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CAT1024

Supervisory Circuits with EEPROM Serial 2k-bit I2C and Manual Reset

ON Semiconductor 

CAT1024, CAT1025

Supervisory Circuits with

EEPROM Serial 2k-bit I2C

and Manual Reset

Description

The CAT1024 and CAT1025 are complete memory and supervisory

solutions for microcontroller−based systems. A 2k−bit serial

EEPROM memory and a system power supervisor with brown−out

protection are integrated together in low power CMOS technology.

Memory interface is via a 400 kHz I2C bus.

The CAT1025 provides a precision VCC sense circuit and two open

drain outputs: one (RESET) drives high and the other (RESET) drives

low whenever VCC falls below the reset threshold voltage. The

CAT1025 also has a Write Protect input (WP). Write operations are

disabled if WP is connected to a logic high.

The CAT1024 also provides a precision VCC sense circuit, but has

only a RESET output and does not have a Write Protect input.

All supervisors have a 1.6 second watchdog timer circuit that resets

a system to a known state if software or a hardware glitch halts or

“hangs” the system. For the CAT1024 and CAT1022, the watchdog

timer monitors the SDA signal. The CAT1023 has a separate watchdog

timer interrupt input pin, WDI.

The power supply monitor and reset circuit protect memory and

system controllers during power up/down and against brownout

conditions. Five reset threshold voltages support 5 V, 3.3 V and 3 V

systems. If power supply voltages are out of tolerance reset signals

become active, preventing the system microcontroller, ASIC or

peripherals from operating. Reset signals become inactive typically

200 ms after the supply voltage exceeds the reset threshold level. With

both active high and low reset signals, interface to microcontrollers

and other ICs is simple. In addition, the RESET pin or a separate input,

MR, can be used as an input for push−button manual reset capability.

The CAT1024/25 memory features a 16−byte page. In addition,

hardware data protection is provided by a VCC sense circuit that

prevents writes to memory whenever VCC falls below the reset

threshold or until VCC reaches the reset threshold during power up.

Available packages include a surface mount 8−pin SOIC, 8−pin

TSSOP, 8−pin TDFN and 8−pin MSOP packages. The TDFN package

thickness is 0.8 mm maximum. TDFN footprint is 3 x 3 mm.

www.onsemi.com

TSSOP−8

CASE 948S

SOIC−8

CASE 751BD

MSOP−8

CASE 846AD

TDFN−8

CASE 511AL

ORDERING INFORMATION

For Ordering Information details, see page 13.

Features

• Precision Power Supply Voltage Monitor

♦ 5 V, 3.3 V and 3 V Systems

♦ Five Threshold Voltage Options

• Active High or Low Reset

♦ Valid Reset Guaranteed at VCC = 1 V

• 400 kHz I2C Bus

• 2.7 V to 5.5 V Operation

• Low Power CMOS Technology

• 16−Byte Page Write Buffer

• Built−in Inadvertent Write Protection

♦ WP Pin (CAT1025)

• 1,000,000 Program/Erase Cycles

• Manual Reset Input

• 100 Year Data Retention

• Industrial and Extended Temperature Ranges

• Green Packages Available with NiPdAu Lead Finished

• These Devices are Pb−Free, Halogen Free/BFR Free

and are RoHS Compliant

© Semiconductor Components Industries, LLC, 2011

1

May, 2018 − Rev. 21

Publication Order Number:

CAT1024/D

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