SUMMIT
MICROELECTRONICS, Inc.
S93WD662/S93WD663
Precision Supply-Voltage Monitor and Reset Controller
With a Watchdog Timer and 4k-bit Microwire Memory
FEATURES
• Precision Monitor & RESET Controller
— RESET and RESET# Outputs
— Guaranteed RESET Assertion to V
CC
= 1V
— 200ms 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
— 4K-bit Microwire Memory
— S93WD662
– Internally Ties ORG Low
– 100% Compatible With all 8-bit
Implementations
– Sixteen Byte Page Write Capability
— S93WD663
– Internally Ties ORG High
– 100% Compatible With all 16-bit
Implementations
– 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#
+
–
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.
•
300 Orchard City Drive, Suite 131
•
Campbell, CA 95008
•
2013 T BD 2.0
Telephone 408-378-6461
•
Fax 408-378-6586
•
www.summitmicro.com
© SUMMIT MICROELECTRONICS, Inc. 2000
2013 2.1 8/2/00
1
Characteristics subject to change without notice
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
