SUMMIT
MICROELECTRONICS, Inc.
S93WD662/S93WD663
Precision Supply-Voltage Monitor and Reset Controller
With a Watchdog Timer and 4k-bit Microwire Memory
FEATURES
鈥?Precision Monitor & RESET Controller
鈥?RESET and RESET# Outputs
鈥?Guaranteed RESET Assertion to V
CC
= 1V
鈥?200ms Reset Pulse Width
鈥?Internal 1.26V Reference with 鹵1% Accuracy
鈥?ZERO External Components Required
鈥?Watchdog Timer
鈥?Nominal 1.6 Second Time-out Period
鈥?Reset by Any Transition of CS
鈥?Memory
鈥?4K-bit Microwire Memory
鈥?S93WD662
鈥?Internally Ties ORG Low
鈥?100% Compatible With all 8-bit
Implementations
鈥?Sixteen Byte Page Write Capability
鈥?S93WD663
鈥?Internally Ties ORG High
鈥?100% Compatible With all 16-bit
Implementations
鈥?Eight Word Page Write Capability
BLOCK DIAGRAM
VCC
8
OVERVIEW
The S93WD662 and S93WD663 are precision power
supervisory circuits providing both active high and
active low reset outputs. Both devices incorporate a
watchdog timer with a nominal time-out value of 1.6
seconds.
Both devices have 4k-bits of E
2
PROM memory that is
accessible via the industry standard microwire bus. The
S93WD662 is configured with an internal ORG pin tied
low providing a 8-bit byte organization and the
S93WD663 is configured with an internal ORG pin tied
high providing a 16-bit word organization. Both the
S93WD662 and S93WD663 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.
5kHz
OSCILLATOR
RESET
PULSE
GENERATOR
6
RESET#
+
鈥?/div>
VTRIP
RESET
CONTROL
7
RESET
1.26V
CS
1
WATCHDOG
TIMER
SK
DI
2
3
MODE
DECODE
ADDRESS
DECODER
WRITE
CONTROL
DATA I/O
E2PROM
MEMORY
ARRAY
5
GND
SUMMIT MICROELECTRONICS, Inc.
鈥?/div>
300 Orchard City Drive, Suite 131
鈥?/div>
Campbell, CA 95008
鈥?/div>
2013 T BD 2.0
Telephone 408-378-6461
鈥?/div>
Fax 408-378-6586
鈥?/div>
www.summitmicro.com
漏 SUMMIT MICROELECTRONICS, Inc. 2000
2013 2.1 8/2/00
1
Characteristics subject to change without notice
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