描述 Description

The TRS3223E consists of two line drivers, two line receivers, and a dual charge-pump circuit with ±15-kV ESD 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. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. The device operates at typical data signaling rates up to 500 kbit/s and a maximum of 30-V/μs driver output slew rate. 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 and EN is high, both drivers and receivers are shut off, and the supply current is reduced to 1 mA. Disconnecting the serial port or turning off the peripheral drivers causes auto-powerdown to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high. 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 the receiver input voltage is between -0.3 V and 0.3 V for more than 30 μs. Refer to Figure 4 for receiver input levels.

特性 Features

? ESD Protection for RS-232 Bus Pins
? ±15-kV Human-Body Model (HBM)
? ±8-kV IEC61000-4-2, Contact Discharge
? ±15-kV IEC61000-4-2, Air-Gap Discharge

? Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU v.28 Standards
? Operates With 3-V to 5.5-V VCC Supply
? Operates up to 500 kbit/s
? Two Drivers and Two Receivers
? Low Standby Current . . . 1 μA Typ
? External Capacitors . . . 4 × 0.1 μF
? Accepts 5-V Logic Input With 3.3-V Supply
? Alternative High-Speed Pin-Compatible Device (1 Mbit/s) for TRSF3223E
? APPLICATIONS
? Battery-Powered Systems
? PDAs
? Notebooks
? Laptops
? Palmtop PCs
? Hand-Held Equipment