Overview
The ST3222ECTR, produced by STMicroelectronics, is a 3 V powered EIA/TIA-232 and V.28/V.24 communications interface. This device is designed to meet low power requirements while offering high data-rate capabilities and enhanced electrostatic discharge (ESD) protection. The ST3222ECTR features a proprietary low dropout transmitter output stage, ensuring true RS-232 performance from 3 to 5 V supplies using a dual charge pump. This device is particularly suited for applications in portable systems due to its low power consumption and shutdown mode, which extends battery life.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | -0.3 to 6 | V |
| ESD Protection | ± 15 kV (Human Body Model), ± 8 kV (IEC 1000-4-2 Contact Discharge) | kV |
| Supply Current (ISUPPLY) | 0.3 to 1 | mA |
| Shutdown Supply Current (ISHDN) | 1 to 10 | µA |
| Data Rate | Up to 250 Kbps | Kbps |
| Slew Rate | 6 V/µs (minimum guarantee) | V/µs |
| Temperature Range | -40 to 85 °C | °C |
| Package | TSSOP20 |
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 guarantee slew rate of 6 V/µs
- Meets EIA/TIA-232 specification down to 3 V
- Available in SSOP20 and TSSOP20 packages
- 1 mA shutdown mode to reduce power consumption and extend battery life in portable systems
- Receivers can remain active in shutdown mode, allowing external devices to be monitored
Applications
The ST3222ECTR is typically used in various applications including:
- 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 ST3222ECTR?
The ST3222ECTR operates from a supply voltage range of 3 to 5.5 V.
- What is the maximum data rate supported by the ST3222ECTR?
The device is guaranteed to run at data rates of up to 250 Kbps.
- What kind of ESD protection does the ST3222ECTR offer?
The ST3222ECTR offers ESD protection up to ± 15 kV (Human Body Model) and ± 8 kV (IEC 1000-4-2 Contact Discharge).
- What is the typical supply current of the ST3222ECTR?
The typical supply current is 300 µA.
- What is the shutdown supply current of the ST3222ECTR?
The shutdown supply current is 1 mA.
- Can the receivers remain active in shutdown mode?
- What packages are available for the ST3222ECTR?
The device is available in SSOP20 and TSSOP20 packages.
- What is the temperature range of the ST3222ECTR?
The temperature range is -40 to 85 °C.
- What are some typical applications of the ST3222ECTR?
Typical applications include Notebook, Sub-notebook, and Palmtop Computers, Battery Powered Equipment, Hand-Held Equipment, Peripherals, and Printers.
- How many external capacitors are required for the charge pump operation?
The charge pump requires only four small 0.1 µF external capacitors for operation from a 3 V supply.
