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

  • 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

descriptionDocumentation

Title language Type Format File Size Date
Datasheets & Errata
star ISL81334, ISL41334 Datasheet Datasheet PDF 1.57 MB
Application Notes & White Papers
R15AN0002: RS-485 Transient Protection in Industrial DC-Supply Buses Rev.1.00 Application Note PDF 178 KB
How to Simplify Industrial PC Interfaces 简体中文 White Paper PDF 920 KB
AN1991: Isolating RS-485 Interfaces with High-Speed Digital Optocouplers Application Note PDF 513 KB
AN1990: RS-485 Transceivers in J1708 Physical Layer Applications of Heavy Duty Vehicles Application Note PDF 826 KB
AN1987: RS-485 External Fail-Safe Biasing for Isolated Long Haul Buses Application Note PDF 443 KB
AN1986: External Fail-Safe Biasing of RS-485 Networks Application Note PDF 582 KB
AN1985: Transient Protection for the Standard RS-485 Transceiver: ISL3152E Application Note PDF 335 KB
AN1989: RS-422 vs RS-485: Similarities and Key Differences Application Note PDF 440 KB
AN1976: Important Transient Immunity Tests for RS-485 Networks Application Note PDF 338 KB
AN1977: Transient Voltage Suppressors: Operation and Features Application Note PDF 365 KB
AN1978: Surge Protection for Intersil's Standard RS-485 Transceivers Application Note PDF 369 KB
AN1979: Surge Protection simplified with Intersil's Overvoltage Protected (OVP) Transceivers Application Note PDF 500 KB
AN1980: Ground Potential Differences: Origin and Remedies Application Note PDF 375 KB
PCNs & PDNs
PCN20029A - Alternate bond wire material and assembly facility of the listed Renesas QFN packaged products Product Change Notice PDF 327 KB
PCN15046 - Wafer Fabrication Site Change for Listed Intersil Products - Global Foundry P6 Process transfer to Palm Bay - Phase II Product Change Notice PDF 398 KB
PCN13064 - Alternate Bond Wire Material and Manufacturing Facilities for Assembly of the Listed Intersil DFN/QFN Packaged Products - Carsem (CAS) Ipoh, Malaysia Product Change Notice PDF 151 KB
PCN13060 - Test Site Change for the Listed Intersil Products Product Change Notice PDF 223 KB
PCN13025B - Alternate Bond Wire Material and Manufacturing Facilities for Assembly of the Listed Intersil DFN/QFN Packaged Products Product Change Notice PDF 222 KB
PCN13025 - Alternate Bond Wire Material and Manufacturing Facilities for Assembly of the Listed Intersil DFN/QFN Packaged Products - Advanced Semiconductor Engineering (ASECL) - Chung-Li , Taiwan and STATS ChipPAC (SCM) - Kuala Lumpur, Mal Product Change Notice PDF 106 KB
PCN13009 - Alternate Bond Wire Material and Manufacturing Facilities for Assembly of the Listed Intersil DFN/QFN Packaged Products - Advanced Semiconductor Engineering (ASECL) - Chung-Li (ASECL), Taiwan and STATS ChipPAC (SCM) - Kuala Lump Product Change Notice PDF 173 KB
PCN10055 - Alternate Bond Wire Material for Assembly of the Listed Intersil DFN/QFN Packaged Products - STATS ChipPAC Malaysia Product Change Notice PDF 248 KB
Other
Analog ICs Brochure 日本語 Brochure PDF 4.20 MB
PIN19028 - Q3 Cy 19 Price Increase Notice Price Increase Notice PDF 208 KB
TB506: Functional Principles of RS-485 Drivers and Receivers Other PDF 156 KB
TB509: Detecting Bus Signals Correctly with Failsafe Biased RS-485 Receivers Technical Brief PDF 300 KB
TB513: Designing a 3-Wire, Half-Duplex, Dual Protocol Interface Using the ISL3330 and ISL3331 Technical Brief PDF 328 KB
TB511: The Unit Load Concept Other PDF 253 KB
TB508: Dual Protocol Applications: Programmable vs Standard Transceivers Other PDF 359 KB
TB507: Dual Protocol Transceivers Simplify Interface Design Other PDF 580 KB

memoryBoards & Kits

Part Number Title Type Company
ISL41334EVAL1Z ±15kV ESD Protected, 5V, 2-Port, Dual Protocol (RS-232/RS-485) Transceiver Evaluation Board Evaluation Renesas
ISL41387EVAL1Z ±15kV ESD Protected, 5V, Dual Protocol (RS-232/RS-485) Transceiver Evaluation Board Evaluation Renesas