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F81438 Datasheet(PDF) 4 Page - Feature Integration Technology Inc. |
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F81438 Datasheet(HTML) 4 Page - Feature Integration Technology Inc. |
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4 / 20 page  F81438 Jan, 2012 V0.11P 4 1 General Description The F81438 is programmable, monolithic multi-protocol transceiver device that contains RS-232 and RS-485 / RS-422 drivers and receivers. The F81438 can be reconfigured into four operating modes including RS-232 only (3TX/5RX), one RS-485 (1TX/1RX) driver (TX) half duplex mode, one RS-485 (1TX/1RX) receiver (RX) half duplex mode, and RS-422 (1TX/1RX) full duplex mode which can be selected whenever you need by changing the logic state of the 2 mode selection pins. The device can implement a dual-mode serial port, mixed mode ports or as an interface signal translator. The extra charge pumps deliver true RS-232 driver output voltage from a single power supply at 5V. A slew rate control pin configures driver outputs for either high data rate or slew-controlled data rates. Slew-controlled outputs minimize the problems that caused by the reflections and ringing on long or un-terminated cables. All RS-485 receivers or transceivers feature high impedance which allow up to 256 transceivers on a shared bus. When configured in RS-485/RS-422 mode, each driver may be individually enabled or put into tri-state, simplifying use on shared buses or bidirectional communication. All receivers have advanced failsafe protection to prevent oscillation when inputs are un - connected. In RS-232 mode each receiver input has a 5kΩ pull-down to ground. Differential Receivers will default to output logic 1 if inputs are floating, shorted or open but terminated. All driver outputs and receiver inputs are protected against ESD strikes up to ±15,000 volts (IEC 61000-4-2 Air Gap). 2 Feature List 5V Single Supply Operation Robust ±15kV ESD Protection (IEC 61000-4-2 Air Gap) Mixed RS-232 / RS-485 Modes Adjustable Slew Rate for Minimize EMI Error RS-485 Advance Failsafe on Open, Short or Terminated Lines 28 Pin TSSOP Packaging Flexible 4 Operation Modes Selected by 2 Configuration Pins One set of 3T5R RS-232 V.28 Drivers & Receivers One Set of RS-485 Drivers (Half Duplex Configuration) One Set of RS-485 Receivers (Half Duplex Configuration) One set of RS-422 Driver & Receiver (Full Duplex Configuration) |
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