HCPL-7721 Avago Technologies US Inc., HCPL-7721 Datasheet - Page 19

• Manufacturer Part Number: HCPL-7721
• Description: OPTOCOUPLER CMOS 25MBD 8-DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of HCPL-7721

• Voltage - Isolation: 3750Vrms
• Number Of Channels: 1, Unidirectional
• Current - Output / Channel: 10mA
• Data Rate: 25MBd
• Propagation Delay High - Low @ If: 20ns
• Input Type: Logic
• Output Type: Push-Pull, Totem-Pole
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• No. Of Channels: 1
• Isolation Voltage: 3.75kV
• Optocoupler Output Type: Gate Drive
• Input Current: 10µA
• Output Voltage: 5V
• Opto Case Style: DIP
• No. Of Pins: 8
• Propagation Delay Low-high: 40ns
• Common Mode Voltage Vcm: 1000V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 516-1110-5

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
compatible with CMOS logic level signals, the optocoup-
ler is connected directly to the transceiver. Two bypass
capacitors (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 be-
tween both ends of the capacitor and the power supply
pins should not exceed 20 mm. The bypass capac itors
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 in the United States and other countries.
Data subject to change. Copyright © 2005-2011 Avago Technologies. All rights reserved. Obsoletes AV01-0565EN
AV02-0876EN - March 15, 2011
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
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
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
(1 kV/μs at V
RT
+
SHIELD
–
1 M
CM
= 1000 V) es-