Preliminary Information
PIN DESCRIPTION
CAT1021, CAT1022, CAT1023
MR:
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.
RESET/RESET: RESET OUTPUTS
(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
thepinthedevicewillinitiateandmaintainaresetcondition.
The RESET pin must be connected through a pull-down
resistor, and the RESET pin must be connected through a
pull-up resistor.
WP (CAT1021 Only): WRITE PROTECT INPUT
When WP input is tied to VSS or left unconnected write
operations to the entire array are allowed. When tied to
VCC, the entire array is protected. This input has an
internal pull down resistor.
SDA: SERIAL DATA ADDRESS
Thebidirectionalserialdata/addresspinisusedtotransfer
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.
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.
SCL: SERIAL CLOCK
Serial clock input.
PIN FUNCTIONS
OPERATING TEMPERATURE RANGE
Pin Name
Function
Industrial
Automotive
Extended
-40˚C to 85˚C
-40˚C to 105˚C
-40˚C to 125˚C
NC
RESET
VSS
No Connect
Active Low Reset Input/Output
Ground
SDA
SCL
Serial Data/Address
Clock Input
RESET
VCC
Active High Reset Output (CAT1021/23)
Power Supply
WP
Write Protect (CAT1021 only)
MR
Manual Reset Input
WDI
Watchdog Timer Interrupt (CAT1023)
CAT10XX FAMILY OVERVIEW
Manual
Reset
Input Pin
Watchdog
Monitor
Pin
Write
Protection
Pin
Independent
Auxiliary
Voltage Sense
RESET: Active
High and LOW
Device
Watchdog
EEPROM
CAT1021
SDA
2k
CAT1022
CAT1023
CAT1024
CAT1025
CAT1026
CAT1027
SDA
WDI
2k
2k
2k
2k
2k
2k
WDI
For Supervisory circuits with embedded 16k EEPROM, please refer to the CAT1161, CAT1162 and CAT1163
data sheets.
Doc No. 3009, Rev. E
3
CATALYST [ CATALYST SEMICONDUCTOR ]
