Advanced Information
CAT93CXXXX (1K-16K)
2
Supervisory Circuits with Microwire Serial CMOS E PROM, Precision Reset Controller and Watchdog Timer
FEATURES
■ Active High or Low Reset Outputs
—Precision Power Supply Voltage Monitoring
—5V, 3.3V and 3V options
■ Watchdog Timer
■ Programmable Reset Threshold
■ Built-in Inadvertent Write Protection
■ Hardware and Software Write Protection
■ Power-Up Inadvertant Write Protection
■ 1,000,000 Program/Erase Cycles
■ 100 Year Data Retention
—VCC Lock Out
■ High Speed Operation: 3MHz
■ Low Power CMOS Technology
■ x 16 or x 8 Selectable Serial Memory
■ Self-Timed Write Cycle with Auto-Clear
■ Sequential Read
■ Commercial, Industrial, and Automotive
Temperature Ranges
■ 2.7-6.0 Volt Operation
■ 16 Byte Page Mode
■ Fast Nonvolatile Write Cycle: 3ms Max
DESCRIPTION
duringbrownoutandpowerup/downconditions. During
system failure the watchdog timer feature protects the
microcontroller with a reset signal. Catalyst's advanced
CMOS technology substantially reduces device power
requirements. The 93CXXXX isavailable in 8-pin DIP, 8-
pin TSSOP or 8-pin SOIC packages. It is designed to
endure 1,000,000 program/erase cycles and has a data
retention of 100 years.
The CAT93CXXXX is a single chip solution to three
popular functions of EEPROM memory, precision reset
controller and watchdog timer. The serial EEPROM
memoryofthe93CXXXXcanbeconfiguredeitherby16-
bits or by 8-bits. Each register can be written (or read)
by using the DI (or DO pin).
The reset function of the 93CXXXX protects the system
PIN CONFIGURATION
BLOCK DIAGRAM
93CX63X
93CX61X
93CX62X
V
GND
CC
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
CS
SK
DI
V
CS
V
CC
CS
SK
DI
V
CC
RESET
CC
RESET(RESET) SK
RESET(RESET)
WDI
ORG
GND
DI
RESET
GND
DO
DO
GND
DO
ADDRESS
DECODER
ORG
MEMORY ARRAY
PIN FUNCTIONS
Pin Name
Function
CS
Chip Select
Reset I/O
DATA
REGISTER
RESET/RESET
OUTPUT
BUFFER
DI
SK
DI
Clock Input
MODE DECODE
LOGIC
Serial Data Input
CS
DO
Serial Data Output
CLOCK
GENERATOR
DO
VCC
GND
ORG
+2.7 to 6.0V Power Supply
Ground
SK
RESET Controller
High
Precision
Memory Organization
WATCHDOG
Vcc Monitor
Note: When the ORG pin is connected to VCC, the X16 organiza
tion is selected. When it is connected to ground, the X8 pin
is selected. If the ORG pin is left unconnected, then an
internal pullup device will select the X16 organization.
WDI RESET/RESET
© 1998 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9-85