1FEATURES

· Designed for INTERBUS Applications

· Balanced Receiver Thresholds

· 1/2 Unit-Load (up to 64 nodes on the bus)

· Bus-Pin ESD Protection 15 kV HBM

· Bus-Fault Protection of –7V to 12V

· Thermal Shutdown Protection

· Power-Up/Down Glitch-free Bus Inputs and

Outputs

· Designed for RS-422 and RS-485 Networks

APPLICATIONS

· Digital Motor Control

· Utility Meters

· Chassis-to-Chassis Interconnections

· Electronic Security Stations

· Industrial, Process, and Building Automation

· Point-of-Sale (POS) Terminals and Networks

· DTE/DCE Interfaces

DESCRIPTION

The SN65HVD179 is a differential line driver and

differential-input line receiver that operates with a 5-V

power supply. Each driver and receiver has separate input and output pins for full-duplex bus

communication designs. They are designed for

balanced transmission lines and interoperation with

ANSI TIA/EIA-485A, TIA/EIA-422-B, ITU-T v.11, and ISO 8482:1993 standard-compliant devices.

The differential bus driver and receiver are monolithic, integrated circuits designed for full-duplex

bi-directional data communication on multipoint

bus-transmission lines at signaling rates(1) up to 25

Mbps. The SN65HVD179 is fully enabled with no

external enabling pins.

The 1/2 unit load receiver has a high receiver input

resistance. This results in lower bus leakage currents

over the common-mode voltage range, and reduces

the total amount of current that a 485 driver is forced

to source or sink when transmitting.

The balanced differential receiver input threshold

makes the SN65HVD179 fully compatible with

fieldbus requirements that define an external failsafe

structure.