SN75C23243

具有 +/-15kV ESD 保护的 3V 至 5.5V 多通道 250kbps RS-232 线路驱动器/接收器; • Single-Chip and Single-Supply Interface for Two IBM™ PC/AT Serial Port\n• Meet or Exceed the Requirements of TIA/EIA-232-F and ITU v.28 Standards\n• Operate With 3-V to 5.5-V VCC Supply\n• Always-Active Noninverting Receiver Output (ROUT2\\) Per Port\n• Operate up to 250 kbit/s\n• Low Standby Current ...1 µA Typical\n• External Capacitors ...4 × 0.22 µF\n• Accept 5-V Logic Input With 3.3-V Supply\n• Allow for Flexible Power Down of Either Serial Port\n• Serial-Mouse Driveability\n• RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)\n• Applications \n• Battery-Powered Systems, Notebooks, Laptops, Palmtop PCs, and Hand-Held Equipment\n \n IBM is a trademark of International Business Machines Corporation.;

The SN65C23243 and SN75C23243 consist of two ports, each containing three line drivers and five line receivers, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). These devices meet the requirements of TIA/EIA-232-F and provide the electrical interface between an asynchronous communication controller and the serial-port connector. This combination of drivers and receivers matches that needed for two typical serial ports 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, these devices include an always-active noninverting output (ROUT2\\) per port, which allows applications using the ring indicator to transmit data while the devices are powered down. The devices operate at data signaling rates up to 250 kbit/s, and a maximum of 30-V/µs driver output slew-rate.\n\n Flexible control options for power management are available when either or both serial ports are 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 of its respective port are disabled. If FORCEOFF\\ is set low, both drivers and receivers (except ROUT2\\) 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.\n\n 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 RS-232 port is activated automatically when a valid signal is applied to any respective receiver input. The INV\\ output is used to notify the user if an RS-232 signal is present at any receiver input. INV\\ 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. INV\\ 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.

SN75C23243

3-V TO 5.5-V DUAL RS-232 PORT

SN75C23243

3-V TO 5.5-V DUAL RS-232 PORT

SN75C23243

3-V TO 5.5-V DUAL RS-232 PORT

SN75C23243CDGGR

3-V TO 5.5-V DUAL RS-232 PORT

SN75C23243CDLR

3-V TO 5.5-V DUAL RS-232 PORT

SN75C23243DGGR

3-V TO 5.5-V DUAL RS-232 PORT

SN75C23243DGGR

3-V TO 5.5-V DUAL RS-232 PORT

SN75C23243DGGR

3-V TO 5.5-V DUAL RS-232 PORT

SN75C23243DGGRE4

3-V TO 5.5-V DUAL RS-232 PORT