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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
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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
— 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
V
CC
8
5
RESET#
6
V
TRIP
RESET
PULSE
GENERATOR
5kHz
OSCILLATOR
RESET
CONTROL
MODE
DECODE
ADDRESS
DECODER
WRITE
CONTROL
DATA I/O
E
2
PROM
MEMORY
ARRAY
RESET
7
1.26V
SK
2
DI
3
WATCHDOG
TIMER
CS
1
2029 T BD 2.0
DO
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