Avago Technologies ACPL-224-500E - Manual (Page 23)

AV02-4387EN 20 Avago Technologies
Performance of Circuit
• Minimum optocoupler LED turn­
on current: 0.5 mA (The HCPL-
4701 optocoupler requires only
40 µA)
• Typical signaling rate: dc to 100
kBd
• Minimum optocoupler current
transfer ratio: 400%
Benefits
• Low power consumption
• Simple interface
Alternative Avago Parts
1) HCPL-4701 Very Low Power High
Gain Optocoupler
2) HCPL-2730/1 Dual Channel High
Gain Optocoupler
3) HCPL-0731 Small Outline High
Gain Optocoupler
4) HCPL-57XX, HCPL-67XX, 6N140
Hermetically Sealed High Gain
Optocoupler
5) HCPL-270L 3.3V Optocoupler
Low Power 100 kBd CMOS Interface
Description
A CMOS-to-CMOS interface is pos-
sible with Avago opto-couplers. The
above circuit shows a cost-effective
interface for 100 kBd applications.
The 74HCT04 CMOS Hex Inverter
that drives the optocoupler LED can
source and sink up to 4 mA current.
The 6N139 optocoupler requires
only 0.5 mA LED current for opera-
tion. The signal diode across resistor
R
1
protects against common-mode
transient voltages and is optional.
The output circuit uses a 74HCT08
so that the signal from V
IN
to V
OUT
is
not inverted.
Digital Logic Interface/Level Shifting Applications
V
OUT
I
F
7
5
6
8
2
3
4
1
* USE ANY SIGNAL DIODE FOR CMR PROTECTION
IN
V
1
R
1/6 74HCTO4
1
R = V - V OH F
4.7 k Ω
*
1/4 74HC/HCT08
6N139