DS1244 Maxim, DS1244 Datasheet - Page 10

• 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

DC ELECTRICAL CHARACTERISTICS
Input Leakage Current
I/O Leakage Current
Output Current at 2.4V
Output Current at 0.4V
Standby Current CE = 2.2V
Standby Current
Operating Current t
Write Protection Voltage
Battery Switchover Voltage
CAPACITANCE
Input Capacitance
Input/Output Capacitance
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
CE ≥ V
CE = V
OE
CE
OE
to Output Valid
to Output Valid
or
P ARAMETER
1 B
CE
IH
CC
P ARAMETER
2 B
PARAMETER
≤ V
to Output Active
- 0.5V
CC
CYC
WE
WE
WE
= 70ns
SYMBOL
I
I
I
SYMBOL
V
V
I
I
CCS1
CCS2
CC01
I
I
OH
OL
IO
IL
SO
PF
C
C
SYMBOL
I/O
IN
t
t
t
t
t
t
t
t
t
t
ODW
t
t
t
t
OEW
ACC
t
COE
WC
AW
WR
WP
CO
OD
OH
DH
RC
OE
DS
MIN
2.80
-1.0
-1.0
-1.0
2.0
MIN
10 of 20
M IN
1 0 B
V
70
70
50
30
5
5
0
0
5
5
D S1244Y-70
9 B
BAT
TYP
2.86
2.0
5
TYP
or V
5
5
PF
Over the operating range (3.3V)
M AX
1 1 B
Over the operating range (5V)
70
35
70
25
25
MAX
MAX
+1.0
+1.0
2.97
3.0
10
10
50
7
U NITS
3 B
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
UNITS
UNITS
mA
mA
mA
mA
mA
µA
µA
pF
pF
V
V
8 B
(T
A
N OTES
4 B
= +25°C)
NOTES
NOTES
5
5
3
5
5
4
4
12
11
11