Overview
The TRS3221CPWR, produced by Texas Instruments, is a single-channel RS-232 line driver and receiver designed to operate within a voltage range of 3V to 5.5V. This device is part of the TRS3221 family and is specifically packaged in a 16-pin SSOP or TSSOP. It provides an electrical interface between an asynchronous communication controller and a serial-port connector, adhering to the TIA/EIA-232-F and ITU V.28 standards. The device features a charge pump that requires four small external capacitors for operation, enabling it to handle data signaling rates up to 250 kbps.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| VCC Supply Voltage | Operating voltage range | 3V to 5.5V |
| Data Signaling Rate | Maximum data rate | Up to 250 kbps |
| ESD Protection | RS-232 pin protection | ±15 kV (Human-Body Model), ±8 kV (IEC 61000-4-2, contact discharge), ±15 kV (IEC 61000-4-2, air-gap discharge) |
| Driver Output Slew Rate | Maximum slew rate | 30 V/μs |
| Standby Current | Typical standby current | 1 μA |
| External Capacitors | Required capacitors for charge pump | 4 × 0.1 μF (for 3.3V VCC), 0.047 μF and 3 × 0.33 μF (for 5V VCC) |
| Logic Input Compatibility | Acceptable logic input voltage | 5V logic input with 3.3V supply |
Key Features
- One RS-232 driver and one RS-232 receiver with dedicated enable pin
- Automatic power-down feature to disable drivers for power savings
- Charge pump circuit requiring four small external capacitors
- Meets or exceeds TIA/EIA-232-F and ITU V.28 standards
- ±15 kV ESD protection for RS-232 pins using Human-Body Model (HBM)
- Low standby current of 1 μA typical
- Accepts 5V logic input with a 3.3V supply
- Flexible control options for power management
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 TRS3221CPWR?
The TRS3221CPWR operates within a voltage range of 3V to 5.5V. - What is the maximum data signaling rate supported by the TRS3221CPWR?
The device supports data signaling rates up to 250 kbps. - What level of ESD protection does the TRS3221CPWR offer?
The device offers ±15 kV ESD protection using the Human-Body Model (HBM), ±8 kV (IEC 61000-4-2, contact discharge), and ±15 kV (IEC 61000-4-2, air-gap discharge). - How many external capacitors are required for the charge pump, and what are their values?
The charge pump requires four external capacitors: 0.1 μF each for 3.3V VCC, and 0.047 μF and 3 × 0.33 μF for 5V VCC. - What is the typical standby current of the TRS3221CPWR?
The typical standby current is 1 μA. - Can the TRS3221CPWR accept 5V logic input with a 3.3V supply?
Yes, it can accept 5V logic input with a 3.3V supply. - What is the purpose of the FORCEON and FORCEOFF inputs?
The FORCEON and FORCEOFF inputs control the automatic power-down feature, which disables the drivers for power savings when no valid RS-232 signal is detected. - How does the INVALID output function?
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. - What are some common applications of the TRS3221CPWR?
Common applications include industrial PCs, wired networking, data center and enterprise computing, battery-powered systems, PDAs, notebooks, laptops, and hand-held equipment. - Does the TRS3221CPWR meet industry standards for RS-232 interfaces?
Yes, it meets or exceeds the requirements of TIA/EIA-232-F and ITU V.28 standards.
