Features
• ESD protection
– – ±15 kV human body model
– – ±8 kV IEC 1000-4-2 contact discharge
• Operates from a single 3.3 V supply - no charge pump required
• Interoperable with 5 V logic
• 1 μA low current shutdown mode max.
• Guaranteed 12 Mbps data rate
• -7 to 12 common mode input voltage range
• Half duplex versions available
• Industry standard 75176 pinout
• Current limiting and thermal shutdown for driver overload protection
• Guaranteed high receiver output state for floating, shorted or terminated inputs
with no signal present
• Allows up to 64 transceivers on the bus

Description
The ST1480US is ±15 kV ESD protected, 3.3 V low power transceiver for RS-485
and RS-422 communications. The device contains one driver and one receiver in half
duplex configuration. The ST1480US transmits and receives at a guaranteed data
rate of at least 12 Mbps. All transmitter outputs and receiver inputs are protected
to ±15 kV using human body model. Driver is short-circuit current limited and is
protected against excessive power dissipation by thermal shutdown circuitry that
places the driver outputs into a high-impedance state.
The ST1480US input has a true fail-safe feature that guarantees a logic high output if
both inputs are open circuit, shorted together or in the presence of a termination with
no signal on the bus.