CAT1026YI-30 View Datasheet(PDF) - Catalyst Semiconductor => Onsemi

Part Name

Description

MFG CO.

CAT1026YI-30

Dual Voltage Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM

Catalyst Semiconductor => Onsemi 

PIN DESCRIPTION

RESET/R¯¯E¯S¯E¯T¯: RESET OUTPUTs

(RESET CAT1026 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.

VSENSE: AUXILIARY VOLTAGE MONITOR INPUT

The VSENSE input is a second voltage monitor which is

compared against CAT1026 and CAT1027 internal

reference voltage of 1.25V typically. Whenever the

input voltage is lower than 1.25V, the open drain VLOW

output will be driven low. An external resistor divider is

used to set the voltage level to be sensed. Connect

VSENSE to VCC if unused.

VLOW: AUXILIARY VOLTAGE MONITOR OUTPUT

This open drain output goes low when VSENSE is less

than 1.25V and goes high when VSENSE exceeds the

reference voltage.

WDI (CAT1027 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.

CAT1026, CAT1027

PIN FUNCTION

Pin

Name

R¯¯E¯S¯E¯T¯

VSS

SDA

SCL

RESET

VCC

VSENSE

VLOW

WDI

Function

Active Low Reset Input/Output

Ground

Serial Data/Address

Clock Input

Active High Reset Output

(CAT1026 only)

Power Supply

Auxiliary Voltage Monitor Input

Auxiliary Voltage Monitor Output

Watchdog Timer Interrupt

(CAT1027 only)

OPERATING TEMPERATURE RANGE

Industrial -40ºC to 85ºC

Extended -40ºC to 125ºC

CAT10XX FAMILY OVERVIEW

Device

CAT1021

Manual

Reset

Input Pin

Watchdog

Watchdog

Monitor

Pin

SDA

Write

Protection

Pin

Independent

Auxiliary

Voltage Sense

RESET:

Active High

and LOW

EEPROM

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.

© 2007 Catalyst Semiconductor, Inc.

3

Characteristics subject to change without notice

Doc. No. 3010 Rev. L

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