HCPL-7721-560 Avago Technologies US Inc., HCPL-7721-560 Datasheet - Page 17

• 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

DRAIN/SHIELD
DRAIN/SHIELD
Figure 19. Isolated node with transceiver powered by the network.
Isolated Node Providing Power to the Network
Figure 20 shows a node providing power to the network.
The AC line powers a regulator which provides five (5)
volts locally. The AC line also powers a 24 volt isolated
supply, which powers the network, and another five-volt
regulator, which, in turn, powers the transceiver and iso-
lated (network) side of the two optocouplers. This meth-
od is recommended when there are a limited number of
devices on the network that don’t require much power,
thus eliminating the need for separate power supplies.
Figure 20. Isolated node providing power to the network.
17
SIGNAL
POWER
SIGNAL
POWER
NETWORK
SUPPLY
POWER
DEVICENET NODE
772x/072x
772x/072x
NODE/APP SPECIFIC
HCPL
NODE/APP SPECIFIC
HCPL
TRANSCEIVER
TRANSCEIVER
uP/CAN
* OPTIONAL FOR BUS V + SENSE
uP/CAN
HCPL-0710 fig 19
772x/072x
772x/072x
HCPL
HCPL
HCPL-0710 fig 20
5 V REG.
5 V REG.
772x/072x
NON ISO
*HCPL
REG.
5 V
AC LINE
SWITCHING
ISOLATED
SUPPLY
POWER
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
More importantly, the unique “dual-inverting” design of
the HCPL-772X/072X ensure the network will not “lock-
up” if either AC line power to the node is lost or the node
powered-off. Specifically, when input power (V
HCPL-772X/072X located in the transmit path is eliminat-
ed, a RECESSIVE bus state is ensured as the HCPL-772X/
072X output voltage (V
AC LINE
GALVANIC
ISOLATION
BOUNDARY
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
GALVANIC
ISOLATION
BOUNDARY
O
) go HIGH.
DD1
) to the