3.3V, ±15kV ESD Protected, Dual Protocol (RS-232/RS-485) Transceivers
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Overview
Description
This device is a BiCMOS interface IC that is user-configured as either a single RS-422/RS-485 differential transceiver or as a dual (2 Tx, 2 Rx) RS-232 transceiver. In RS-232 mode, the on-board charge pump generates RS-232 compliant ±5V Tx output levels, from a supply as low as 3.15V. Four small 0.1µF capacitors are required for the charge pump. The transceivers are RS-232 compliant, with the Rx inputs handling up to ±25V. In RS-485 mode, the transceivers support both the RS-485 and RS-422 differential communication standards. The RS-485 receiver features full failsafe operation, so the Rx output remains in a high state if the inputs are open or shorted together. The RS-485 transmitter supports up to three data rates, two of which are slew rate limited for problem-free communications. The charge pump disables in RS-485 mode, thereby saving power, minimizing noise and eliminating the charge pump capacitors. Both RS-232/RS-485 modes feature loopback and shutdown functions. The loopback mode internally connects the Tx outputs to the corresponding Rx input, which facilitates the implementation of board-level self-test functions. The outputs remain connected to the loads during loopback, where connection problems (e.g., shorted connectors or cables) can be detected. The shutdown mode disables the Tx and Rx outputs, disables the charge pump if in RS-232 mode, and places the IC in a low current (30µA) mode. The ISL3331 is a QFN packaged device that offers additional functionality, including a lower speed and edge rate option (115kbps) for EMI sensitive designs, or to allow longer bus lengths. It also features a logic supply voltage pin (VL) that sets the VOH level of logic outputs, and the switching points of logic inputs, to be compatible with another supply voltage in mixed voltage systems. The QFN's choice of active high or low Rx enable pins increases design flexibility, allowing Tx/Rx direction control via a single signal by connecting DEN and RXEN together. For a dual-port version of these devices, see the ISL3332/ISL3333 datasheet.
Features
- User-selectable RS-232 or RS-485/RS-422 interface port (two RS-232 transceivers or one RS-485/RS-422 transceiver)
- Operates from a single 3.3V supply
- ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
- 5V tolerant logic inputs
- True flow-through pinouts simplify board layouts
- Pb-Free (RoHS compliant)
- Full failsafe (Open/Short) Rx in RS-485/RS-422 mode
- Loopback mode facilitates board self-test functions
- User-selectable RS-485 data rates 20Mbps
- Slew rate limited 460kbps
- Slew rate limited 115kbps
- Fast RS-232 data rate up to 400kbps
- Low current shutdown mode 30µA
- QFN package saves board space
- Logic supply pin (VL) eases operation in mixed supply systems
Applications
Applications
- Gaming applications (e.g., slot machines)
- Single-board computers
- Factory automation
- Security networks
- Industrial/Process control networks
- Level translators (e.g., RS-232 to RS-422)
- Point of Sale (POS) equipment
Documentation
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Datasheet
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Application Note
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Application Note
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Application Note
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Application Note
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Application Note
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Application Note
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PDF826 KB
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Application Note
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Application Note
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PDF582 KB
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Application Note
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PDF440 KB
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Application Note
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PDF338 KB
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Application Note
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PDF365 KB
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Application Note
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PDF375 KB
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Application Note
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Brochure
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PDF2.95 MB
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Brochure
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PDF156 KB
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Other
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PDF253 KB
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Other
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PDF359 KB
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Other
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PDF580 KB
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Other
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PDF326 KB
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Product Change Notice
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PDF398 KB
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Product Change Notice
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PDF222 KB
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Product Change Notice
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PDF106 KB
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Product Change Notice
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PDF173 KB
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Product Change Notice
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PDF248 KB
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Product Change Notice
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PDF438 KB
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Report
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Technical Brief
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PDF188 KB
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Technical Brief
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PDF328 KB
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Technical Brief
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White Paper
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Design & Development
Boards & Kits
Boards & Kits
3.3V, ±15kV ESD Protected, RS-232/RS-485 Transceiver Evaluation Board
The ISL3331EVAL1Z evaluation board is RoHS compliant and provides a quick and easy method for evaluating the ISL3331 BiCMOS interface IC. The board was designed to...
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Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Product Options
Processing table
| QFN | Tube | 500 | Get Samples, | |
| QFN | Reel | 4000 |
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