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TRS3243IDWG4 Datasheet(PDF) 1 Page - Texas Instruments |
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TRS3243IDWG4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 19 page www.ti.com FEATURES APPLICATIONS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 C2+ C2− V− RIN1 RIN2 RIN3 RIN4 RIN5 DOUT1 DOUT2 DOUT3 DIN3 DIN2 DIN1 C1+ V+ VCC GND C1− FORCEON FORCEOFF INVALID ROUT2B ROUT1 ROUT2 ROUT3 ROUT4 ROUT5 DB, DW, OR PW PACKAGE (TOP VIEW) DESCRIPTION/ORDERING INFORMATION TRS3243 3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER WITH ±15-kV ESD (HBM) PROTECTION SLLS806 – JUNE 2007 • Battery-Powered • Single-Chip and Single-Supply Interface for IBM™ PC/AT™ Serial Port • Systems • PDAs • RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM) • Notebooks • Laptops • Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU v.28 Standards • Palmtop • Operates With 3-V to 5.5-V V CC Supply • PCs • Hand-Held Equipment • Three Drivers and Five Receivers • Low Standby Current . . . 1 mA Typical • External Capacitors . . . 4 × 0.1 mF • Accepts 5-V Logic Input With 3.3-V Supply • Always-Active Noninverting Receiver Output (ROUT2B) • Operating Speed – TRS3243C, TRS3243I . . . 250 Kbit/s – TRS3243FC, TRS3243FI . . . 1000 Kbit/s • Operating Temperature – TRS3243C, TRS3243FC . . . 0 °C to 70°C – TRS3243I, TRS3243FI . . . –40 °C to 85°C • Serial-Mouse Driveability • Auto-Powerdown Feature to Disable Driver Outputs When No Valid RS-232 Signal Is Sensed The TRS3243 consists of three line drivers, five line receivers, and a dual charge-pump circuit with ±15-kV ESD (HBM) protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. This combination of drivers and receivers matches that needed for the typical serial port used in an IBM PC/AT or compatible. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In addition, the device includes an always-active noninverting output (ROUT2B), which allows applications using the ring indicator to transmit data while the device is powered down. Flexible control options for power management are available when the serial port is inactive. The auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is set low, both drivers and receivers (except ROUT2B) are shut off, and the supply current is reduced to 1 μA. Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high and should be done when driving a serial mouse. With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to any receiver input. The INVALID output is used to notify the user if an RS-232 signal is present at any receiver input. INVALID is high (valid data) if any receiver input voltage is greater than 2.7 V or less than –2.7 V or has been between –0.3 V and 0.3 V for less than 30 μs. INVALID is low (invalid data) if all receiver input voltages are between –0.3 V and 0.3 V for more than 30 μs. Refer to Figure 5 for receiver input levels. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. IBM, PC/AT are trademarks of IBM. PRODUCTION DATA information is current as of publication date. Copyright © 2007, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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