CAT1021(2004) データシートの表示（PDF） - Catalyst Semiconductor => Onsemi

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CAT1021
(Rev.:2004)

Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer

Catalyst Semiconductor => Onsemi 

CAT1021, CAT1022, CAT1023

PIN DESCRIPTION

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.

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 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.

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 FUNCTIONS

Pin Name

NC

RESET

VSS

SDA

SCL

RESET

VCC

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)

CAT102X FAMILY OVERVIEW

OPERATING TEMPERATURE RANGE

Industrial

Extended

-40˚C to 85˚C

-40˚C to 125˚C

Device

Manual

Reset

Input Pin

Watchdog Write

Watchdog Monitor Protection

Pin

Pin

Independent

Auxiliary

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.

3

Doc No. 3009, Rev. K

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