CAT1023LI-25-G Datasheet, PDF (3/21 Pages) ON Semiconductor – Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer

CAT1021, CAT1022, CAT1023
PIN DESCRIPTION
RESET/R¯¯E¯S¯E¯T¯: RESET OUTPUT
(RESET CAT1021/23 Only)
These are open drain pins and R¯¯E¯S¯E¯T¯ 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
R¯¯E¯S¯E¯T¯ 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.
¯M¯R¯: _{MANUAL RESET INPUT}
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
R¯¯E¯S¯E¯T¯
V_SS
SDA
SCL
RESET
V_CC
WP
¯M¯R¯
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 -40ºC to 85ºC
Extended -40ºC to 125ºC
CAT102X FAMILY OVERVIEW
Device
Manual
Watchdog Write
Independent
Reset Watchdog Monitor Protection
Auxiliary
Input Pin
Pin
Pin
Voltage Sense
RESET:
Active High
and LOW
EEPROM
CAT1021
SDA
2k
CAT1022
SDA
2k
CAT1023
WDI
2k
CAT1024
2k
CAT1025
2k
CAT1026
2k
CAT1027
WDI
2k
For supervisory circuits with embedded 16k EEPROM, please refer to the CAT1161, CAT1162 and CAT1163
data sheets.
© 2009 SCILLC. All rights reserved.
3
Characteristics subject to change without notice
Doc. No. MD-3009 Rev. P