DS1350WP データシートの表示（PDF） - Maxim Integrated
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DS1350WP Datasheet PDF : 10 Pages
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19-5586; Rev 10/10
www.maxim-ic.com
DS1350W
3.3V 4096k Nonvolatile SRAM
with Battery Monitor
FEATURES
10 years minimum data retention in the
absence of external power
Data is automatically protected during power
loss
Power supply monitor resets processor when
VCC power loss occurs and holds processor in
reset during VCC ramp-up
Battery monitor checks remaining capacity
daily
Read and write access times of 100ns
Unlimited write cycle endurance
Typical standby current 50 µA
Upgrade for 512k x 8 SRAM, EEPROM or
Flash
Lithium battery is electrically disconnected to
retain freshness until power is applied for the
first time
Optional industrial temperature range of
-40°C to +85°C, designated IND
PowerCap Module (PCM) package
- Directly surface-mountable module
- Replaceable snap-on PowerCap provides
lithium backup battery
- Standardized pinout for all nonvolatile
SRAM products
- Detachment feature on PowerCap allows
easy removal using a regular screwdriver
PIN ASSIGNMENT
BW
1
A15
2
A16
3
RST
4
VCC
5
WE
6
OE
7
CE
8
DQ7
9
DQ6
10
DQ5
11
DQ4
12
DQ3
13
DQ2
14
DQ1
15
DQ0
16
GND
17
GND VBAT
34
A18
33
A17
32
A14
31
A13
30
A12
29
A11
28
A10
27
A9
26
A8
25
A7
24
A6
23
A5
22
A4
21
A3
20
A2
19
A1
18
A0
34-Pin PowerCap Module (PCM)
(Uses DS9034PC+ or DS9034PCI+ PowerCap)
PIN DESCRIPTION
A0-A18
- Address Inputs
DQ0-DQ7
- Data In/Data Out
CE
- Chip Enable
WE
- Write Enable
OE
- Output Enable
RST
- Reset Output
BW
- Battery Warning Output
VCC
GND
- Power (+3.3 Volts)
- Ground
NC
- No Connect
DESCRIPTION
The DS1350W 3.3V 4096k Nonvolatile SRAM is a 4,194,304-bit, fully static, nonvolatile SRAM
organized as 524,288 words by eight 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 DS1350W has dedicated circuitry
for monitoring the status of VCC and the status of the internal lithium battery. DS1350W devices in the
PowerCap Module package are directly surface mountable and are normally paired with a DS9034PC
PowerCap to form a complete Nonvolatile SRAM module. The devices can be used in place of 512k x 8
SRAM, EEPROM or Flash components.
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