HCPL-2731 Datasheet, PDF (6/15 Pages) Fairchild Semiconductor – LOW INPUT CURRENT HIGH GAIN SPLIT DARLINGTON OPTOCOUPLERS

Electrical Characteristics (T_A = 25°C unless otherwise specified)
Current Limiting Resistor Calculations
R₁ (Non-Invert) = V_DD1 - V_DF - V_OL1
I_F
R₁ (Invert) = V_DD1 - V_OH1 - V_DF
I_F
R₂ = V_DD2 - = V_OLX (@ I_L - I₂)
I_L
OUTPUT
INPUT
R1 (V)
CMOS
@ 5V
CMOS
@ 10 V
74XX
74LXX
74SXX
74LSXX
74HXX
R2 (V) R2 (V) R2 (V) R2 (V) R2 (V)
CMOS NON-INV. 2000 1000 2200 750 1000 1000
@5V
INV.
510
R2 (V)
1000
R2 (V)
560
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
CMOS NON-INV. 5100
@ 10 V _{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
I_L - Load Current Through
Resistor R2
I₂ - Input Current of Output Gate
INV. 180
Fig. 1 Resistor Values for Logic Interface
V_DD1
V_DD2
V_DD2
1
2
3
IN
R₁
4
8
7
R₂
6
5
1
IN
2
OUT
3
R₁
4
8
7
R₂
6
OUT
5
Fig. 2 Non-Inverting Logic Interface
Fig. 3 Inverting Logic Interface
6
Single-Channel: 6N138, 6N139 Dual-Channel: HCPL-2730, HCPL-2731 Rev. 1.0.0
www.fairchildsemi.com