pulse Width
IH
IH
before Power-Down
after Power-Up
PARAMETER
PARAMETER
PARAMETER
A
= 0°C to +70°C.)
CE
CE
at V
at V
IH
IH
)
)
SYMBOL
SYMBOL
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
ODO
t
t
t
COE
OEE
RST
t
REC
WC
WP
WR
CW
t
DR
RC
CO
OE
OD
RR
DH
t
DS
PD
PF
F
R
9 of 14
MIN
MIN
MIN
120
120
100
100
200
300
10
10
10
20
20
40
10
0
0
TYP
TYP
TYP
MAX
MAX
MAX
100
100
40
40
0
2
UNITS
UNITS
UNITS
years
ms
µs
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
NOTES
NOTES
NOTES
10
11
11
9
5
5