Overview
The ST3222EBTR, produced by STMicroelectronics, is a 3 V powered EIA/TIA-232 and V.28/V.24 communications interface. This device is designed for low power requirements and high data-rate capabilities, making it suitable for a variety of applications. It features enhanced electrostatic discharge (ESD) protection and a proprietary low dropout transmitter output stage, ensuring true RS-232 performance from 3 to 5 V supplies. The device includes a dual charge pump that requires only four small 0.1 µF external capacitors for operation from a 3 V supply.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | -0.3 to 6 | V |
| Supply Current (ISUPPLY) | 0.3 to 1 | mA |
| Shutdown Supply Current (ISHDN) | 1 to 10 | µA |
| Data Rate | Up to 250 Kbps | |
| Slew Rate | 6 V/µs (minimum) | |
| ESD Protection | ± 15 kV (Human Body Model), ± 8 kV (IEC 1000-4-2 Contact Discharge) | |
| Package | TSSOP20 | |
| Temperature Range | -40 to 85 °C |
Key Features
- ESD protection for RS-232 I/O pins up to ± 15 kV (Human Body Model) and ± 8 kV (IEC 1000-4-2 Contact Discharge)
- Low power consumption with a supply current of 300 µA
- Guaranteed data rate of up to 250 Kbps
- Minimum slew rate of 6 V/µs
- Meets EIA/TIA-232 specification down to 3 V
- Available in SSOP20 and TSSOP20 packages
- Proprietary low dropout transmitter output stage for true RS-232 performance
- Dual charge pump requiring only four small 0.1 µF external capacitors
- 1 mA shutdown mode to reduce power consumption and extend battery life
- Receivers can remain active in shutdown mode for monitoring external devices
Applications
- Notebook, Sub-notebook, and Palmtop Computers
- Battery Powered Equipment
- Hand-Held Equipment
- Peripherals and Printers
Q & A
- What is the operating voltage range of the ST3222EBTR? The operating voltage range is from 3 V to 5.5 V.
- What is the maximum data rate supported by the ST3222EBTR? The device supports up to 250 Kbps.
- What type of ESD protection does the ST3222EBTR offer? It offers ± 15 kV ESD protection using the Human Body Model and ± 8 kV using IEC 1000-4-2 Contact Discharge.
- What is the typical supply current of the ST3222EBTR? The typical supply current is 300 µA.
- What is the shutdown supply current of the ST3222EBTR? The shutdown supply current is 1 mA.
- Can the receivers remain active in shutdown mode? Yes, the receivers can remain active in shutdown mode to monitor external devices.
- What packages are available for the ST3222EBTR? The device is available in SSOP20 and TSSOP20 packages.
- What is the temperature range for the ST3222EBTR? The temperature range is from -40 to 85 °C.
- How many external capacitors are required for the charge pump? Four small 0.1 µF external capacitors are required.
- Does the ST3222EBTR meet EIA/TIA-232 specifications? Yes, it meets EIA/TIA-232 specifications down to 3 V.
