TRS3223

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltages are with respect to network GND.
(3) Maximum power dissipation is a function of TJ(max), JA, and T_A. The maximum allowable power dissipation at any  llowable ambient temperature is P_D = (T_J(max) T_A)/_JA. Operating at the absolute maximum T_J of 150 can affect reliability.
(4) The package thermal impedance is calculated in accordance with JESD 51-7.

The TRS3223 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 TRS3223 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 TRS3223 operates at data signaling rates up to 250 kbit/s and a maximum of 30-V/s 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 of TRS3223 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 A. Disconnecting the serial port or turning off the peripheral drivers of TRS3223 causes auto-powerdown to occur.

Auto-powerdown of TRS3223 can be disabled whenFORCEON 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 s. INVALID of TRS3223 is low (invalid data) if the receiver input voltage of TRS3223 is between 0.3 V and 0.3 V for more than 30 s. Refer to Figure 4 for receiver input levels.