Features
- Fault protected RS-485 bus pins: up to ±60V
- Extended common-mode range: ±25V more than twice the range required for RS-485
- ±16.5kV HBM ESD protection on RS-485 bus pins
- Cable invert pins corrects for reversed cable connections while maintaining Rx full fail-safe functionality
- Full fail-safe (open, short, terminated) RS-485 receivers
- 1/4 Unit Load (UL) for up to 128 devices on the bus
- High Rx IOL for opto-couplers in isolated designs
- Hot plug circuitry: Tx and Rx outputs remain three‑state during power-up/power-down
- Slew rate limited RS-485 data rate: 1Mbps
- Low quiescent supply current: 2.3mA
- Ultra low shutdown supply current: 10µA
ISL32483E_ISL32485E Functional Diagram
Description
The ISL32483E and ISL32485E (ISL3248xE) are fault protected, 5V powered differential transceivers that exceed the RS‑485 and RS‑422 standards for balanced communication. The RS‑485 transceiver pins (driver outputs and receiver inputs) are fault protected up to ±60V and are protected against ±16. 5kV ESD strikes without latch‑up. Additionally, the extended common-mode range allows these transceivers to operate in environments with common‑mode voltages up to ±25V (>2X the RS‑485 requirement), making this fault-protected RS-485 family one of the most robust on the market. The transmitters (Tx) deliver an exceptional 2. 5V (typical) differential output voltage into the RS-485 specified 54Ω load. This yields better noise immunity than standard RS-485 ICs or allows up to six 120Ω terminations in star network topologies. The receiver (Rx) inputs feature a full fail-safe design that ensures a logic high Rx output if the Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. The ISL32483E and ISL32485E include cable invert functions that reverse the polarity of the Rx and/or Tx bus pins if the cable is misconnected. Unlike competing devices, the Rx full fail-safe operation is maintained even when the Rx input polarity is switched. For fault protected RS‑485 transceivers without the cable invert function, see the ISL32470E and ISL32490E datasheets.
Parameters
| Attributes | Value |
|---|---|
| Temp. Range (°C) | -40 to +85°C |
| Devices Allowed on Bus | 128 |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| SOICN | 4.9 x 3.9 x 0.00 | 8 | 1.3 |
Applications
- Utility Meters/Automated Meter Reading Systems
- High Node Count RS-485 Systems
- PROFIBUS® and RS-485 Based Field Bus Networks, and Factory Automation
- Security Camera Networks
- Building Lighting and Environmental Control Systems
- Industrial/Process Control Networks
| Part Number | Status | Samples | Stock | RoHS | Package | Budgetary Price (USD) | Lead Count (#) | Carrier Type | Moisture Sensitivity Level (MSL) | Pb (Lead) Free | Pb Free Category | Temp. Range (°C) | Country of Assembly | Country of Wafer Fabrication |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ISL32485EIBZ | Active | Available | In Stock | RoHS:EN | SOIC | 1ku | $2 | 8# | Tube | 3 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C | MALAYSIA, TAIWAN | TAIWAN |
| ISL32485EIBZ-T | Active | N/A | In Stock | RoHS:EN | SOIC | 1ku | $2 | 8# | Reel | 3 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C | MALAYSIA, TAIWAN | TAIWAN |
| ISL32485EIBZ-T7A | Active | N/A | In Stock | RoHS:EN | SOIC | 1ku | $2.86 | 8# | Reel | 3 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C | MALAYSIA, TAIWAN | TAIWAN |
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- TrainingPDF 719 KB R15TB0008EU0100 Rev.1.00 Dec 18, 2023
- TrainingPDF 762 KB R15TB0007EU0100 Rev.1.00 Dec 04, 2023
- TrainingPDF 208 KB R15TB0004EU0100 Rev.1.00 Oct 26, 2023
- TrainingPDF 405 KB R15TB0003EU0100 Rev.1.00 Jun 26, 2023
- TrainingPDF 239 KB R15TB0002EU0100 Rev.1.00 Jun 21, 2023
- Application NotePDF 365 KB AN1978 Apr 12, 2023AI-generated Summary: The document details surge protection circuits for RS-485 transceivers, focusing on Level 4 (4kV) protection using gas discharge tubes (GDTs) for higher overvoltage and overcurrent tolerance. It compares protection schemes by component count, board area, and cost, highlighting that higher-level protection increases complexity and expense. The BOMs for Level 3 and Level 4 circuits list components such as transceivers, bidirectional TVS diodes, transient blocking units, thyristors or GDTs, and resistors. The GDT switching characteristic explains how it diverts transient currents to ground by transitioning from high impedance to a crowbar current path. Simpler protection can be achieved with overvoltage protected transceivers.
- Application NotePDF 207 KB an1985 Aug 19, 2022AI-generated Summary: Transient protection for RS-485 transceivers involves careful TVS diode design to prevent damage from high surge currents. Internal ESD structures in the ISL3152E share transient current with external TVS diodes, risking damage without current-limiting resistors. Using thick-film resistors under 200 ohms between TVS and transceiver limits surge current while minimizing bus voltage attenuation. Recommended PCB layout includes low-inductance ground and Vcc planes, 0603 resistors for wave or reflow soldering, and proper component placement to reduce inductance and enhance protection.
- Application NotePDF 474 KB AN1979 Aug 16, 2022AI-generated Summary: The document explains surge protection using Renesas’ Overvoltage Protected (OVP) transceivers with various protection schemes. It details the use of TVS diodes and thyristors to protect data lines against surge currents while maintaining low capacitance for high data rates. Different configurations address various common-mode voltage ranges and surge levels, ensuring compliance with IEC61000-4-5 standards. The paper includes calculations for peak protection voltages and discusses device characteristics and combinations for robust surge protection in industrial applications.
- Technical BriefPDF 188 KB R70TB0002EU0100 Rev.1.00 May 17, 2022
- Product Change NoticePDF 266 KB Jun 04, 2020
- Application NotePDF 178 KB r15an0002eu-rs-485-transient-protection Oct 28, 2019
- TrainingPDF 156 KB tb506 Jun 25, 2019The RS-485 standard specifies the electrical characteristics of differential drivers and receivers in multi-point networks but does not explain their functional principles. This document explains how the differential line signals are generated by the driver and processed by the receiver.
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- Application NotePDF 365 KB AN1978 Apr 12, 2023AI-generated Summary: The document details surge protection circuits for RS-485 transceivers, focusing on Level 4 (4kV) protection using gas discharge tubes (GDTs) for higher overvoltage and overcurrent tolerance. It compares protection schemes by component count, board area, and cost, highlighting that higher-level protection increases complexity and expense. The BOMs for Level 3 and Level 4 circuits list components such as transceivers, bidirectional TVS diodes, transient blocking units, thyristors or GDTs, and resistors. The GDT switching characteristic explains how it diverts transient currents to ground by transitioning from high impedance to a crowbar current path. Simpler protection can be achieved with overvoltage protected transceivers.
- Application NotePDF 207 KB an1985 Aug 19, 2022AI-generated Summary: Transient protection for RS-485 transceivers involves careful TVS diode design to prevent damage from high surge currents. Internal ESD structures in the ISL3152E share transient current with external TVS diodes, risking damage without current-limiting resistors. Using thick-film resistors under 200 ohms between TVS and transceiver limits surge current while minimizing bus voltage attenuation. Recommended PCB layout includes low-inductance ground and Vcc planes, 0603 resistors for wave or reflow soldering, and proper component placement to reduce inductance and enhance protection.
- Application NotePDF 474 KB AN1979 Aug 16, 2022AI-generated Summary: The document explains surge protection using Renesas’ Overvoltage Protected (OVP) transceivers with various protection schemes. It details the use of TVS diodes and thyristors to protect data lines against surge currents while maintaining low capacitance for high data rates. Different configurations address various common-mode voltage ranges and surge levels, ensuring compliance with IEC61000-4-5 standards. The paper includes calculations for peak protection voltages and discusses device characteristics and combinations for robust surge protection in industrial applications.
- Application NotePDF 178 KB r15an0002eu-rs-485-transient-protection Oct 28, 2019
- White PaperTIA/EIA-485 and TIA/EIA-422 standards use differential signaling to enable reliable data transmission over long distances in noisy industrial environments. This paper reviews key design considerations for selecting RS-485 transceivers, including half- and full-duplex configurations, ESD protection standards, and overvoltage protection. It also highlights high-speed transceiver features critical for minimizing data skew in advanced applications.View More (13)
Application Notes & White Papers (13)
- Product Change NoticePDF 266 KB Jun 04, 2020
- Product Change NoticePDF 570 KB PCN15027 May 13, 2015
- Product Change NoticePDF 152 KB PCN12085 Nov 07, 2012
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