NE56625-20 Ver la hoja de datos (PDF) - Philips Electronics

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NE56625-20

System reset with Watchdog timer

Philips Electronics 

Philips Semiconductors

System reset with Watchdog timer

Product data

NE56625-20

Watchdog monitoring time

The Watchdog timer’s external component values are critical to its

performance.

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 17 for parameter definitions.

The effect of RCT on the Watch-Dog Timer Monitoring Time at room

temperature for CT = 0.0022 µF is shown in Figure 22.

100

CT = 0.0022 µF

Tamb = 25 °C

80

60

40

20

0

10k

100k

1M

10M

100M

∞

RCT, WATCHDOG TIMER CURRENT RESISTOR (Ω)

SL01587

Figure 22. Watchdog monitoring vs. pull-up resistor RCT.

PACKING METHOD

The NE56625-20 is packed in reels, as shown in Figure 23.

GUARD

BAND

TAPE

REEL

ASSEMBLY

BARCODE

LABEL

TAPE DETAIL

COVER TAPE

CARRIER TAPE

BOX

Figure 23. Tape and reel packing method.

SL01305

2003 Oct 15

13

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