±15kV ESD Protected, 5V, Two Port, Dual Protocol (RS-232/RS-485) Transceivers
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Overview
Description
The ISL81334 and ISL41334 are two-port interface ICs in which each port can be independently configured as a single RS-485, RS-422 transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver. With both ports set to the same mode, two RS-485, RS-422 transceivers, or four RS-232 transceivers are available. If either port is in RS-232 mode, the onboard charge pump generates RS-232 compliant ±5V Tx output levels from a single VCC supply as low as 4.5V. 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, and the Tx outputs handling ±12V. In RS-485 mode, the transceivers support both the RS-485 and RS-422 differential communication standards. The receivers feature “full fail-safe” operation, so the Rx outputs remain in a high state if the inputs are open or shorted together. The transmitters support up to three data rates, two of which are slew rate limited for problem-free communications. The charge pump disables when both ports are in RS-485 mode, thereby saving power, minimizing noise, and eliminating the charge pump capacitors. Both RS-232 and RS-485 modes feature loopback and shutdown functions. Loopback internally connects the Tx outputs to the corresponding Rx input, to facilitate board level self-test implementation. The outputs remain connected to the loads during loopback, so connection problems (such as shorted connectors or cables) can be detected. Shutdown mode disables the Tx and Rx outputs, disables the charge pumps, and places the IC in a low current (µA) mode. The ISL41334 is a QFN packaged device that includes two additional user-selectable, lower speed and edge rate options for EMI-sensitive designs, or to allow longer bus lengths. It also features a logic supply 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 also adds active low Rx enable pins to increase design flexibility, allowing Tx/Rx direction control, through a single signal per port, by connecting the corresponding DE and RXEN pins together. For a single port version of these devices, please see the ISL81387, ISL41387 datasheet.
Features
- ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
- Two independent ports, each user selectable for RS-232 (2 transceivers) or RS-485, RS-422 (1 transceiver)
- Single 5V (10% tolerance) supply
- Flow-through pinouts simplify board layouts
- Pb-Free (RoHS compliant)
- Large (2.7V) differential VOUT for improved noise immunity in RS-485, RS-422 networks
- Full fail-safe (open/short) Rx in RS-485, RS-422 mode
- Loopback mode facilitates board self-test functions
- User-selectable RS-485 data rates (ISL41334 only); Fast speed 20Mbps, Slew rate limited 460kbps, Slew rate limited 115kbps
- Fast RS-232 data rate up to 650kbps
- Low current Shutdown mode 42µA
- QFN package saves board space (ISL41334 only)
- Logic supply pin (VL) eases operation in mixed supply systems (ISL41334 only)
Applications
Applications
- Gaming applications (such as slot machines)
- Single board computers
- Factory automation
- Security networks
- Industrial/Process control networks
- Level translators
- Such as RS-232 to RS-422
- Point of sale (POS) equipment
- Dual channel RS-485 interfaces
Documentation
| Document title | Document type
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Date Date | |
|---|---|---|---|
| PDF 1.57 MB | Datasheet | ||
| PDF 365 KB | Application Note | ||
| PDF 207 KB | Application Note | ||
| PDF 474 KB | Application Note | ||
| PDF 366 KB | Application Note | ||
| PDF 178 KB | Application Note | ||
| PDF 513 KB | Application Note | ||
| PDF 826 KB | Application Note | ||
| PDF 443 KB | Application Note | ||
| PDF 582 KB | Application Note | ||
| PDF 440 KB | Application Note | ||
| PDF 338 KB | Application Note | ||
| PDF 365 KB | Application Note | ||
| PDF 375 KB | Application Note | ||
| PDF 4.91 MB 日本語 | Brochure | ||
| PDF 2.95 MB | Brochure | ||
| PDF 156 KB | Other | ||
| PDF 253 KB | Other | ||
| PDF 359 KB | Other | ||
| PDF 580 KB | Other | ||
| PDF 208 KB | Price Increase Notice | ||
| PDF 326 KB | Product Change Notice | ||
| PDF 398 KB | Product Change Notice | ||
| PDF 151 KB | Product Change Notice | ||
| PDF 223 KB | Product Change Notice | ||
| PDF 222 KB | Product Change Notice | ||
| PDF 106 KB | Product Change Notice | ||
| PDF 173 KB | Product Change Notice | ||
| PDF 248 KB | Product Change Notice | ||
| PDF 438 KB | Report | ||
| PDF 266 KB 简体中文 | Technical Brief | ||
| PDF 188 KB | Technical Brief | ||
| PDF 328 KB | Technical Brief | ||
| PDF 405 KB | Training | ||
| PDF 239 KB | Training | ||
| PDF 920 KB 简体中文 | White Paper | ||
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Design & Development
Boards & Kits
Boards & Kits
±15kV ESD Protected, 5V, 2-Port, Dual Protocol (RS-232/RS-485) Transceiver Evaluation Board
The RoHS compliant ISL41334EVAL1Z evaluation board provides a quick and easy method for evaluating the ISL41334 two-port, dual-protocol, interface IC. The board also...
Featured Documents:
±15kV ESD Protected, 5V, Dual Protocol (RS-232/RS-485) Transceiver Evaluation Board
The RoHS compliant ISL41387EVAL1Z evaluation board provides a quick and easy method for evaluating the ISL41387 dual protocol, BiCMOS, interface IC. The board also...
Featured Documents:
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 | ||
| QFN | Reel | 250 |
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