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DS1212

Nonvolatile Controller x 16 Chip

www.dalsemi.com

FEATURES

Converts full CMOS RAM into nonvolatile

memory

Unconditionally write protects when V

CC

is

out of tolerance

Automatically switches to battery when

power-fail occurs

4 to 16 decoder provides control for up to 16

CMOS RAMs

Consumes less than 100 nA of battery

current

Tests battery condition on power-up

Provides for redundant batteries

Power fail signal can be used to interrupt

processor on power failure

Optional 5% or 10% power-fail detection

Optional 28-pin PLCC surface mount

package

Optional industrial temperature range of

-40擄C to +85擄C

PIN ASSIGNMENT

VBAT1

VCCO

TOL

PF

CE15

CE14

CE13

CE12

CE11

D

C

B

A

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

VCCI

VBAT2

CE

CE0

CE1

CE2

CE3

CE4

CE5

CE6

CE7

CE8

CE9

CE10

28-Pin DIP (600-mil)

See Mech. Drawings Section

PF

TOL

VCCO

VBAT1

VCCI

VBAT2

CE

4

3

2

1

28

27

26

25

24

23

22

21

20

19

12

13

14

15

16

17

18

PIN DESCRIPTION

A, B, C, D

CE

CE0

-

CE15

GND

V

BAT1

V

BAT2

TOL

V

CCI

V

CCO

PF

- Address Inputs

- Chip Enable

- Chip Enable Outputs

- Ground

- + Battery 1

- + Battery 2

- Power Supply Tolerance

- +5V Supply

- RAM Supply

- Power Fail

CE15

CE14

CE13

CE12

CE11

D

C

5

6

7

8

9

10

11

CE0

CE1

CE2

CE3

CE4

CE5

CE6

28-Pin PLCC

See Mech. Drawings Section

DESCRIPTION

The DS1212 Nonvolatile Controller x16 Chip is a CMOS circuit that solves the application problem of

converting CMOS RAMs into nonvolatile memories. Incoming power is monitored for an out-of-

tolerance condition. When such a condition is detected, the chip enables are inhibited to accomplish write

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

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

consumption.

1 of 7

111899

B

A

GND

CE10

CE9

CE8

CE7

next

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