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NE56605-42

System reset with built-in watchdog timer

Philips Electronics 

Philips Semiconductors

System reset with built-in watchdog timer

Product data

NE56605-42

Part number marking

The package is marked with a four letter code in the first line to the

right of the logo. The first three letters designate the product. The

fourth letter, represented by ‘x’, is a date tracking code. The

remaining two or three lines of characters are internal manufacturing

codes.

PIN CONFIGURATION

CT 1

RESET 2

CLK 3

GND 4

TOP VIEW

SO8

8 RESET

7 VS

6 WDC

5 VCC

SL01279

Figure 2. Pin configuration.

Part number

NE56605-42

Marking

AAE x

PIN DESCRIPTION

PIN

SYMBOL

1

CT

2

RESET

3

CLK

4

GND

5

VCC

6

WDC

7

VS

8

RESET

DESCRIPTION

tWDM, tWDR, tPR adjustment pin.

tWDM, tWDR, tPR times are dependent on the value of external CT capacitor used. See Figure 18 (Timing

Diagram) for definition of tWDM, tWDR, tPR times.

Reset HIGH output pin.

Clock input pin from logic system for watchdog timer.

Circuit ground.

Power supply pin for circuit.

Watchdog timer control pin.

The watchdog timer is enabled when this pin is unconnected, and disabled when this pin is connected to

ground.

Detection threshold adjustment pin.

The detection threshold can be increased by connecting this pin to VCC with a pull-up resistor. The detection

threshold can be decreased by connecting this pin to ground with a pull-down resistor.

Reset LOW output pin.

MAXIMUM RATINGS

SYMBOL

PARAMETER

VCC

VS

VCLK

VOH

Toper

Tstg

P

Power supply voltage

VS pin voltage

CLK pin voltage

RESET and RESET pin voltage

Operating temperature

Storage temperature

Power dissipation

MIN.

–0.3

–0.3

–0.3

–0.3

–20

–40

–

MAX.

10

10

10

10

70

125

250

UNIT

V

V

V

V

°C

°C

mW

2001 Aug 22

3

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