© SUMMIT MICROELECTRONICS, Inc. 2001 • 300 Orchard City Drive, Suite 131 • Campbell, CA 95008 • Telephone 408-378-6461 • Fax 408-378-6586 • www.summitmicro.com

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S93WD462/S93WD463

Characteristics subject to change without notice

Precision Supply-Voltage Monitor and Reset Controller

With a Watchdog Timer and 1k-bit Microwire Memory

SUMMIT

MICROELECTRONICS, Inc.

2029 2.2 1/23/01

FEATURES

•

Precision Monitor & RESET Controller

— RESET and RESET Outputs

— 150ms Reset Pulse Width

— Internal 1.26V Reference with ±1% Accuracy

— ZERO External Components Required

•

Watchdog Timer

— Nominal 1.6 Second Time-out Period

— Reset by Any Transition of CS

•

Memory

— 1K-bit Microwire Memory

— S93WD462

– Internally Ties ORG Low

– 100% Compatible With all 8-bit

Implementations

– Sixteen Byte Page Write Capability

— S93WD463

– Internally Ties ORG High

– 100% Compatible With all 16-bit

Implementations

– Eight Word Page Write Capability

OVERVIEW

The S93WD462 and S93WD463 are precision power

supervisory circuits providing both active high and

active low reset output. Both devices also incorporate a

watchdog timer with a nominal time-out value of 1.6

seconds.

accessible via the industry standard microwire bus. The

S93WD462 is configured with an internal ORG pin tied

low providing a 8-bit byte organization and the

S93WD463 is configured with an internal ORG pin tied

high providing a 16-bit word organization. Both the

S93WD462 and S93WD463 have page write capabil-

ity. The devices are designed for a minimum 100,000

program/erase cycles and have data retention in ex-

cess of 100 years.

BLOCK DIAGRAM

+

–

GND

VCC

8

5

RESET#

6

VTRIP

RESET

PULSE

GENERATOR

5kHz

OSCILLATOR

RESET

CONTROL

MODE

DECODE

ADDRESS

DECODER

WRITE

CONTROL

DATA I/O

E2PROM

MEMORY

ARRAY

RESET

7

1.26V

SK

2

DI

3

WATCHDOG

TIMER

CS

1

2029 T BD 2.0

DO

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