Avago Technologies ACPL-224-500E - Manual (Page 27)

AV02-4387EN 24 Avago Technologies
Performance of Circuit
• Typical optocoupler signaling
rate: greater than 10 MBd
• Typical optocoupler propagation
delay: 28 ns
• Typical optocoupler pulse­width
distortion: 2 ns
Benefits
• Low signal distortion
• Good transient immunity
Alternative Avago Parts
1) HCPL-2400/30 High Speed Opto-
coupler
2) HCPL-7721/7720/7710 High
Speed CMOS Optocoupler
3) HCPL-54XX Hermetically Sealed
High Speed Optocoupler
4) HCPL-0721/0720/0710 SO-8 High
Speed CMOS Optocoupler
5) HCPL-260L/263L 3.3V Optocou-
plers
Description
The above isolated RS-485 interface
circuit uses the HCPL-26XX High
Speed CMOS optocoupler, which
can transmit digital signals faster
than 10 MBd. An isolated 5 V power
supply is required to power the
RS-485 bus side of the circuit.
Isolated RS-485 Bus Interface
Data Communications Applications
RS-485
LINE
DR/RX
RS-485
LINE
DRIVER
RECEIVER
HCPL-2631
TERMINATION
DATA IN
ENABLE
DATA OUT
DATA IN
ENABLE
VCC
DATA OUT
GND
VCC
GND 1
ISOLATION
TERMINATION
DS75176A
DS75176A
+5 V
ISOLATED
SUPPLY
+5 V COMMON
HCPL-2631
HCPL-2601
HCPL-2601
RS-485 BUS