HCPL-0721-300 Avago Technologies US Inc., HCPL-0721-300 Datasheet - Page 14
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HCPL-0721-300
Manufacturer Part Number
HCPL-0721-300
Description
Manufacturer
Avago Technologies US Inc.
Datasheet
1.HCPL-0721-300.pdf
(19 pages)
Specifications of HCPL-0721-300
Number Of Elements
1
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
Optical Isolation for Field Bus Networks
To recognize the full benefits of these networks, each
recommends providing galvanic isolation using Avago
optocouplers. Since network communication is bi-direc-
tional (involving receiving data from and transmitting
data onto the network), two Avago optocouplers are
needed. By providing galvanic isolation, data integrity is
retained via noise reduction and the elimination of false
signals. In addition, the network receives maximum pro-
tection from power system faults and ground loops.
Within an isolated node, such as the DeviceNet Node
shown in Figure 16, some of the node’s components are
referenced to a ground other than V- of the network.
14
DRAIN/SHIELD
Figure 16. Typical DeviceNet Node.
SIGNAL
POWER
NETWORK
SUPPLY
POWER
772x/072x
NODE/APP SPECIFIC
HCPL
TRANSCEIVER
uP/CAN
HCPL-0710 fig 17
772x/072x
HCPL
5 V REG.
SUPPLY
LOCAL
NODE
AC LINE
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
GALVANIC
ISOLATION
BOUNDARY
These components could include such things as devices
with serial ports, parallel ports, RS232 and RS485 type
ports. As shown in Figure 16, power from the network is
used only for the transceiver and input (network) side of
the optocouplers.
Isolation of nodes connected to any of the three types of
digital field bus networks is best achieved by using the
HCPL-772X/072X optocouplers. For each network, the
HCPL-772X/072X satisify the critical propagation delay
and pulse width distortion requirements over the tem-
perature range of 0°C to +85°C, and power supply volt-
age range of 4.5 V to 5.5 V .