Overview
The SN65C3221E, specifically the SN65C3221PWRE4, is a single-channel RS-232 compatible line driver and 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 operates with a single 3-V to 5.5-V supply and supports data signaling rates up to 1 Mbit/s. The SN65C3221E features a dual charge-pump circuit and includes ±15-kV ESD protection for RS-232 pins, ensuring robust performance in various environments.
Key Specifications
| Parameter | Description |
|---|---|
| Package | TSSOP (PW) with 16 pins |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage (VCC) | 3-V to 5.5-V |
| Data Signaling Rate | Up to 1 Mbit/s |
| Driver Output Slew Rate | 24 V/μs to 150 V/μs |
| Standby Current | 1 μA typical |
| External Capacitors | 4 × 0.1 μF |
| ESD Protection | ±15-kV Human-body model (HBM), ±8-kV IEC 61000-4-2 Contact discharge, ±15-kV IEC 61000-4-2 Air-gap discharge |
Key Features
- 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
- External capacitors: 4 × 0.1 μF
- Accepts 5-V logic input with 3.3-V supply
- RS-232 bus-pin ESD protection exceeds ±15 kV using human-body model (HBM)
- Auto-powerdown feature automatically disables drivers for power savings
- INVALID output notifies the user 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 and laptops
- Palmtop PCs
- Hand-held equipment
Q & A
- What is the operating voltage range of the SN65C3221E? The SN65C3221E operates with a supply voltage (VCC) ranging from 3-V to 5.5-V.
- What is the maximum data signaling rate supported by the SN65C3221E? The device supports data signaling rates up to 1 Mbit/s.
- What type of ESD protection does the SN65C3221E offer? The SN65C3221E 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 does the auto-powerdown feature work in the SN65C3221E? The auto-powerdown feature disables the drivers when no valid RS-232 signal is detected on the receiver input, reducing the supply current to 1 μA.
- What is the typical standby current of the SN65C3221E? The typical standby current is 1 μA.
- What external components are required for the SN65C3221E to operate? The device requires four external capacitors, each 0.1 μF.
- Can the SN65C3221E accept 5-V logic input with a 3.3-V supply? Yes, the device can accept 5-V logic input with a 3.3-V supply.
- How does the INVALID output function in the SN65C3221E? The INVALID output notifies the user if an RS-232 signal is present at the receiver input, indicating valid or invalid data based on the receiver input voltage levels.
- What are some common applications of the SN65C3221E? Common applications include industrial PCs, wired networking, data center and enterprise computing, battery-powered systems, and hand-held equipment.
- What is the operating temperature range of the SN65C3221E? The operating temperature range is -40°C to 85°C.
