DS1245Y/AB
1024k Nonvolatile SRAM
www.maxim-ic.com
FEATURES
PIN ASSIGNMENT
§ 10 years minimum data retention in the
absence of external power
NC
A16
A14
A12
A7
VCC
A15
NC
WE
A13
A8
1
32
31
2
3
4
30
29
§ Data is automatically protected during power
loss
5
6
28
27
§ Replaces 128k x 8 volatile static RAM,
EEPROM or Flash memory
§ Unlimited write cycles
A6
A5
A4
A9
A11
OE
A10
CE
7
8
26
25
A3
9
24
23
§ Low-power CMOS
A2
10
A1
§ Read and write access times as fast as 70 ns
§ Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
§ Full ±10% VCC operating range (DS1245Y)
§ Optional ±5% VCC operating range
(DS1245AB)
§ Optional industrial temperature range of
-40°C to +85°C, designated IND
§ JEDEC standard 32-pin DIP package
§ PowerCap Module (PCM) package
11
12
22
21
DQ7
DQ6
DQ5
DQ4
DQ3
A0
13
14
15
16
20
19
DQ0
DQ1
DQ2
18
17
GND
32-PIN ENCAPSULATED PACKAGE
740 MIL EXTENDED
NC
34
33
32
31
30
29
28
27
26
25
24
23
22
NC
A15
A16
NC
1
2
3
NC
A14
A13
A12
A11
A10
A9
4
5
6
7
-
-
Directly surface-mountable module
Replaceable snap-on PowerCap provides
lithium backup battery
VCC
WE
OE
CE
8
A8
9
DQ7
DQ6
DQ5
DQ4
DQ3
A7
A6
A5
A4
A3
A2
A1
A0
10
11
-
-
Standardized pinout for all nonvolatile
SRAM products
Detachment feature on PowerCap allows
easy removal using a regular screwdriver
12
13
14
GND
VBAT
21
20
19
DQ2
DQ1
DQ0
GND
15
16
17
18
34-PIN POWERCAP MODULE (PCM)
(USES DS9034PC POWERCAP)
PIN DESCRIPTION
A0 - A16
DQ0 - DQ7
CE
- Address Inputs
- Data In/Data Out
- Chip Enable
- Write Enable
- Output Enable
- Power (+5V)
- Ground
WE
OE
VCC
GND
NC
- No Connect
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