General Description
The MAX3322E/MAX3323E 3.0V to 5.5V powered EIA/TIA-232 and V.28/V.24 communications interfaces are designed for multidrop applications with low power requirements, high data-rate capabilities, and enhanced electrostatic discharge (ESD) protection. All RS-232 inputs and outputs are protected to ±15kV using the IEC 1000-4-2 Air-Gap Discharge method, ±8kV using the IEC 1000-4-2 Contact Discharge method, and ±15kV using the Human Body Model.
The MAX3322E/MAX3323E have pin-selectable 5kΩ/high-impedance RS-232 receivers. These devices are capable of receiving data in high-impedance mode. In multidrop applications, one receiver has a 5kΩ input resistance, while the other receivers are high impedance to ensure the RS-232 standard is observed. Logic control permits selection of the functional mode: high impedance or RS-232 standard load. The transmitters are enabled by logic control to allow the multiplexing of the inputs to a single UART.
A proprietary low-dropout transmitter output stage enables true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The charge pump requires only four small 0.1µF capacitors for operation from a 3.3V supply. The MAX3322E/MAX3323E are capable of running at data rates up to 250kbps while maintaining RS-232-compliant output levels. The MAX3322E/MAX3323E have a unique VL pin that allows operation in mixed-logic voltage systems. Both input and output logic levels are pin programmable through the VL pin.
The MAX3322EEUP is a 2Tx/2Rx device for hardware handshaking in standard RS-232 mode, and the MAX3323E is a 1Tx/1Rx, required in most multidrop applications. The MAX3322EEUP is offered in a space-saving TSSOP package. The MAX3323E is offered in 16-pin DIP and space-saving TSSOP packages.
Features
♦ Pin-Selectable 5kΩ/High-Impedance Receivers
♦ Transmitter Outputs Three-Stated by Logic Control
♦ VL Pin for Compatibility with Mixed Voltage Systems
♦ 1Tx/1Rx (MAX3323E) or 2Tx/2Rx (MAX3322E) Versions
♦ 250kbps Data Rate
♦ 1µA Low-Power Shutdown
♦ High ESD Protection for RS-232 I/O Pins
±15kV—Human Body Model
±8kV—IEC 1000-4-2 Contact Discharge
±15kV—IEC 1000-4-2 Air-Gap Discharge
Feature
- Pin-Selectable 5kΩ/High-Impedance Receivers
- Transmitter Outputs Three-Stated by Logic Control
- VL Pin for Compatibility with Mixed Voltage Systems
- 1Tx/1Rx (MAX3323E) or 2Tx/2Rx (MAX3322E) Versions
- 250kbps Data Rate
- 1μA Low-Power Shutdown
- High ESD Protection for RS-232 I/O Pins
- ±15kV—Human Body Model
- ±8kV—IEC 1000-4-2 Contact Discharge
- ±15kV—IEC 1000-4-2 Air-Gap Discharge
Applications
- Bar-Code Scanners
- Data Splitters
- Industrial Data Acquisition
- Video Security
(Picture: Pinout)
