SMS1242S データシートの表示（PDF） - Summit Microelectronics

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SMS1242S

2.5V, 3V, 3.3V & 5V Dual Voltage, Dual Reset Microprocessor Supervisory Circuits

Summit Microelectronics 

SUMMIT

MICROELECTRONICS, Inc.

2.5V, 3V, 3.3V & 5V Dual Voltage, Dual Reset

Microprocessor Supervisory Circuits

SMS1242

FEATURES

• Supply voltage monitor

- Nominal VRST of 2.45V, 2.65V, 2.95V, 4.45V,

4.55V or 4.65V

- RESET# Outputs Guaranteed true at VCC = 1V

- 150ms Reset Delay Time

• Second voltage monitor

- VSENSE Input

- 1.25V threshold ±1%

• Manual Reset Input

• Includes 16k-bits nonvolatile memory

- Industry standard 2-wire serial interface

OVERVIEW

The SMS1242 microprocessor supervisory circuit re-

duces the complexity and number of components required

to monitor the supply voltage in +5V, +3V and +2.5V

systems. The SMS1242 will significantly improve system

reliability and accuracy when compared to implementing

the same functions with discrete components.

The SMS1242 provides reset output during power-up,

power-down, and brown-out conditions. It has a 1.25V

threshold input detector for power-fail warning, low battery

detection, or monitoring a secondary power supply. The

part also integrates a separate active low manual reset

input.

It also has 16k-bits of nonvolatile memory accessible over

an industry standard 2-wire serial interface.

FUNCTIONAL BLOCK DIAGRAM

VCC

8

SCL 6

SDA 5

NONVOLATILE

MEMORY

ARRAY

VSENSE 3

+

–

7 MR#

2 RESET1#

+

VTRIP

–

RESET

GENERATOR

1.25V

1 RESET2#

4

GND

2038 BD 2.0

© SUMMIT MICROELECTRONICS, Inc. 2000 • 300 Orchard City Drive, Suite 131 • Campbell, CA 95008 • Phone 408-378-6461 • Fax 408-378-6586 • www.summitmicro.com

2038 2.0 6/8/00

Characteristics subject to change without notice

1

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