The ISO1176 device is an isolated differential line transceiver designed for use in
PROFIBUS applications. The device is ideal for long transmission lines because the ground loop is
broken to provide for operation with a much larger common-mode voltage range. The symmetrical
isolation barrier of each device is tested to provide 2500 VRMS of isolation
per UL between the line transceiver and the logic level interface.
The galvanically isolated differential bus transceiver is an integrated circuit designed
for bidirectional data communication on multipoint bus-transmission lines. The transceiver combines
a galvanically isolated differential line driver and differential input line receiver. The driver
has an active-high enable with isolated enable-state output on the ISODE pin (pin 10) to facilitate
direction control. The driver differential outputs and the receiver differential inputs connect
internally to form a differential input/output (I/O) bus port that is designed to offer minimum
loading to the bus allowing up to 160 nodes.
The PV pin (pin 7) is provided as a full-chip enable option. All device outputs become
high impedance when a logic low is applied to the PV pin. For more information, see the function
tables in Device Functional Modes.
Any cabled I/O can be subjected to electrical noise transients from various sources.
These noise transients can cause damage to the transceiver and/or nearby sensitive circuitry if
they are of sufficient magnitude and duration. The ISO1176 can significantly reduce the risk of
data corruption and damage to expensive control circuits.
The device is characterized for operation over the ambient temperature range of 40°C to