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DS1211

Nonvolatile Controller X 8 Chip

Dallas Semiconductor -> Maxim Integrated 

www.dalsemi.com

DS1211

Nonvolatile Controller x 8 Chip

FEATURES

PIN ASSIGNMENT

Converts full CMOS RAMs into nonvolatile VBAT1 1

memories

20 VCCI

Unconditionally write protects when VCC is VCCO 2

out of tolerance

Automatically switches to battery when

power-fail occurs

TOL 3

PF 4

3 to 8 decoder provides control for up to eight CE7 5

CMOS RAMs

Consumes less than 100 nA of battery current

CE6

6

Tests battery condition on power-up

C7

19 VBAT2

18 CE

17 CE0

VBAT1 1

16 CE1

VCCO

2

15 CE2 TOL

3

PF

4

14 CE3 CE7

5

20 VCCI

19 VBAT2

18 CE

17 CE0

16 CE1

Provides for redundant batteries

Power-fail signal can be used to interrupt

processor on power failure

Optional 5% or 10% power-fail detection

Optional 20-pin SOIC surface mount package

Optional industrial temperature range of

-40°C to +85°C

B8

A9

GND 10

13 NC CE6

6

C

7

12 CE4

B

8

A

9

11 CE5 GND

10

15 CE2

14 CE3

13 NC

12 CE4

11 CE5

20-Pin DIP (300-mil)

See Mech. Drawings

Section

PIN DESCRIPTION

20-Pin SOIC (300-mil)

See Mech. Drawings

Section

A, B, C

- Address Inputs

CE

- Chip Enable Input

CE0 - CE7

GND

VBAT1

VBAT2

TOL

VCCI

VCC0

- Chip Enable Outputs

- Ground

- + Battery 1

- + Battery 2

- Power Supply Tolerance

- +5V Supply

- RAM Supply

PF

- Power-fail

NC

- No Connection

DESCRIPTION

The DS1211 Nonvolatile Controller x 8 Chip is a CMOS circuit which 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 RAMs with uninterrupted power. Special circuitry

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

consumption.

By combining the DS1211 nonvolatile controller/decoder chip and lithium batteries, nonvolatile RAM

operation can be achieved for up to eight CMOS memories.

See the data sheet for the DS1212 Nonvolatile Controller x 16 Chip for electrical specifications and

operation.

1 of 1

111899

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