NE56605-42D View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

NE56605-42D

System reset with built-in watchdog timer

Philips Electronics 

Philips Semiconductors

System reset with built-in watchdog timer

Product data

NE56605-42

GENERAL DESCRIPTION

The NE56605-42 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 NE56605-42 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 the watchdog’s generating a system reset. The

NE56605-42 has a watchdog monitoring time of 10 ms (typical).

The NE56605-42 is offered in the SO8 surface mount package.

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 capacitor

• Watchdog monitoring time of 10 ms

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

• Few external components required.

APPLICATIONS

• Microcomputer systems

• Logic systems.

SIMPLIFIED SYSTEM DIAGRAM

VCC

5

VS 7

NE56605-42

R

R

VREF

C

6 WDC

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.

ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

NE56605-42D

SO8

plastic small outline package; 8 leads; body width 3.9 mm

SL01282

TEMPERATURE

RANGE

–20 to +70 °C

2001 Aug 22

2

853–2251 26949

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