Fig. 16 Logic Low Supply Current vs.
Input Diode Forward Current
(6N138 / 6N139 Only)
Fig. 17 Logic Low Supply Current vs.
Input Diode Forward Current
(HCPL-2730 / HCPL-2731 Only)
100
10
1
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
T
= 25˚C
A
HCPL-2731
= 18 V
V
CC
HCPL-2730
HCPL-2731
V
CC
= 5 V
V
CC
= 7 V
V
CC
= 18 V
0.1
0
2
4
6
8
10
12
14
16
0.1
1
10
100
I
F
- FORWARD CURRENT (mA)
I
F
- INPUT DIODE FORWARD CURRENT - mA
Fig. 18 Propagation Delay vs. Input Diode Forward Current
(6N138 / 6N139 Only)
Fig. 19 Propagation Delay vs. Input Diode Forward Current
(HCPL-2730 / HCPL-2731 Only)
70
70
V
= 5 V
V
= 5 V
CC
= 25˚C
CC
T = 25˚C
A
T
A
60
50
40
30
20
10
0
60
50
40
30
20
10
0
(t
PHL
) R = 2.2 kΩ or 4.7 kΩ
(t
) R = 2.2 kΩ or 4.7 kΩ
PHL
L
L
(t
) R = 4.7 kΩ
PLH
L
(t
PLH
) R = 4.7 kΩ
L
(t
) R = 2.2 kΩ
PLH
L
(t
) R = 2.2 kΩ
PLH
L
0
2
4
6
8
10
0
1
2
3
4
5
6
7
8
9
10
I
F
- INPUT DIODE FORWARD CURRENT - mA
I - INPUT DIODE FORWARD CURRENT - mA
F
Fig. 21 Propagation Delay to Logic Low vs. Pulse Period
(HCPL-2730 / HCPL-2731 Only)
Fig. 20 Propagation Delay to Logic Low vs. Pulse Period
(6N138 / 6N139 Only)
100
10
1
100
6N139
I
= 0.5 mA
F
R
L
= 4.7 kΩ
HCPL-2731
= 0.5 mA
I
F
R
L
= 4.7 kΩ
10
6N138
= 1.6 mA
I
F
R
L
= 2.2 kΩ
1
HCPL-2730
HCPL-2731
I
R
=1.6 mA
F
T = 25˚C
A
= 2.2kΩ
L
T
A
= 25˚C
0.1
0.01
0.1
0.1
1
10
0.01
0.1
1
10
T - INPUT PULSE PERIOD - ms
T - INPUT PULSE PERIOD - ms
9
www.fairchildsemi.com
Single-Channel: 6N138, 6N139 Dual-Channel: HCPL-2730, HCPL-2731 Rev. 1.0.0
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
