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NE56604-42D

System reset with built-in Watchdog timer

Philips Electronics 

Philips Semiconductors

System reset with built-in Watchdog timer

Product data

NE56604-42

GENERAL DESCRIPTION

The NE56604-42 is designed to generate a reset signal at a

threshold voltage of 4.2 V for a variety of microprocessor and logic

systems. Accurate reset signals are generated during momentary

power interruptions, or whenever power supply voltages sag to

intolerable levels. The NE56604-42 has a built-in Watchdog Timer to

monitor the microprocessor and ensure it is operating properly. Any

abnormal system operations due to microprocessor malfunctions

are terminated by a system reset generated by the Watchdog. The

NE56604-42 has a Watchdog monitoring time of 100 ms (typical).

The NE56604-42 is offered in the SO8 surface mount package

(SOP005).

FEATURES

• Both positive and negative logic reset output signals are available

• Accurate threshold detection

• Internal power-on reset delay

• Internal Watchdog timer programmable with external resistor

• Watchdog monitoring time of 100 ms (typical)

• Reset assertion with VCC down to 0.8 VDC (typical)

• Few external components required.

APPLICATIONS

• Microcomputer systems

• Logic systems.

SIMPLIFIED SYSTEM DIAGRAM

VCC

5

RCT

VS 7

NE56604-42

R

R

VREF

C

6 RCT

RESET

GENERATOR

PROGRAMMABLE

WATCHDOG TIMER

8 RESET

2 RESET

3 CLK

4 GND

1 CT

LOGIC

SYSTEM

RESET

RESET

CLK

GND

Figure 1. Simplified system diagram.

SL01281

2003 Oct 15

2

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