CAT1021, CAT1022, CAT1023
PIN DESCRIPTION
¯¯¯¯¯¯
RESET/RESET:
RESET OUTPUT
(RESET CAT1021/23 Only)
¯¯¯¯¯¯
These are open drain pins and RESET can be used
as a manual reset trigger input. By forcing a reset
condition on the pin the device will initiate and
maintain a reset condition. The RESET pin must be
connected through a pull-down resistor, and the
¯¯¯¯¯¯
RESET pin must be connected through a pull-up
resistor.
SDA:
SERIAL DATA ADDRESS
The bidirectional serial data/address pin is used to
transfer all data into and out of the device. The SDA
pin is an open drain output and can be wire-ORed
with other open drain or open collector outputs.
SCL:
SERIAL CLOCK
Serial clock input.
¯¯¯:
MANUAL RESET INPUT
MR
Manual Reset input is a debounced input that can be
connected to an external source for Manual Reset.
Pulling the MR input low will generate a Reset
condition. Reset outputs are active while MR input is
low and for the reset timeout period after MR returns
to high. The input has an internal pull up resistor.
WP (CAT1021 Only):
WRITE PROTECT INPUT
When WP input is tied to V
SS
or left unconnected write
operations to the entire array are allowed. When tied
to V
CC
, the entire array is protected. This input has an
internal pull down resistor.
WDI (CAT1023 Only):
WATCHDOG TIMER INTERRUPT
Watchdog Timer Interrupt Input is used to reset the
watchdog timer. If a transition from high to low or low
to high does not occur every 1.6 seconds, the RESET
outputs will be driven active.
PIN FUNCTION
Pin
Name
NC
¯¯¯¯¯¯
RESET
V
SS
SDA
SCL
RESET
V
CC
WP
¯¯¯
MR
WDI
Function
No Connect
Active Low Reset Input/Output
Ground
Serial Data/Address
Clock Input
Active High Reset Output (CAT1021/23)
Power Supply
Write Protect (CAT1021 only)
Manual Reset Input
Watchdog Timer Interrupt (CAT1023)
OPERATING TEMPERATURE RANGE
Industrial
Extended
-40ºC to 85ºC
-40ºC to 125ºC
CAT102X FAMILY OVERVIEW
Device
Manual
Reset
Input Pin
Watchdog
Watchdog
Monitor
Pin
SDA
SDA
WDI
Write
Protection
Pin
Independent
Auxiliary
Voltage Sense
RESET:
Active High
and LOW
EEPROM
2k
CAT1021
CAT1022
2k
2k
CAT1023
CAT1024
2k
2k
CAT1025
2k
CAT1026
WDI
CAT1027
2k
For supervisory circuits with embedded 16k EEPROM, please refer to the CAT1161, CAT1162 and CAT1163
data sheets.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-3009 Rev. M
CATALYST [ CATALYST SEMICONDUCTOR ]
