Features
- High Data Rate up to 30Mbps
- Operates from a Single +3.3V Supply (10% Tolerance)
- Interoperable with 5V Logic
- Single Unit Load Allows up to 32 Devices on the Bus
- Low Current Shutdown Mode 15nA
- -7V to +12V Common Mode Input Voltage Range
- Three State Rx and Tx Outputs
- 10ns Propagation Delay, 1ns Skew
- Half Duplex Pinout
- Current Limiting and Thermal Shutdown for driver Overload Protection
- Pb-Free Available (RoHS Compliant)
ISL43485 Functional Diagram
Description
The Intersil ISL43485 is a high speed BiCMOS 3. 3V powered, single transceiver that meets both the RS-485 and RS-422 standards for balanced communication. Unlike some competitive devices, this Intersil transceiver is specified for 10% tolerance supplies (3V to 3. 6V). Data rates up to 30Mbps are achievable by using this transceiver, which features higher slew rates. Logic inputs (e. g. , DI and DE) accept signals in excess of 5. 5V, making them compatible with 5V logic families. Receiver (Rx) inputs feature a fail-safe if open design, which ensures a logic high output if Rx inputs are floating, and the ISL43485 presents a single unit load to the RS-485 bus, which allows up to 32 transceivers on the network. Driver (Tx) outputs are short circuit protected, even for voltages exceeding the power supply voltage. Additionally, on-chip thermal shutdown circuitry disables the Tx outputs to prevent damage if power dissipation becomes excessive.
Parameters
| Attributes | Value |
|---|---|
| Temp. Range (°C) | -40 to +85°C |
| Devices Allowed on Bus | 32 |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| SOICN | 4.9 x 3.9 x 0.00 | 8 | 1.3 |
Applications
- SCSI "Fast 20" Drivers and Receivers
- Factory Automation
- Data Loggers
- Security Networks
- Building Environmental Control Systems
- Industrial/Process Control Networks
- Level Translators
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ISL43485IBZ | Active | Available | In Stock | RoHS:EN | SOIC | 1ku | $1.34 | 8# | Tube | 3 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C | MALAYSIA, TAIWAN | USA |
| ISL43485IBZ-T | Active | N/A | In Stock | RoHS:EN | SOIC | 1ku | $1.34 | 8# | Reel | 3 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +85°C | MALAYSIA, TAIWAN | USA |
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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 PaperIndustrial PC designs increasingly demand compact form factors and flexible communication interfaces. This paper explores how modern dual-protocol transceivers support both RS-232 and RS-485 standards while offering high integration and advanced configuration options. It also presents application examples that illustrate their versatility in industrial systems.View More (13)
Application Notes & White Papers (13)
- Product Change NoticePDF 266 KB Jun 04, 2020
- Product AdvisoryPDF 106 KB PA16061 Jun 08, 2016
- Product Change NoticePDF 398 KB PCN15046 Jan 07, 2016
- Product Change NoticePDF 108 KB PCN12068 Aug 21, 2012
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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
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