DS1350Y/AB
4096k Nonvolatile SRAM
www.maxim-ic.com
FEATURES
PIN ASSIGNMENT
C 10 years minimum data retention in the
absence of external power
A18
A17
A14
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
1
2
3
BW
A15
A16
C
Data is automatically protected during power
loss
A13
A12
A11
A10
A9
4
5
6
7
8
9
RST
VCC
C Power supply monitor resets processor when
VCC power loss occurs and holds processor in
reset during VCC ramp-up
WE
OE
CE
A8
DQ7
DQ6
DQ5
DQ4
DQ3
A7
A6
A5
A4
A3
A2
A1
A0
10
11
12
13
14
15
16
17
C Battery monitor checks remaining capacity
daily
GND VBAT
DQ2
DQ1
DQ0
GND
C Read and write access times as fast as 70ns
C Unlimited write cycle endurance
C Typical standby current 50ꢀA
C Upgrade for 512k x 8 SRAM, EEPROM, or
Flash
34-Pin PowerCap Module (PCM)
C Lithium battery is electrically disconnected to
retain freshness until power is applied for the
first time
PIN DESCRIPTION
A0 – A18
DQ0 – DQ7
CE
WE
OE
RST
BW
- Address Inputs
- Data In/Data Out
- Chip Enable
- Write Enable
- Output Enable
- Reset Output
- Battery Warning
- Power (+5V)
- Ground
C Full M10% VCC operating range (DS1350Y)
or optional M5% VCC operating range
(DS1350AB)
C Optional industrial temperature range of
-40LC to +85LC, designated IND
C PowerCap Module (PCM) package
-
-
Directly surface-mountable module
Replaceable snap-on PowerCap provides
lithium backup battery
VCC
GND
-
-
Standardized pinout for all nonvolatile
(NV) SRAM products
Detachment feature on PowerCap allows
easy removal using a regular screwdriver
DESCRIPTION
The DS1350 4096k NV SRAMs are 4,194,304 bit, fully static, NV SRAMs organized as 524,288 words
by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry, which
constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium
energy source is automatically switched on and write protection is unconditionally enabled to prevent
data corruption. Additionally, the DS1350 devices have dedicated circuitry for monitoring the status of
VCC and the status of the internal lithium battery. DS1350 devices in the PowerCap Module package are
directly surface mountable and are normally paired with a DS9034PC PowerCap to form a complete NV
SRAM module. The devices can be used in place of 512k x 8 SRAM, EEPROM or Flash components.
1 of 12
110201