描述 Description

THVD4411 is a highly integrated and robust multiprotocol transceiver supporting RS-232, RS-422 and RS-485 physical layers. The device has one transmitter and one receiver to enable 1T1R RS-232 port. 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 are provided so no external components are needed to realize a fully-functional communication port. These devices have slew rate select feature that enables them to be used at two maximum speeds based on the SLR pin setting.

These devices feature integrated Level 4 IEC ESD protection, eliminating the need for external system-level protection components. 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) in power-sensitive applications. The device needs 3V to 5.5V supply that powers the charge pump for RS-232 and the drivers and receivers for both RS-232 and RS-485. A separate logic supply VIO (1.65V to 5.5V) enables interface with low level microcontrollers.

特性 Features

Meets or exceeds the requirements of the TIA/EIA-485A and TIA/EIA-232F standards

1 transmitter, 1 receiver for RS-232

1 transmitter, 1 receiver for RS-485

On-chip switchable 120Ω termination resistor for RS-485 mode

Integrated charge-pump for RS-232 signaling

3V to 5.5V supply voltage

1.65V to 5.5V supply for logic data and control signals

RS-485 differential output exceeds 2.1V for PROFIBUS compatibility with 5V supply

Large output swing (typical ± 9V) for RS-232 mode

SLR Pin Selectable Data Rates:

RS-232 3T5R mode: 250kbps and 1Mbps

RS-485 half-duplex and full-duplex mode: 500kbps and 20Mbps



Bus I/O protection

±16kV HBM ESD

±8kV IEC 61000-4-2 contact and ±15kV air-gap discharge

±4kV IEC 61000-4-4 fast transient burst



Shutdown pin for extremely low current consumption (10μA 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 4mm x 4mm VQFN-24 package