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DS1345Y Datasheet(PDF) 1 Page - Dallas Semiconductor

Part # DS1345Y
Description  1024k Nonvolatile SRAM with Battery Monitor
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1345Y Datasheet(HTML) 1 Page - Dallas Semiconductor

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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 as fast as 70 ns
Unlimited write cycle endurance
Typical standby current 50
µA
Upgrade for 128k x 8 SRAM, EEPROM or
Flash
Lithium battery is electrically disconnected to
retain freshness until power is applied for the
first time
Full
±10% V
CC operating range (DS1345Y)
or optional
±5% V
CC operating range
(DS1345AB)
Optional industrial temperature range of
-40
°C to +85°C, designated IND
New 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
PIN DESCRIPTION
A0 - A16
- 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
- Power (+5V)
GND
- Ground
NC
- No Connect
DESCRIPTION
The DS1345 1024k Nonvolatile SRAMs are 1,048,576-bit, fully static, nonvolatile SRAMs organized as
131,072 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 DS1345 devices have dedicated circuitry for monitoring the
status of VCC and the status of the internal lithium battery. DS1345 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 128k x 8 SRAM, EEPROM or
Flash components.
DS1345Y/AB
1024k Nonvolatile SRAM
with Battery Monitor
www.dalsemi.com
1
BW
2
3
A15
A16
RST
VCC
WE
OE
CE
DQ7
DQ6
DQ5
DQ4
DQ3
DQ2
DQ1
DQ0
GND
4
5
6
7
8
9
10
11
12
13
14
15
16
17
NC
A14
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
A13
A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
34
NC
GND
VBAT
34-Pin POWERCAP MODULE (PCM)
(USES DS9034PC POWERCAP)


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