Data Sheet

©2005 Fairchild Semiconductor Corporation www.fairchildsemi.com
6N138, 5N139, NCPL2730, HCPL2731 Rev. 1.0.5 6
Single-Channel: 6N138, 6N139 Dual-Channel: HCPL2730, HCPL2731 — Low Input Current High Gain Split Darlington Optocouplers
Electrical Characteristics (Continued) T
A
= 25°C unless otherwise specified)
Current Limiting Resistor Calculations
R
1
(Non-Invert) = V
DD1
– V
DF
– V
OL1
I
F
R
1
(Invert) = V
DD1
– V
OH1
– V
DF
I
F
R
2
= V
DD2
= V
OLX
(@ I
L
– I
2
)
I
L
Where:
V
DD1
= Input Supply Voltage
V
DD2
= Output Supply Voltage
V
DF
= Diode Forward Voltage
V
OL1
= Logic “0” Voltage of Driver
V
OH1
= Logic “1” Voltage of Driver
I
F
= Diode Forward Current
V
OLX
= Saturation Voltage of
Output Transistor
I
L
= Load Current Through
Resistor R2
I
2
= Input Current of Output Gate
Fig. 2 Non-Inverting Logic Interface Fig. 3 Inverting Logic Interface
Fig. 1 Resistor Values for Logic Interface
3
4
2
1
6
5
7
8
2
R
1
RIN
OUT
V
DD1 DD2
V
IN
4
3
2
5
6
7
R
2
OUT
1 8
DD2
V
R
1
INPUT R1 (V)
OUTPUT
CMOS
@ 5V
CMOS
@ 10V
74XX 74LXX 74SXX 74LSXX 74HXX
R2 (V) R2 (V) R2 (V) R2 (V) R2 (V) R2 (V) R2 (V)
CMOS
@ 5V
NON-INV. 2000 1000 2200 750 1000 1000 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