NE56632-43D datasheet(11/16 Pages) PHILIPS

Part #	NE56632-43D

Description	Active-LOW system reset with adjustable delay time

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Manufacturer	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

Product data

NE56632-XX

Active-LOW system reset with adjustable delay time

2002 Mar 25

11

APPLICATION INFORMATION

A typical application circuit for the NE56632-XX is shown in

Figure 24. Note that a pull-up resistor, RPU is necessary since the

output is an open collector. The value of RPU is calculated by the

following expression.

RPU ≥ (VCC – VRESET) / IOL

where:

VCC = VS(min) – 0.05 V (for a 3 V reset this is 2.905 V)

VRESET = 0.4 V (this is VOL(max))

IOL = 5 mA; minimum output current at Tamb = 25 °C

Substituting these values into the expression and calculating, finds

RPU should be greater than or equal to 510 Ω. To ensure that the

Active-LOW level is sufficient, a value of 4.7 k

Ω is chosen in the test

and application examples.

12

3

4

5

NE56632-XX

RPU

TO RESET

TERMINAL

OF CPU

SL01605

CD

TO VCC

Figure 24. Typical application.

Figure 25 (NE56632-20 CD versus tPLH) and Figure 26

(NE56632-44 CD versus tPLH) show how tPHL, the “H” transmission

delay or reset release delay time varies as a function of the external

delay capacitance, CD. From Figure 26, typical range of the delay

capacitance is 1 pF to 10 nF which yields typical delays from 200

µs

to 200 ms.

The following formula can be used to find the approximate delay

time based on external delay capacitance, CD and the delay time

coefficient, d shown in Table 2.

tPLH (ms) ≈ CD (µF) × d

For example, a NE56632-44 using an external capacitor,

CD = 1 nF = 1000 pF yields:

tPLH (ms) ≈ (1 × 10–3) (1.85 × 104) ≈ 18.5 ms

Compare this to the value of tPLH ≈ 17 ms for CD = 1000 pF that is

extracted from Figure 26.

SL01611

CD (pF)

1.0E+01

1.0E+02

1.0E+03

1.0E+00

1.0E+04

1.0E–01

1.0E–02

1.0E–03

1.0E–04

1.0E–05

Figure 25. NE56632-20 CD versus tPLH characteristics.

SL01612

CD (pF)

1.0E+01

1.0E+02

1.0E+03

1.0E+00

1.0E+04

1.0E–01

1.0E–02

1.0E–03

1.0E–04

1.0E–05

Figure 26. NE56632-44 CD versus tPLH characteristics.

Table 2. Delay time coefficient

Device

d

NE56632–46

1.95

× 104

NE56632–45

1.90

× 104

NE56632–44

1.85

× 104

NE56632–43

1.80

× 104

NE56632–42

1.75

× 104

NE56632–31

1.20

× 104

NE56632–30

1.15

× 104

NE56632–29

1.10

× 104

NE56632–28

1.05

× 104

NE56632–27

1.00

× 104

NE56632–20

0.65

× 104

NE56632–19

0.60

× 104

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