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CAT1021 Datasheet(PDF) 3 Page - Catalyst Semiconductor

Part No. CAT1021
Description  Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer
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Maker  CATALYST [Catalyst Semiconductor]
Homepage  http://www.catalyst-semiconductor.com
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CAT1021 Datasheet(HTML) 3 Page - Catalyst Semiconductor

 
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CAT1021, CAT1022, CAT1023
Doc No. 3009, Rev. K
PIN DESCRIPTION
RESET/
RESET
RESET
RESET
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
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.
PIN FUNCTIONS
Pin Name
Function
NC
No Connect
RESET
Active Low Reset Input/Output
VSS
Ground
SDA
Serial Data/Address
SCL
Clock Input
RESET
Active High Reset Output (CAT1021/23)
VCC
Power Supply
WP
Write Protect (CAT1021 only)
MR
Manual Reset Input
WDI
Watchdog Timer Interrupt (CAT1023)
CAT102X FAMILY OVERVIEW
For supervisory circuits with embedded 16k EEPROM, please refer to the CAT1161, CAT1162 and CAT1163
data sheets.
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OPERATING TEMPERATURE RANGE
Industrial
-40˚C to 85˚C
Extended
-40˚C to 125˚C
MR:
MR:
MR:
MR:
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.
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.


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