CAT1641UI-25SOIC datasheet, PDF

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CAT1641UI-25SOIC: DescriptionSupervisory Circuits with I2C Serial 64K CMOS EEPROM; File Size127KB，18 Pages; ManufacturerCatalyst; Websitehttp://www.catalyst-semiconductor.com/

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CAT1641UI-25SOIC Overview

Supervisory Circuits with I2C Serial 64K CMOS EEPROM

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CAT1640, CAT1641

Supervisory Circuits with I

C Serial 64K CMOS EEPROM

FEATURES

Precision power supply voltage monitor

3.0V to 5.5V operation

Low power CMOS technology

64-Byte page write buffer

1,000,000 Program/Erase cycles

100 year data retention

GEN

ALO

— 5V, 3.3V and 3V systems

- +5.0V (+/- 5%, +/- 10%)

- +3.3V (+/- 5%, +/- 10%)

- +3.0V (+/- 10%)

Active low reset, CAT1640

Active high reset, CAT1641

Valid reset guaranteed at V

=1V

400kHz I

C bus

8-pin DIP, SOIC, TSSOP and TDFN packages

Industrial temperature range

DESCRIPTION

The CAT1640 and CAT1641 are complete memory and

supervisory solutions for microcontroller-based systems.

A 64kbit 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 400kHz I

C bus.

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 options,

interface to microcontrollers and other ICs is simple. In

addition, the

RESET

(CAT1640) pin can be used as an

input for push-button manual reset capability.

The CAT1640 provides a precision V

sense circuit

and drives an open drain output,

RESET

low whenever The CAT1640/41 memory features a 64-byte page. In

addition, hardware data protection is provided by a V

falls below the reset threshold voltage.

sense circuit that prevents writes to memory whenever V

The CAT1641 provides a precision VCC sense circuit falls below the reset threshold or until V

reaches the reset

that drives an open drain output, RESET high whenever threshold during power up.

VCC falls below the reset threshold voltage.

Available packages include an 8-pin DIP, SOIC, TSSOP

The power supply monitor and reset circuit protect and 4.9 x 3mm TDFN.

memory and system controllers during power up/down

and against brownout conditions. Five reset threshold

voltages support 5V, 3.3V and 3V systems. If power

supply voltages are out of tolerance reset signals become

PIN CONFIGURATION

PDIP (P, L) SOIC (J, W)

A0 1

A1 2

A2 3

VSS 4

CAT1640

8 VCC

RESET

6 SCL

5 SDA

TSSOP (U, Y)

A0 1

A1 2

A2 3

VSS 4

A0 1

A1 2

A2 3

VSS 4

CAT1641

TDFN PACKAGE: 4.9MM X 3MM

(RD2, ZD2)

8 VCC

RESET

6 SCL

5 SDA

8 VCC

7 RESET

6 SCL

5 SDA

VSS

VCC

RESET

SCL

SDA

CAT1640

A0 1

A1 2

A2 3

VSS 4

CAT1641

8 VCC

7 RESET

6 SCL

5 SDA

VSS

VCC

RESET

SCL

SDA

CAT1641

Characteristics subject to change without notice

Doc. No. 25082, Rev. 00

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