Overview
The ST3222CTR, 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 various portable and battery-powered applications. It features a proprietary low dropout transmitter output stage that ensures true RS-232 performance from 3 to 3.6 V power supplies. The ST3222CTR is particularly useful in notebooks, sub-notebooks, palmtop computers, hand-held equipment, peripherals, and printers.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | -0.3 | 6 | V | |
| Supply Current (ISUPPLY) | 0.3 | 1 | mA | |
| Shutdown Supply Current (ISHDN) | 1 | 10 | µA | |
| Data Transfer Rate (DR) | 240 | 400 | Kbps | |
| Transmitter Output Voltage Swing (VTOUT) | ±5 | ±5.4 | V | |
| Receiver Input Voltage Range (VRIN) | -25 | 25 | V | |
| Temperature Range | 0 | 70 | °C | |
| Package Type | TSSOP20 (tape and reel) |
Key Features
- Low power consumption: 300 µA supply current and 1 mA shutdown mode to extend battery life in portable systems.
- High data-rate capabilities: Guaranteed to run at data rates of 250 Kbps while maintaining RS-232 output levels.
- Proprietary low dropout transmitter output stage: Ensures true RS-232 performance from 3 to 3.6 V power supplies.
- Minimal external components: Requires only four small 0.1 µF standard external capacitors for operation.
- Active receivers in shutdown mode: Allows monitoring of external devices like modems using only 1 mA supply current.
- High slew rate: Minimum guarantee of 6 V/µs slew rate.
Applications
The ST3222CTR is suitable for a variety of applications, including:
- Notebooks and sub-notebooks.
- Palmtop computers.
- Battery-powered equipment.
- Hand-held equipment.
- Peripherals and printers.
Q & A
- What is the operating voltage range of the ST3222CTR?
The ST3222CTR operates from 3 to 3.6 V.
- What is the maximum data transfer rate of the ST3222CTR?
The device is guaranteed to run at data rates of up to 400 Kbps.
- How much power does the ST3222CTR consume in normal operation?
The supply current is typically 1 mA.
- What is the shutdown supply current of the ST3222CTR?
The shutdown supply current is typically 1 µA.
- What type of package is the ST3222CTR available in?
The device is available in a TSSOP20 package (tape and reel).
- What is the temperature range for the ST3222CTR?
The temperature range is from 0 to 70 °C.
- How many external capacitors are required for the ST3222CTR to operate?
The device requires four small 0.1 µF standard external capacitors.
- Can the receivers of the ST3222CTR remain active in shutdown mode?
- What is the slew rate of the ST3222CTR?
The minimum guarantee slew rate is 6 V/µs.
- What are some typical applications of the ST3222CTR?
Typical applications include notebooks, sub-notebooks, palmtop computers, battery-powered equipment, hand-held equipment, peripherals, and printers.
