Catalog
Dual-protocol RS-232(3T/5R)/RS-485(1T/1R) transceiver
Key Features
• Meets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-232F standards3 transmitters, 5 receivers for RS-2321 transmitter, 1 receiver for RS-485On-chip switchable 120Ω termination resistor for RS-485 modeIntegrated charge-pump for RS-232 signaling3V to 5.5V supply voltage1.65V to 5.5V supply for logic data and control signalsRS-485 differential output exceeds 2.1V for PROFIBUS compatibility with 5V supplyLarge output swing (typical ± 9V) for RS-232 modeSLR Pin Selectable Data Rates:RS-232 3T5R mode: 250kbps and 1MbpsRS-485 half-duplex and full-duplex mode: 500kbps and 20MbpsBus I/O protection±16kV HBM ESD±8kV IEC 61000-4-2 contact and ±15kV air-gap discharge±4kV IEC 61000-4-4 fast transient burstDiagnostic loopback for both RS-232 and RS-485 modesShutdown pin for low current consumption (10µA typical) in disabled stateGlitch-free power-up/down for hot plug-in capability1/8 unit load (up to 256 bus nodes) for RS-485Open, short, and idle bus failsafe for RS-485 receiverBus short-circuit protection, thermal shutdownExtended ambient temperature range: -40°C to 125°CSpace-saving thermally efficient 6mm x 6mm VQFN-40 packageMeets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-232F standards3 transmitters, 5 receivers for RS-2321 transmitter, 1 receiver for RS-485On-chip switchable 120Ω termination resistor for RS-485 modeIntegrated charge-pump for RS-232 signaling3V to 5.5V supply voltage1.65V to 5.5V supply for logic data and control signalsRS-485 differential output exceeds 2.1V for PROFIBUS compatibility with 5V supplyLarge output swing (typical ± 9V) for RS-232 modeSLR Pin Selectable Data Rates:RS-232 3T5R mode: 250kbps and 1MbpsRS-485 half-duplex and full-duplex mode: 500kbps and 20MbpsBus I/O protection±16kV HBM ESD±8kV IEC 61000-4-2 contact and ±15kV air-gap discharge±4kV IEC 61000-4-4 fast transient burstDiagnostic loopback for both RS-232 and RS-485 modesShutdown pin for low current consumption (10µA typical) in disabled stateGlitch-free power-up/down for hot plug-in capability1/8 unit load (up to 256 bus nodes) for RS-485Open, short, and idle bus failsafe for RS-485 receiverBus short-circuit protection, thermal shutdownExtended ambient temperature range: -40°C to 125°CSpace-saving thermally efficient 6mm x 6mm VQFN-40 package
Description
AI
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 (10µA typical) ideal for power-sensitive applications. The device needs 3 to 5.5V supply that powers the charge pump for RS-232 and the drivers/receivers for both RS-232 and RS-485. A separate logic supply VIO (1.65V to 5.5V) 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 (10µA typical) ideal for power-sensitive applications. The device needs 3 to 5.5V supply that powers the charge pump for RS-232 and the drivers/receivers for both RS-232 and RS-485. A separate logic supply VIO (1.65V to 5.5V) enables interface with low level microcontrollers.
