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Summit S93WD462 User Manual

Summit, Microelectronics, inc

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

1

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
— Guaranteed RESET Assertion to V

CC

= 1V

— 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.

Both devices have 1k-bits of E

2

PROM memory that is

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

4

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