| Drivers per package | 2 |
| Receivers per package | 2 |
| Logic voltage (Min) (V) | 3.3 |
| Data rate (Max) (kbps) | 250 |
| Main supply voltage (Nom) (V) | 3.3, 5 |
| Features | Auto-Powerdown |
| ESD HBM (kV) | 15 |
| Rating | Automotive |
| Operating temperature range (C) | -40 to 125 |
| Vout (Typ) (V) | 5.4 |
- Qualified for Automotive Applications
- RS-232 Bus-Pin ESD Protection Exceeds
±15 kV Using Human-Body Model (HBM) - 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 250 kbit/s
- Two Drivers and Two Receivers
- Low Standby Current . . . 1 μA Typical
- External Capacitors . . . 4 × 0.1 μF
- Accepts 5-V Logic Input With 3.3-V Supply
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 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 data signaling rates up to 250 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 μA. 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. See Figure 4 for receiver input levels.
