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MAX3323E
±15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications
±15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications
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Key Features
Applications/Uses
Parametric specs for RS-232 Line Driver/Receivers
| # Rx | 1 |
| # Tx | 1 |
| VSUPPLY (V) | 3 5 |
| Data Rate (kbps) (min) | 250 |
| ICC (mA) (typ) | 1 |
| Internal Charge Pump | Yes |
| External Caps | 5 |
| Cap. Value (µF) (nom) | 0.1 |
| ESD Protect. (±kV) | 15 |
| Package/Pins | PDIP/16 TSSOP/16 |
| Budgetary Price (See Notes) | 4.72 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | ±15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications | Jan 31, 2003 | |
| App Note | FAQs about Interface, RS-232, and RS-485 Circuits |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
Parametric specs for RS-232 Line Driver/Receivers
| # Rx | 1 |
| # Tx | 1 |
| VSUPPLY (V) | 3 5 |
| Data Rate (kbps) (min) | 250 |
| ICC (mA) (typ) | 1 |
| Internal Charge Pump | Yes |
| External Caps | 5 |
| Cap. Value (µF) (nom) | 0.1 |
| ESD Protect. (±kV) | 15 |
| Package/Pins | PDIP/16 TSSOP/16 |
| Budgetary Price (See Notes) | 4.72 |
Key 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
- ±15kVHuman Body Model
- ±8kVIEC 1000-4-2 Contact Discharge
- ±15kVIEC 1000-4-2 Air-Gap Discharge
Applications/Uses
- Bar-Code Scanners
- Data Splitters
- Industrial Data Acquisition
- Video Security
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 MAX3322E 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 MAX3322E is offered in a space-saving TSSOP package. The MAX3323E is offered in 16-pin DIP and space-saving TSSOP packages.
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 MAX3322E 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 MAX3322E is offered in a space-saving TSSOP package. The MAX3323E is offered in 16-pin DIP and space-saving TSSOP packages.
Technical Docs
| Data Sheet | ±15kV ESD-Protected, RS-232 Transceivers for Multidrop Applications | Jan 31, 2003 | |
| App Note | FAQs about Interface, RS-232, and RS-485 Circuits |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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