F81433A
General Description

The F81433A is a programmable, monolithic multi-protocol 1T/1R transceiver supporting RS-232 and RS-485 / RS-422 drivers and receivers in a 28 pin QFN package.

Integrated cable termination and four configuration modes allow all three protocols to be used interchangeably over a single cable or connector with no additional switching components. Full operation requires only four external charge pump capacitors (0.1μF).

The F81433A can be reconfigured into four operating modes including 1T/1R RS-232, 1T/1R RS-422 full duplex with termination resistor and bias resistor, 1T/1R RS-485 half duplex with termination resistor, bias resistor and auto sensing, low power shutdown.

The high-speed drivers operate up to 20Mbps in RS-485/RS-422 modes (Max. Load 47pF), and up to 3 Mbps in RS-232 mode (Max. Load 100pF). All drivers can be slew limited to 250kbps in any mode to minimize Electromagnetic Interference (EMI).

The RS-232 receiver inputs include a 5kΩ pull-down to ground. The RS-485/RS-422 receiver inputs are high impedance (>96kΩ when termination is disabled), allowing up to 256 devices on a single communication bus (1/8th unit load).

The F81433A operates from a single power supply, either 3.3V or 5V, with low idle current (5mA typical in RS-232 and 10mA typical in RS-422/RS-485). The shutdown mode consumes less than 30μA for low power standby operation. I/O power (minimum 1.8V) is for the controller side’s power.

  • FEATURES
  • PACKAGE
  • ATTACHMENTS

◼ 3.3V ~ 5V Single Supply Operation

◼ Support I/O Power 1.8 to 5.0V

◼ RS 232 Data Rate 3Mbps (Max. Load 100pF)

◼ RS 422/485 Data Rate 20Mbps (Max. Load 47pF)

◼ Adjustable Slew Rate for Minimize EMI Error

◼ RS-485 Advance Failsafe on Open, Short or Terminated Lines

◼ No External Biasing Resistors Are Required for RS-422/485

◼ Provide shutdown function

◼ Flexible 4 Operation Modes Selected by 2 Configuration Pins for F81433A

A. 1T1R RS-232

B. 1T1R RS-485 with termination resistor and bias resistor. TX enable low active with auto sensing

C. 1T1R RS-422 with termination resistor and bias resistor

D. Low power shutdown. All I/O pins are high impedance

◼ Nominal ±10V Driving Output Swing for +5V lnput

◼ ±16.5V Receiver Input Voltage Range

◼ 28 QFN (4 mm x 4 mm) Package

28 QFN (4 mm x 4 mm)
If you are interested in obtaining the most updated information, please contact us at marketing@fintek.com.tw
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