NE56611(2001) データシートの表示（PDF） - Philips Electronics

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NE56611
(Rev.:2001)

System Reset

Philips Electronics 

Philips Semiconductors

NE56610/11/12 Series

System Reset

Application Information

When the manual reset is not needed, the M/R, manual reset

pin is connected to ground as shown in Figure 16 - Typical Hard

Reset Circuit. A capacitor connected from VCC to ground is

recommended when the VCC supply impedance is appreciably

high. This may be the situation with a poor quality or aged

battery.

The second example, shown in Figure 17 - Manual Reset

Circuit, incorporates a manual reset switch from the M/R pin to

VCC. When the manual switch is closed, VOUT reset is logic

high. Conversely, when it is opened, VOUT reset is logic low. As

a precaution a clamp diode is placed from the M/R pin to ground

to insure that the pin does not go below - 0.3V.

Figure 16. Typical Hard Reset Circuit

Figure 17. Manual Reset Circuit

To VCC

RL

5

VCC

4

VOUT

To CPU

Reset Pin

To VCC

Manual

Switch

RL

5

VCC

4

VOUT

To CPU

Reset Pin

M/R SUB GND

123

Clamp

Diode

M/R SUB GND

123

Test Circuits

Figure 16. Test Circuit 1

A2

A1

10µF

/ 10V

VCC

V1

VRES

RL

5

VCC

4

VOUT

M/R SUB GND V2

12

3

Figure 17. Test Circuit 2

Input

Pulse

5

VCC

4

VOUT

RL

10µF

/ 10V

M/R SUB GND

1

2

3

CRT

CL = 100pF

5.0 V

February 23, 2001

A - DC Ammeter

V = DC Voltmeter

Input Pulse

VS typ +0.4V

VS typ -0.4V

8 of 9

CRT = Oscilliscope

0V

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