INHIBIT

The Output Duration Timer can be inhibited from trig-

gering by the voltage level at the INHIBIT input. When this

voltage level exceeds the Inhibit Threshold, the Timer will

be prevented from triggering if it is OFF. If the Timer is

ON, the INHIBIT input is blocked from affecting the Timer.

There is approximately 10% hysteresis between the In-

hibit and Enable thresholds at the INHIBIT input. The LED

output is not affected by the INHIBIT input. An adjustable

Ambient Light Level Inhibit can be implemented by con-

necting a Light Determining Resistor (LDR) network to the

INHIBIT input (See Figures 3 and 4).

DEAD TIME

False turn-ons are prevented from occurring by es-

tablishing a Dead Time between the end of the timeout of

the Output Duration Timer and the retriggering of that

Timer. The state of the DEAD TIME SELECT input de-

termines the Dead Time duration (See Table 2).

OSCILLATOR

For battery operation, an external RC is connected to the

OSCILLATOR input to produce a 50Hz or 60Hz clock. A

30Hz clock can be used to extend timing durations (See

Tables 1 and 2).

DC POWER SUPPLY

DC REGULATOR

The LS6501LP includes a Regulator which provides a

nominal +5V to the Differential Amplifier and Window

Comparator and is available as an output to supply the

PIR Sensor.

TRIAC/RELAY OUTPUT

This open drain output turns ON when the Output Dura-

tion Timer is triggered. The output drives a Triac when

the OSCILLATOR input is tied to ground and 50/60Hz is

applied to the AC input (See Figure 3). The output drives

a Relay when the AC input is tied to ground and an RC

network is connected to the OSCILLATOR input (See

Figure 4).

TRIAC DRIVE (See Figure 3)

With the Output Duration Timer ON and a 2.7V P-P

60Hz signal applied to the AC input, the output produces

a negative-going pulse in each half-cycle delayed a

nominal 1.2ms from the zero crossing. There is no more

than 150µs difference between the zero-crossing delay

of each pulse.

RELAY DRIVE (See Figure 4)

The output can sink current continously with the Output

Duration Timer ON and the OSCILLATOR input active.

This output can sink current from a relay coil returned to

0

30

18

15

60

36

30

90

54

45

120

72

60

4

2.4

2

6

3.6

3

8

4.8

4

10

6

5

12

7.2

6

14

8.4

7

16

9.6

8

18

10.8

9

20

12

10

24

14.4

12

28

16.8

14

30

18

15

TABLE 1

OUTPUT DURATION TIMER AS A FUNCTION OF TIMER CONTROL INPUT VOLTAGE

(f = Frequency at AC input or OSCILLATOR input)

INPUT VOLTAGE

f = 30Hz

f = 50Hz

f = 60Hz

UNIT

TABLE 2

DEAD TIME DURATION AS A FUNCTION OF THE STATE OF DEAD TIME SELECT INPUT

(f = Frequency at AC input or OSCILLATOR input)

INPUT STATE

f = 30Hz

f = 50Hz

f = 60Hz

UNIT

0

2

1.2

1

OPEN

8

4.8

4

1

16

9.6

8

6501LP-012703-2

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