HCPL-7721-560 Avago Technologies US Inc., HCPL-7721-560 Datasheet - Page 18

• Manufacturer Part Number: HCPL-7721-560
• Manufacturer: Avago Technologies US Inc.

Specifications of HCPL-7721-560

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

Power Supplies and Bypassing
The recommended DeviceNet application circuit is
shown in Figure 21. Since the HCPL-772X/072X are fully
compatible with CMOS logic level signals, the optocoup-
ler is connected directly to the CAN transceiver. Two by-
pass capacitors (with values between 0.01 and 0.1 µF)
are required and should be located as close as possible
Figure 21. Recommended DeviceNet application circuit.
Implementing PROFIBUS with the HCPL-772X/072X
An acronym for Process Fieldbus, PROFIBUS is essentially
a twisted-pair serial link very similar to RS-485 capable
of achieving high-speed communication up to 12 MBd.
As shown in Figure 22, a PROFIBUS Controller (PBC) es-
tablishes the connection of a field automation unit (con-
trol or central processing station) or a field device to
the transmission medium. The PBC consists of the line
transceiver, optical isolation, frame character transmit-
ter/receiver (UART), and the FDL/APP processor with the
interface to the PROFIBUS user.
18
0.01 µF
0.01 µF
TX0
RX0
ISO 5 V
ISO 5 V
GND
1
2
3
4
5
6
7
8
V
V
GND
GND
V
V
DD1
IN
O
DD2
BOUNDARY
HCPL-772x
HCPL-072x
HCPL-772x
HCPL-072x
ISOLATION
GALVANIC
1
2
GND
GND
V
V
DD2
DD1
V
V
IN
O
2
1
8
7
6
5
4
3
2
1
5 V
0.01
0.01
µF
µF
+
HCPL-0710 fig 21
0.01 µF
C4
TxD
Rs
82C250
GND
V
5 V
CC
MEDIUM
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 capacitors
are required because of the high-speed digital nature of
the signals inside the optocoupler.
Figure 22. PROFIBUS Controller (PBC).
PBC
CANH
CANL
RXD
REF
(CENTRAL PROCESSING)
+
OPTICAL ISOLATION
CONTROL STATION
USER INTERFACE
PROFIBUS USER:
OR FIELD DEVICE
HCPL-0710 fig 22
VREF
TRANSCEIVER
PROCESSOR
REGULATOR
FDL/APP
SWITCHING
LINEAR OR
UART
30 V
D1
0.01 µF
500 V
C1
+
5 V+
4 CAN+
3 SHIELD
2 CAN–
1 V–
R1
1 M