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_______________General Description

The MXD1210 nonvolatile RAM controller is a very low-

power CMOS circuit that converts standard (volatile)

CMOS RAM into nonvolatile memory. It also continually

monitors the power supply to provide RAM write protec-

tion when power to the RAM is in a marginal (out-of-

tolerance) condition. When the power supply begins to

fail, the RAM is write protected, and the device switch-

es to battery-backup mode.

Applications

µP Systems

Computers

Embedded Systems

____________________________Features

o Battery Backup

o Memory Write Protection

o 230µA Operating-Mode Quiescent Current

o 2nA Backup-Mode Quiescent Current

o Battery Freshness Seal

o Optional Redundant Battery

o 5% or 10% Power-Fail Detection Options

o Tests Battery Condition During Power-Up

o 8-Pin SO Available

______________Ordering Information

*Contact factory for dice specifications.

Nonvolatile RAM Controller

________________________________________________________________

Maxim Integrated Products

1

FROM

DECODER

CE

1

2

7

6

3

4

5

8

VBATT1

VBATT2

GND

CE

CMOS

RAM

MXD1210

+5V

__________Typical Operating Circuit

1

2

3

4

8

7

6

5

VBATT2

CEO

CE

GND

TOL

VBATT1

MXD1210

DIP/SO

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

N.C.

N.C.

VBATT2

VBATT1

N.C.

N.C.

MXD1210

N.C.

CEO

N.C.

CE

GND

N.C.

TOL

N.C.

Wide SO

TOP VIEW

19-0154; Rev 1; 3/96

PART

TEMP. RANGE

PIN-PACKAGE

MXD1210CPA

8 Plastic DIP

MXD1210CSA

8 SO

MXD1210CWE

0°C to +70°C

16 Wide SO

0°C to +70°C

0°C to +70°C

MXD1210C/D

Dice*

MXD1210ESA

-40°C to +85°C

8 SO

MXD1210EPA

-40°C to +85°C

8 Plastic DIP

MXD1210EWE

-40°C to +85°C

16 Wide SO

MXD1210MJA

-55°C to +125°C

8 CERDIP

0°C to +70°C

_________________Pin Configurations