Overview
The TRS3221EIDBR from Texas Instruments is a single-channel RS-232 line driver and receiver integrated circuit. This device operates from a single 3V to 5.5V supply and is designed to provide the electrical interface between an asynchronous communication controller and the serial-port connector. It meets or exceeds the requirements of TIA/EIA-232-F and ITU V.28 standards, ensuring compliance with RS-232 specifications. The TRS3221EIDBR features a charge pump that requires only four small external capacitors (0.1μF each) for operation, and it supports data signaling rates up to 250kbit/s with a maximum driver output slew rate of 30V/μs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Supply Voltage | 3V to 5.5V | V |
| Data Signaling Rate | Up to 250kbit/s | kbit/s |
| Driver Output Slew Rate | 30V/μs | V/μs |
| ESD Protection (HBM) | ±15kV | V |
| ESD Protection (IEC 61000-4-2 Contact Discharge) | ±8kV | V |
| ESD Protection (IEC 61000-4-2 Air-Gap Discharge) | ±15kV | V |
| Standby Current | 1μA (Typical) | μA |
| Package Type | 16-pin VQFN (RGT), 16-pin SOT-23-THN (DYY) |
Key Features
- ESD protection for RS-232 pins: ±15kV Human-Body Model (HBM), ±8kV (IEC 61000-4-2 contact discharge), and ±15kV (IEC 61000-4-2 air-gap discharge).
- Meets or exceeds TIA/EIA-232-F and ITU V.28 standards.
- Operates with a single 3V to 5.5V VCC supply.
- Supports data rates up to 250kbit/s.
- One driver and one receiver.
- Low standby current: 1μA Typical.
- Requires four external 0.1μF capacitors.
- Accepts 5V logic input with 3.3V supply.
- Auto-powerdown feature for power savings.
Applications
- Industrial PCs.
- Wired networking.
- Data center and enterprise computing.
- Battery-powered systems.
- PDAs, notebooks, laptops, and palmtop PCs.
- Hand-held equipment.
Q & A
- What is the operating voltage range of the TRS3221EIDBR? The TRS3221EIDBR operates from a single 3V to 5.5V supply.
- What are the data signaling rates supported by the TRS3221EIDBR? The device supports data signaling rates up to 250kbit/s.
- What is the ESD protection level of the TRS3221EIDBR? The device provides ESD protection up to ±15kV using the Human-Body Model and ±8kV/±15kV for IEC 61000-4-2 contact and air-gap discharges, respectively.
- How many external capacitors are required for the TRS3221EIDBR? The device requires four external 0.1μF capacitors.
- What is the standby current of the TRS3221EIDBR? The standby current is 1μA (Typical).
- Does the TRS3221EIDBR support 5V logic input with a 3.3V supply? Yes, it accepts 5V logic input with a 3.3V supply.
- What is the auto-powerdown feature of the TRS3221EIDBR? The auto-powerdown feature automatically disables the drivers for power savings when the device does not sense a valid RS-232 signal on the receiver input.
- What are the typical applications of the TRS3221EIDBR? Typical applications include industrial PCs, wired networking, data center and enterprise computing, battery-powered systems, PDAs, notebooks, laptops, palmtop PCs, and hand-held equipment.
- What package types are available for the TRS3221EIDBR? The device is available in 16-pin VQFN (RGT) and 16-pin SOT-23-THN (DYY) packages.
- How does the INVALID output work on the TRS3221EIDBR? The INVALID output goes low when the RIN input is unpowered for more than 30 μs and goes high when the receiver has a valid input.
