7/7/04

Page 7 of 14

© 2004 Fairchild Semiconductor Corporation

LOW INPUT CURRENT

LOGIC GATE OPTOCOUPLERS

FOD2200

1

2

3

4

8

7

6

5

1

2

3

4

8

7

6

5

Fig. 3. Test Circuit and Typical Waveforms for Common Mode Transient Immunity

50 V

OUTPUT

* SEE NOTE 6.

0 V

7

1

4

5

6

8

FOD2200

0.1

µF

BYPASS

MONITORING

NODE

2

3

A

B

–

+

PULSE GENERATOR

GND

FOD2200

DATA

INPUT

D1 (1N4150) REQUIRED FOR

ACTIVE PULL-UP DRIVER.

1.1 k

Ω

GND

D1

TTL OR

LSTTL

Figure 4. Recommended LSTTL to LSTTL Circuit.

Figure 6. Recommended LED Drive Circuit.

Figure 5. LSTTL to CMOS Interface Circuit.

Figure 7. Series LED Drive with Open Collector Gate

(4.7 k

120 pF

1

2

3

4

8

7

6

5

1

2

FOD2200

DATA

INPUT

TTL OR

LSTTL

(+5 V)

UP TO 16

LSTTL

LOADS

OR 4 TTL

LOADS

1.1

k

Ω

(+5 V)

DATA

OUTPUT

TOTEM

POLE

OUTPUT

GATE

GND

120 pF (OPTIONAL*)

*The 120pF capacitor may be omitted in applications where 500ns propagation delay is sufficient.

FOD2200

DATA

INPUT

TTL OR

LSTTL

1.1

k

Ω

OPEN

COLLECTOR

GATE

GND

4.7 k

Ω

120 pF (OPTIONAL*)

1

2

FOD2200

DATA

INPUT

TTL OR

LSTTL

(4.5 TO 20 V)

1.1

k

Ω

(+5 V)

DATA

OUTPUT

TOTEM

POLE

OUTPUT

GATE

GND

CMOS

5 V

10 V

15 V

20 V

1.1 K

2.37 K

3.83 K

5.11 K

1

2

3

4

8

7

6

5