1 Features

• Meets or exceeds the requirements of the TIA/

EIA-485A standard

• 3-V to 5.5-V bus supply voltage

• 1.65 V to 5.5 V supply for logic signals

• Differential output exceeds 2.1 V for PROFIBUS

compatibility with 5-V supply

• Pin configurable Half-duplex and full-duplex

• Pin controlled on-chip 120 Ω termination resistor

on bus pins

• Maximum Data rate configurable

– SLR = High: 500 kbps

– SLR = Low or floating: 20 Mbps

• Bus I/O protection

– ±16-kV HBM ESD

– ±8-kV IEC 61000-4-2 Contact discharge

– ±15-kV IEC 61000-4-2 Air gap discharge

– ±4-kV IEC 61000-4-4 Fast transient burst

– ±16-V bus fault protection (absolute max

voltage on bus pins)

• Extended industrial temperature range:

-40°C to 125°C

• Low power consumption

– Shutdown supply current < 5 μA

– Quiescent current during operation < 3 mA

• Glitch-free power-up/power-down for hot plug-in

capability

• Open, short, and idle bus failsafe

• Small, space-saving 16-VQFN (3 mm x 3 mm)

package

2 Applications

• Factory automation & control

• Building automation

• Industrial transport

• HVAC systems

• Smart meters

• Lighting

• Grid Infrastructure

3 Description

The THVD1424 is a flexible RS-485 transceiver

for industrial applications. The device has features

such as on-chip 120-Ω termination resistor, slew rate

control and interchangeability between half and full

duplex mode. All the features are pin-controlled. This

enables the device to be used at any node location

(end nodes or middle nodes) in any network, twowire

(half duplex) or 4-wire (full duplex), slow or

fast. End-equipment designers can now design a

common printed circuit board (PCB) and configure it

via software for various application needs. This can

save considerable design and qualification time for

the customers.

The bus pins are immune to high levels of IEC

Contact Discharge ESD events, eliminating the need

for additional system level protection components.

The device operates from 3 to 5.5-V bus supply, while

the logic supply voltage range is 1.65 V to 5.5 V.

The wide common-mode voltage range and low input

leakage on bus pins makes the devices suitable for

multi-point applications over long cable runs.

The device is available in a space-saving, thermally

efficient 16-pin VQFN package. The device is

characterized for ambient temperatures from –40°C to

125°C.