LOW INPUT CURRENT
HIGH GAIN SPLIT
DARLINGTON OPTOCOUPLERS
SINGLE-CHANNEL
6N138
6N139
ELECTRICAL CHARACTERISTICS
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
(T
A
= 25°C unless otherwise specified)
DUAL-CHANNEL
HCPL-2730
HCPL-2731
INPUT
OUTPUT
CMOS CMOS
74XX 74LXX 74SXX 74LSXX 74HXX
@ 5 V @ 10 V
R2 ($) R2 ($) R2 ($) R2 ($) R2 ($) R2 ($) R2 ($)
Where:
V
DD1
- Input Supply Voltage
V
DD2
- Output Supply Voltage
V
DF
- Diode Forward Voltage
V
OL1
- Logic “0” Voltage of Driver
V
OH1
- Logic “1” Voltage of Driver
I
F
- Diode Forward Current
V
OLX
- Saturation Voltage of
Output Transistor
I
L
- Load Current Through
Resistor R2
I
2
- Input Current of Output Gate
NON-INV.
INV.
NON-INV.
INV.
NON-INV.
74XX
INV.
NON-INV.
74LXX
INV.
NON-INV.
74SXX
INV.
NON-INV.
74LSXX
INV.
NON-INV.
74HXX
INV.
CMOS
@5V
CMOS
@ 10 V
R1 ($)
2000
510
5100
4700
2200
180
1800
100
2000
360
2000
180
2000
180
1000
2200
750
1000
1000
1000
560
Fig. 1 Resistor Values for Logic Interface
V
DD1
V
DD2
V
DD2
1
2
3
IN
R
1
8
7
6
OUT
R
1
R
2
IN
1
2
3
4
8
7
6
5
R
2
OUT
4
5
Fig. 2 Non-Inverting Logic Interface
Fig. 3 Inverting Logic Interface
12/27/99
200023A
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
