Features
- Fault protected RS-485 bus pins: up to ±60V
- Extended CMR: ±25V (more than twice the range required for RS-485)
- ±16.5kV HBM ESD protection on RS-485 bus pins
- 1/4 unit load for up to 128 devices on the bus
- High transient overvoltage tolerance: ±80V
- Full fail-safe (open, short, terminated) RS-485 receivers
- High Rx IOL for opto-couplers in isolated designs
- Hot plug circuitry; Tx and Rx outputs remain three-state during power-up/power-down
- Choice of RS-485 data rates: 250kbps to 15Mbps
- Low quiescent supply current: 2.3mA
- Ultra low shutdown supply current: 10μA
ISL3249xE Functional Diagram
Description
The ISL32490E, ISL32492E, ISL32493E, ISL32495E, ISL32496E, and ISL32498E 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 (CMR) 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 Rx outputs have high drive levels; typically, 15mA at VOL = 1V (for opto-coupled, isolated applications). Half duplex (Rx inputs and Tx outputs multiplexed together) and full duplex pinouts are available. See Table 1 on page 3 for key features and configurations by device number. For fault protected or wide common-mode range RS-485 transceivers with cable invert (polarity reversal) pins, see the ISL32483E datasheet.
Parameters
| Attributes | Value |
|---|---|
| Temp. Range (°C) | -40 to +85°C |
| Devices Allowed on Bus | 128 |
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) | Pitch (mm) | Pkg. Dimensions (mm) | Pb (Lead) Free | Pb Free Category | Temp. Range (°C) | Country of Assembly | Country of Wafer Fabrication |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ISL32495EIBZ | Active | Available | In Stock | RoHS:EN | SOIC | 1ku | $1.41 | 8# | Tube | 3 | 1.3mm | 4.9 x 3.9 x 0.00 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C | MALAYSIA, TAIWAN | TAIWAN |
| ISL32495EIBZ-T | Active | N/A | Out of Stock | RoHS:EN | SOIC | 1ku | $1.41 | 8# | Reel | 3 | 1.3mm | 4.9 x 3.9 x 0.00 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C | MALAYSIA, TAIWAN | TAIWAN |
| ISL32495EIBZ-T7A | Active | N/A | In Stock | RoHS:EN | SOIC | 1ku | $2.7 | 8# | Reel | 3 | 1.3mm | 4.9 x 3.9 x 0.00 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C | MALAYSIA, TAIWAN | TAIWAN |
| ISL32495EIUZ | Active | Available | In Stock | RoHS:EN | MSOP | 1ku | $1.41 | 8# | Tube | 1 | 0.7mm | 3.0 x 3.0 x 0.00 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C | MALAYSIA | TAIWAN |
| ISL32495EIUZ-T | Active | N/A | In Stock | RoHS:EN | MSOP | 1ku | $1.41 | 8# | Reel | 1 | 0.7mm | 3.0 x 3.0 x 0.00 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C | MALAYSIA | TAIWAN |
| ISL32495EIUZ-T7A | Obsolete | N/A | Out of Stock | RoHS:EN | MSOP | 8# | Reel | 1 | 0.7mm | 3.0 x 3.0 x 0.00 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C |
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- TrainingPDF 719 KB R15TB0008EU0100 Rev.1.00 Dec 18, 2023
- TrainingPDF 762 KB R15TB0007EU0100 Rev.1.00 Dec 04, 2023
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- 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
- DatasheetPDF 1.42 MB isl32490e-92e-93e-95e-96e-98e May 25, 2017
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- DatasheetPDF 1.42 MB isl32490e-92e-93e-95e-96e-98e May 25, 2017
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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 (14)
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- Product Change NoticePDF 266 KB Jun 04, 2020
- Product Change NoticePDF 545 KB PCN15018 Apr 21, 2015
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- Product Change NoticePDF 117 KB PCN11059 Jun 17, 2011
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