The TRS3221E is a single driver, single receiver RS-232 solution operating from a single VCC supply. The RS-232 pins provide IEC G1000-4-2 ESD protection. 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. These devices operate 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 on the receiver input, the driver output is disabled. If FORCEOFF is set low and EN is high, both the driver and receiver 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. 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 the receiver input. The INVALID output notifies the user if an RS-232 signal is present at the receiver input. INVALID is high (valid data) if the 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 7-5 for receiver input levels.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | TRS3221E 3-V TO 5.5-V Single-Channel RS-232 Line Driver/Receiver with ±15-kV IEC ESD Protection In Small Package datasheet (Rev. B) | PDF | HTML | 16 Jul 2021 |
| Application note | RS-232 Glossary and Selection Guide | PDF | HTML | 23 May 2023 | |
| EVM User's guide | TRS3221 EVM User's Guide | 10 Nov 2020 | ||
| Application note | AN-438 Low Power RS-232C Driver and Receiver in CMOS (Rev. B) | 26 Apr 2013 | ||
| Application note | Understanding Power Requirements in RS-232 Applications (Rev. B) | 26 Apr 2013 | ||
| Application note | Removing Ground Noise in Data Transmission Systems | 05 Oct 2007 | ||
| More literature | RS-232 IEC ESD-Protected Devices From TI (Rev. A) | 27 Jul 2007 | ||
| Application note | Interface Circuits for TIA/EIA-232-F (Rev. A) | 19 Sep 2002 | ||
| Application note | Low-Voltage, Single-Supply 232-Standard Interface Solutions (Rev. A) | 19 Sep 2000 |
For additional terms or required resources, click any title below to view the detail page where available.
This evaluation module is used to evaluate the TRS3221E or TRSF3221E with RGT package. All signals are available through headers and test points. The charge pump output V+ and V- are accessible too. The board interfaces data and control CMOS logic levels on the terminal block to RS-232 levels (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SSOP (DB) | 16 | Ultra Librarian |
| TSSOP (PW) | 16 | Ultra Librarian |
| VQFN (RGT) | 16 | Ultra Librarian |
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