NJU7181

– 8 –

Version 5.1E

– Output will be or maintain high when either an input signal or trigger signal is detected. The

delay circuit will only be activated when both signals is not present. NJU7181 will then hold the

output level for a delay time which can be adjusted by the Capacitor value @ pin 5.

Power

LOW

LOW

High

Power On

Case 1: Trigger signal present (After output LOW)

Trigger

Trigger detected

Signal Detected

High due to triggger

Audio Signal Input

DC Output

(NJU7181)

LOW

Power

LOW

High

Power On

Hold Time

Case 2: Trigger signal present (Duringoutput HIGH)

Trigger

Trigger detected

Signal Detected

DC_Output maintainsHigh state.

(Counter RESET)

Audio Signal Input

DC Output

(NJU7181)

LOW