The TRS3221CDB device consists of one line driver, one line receiver with dedicated enable pin, 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 one 3-V to 5.5-V supply. The TRS3221CDB device operates at data signaling rates up to 250 kbps 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 automatic power-down 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 on the receiver input, the driver output is disabled and the supply current is reduced to 1 μA. The INVALID output notifies the user if an RS-232 signal is present at the receiver input.
Feature
- 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 kbps
- One Driver and One Receiver
- Low Standby Current: 1-μA Typical
- External Capacitors: 4 × 0.1 μF
- Accepts 5-V Logic Input With 3.3-V Supply
- Alternative High-Speed Pin-Compatible
Device (1 Mbps)- SNx5C3221
- Automatic Power-Down Feature Automatically
Disables Drivers for Power Savings
