HCPL-0721-500 Avago Technologies US Inc., HCPL-0721-500 Datasheet - Page 19

• Manufacturer Part Number: HCPL-0721-500
• Manufacturer: Avago Technologies US Inc.

Specifications of HCPL-0721-500

• Number Of Elements: 1
• Forward Voltage: 5.5V
• Output Current: 10mA
• Package Type: SOIC
• Operating Temp Range: -40C to 85C
• Power Dissipation: 150mW
• Propagation Delay Time: 40ns
• Pin Count: 8
• Mounting: Surface Mount
• Operating Temperature Classification: Industrial
• Output Type: Push-Pull
• Isolation Voltage: 3750Vrms
• Lead Free Status / RoHS Status: Not Compliant

Tx ENABLE
Figure 23. Recommended PROFIBUS application circuit.
Power Supplies and Bypassing
The recommended PROFIBUS application circuit is shown
in Figure 23. Since the HCPL-772X/072X are fully com-
patible with CMOS logic level signals, the optocoupler is
connected directly to the transceiver. Two bypass capac-
itors (with values between 0.01 and 0.1 µF) are required
and should be located as close as possible to the input
and output power-supply pins of the HCPL-772X/072X.
For each capacitor, the total lead length between both
ends of the capacitor and the power supply pins should
not exceed 20 mm. The bypass capacitors are required
because of the high-speed digital nature of the signals
inside the optocoupler.
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Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies Limited in the United States and other countries.
Data subject to change. Copyright © 2005-2008 Avago Technologies Limited. All rights reserved. Obsoletes AV01-0565EN
AV02-0876EN - June 10, 2008
Rx
Tx
0.01 µF
0.01 µF
1, 0 kΩ
5 V
5 V
5 V
8
7
6
5
1
2
3
4
1
2
3
4
V
V
GND
V
V
GND
ANODE
CATHODE
DD2
O
DD1
IN
BOUNDARY
HCPL-061N
HCPL-772x
HCPL-072x
HCPL-772x
HCPL-072x
ISOLATION
GALVANIC
2
1
GND
GND
GND
V
V
V
CC
V
DD1
DD2
V
V
V
O
E
IN
O
1
2
8
7
6
5
1
2
3
4
8
7
6
5
ISO 5 V
0.01
ISO 5 V
ISO 5 V
µF
HCPL-0710 fig 23
0.01
0.01
µF
µF
680 Ω
0.01
µF
www.avagotech.com
Being very similar to multi-station RS485 systems, the
HCPL-061N optocoupler provides a transmit disable
function which is necessary to make the bus free after
each master/slave transmission cycle. Specifically, the
HCPL-061N disables the transmitter of the line driver by
putting it into a high state mode. In addition, the HCPL-
061N switches the RX/TX driver IC into the listen mode.
The HCPL-061N offers HCMOS compatibility and the
high CMR performance (1 kV/µs at V
sential in industrial communication interfaces.
1
4
3
2
R
D
DE
RE
SN75176B
ISO 5 V
GND
V
CC
8
5
A
B
6
7
0.01 µF
RT
+
SHIELD
–
1 M
CM
= 1000 V) es-