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NE56604-42

System reset with built-in Watchdog timer

Philips Electronics 

Philips Semiconductors

System reset with built-in Watchdog timer

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NE56604-42

The values of RCT and CT affect the Watchdog monitoring time

(tWDM), the Watchdog reset time (tWDR), and power-on reset delay

time (tPR). See Formula 1 in the AC Electrical Characteristics and

the Timing diagram shown in Figure 20 for parameter definitions.

Also see Figures 11 through 18 for typical time relationship

performance.

The effect of RCT on the Watchdog timer monitoring time at room

temperature for CT = 0.1 mF is shown in Figure 25.

100

CT = 0.1 µF

Tamb = 25 °C

80

60

40

20

0

10k

100k

1M

10M

100M

∞

RCT, WATCHDOG TIMER CURRENT RESISTOR (Ω)

SL01329

Figure 25. Watchdog monitoring vs. pull-up resistor RCT.

2003 Oct 15

12

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