6N138_07 datasheet(6/15 Pages) FAIRCHILD | Low Input Current High Gain Split Darlington Optocouplers

6 page

www.fairchildsemi.com

6N138, 5N139, NCPL2730, HCPL2731 Rev. 1.0.3

Electrical Characteristics (TA = 25°C unless otherwise speciﬁed)

Current Limiting Resistor Calculations

R1 (Non-Invert) = VDD1 - VDF - VOL1

R1 (Invert) = VDD1 - VOH1 - VDF

R2 = VDD2 - = VOLX (@ IL - I2)

Where:

VDD1 - Input Supply Voltage

VDD2 - Output Supply Voltage

VDF - Diode Forward Voltage

VOL1 - Logic “0” Voltage of Driver

VOH1 - Logic “1” Voltage of Driver

IF - Diode Forward Current

VOLX - Saturation Voltage of

Output Transistor

IL - Load Current Through

Resistor R2

I2 - Input Current of Output Gate

OUT

VDD1

DD2

OUT

DD2

Fig. 2 Non-Inverting Logic Interface

Fig. 3 Inverting Logic Interface

INPUT

R1 (V)

OUTPUT

CMOS

@ 5V

CMOS

@ 10V

74XX

74LXX

74SXX

74LSXX

74HXX

R2 (V)

CMOS

@ 5V

NON-INV. 2000

1000

2200

750

1000

560

INV.

510

CMOS

@ 10V

NON-INV. 5100

INV.

4700

74XX

NON-INV. 2200

INV.

180

74LXX

NON-INV. 1800

INV.

100

74SXX

NON-INV. 2000

INV.

360

74LSXX NON-INV. 2000

INV.

180

74HXX

NON-INV. 2000

INV.

180

Fig. 1 Resistor Values for Logic Interface

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