DS1314 参数 Datasheet PDF下载

DS1314

3V Nonvolatile Controller with Lithium

Battery Monitor

www.dalsemi.com

FEATURES

Converts CMOS SRAM into nonvolatile

memory

Unconditionally write-protects SRAM when

V

CC

is out of tolerance

Automatically switches to battery backup

supply when V

CC

power failure occurs

Monitors voltage of a lithium cell and

provides advanced warning of impending

battery failure

Signals low-battery condition on active low

Battery Warning output signal

Automatic V

CC

power-fail detection for 3.0V

or 3.3V power supplies

Space-saving 8-pin DIP and SOIC packages

Optional 16-pin SOIC and 20-pin TSSOP

versions reset processor when power failure

occurs and hold processor in reset during

system power-up

Industrial temperature range of -40°C to

+85°C

V

CCO

V

BAT

TOL

GND

PIN ASSIGNMENT

1

2

3

4

8

7

6

5

V

CCI

BW

CEO

CEI

V

CCO

V

BAT

TOL

GND

1

2

3

4

8

7

6

5

V

CCI

BW

CEO

CEI

DS1314 8-Pin DIP

(300-mil)

NC

V

CCO

NC

V

BAT

NC

TOL

NC

GND

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

NC

V

CCI

RST

NC

BW

CEO

NC

CEI

DS1314S-2 8-Pin SOIC

(150-mil)

NC

V

CCO

NC

V

BAT

NC

NC

TOL

NC

NC

GND

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

NC

V

CCI

RST

NC

NC

BW

NC

CEO

NC

CEI

DS1314S 16-Pin SOIC

(300-mil)

DS1314E 20-Pin TSSOP

PIN DESCRIPTION

V

CCI

V

CCO

V

BAT

CEI

CEO

TOL

BW

RST

GND

NC

- Power Supply Input

- SRAM Power Supply Output

- Backup Battery Input

- Chip Enable Input

- Chip Enable Output

- V

CC

Tolerance Select

- Battery Warning Output

(Open Drain)

- Reset Output (Open Drain)

- Ground

- No Connection

DESCRIPTION

The DS1314 Nonvolatile Controller with Battery Monitor is a CMOS circuit which solves the application

problem of converting CMOS RAM into nonvolatile memory. Incoming power is monitored for an out-

of-tolerance condition. When such a condition is detected, chip enable is inhibited to accomplish write

protection and the battery is switched on to supply the RAM with uninterrupted power. Special circuitry

uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery

consumption.

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