18

VCC1

5 V

GND 1

D1*

SHIELD

DUAL CHANNEL DEVICE

CHANNEL 1 SHOWN

8

7

5

390

Ω

0.1 µF

BYPASS

1

2

+

–

5 V

GND 2

VCC2

2

470

Ω

1

IF

VF

*DIODE D1 (1N916 OR EQUIVALENT) IS NOT REQUIRED FOR UNITS WITH OPEN COLLECTOR OUTPUT.

VCC1

5 V

GND 1

D1*

I F

VF

SHIELD

SINGLE CHANNEL DEVICE

8

6

5

390

Ω

0.1 µF

BYPASS

2

3

+

–

5 V

GND 2

VCC2

2

470

Ω

1

7

VE

Figure 18. Recommended TTL/LSTTL to TTL/LSTTL Interface Circuit.