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THVD4431

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Dual-protocol RS-232(3T/5R)/RS-485(1T/1R) transceiver

Product details

Protocols RS-232, RS-422, RS-485 Drivers per package 3 (RS-232) Receivers per package 5 (RS-232) Logic voltage (min) (V) 1.65 Main supply voltage (nom) (V) 3.3 Data rate (max) (Mbps) 1 ESD HBM (kV) 16 Features Fail Safe Protection, Slew Rate Control, Switchable termination resistor Operating temperature range (°C) -40 to 125
Protocols RS-232, RS-422, RS-485 Drivers per package 3 (RS-232) Receivers per package 5 (RS-232) Logic voltage (min) (V) 1.65 Main supply voltage (nom) (V) 3.3 Data rate (max) (Mbps) 1 ESD HBM (kV) 16 Features Fail Safe Protection, Slew Rate Control, Switchable termination resistor Operating temperature range (°C) -40 to 125
VQFN (RHA) 40 36 mm² 6 x 6
  • Meets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-232F standards
  • 3 transmitters, 5 receivers for RS-232
  • 1 transmitter, 1 receiver for RS-485
  • On-chip switchable 120-Ω termination resistor for RS-485 mode
  • Integrated charge-pump for RS-232 signaling
  • 3-V to 5.5-V supply voltage
  • 1.65 V to 5.5 V supply for logic data and control signals
  • RS-485 differential output exceeds 2.1 V for PROFIBUS compatibility with 5-V supply
  • Large output swing (typical ± 9V) for RS-232 mode
  • SLR Pin Selectable Data Rates:
    • RS-232 3T5R mode: 250 kbps and 1 Mbps
    • RS-485 half-duplex and full-duplex mode: 500 kbps and 20 Mbps
  • Bus I/O protection
    • ±16-kV HBM ESD
    • ±8-kV IEC 61000-4-2 contact and ±15-kV air-gap discharge
    • ±4-kV IEC 61000-4-4 fast transient burst
  • Diagnostic loopback for both RS-232 and RS-485 modes
  • Shutdown pin for low current consumption (10 µA typical) in disabled state
  • Glitch-free power-up/down for hot plug-in capability
  • 1/8 unit load (up to 256 bus nodes) for RS-485
  • Open, short, and idle bus failsafe for RS-485 receiver
  • Bus short-circuit protection, thermal shutdown
  • Extended ambient temperature range: -40°C to 125°C
  • Space-saving thermally efficient 6 mm x 6 mm VQFN-40 package
  • Meets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-232F standards
  • 3 transmitters, 5 receivers for RS-232
  • 1 transmitter, 1 receiver for RS-485
  • On-chip switchable 120-Ω termination resistor for RS-485 mode
  • Integrated charge-pump for RS-232 signaling
  • 3-V to 5.5-V supply voltage
  • 1.65 V to 5.5 V supply for logic data and control signals
  • RS-485 differential output exceeds 2.1 V for PROFIBUS compatibility with 5-V supply
  • Large output swing (typical ± 9V) for RS-232 mode
  • SLR Pin Selectable Data Rates:
    • RS-232 3T5R mode: 250 kbps and 1 Mbps
    • RS-485 half-duplex and full-duplex mode: 500 kbps and 20 Mbps
  • Bus I/O protection
    • ±16-kV HBM ESD
    • ±8-kV IEC 61000-4-2 contact and ±15-kV air-gap discharge
    • ±4-kV IEC 61000-4-4 fast transient burst
  • Diagnostic loopback for both RS-232 and RS-485 modes
  • Shutdown pin for low current consumption (10 µA typical) in disabled state
  • Glitch-free power-up/down for hot plug-in capability
  • 1/8 unit load (up to 256 bus nodes) for RS-485
  • Open, short, and idle bus failsafe for RS-485 receiver
  • Bus short-circuit protection, thermal shutdown
  • Extended ambient temperature range: -40°C to 125°C
  • Space-saving thermally efficient 6 mm x 6 mm VQFN-40 package

THVD4431 is a highly integrated and robust Multiprotocol transceiver supporting RS-232, RS-422 and RS-485 physical layers. The device has three transmitters and five receivers to enable 3T5R RS-232 port. The device also integrates one transmitter and one receiver to enable half and full duplex RS-485 port. MODE selection pins enable shared bus and logic pins for the protocols to share a common single connector. Integrated termination for RS-485 bus pins and for RS-232 receiver inputs need no external components to realize a fully-functional communication port. The device has a slew rate select feature that enables it for use at two maximum speeds based on the SLR pin setting.

The device features integrated Level 4 IEC ESD protection, eliminating the need for external system-level protection components. Diagnostic loopback mode for both RS-232 and RS-485 is provided to check for logic to bus and bus to logic path functional integrity and check for cable and connector shorts. In addition, the RS-485 receiver fail-safe feature drives logic high on received logic output when the bus inputs are open or shorted together or when the bus is idle. Shutdown mode consumes ultra-low current (10 µA typical) ideal for power-sensitive applications. The device needs 3 to 5.5 V supply that powers the charge pump for RS-232 and the drivers/receivers for both RS-232 and RS-485. A separate logic supply V IO (1.65 V to 5.5 V) enables interface with low level microcontrollers.

THVD4431 is a highly integrated and robust Multiprotocol transceiver supporting RS-232, RS-422 and RS-485 physical layers. The device has three transmitters and five receivers to enable 3T5R RS-232 port. The device also integrates one transmitter and one receiver to enable half and full duplex RS-485 port. MODE selection pins enable shared bus and logic pins for the protocols to share a common single connector. Integrated termination for RS-485 bus pins and for RS-232 receiver inputs need no external components to realize a fully-functional communication port. The device has a slew rate select feature that enables it for use at two maximum speeds based on the SLR pin setting.

The device features integrated Level 4 IEC ESD protection, eliminating the need for external system-level protection components. Diagnostic loopback mode for both RS-232 and RS-485 is provided to check for logic to bus and bus to logic path functional integrity and check for cable and connector shorts. In addition, the RS-485 receiver fail-safe feature drives logic high on received logic output when the bus inputs are open or shorted together or when the bus is idle. Shutdown mode consumes ultra-low current (10 µA typical) ideal for power-sensitive applications. The device needs 3 to 5.5 V supply that powers the charge pump for RS-232 and the drivers/receivers for both RS-232 and RS-485. A separate logic supply V IO (1.65 V to 5.5 V) enables interface with low level microcontrollers.

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* Data sheet THVD4431 Multiprotocol (RS-232, RS-422, RS485) Transceiver with Integrated120-Ω Switchable Termination Resistor and IEC-ESD Protection datasheet (Rev. A) PDF | HTML 22 Nov 2023
EVM User's guide THVD4431EVM, THVD4431 Evaluation Module User's Guide PDF | HTML 30 Jun 2023

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Evaluation board

THVD4431EVM — THVD4431 evaluation module for multi-protocol (RS-232 (3T5R) and RS-485/RS-422)

The THVD4431EVM provides a quick way to evaluate TI’s THVD4431, a RS-485/RS-232 multiprotocol transceiver that supports full and half duplex RS-485 as well as 3T5R RS-232 configurations. It also supports loopback modes for both RS-232 and RS-485 to allow for on-chip diagnostic testing.

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