DS1330W データシートの表示（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1330W

3.3V 256k Nonvolatile SRAM with Battery Monitor

Dallas Semiconductor -> Maxim Integrated 

www.maxim-ic.com

DS1330W

3.3V 256k 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 as fast as 100 ns

§ Unlimited write cycle endurance

§ Typical standby current 50 µA

§ Upgrade for 32k 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

NC

2

NC

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

NC

33

NC

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 PowerCap)

PIN DESCRIPTION

A0-A14

- 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 (+3.3V)

- Ground

NC

- No Connect

DESCRIPTION

The DS1330W 3.3V 256k Nonvolatile SRAM is a 262,144-bit, fully static, nonvolatile SRAM organized

as 32,768 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 DS1330W has dedicated circuitry for monitoring the status of

VCC and the status of the internal lithium battery. DS1330W 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 32k x 8 SRAM, EEPROM or Flash

components.

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