Overview
The SN65C3221EDBR is a single-channel RS-232 line driver/receiver produced by Texas Instruments. This device is designed to provide the electrical interface between an asynchronous communication controller and the serial-port connector. It features a dual charge-pump circuit and offers robust ESD protection, making it suitable for a wide range of applications. The SN65C3221EDBR operates with a single 3-V to 5.5-V supply and supports data signaling rates up to 1 Mbit/s, with a driver output slew rate of 24 V/µs to 150 V/µs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SSOP (DB) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage | 3 to 5.5 | V |
| Data Signaling Rate | Up to 1 Mbit/s | - |
| Standby Current | 1 µA (Typical) | - |
| External Capacitors | 4 × 0.1 µF | - |
| ESD Protection (HBM) | ±15 kV | - |
| ESD Protection (IEC 61000-4-2 Contact Discharge) | ±8 kV | - |
| ESD Protection (IEC 61000-4-2 Air Discharge) | ±15 kV | - |
Key Features
- ESD Protection for RS-232 pins: ±15-kV Human-body model (HBM), ±8-kV IEC 61000-4-2 Contact discharge, and ±15-kV IEC 61000-4-2 Air-gap discharge.
- Operates with 3-V to 5.5-V VCC supply.
- Supports data signaling rates up to 1 Mbit/s.
- Low standby current: 1 µA typical.
- Requires four small external capacitors (4 × 0.1 µF).
- Accepts 5-V logic input with 3.3-V supply.
- Auto-powerdown feature for power savings.
- INVALID output to notify if an RS-232 signal is present at the receiver input.
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 temperature range of the SN65C3221EDBR?
The operating temperature range is -40°C to 85°C.
- What is the maximum data signaling rate supported by the SN65C3221EDBR?
The device supports data signaling rates up to 1 Mbit/s.
- What type of ESD protection does the SN65C3221EDBR offer?
The device offers ±15-kV Human-body model (HBM), ±8-kV IEC 61000-4-2 Contact discharge, and ±15-kV IEC 61000-4-2 Air-gap discharge ESD protection.
- What is the typical standby current of the SN65C3221EDBR?
The typical standby current is 1 µA.
- Does the SN65C3221EDBR support 5-V logic input with a 3.3-V supply?
- What is the purpose of the INVALID output in the SN65C3221EDBR?
The INVALID output notifies the user if an RS-232 signal is present at the receiver input.
- How does the auto-powerdown feature work in the SN65C3221EDBR?
The auto-powerdown feature automatically disables the drivers for power savings when the serial port is inactive. It can be controlled using the FORCEON and FORCEOFF pins.
- What type of package is the SN65C3221EDBR available in?
The device is available in a 16-pin SSOP (DB) package.
- What are the external capacitor requirements for the SN65C3221EDBR?
The device requires four small external capacitors, each 0.1 µF.
- In which applications is the SN65C3221EDBR commonly used?
