CAT1025 CATALYST [Catalyst Semiconductor], CAT1025 Datasheet

CAT1025

Manufacturer Part Number

CAT1025

Description

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

Manufacturer

CATALYST [Catalyst Semiconductor]

Datasheet

1.CAT1025.pdf (20 pages)

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RESET

Preliminary Information

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 400kHz I

The CAT1025 provides a precision V

and two open drain outputs: one (RESET) drives high

and the other (RESET) drives low whenever V

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 V

circuit, but has only a RESET output and does not have

a Write Protect input.

The power supply monitor and reset circuit protect

memory and system controllers during power up/down

and against brownout conditions. Five reset threshold

PIN CONFIGURATION

RESET

CAT1024, CAT1025

Supervisory Circuits with I

FEATURES

Characteristics subject to change without notice

V SS

Precision power supply voltage monitor

— 5V, 3.3V and 3V systems

— Five threshold voltage options

Active high or low reset

— Valid reset guaranteed at V

400kHz I

3.0V to 5.5V operation

Low power CMOS technology

TSSOP Package (U, Y)

MSOP Package (R, Z)

SOIC Package (J, W)

DIP Package (P, L)

CAT1025

CAT1024

C bus

V CC

SCL

SDA

V CC

SCL

SDA

C bus.

0.8mm maximum height - (RD4, ZD4)

C Serial 2k-bit CMOS EEPROM and Manual Reset

= 1V

TDFN Package: 3mm x 3mm

sense circuit

V CC

SDA

SCL

(Bottom View)

sense

falls

CAT1025

CAT1024

voltages support 5V, 3.3V and 3V 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 V

sense circuit that prevents writes to memory whenever V

falls below the reset threshold or until V

threshold during power up.

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

TSSOP, 8-pin TDFN and 8-pin MSOP. The TDFN package

thickness is 0.8mm maximum. TDFN footprint is 3x3mm.

RESET

V SS

RESET

V SS

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

8-pin DIP, SOIC, TSSOP, MSOP &

TDFN (3x3mm foot print) packages

Industrial and extended temperature ranges

reaches the reset

Doc No. 3008, Rev. M

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