SN65HVD21DRG4.A中文资料德州仪器数据手册PDF规格书

1 Features

• Common-mode voltage range (–20 V to 25 V)

more than doubles TIA/EIA-485 requirement

• Receiver equalization extends cable length,

signaling rate (SN65HVD2[3,4])

• Reduced unit-load for up to 256 nodes

• Bus I/O protection to over 16-kV HBM

• Failsafe receiver for open-circuit, short-circuit, and

idle-bus conditions

• Low standby supply current 1 μA (maximum)

• More than 100 mV receiver hysteresis

2 Applications

• Long cable solutions

– Factory automation

– Security networks

– Building HVAC

• Severe electrical environments

– Electrical power inverters

– Industrial drives

– Avionics

3 Description

The transceivers in the SN65HVD2x family offer

performance far exceeding typical RS-485 devices.

In addition to meeting all requirements of the

TIA/EIA‑485-A standard. The SN65HVD2x family

operates over an extended range of common-mode

voltages and has features such as high ESD

protection, wide receiver hysteresis, and failsafe

operation. This family of devices is designed for longcable

networks, and other applications where the

environment is too harsh for ordinary transceivers.

These devices are designed for bidirectional data

transmission on multipoint twisted-pair cables.

Example applications are digital motor controllers,

remote sensors and terminals, industrial process

control, security stations, and environmental control

systems.

These devices combine a 3-state differential driver

and a differential receiver that operate from a single

5-V power supply. The driver differential outputs and

the receiver differential inputs are connected internally

to form a differential bus port that offers minimum

loading to the bus. This port features an extended

common-mode voltage range, making the device

suitable for multipoint applications over long cable

runs.