DS1244 Maxim, DS1244 Datasheet - Page 12

• Manufacturer Part Number: DS1244
• Description: The DS1244 256k NV SRAM with a Phantom clock is a fully static nonvolatile RAM (NV SRAM) (organized as 32k words by 8 bits) with a built-in real-time clock
• Manufacturer: Maxim

MEMORY AC ELECTRICAL CHARACTERISTICS
Read Cycle Time
Access Time
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
Output Active from
Data Setup Time
Data Hold Time from
PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS
Read Cycle Time
Read Recovery
Write Cycle Time
Write Pulse Width
Write Recovery
Data Setup Time
Data Hold Time
OE
CE
OE
CE
OE
CE
OE
CE
OE
CE
RESET
to Output Valid
to Output Valid
or
Access Time
Access Time
to Output Low-Z
to Output Low-Z
to Output High-Z
to Output High-Z
Pulse Width
CE
Pulse Width
P ARAMETER
1 5 B
PARAMETER
to Output Active
WE
WE
WE
SYMBOL
t
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
ODO
t
t
COE
OEE
RST
WC
WR
CW
WP
RC
CO
OE
OD
RR
DH
DS
t
t
t
t
t
t
t
t
ODW
t
t
t
t
t
OEW
t
t
ACC
COE
AW
WC
WP
WR
CO
OD
OH
DH
RC
OE
DS
MIN
120
120
100
105
120
12 of 20
20
20
45
5
5
0
MIN
120
120
90
20
50
20
DS1244W-120
5
5
0
5
TYP
M AX
1 4 B
120
120
Over the operating range (3.3V)
60
40
40
Over the operating range (3.3V)
MAX
100
100
40
40
UNITS
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
NOTES
NOTES
10
5
5
3
5
5
4
4
10
5
5
3
4
4