特性
- 4Mbps data rate
- 2.5kVRMS isolation per UL 1577
- 600VRMS working voltage per VDE 0884
- 3V to 5V power supplies
- Single unit load receiver input
- Driver drives up to 150 unit loads
- 50kV/μs (typical), 30kV/μs (minimum) common-mode transient immunity
- 44000 years barrier life
- 15kV ESD bus-pin protection
- Thermal shutdown protection
- -40 °C to +85 °C temperature range
- Meets or exceeds ANSI RS-485
- 16 Ld QSOP and 0.3" true 8mm 16 Ld SOIC packages
- UL 1577 recognized
- VDE V0884-10 certified
ISL32704E Functional Diagram
描述
The ISL32704E is a galvanically isolated, differential bus transceiver designed for bidirectional data transmission and meeting the RS-485 and RS-422 standards for balanced communication. Each of the bus terminals, A and B, is protected against ±15kV ESD strikes without latch-up. The device uses giant magnetoresistance (GMR) as isolation technology. A unique ceramic/polymer composite barrier provides excellent isolation and virtually unlimited barrier life. The part is available in a 16 Ld QSOP package offering unprecedented miniaturization, and in a 16 Ld wide-body SOIC package providing true 8mm creepage distance. The ISL32704E delivers a minimum differential output voltage of 1. 5V into a 54Ω differential load for excellent data integrity over long cable lengths. The device is compatible with 3V and 5V input supplies, allowing interface to standard microcontrollers without additional level shifting. Current limiting and thermal shutdown features protect against output short circuits and bus contention that may cause excessive power dissipation. Receiver inputs feature a “fail-safe if open” design, ensuring a logic high R-output if A/B are floating.
应用
- Factory automation
- Security networks
- Building environmental control systems
- Industrial/Process control networks
- Level translators (i.e., RS-232 to RS-485)
| Part Number | Status | Samples | Stock | Package | Carrier Type | MOQ |
|---|---|---|---|---|---|---|
| ISL32704EIAZ | Obsolete | N/A | Out of Stock | QSOP | Tube | 720 |
| ISL32704EIAZ-T | Obsolete | N/A | Out of Stock | QSOP | Reel | 2500 |
| ISL32704EIAZ-T7A | Obsolete | N/A | Out of Stock | QSOP | Reel | 250 |
| ISL32704EIBZ | Obsolete | N/A | Out of Stock | SOICW | Tube | 920 |
| ISL32704EIBZ-T | Obsolete | N/A | Out of Stock | SOICW | Reel | 1000 |
| ISL32704EIBZ-T7A | Obsolete | N/A | In Stock | SOICW | Reel | 250 |
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- 应用说明英语PDF 365 KB AN1978 2023年4月12日AI 生成的摘要: 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.
- 应用说明英语PDF 207 KB an1985 2022年8月19日AI 生成的摘要: 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.
- 应用说明英语PDF 474 KB AN1979 2022年8月16日AI 生成的摘要: 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.
- 应用说明英语PDF 178 KB r15an0002eu-rs-485-transient-protection 2019年10月28日
- 培训资料英语PDF 156 KB tb506 2019年6月25日The 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.
- 应用说明英语PDF 513 KB an1991 2018年3月06日AI 生成的摘要: The document explains the design of LED drive circuits for high-speed digital optocouplers in RS-485 interfaces, focusing on common-mode rejection (CMR) improvement by balancing impedance with two resistors. It details an isolated RS-485 interface using PS9924 optocouplers and ISL3155 transceivers, highlighting dominant/recessive mode operation and bus arbitration. It provides calculations for current setting resistors and collector resistors to optimize performance, minimize propagation delay, and reduce pulse width distortion for reliable data transmission up to 10Mbps.
- 白皮书英语PDF 437 KB rs-485-isolator-raises-the-bar 2018年3月02日Isolation protects electronics and humans from high voltages and eliminates ground loops in data links. This paper explores RS-485 interfaces, showing how isolation enhances tolerance to large common-mode voltages. It introduces a GMR-based RS-485 isolator offering sub-nanosecond propagation, high-speed performance, radiation immunity, and suitability for industrial, telecom, medical, space, and military systems.
- 产品咨询英语PDF 180 KB PA18003 2018年2月08日
- 应用说明英语PDF 826 KB an1990 2018年1月26日AI 生成的摘要: J1708 messages consist of Message Identification characters, data characters, and a checksum, with lengths from 2 to 21 characters. Each character uses 10 bits following the 8-N-1 UART format. Messages have assigned priorities affecting bus access time, where higher priority messages access the bus faster. Collision detection occurs when multiple nodes transmit simultaneously, triggering retry procedures. Modern microcontrollers like Renesas RL78 support fault-protected bus nodes using transceivers such as the ISL32455E, which offers high immunity to overvoltage and wide common-mode voltage range protection.
- 应用说明英语PDF 769 KB an1988 2017年6月27日AI 生成的摘要: Long-distance RS-485 networks use multiple bus segments connected by half-duplex repeaters to extend coverage while maintaining deterministic timing. Large area networks employ a backbone bus with branching segments to support many nodes over wide areas. Half-duplex repeaters consist of two transceivers controlling each other to drive the bus voltage actively, using time-delay circuits to prevent signal glitches and data errors during switching. This design ensures stable communication regardless of data rate or packet length.
- 应用说明英语PDF 443 KB an1987 2017年4月27日AI 生成的摘要: The document explains the external fail-safe biasing method for RS-485 isolated long haul buses, focusing on maintaining a constant differential voltage across the bus during idle conditions. It details the lumped equivalent circuit model, resistor calculations for line termination, and differential loading requirements. The text includes formulas for determining bias resistor values based on cable length, resistance, and voltage parameters, and provides a calculation example for a 1600m bus segment. It also discusses maximum transceiver loading based on unit load ratings.
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- 应用说明英语PDF 365 KB AN1978 2023年4月12日AI 生成的摘要: 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.
- 应用说明英语PDF 207 KB an1985 2022年8月19日AI 生成的摘要: 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.
- 应用说明英语PDF 474 KB AN1979 2022年8月16日AI 生成的摘要: 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.
- 应用说明英语PDF 178 KB r15an0002eu-rs-485-transient-protection 2019年10月28日
- 应用说明英语PDF 513 KB an1991 2018年3月06日AI 生成的摘要: The document explains the design of LED drive circuits for high-speed digital optocouplers in RS-485 interfaces, focusing on common-mode rejection (CMR) improvement by balancing impedance with two resistors. It details an isolated RS-485 interface using PS9924 optocouplers and ISL3155 transceivers, highlighting dominant/recessive mode operation and bus arbitration. It provides calculations for current setting resistors and collector resistors to optimize performance, minimize propagation delay, and reduce pulse width distortion for reliable data transmission up to 10Mbps.查看更多 (17)
应用说明和白皮书 (17)
- 产品咨询英语PDF 180 KB PA18003 2018年2月08日
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- 培训资料英语PDF 156 KB tb506 2019年6月25日The 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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