Features
- 40Mbps data rate
- 6kVRMS isolation/1000VRMS working voltage
- 12.8kV surge immunity
- 1/5 unit load allows up to 160 devices on the bus
- 3V to 5V power supplies
- 20ns propagation delay
- 5ns pulse skew
- 50kV/μs common-mode transient immunity
- 10kV ESD protection
- Low EMC footprint
- Thermal shutdown protection
- -40°C to +85°C temperature range
- Meets or exceeds ANSI RS-485 and ISO 8482:1987(E)
- 0.3" true 8mm 16 Ld SOICW package
- UL 1577 recognized
- VDE V 0884-11 (certification pending)
ISL32745E Functional Diagram
Description
The ISL32745E is a galvanically isolated, high-speed differential bus transceiver, designed for full-duplex data communication on balanced transmission lines. The device uses Giant Magnetoresistance (GMR) as its isolation technology. The part is available in a 16 Ld SOICW package with true 8mm creepage distance. The ISL32745E delivers a minimum differential output voltage of 2. 1V across a 54Ω differential load for high noise immunity and excellent data integrity. A unique ceramic/polymer composite barrier provides 6kV reinforced isolation and 44, 000 years of barrier life. The device is compatible with 3V and 5V input supplies, allowing a simple interface to local controllers. Current limiting and thermal shutdown features protect against output short circuits and bus contention that may cause excessive power dissipation. Receiver inputs are a full fail-safe design, ensuring a logic high R-output if A/B are open (floating) or shorted.
| Part Number | Status | Samples | Stock | Package | Carrier Type | MOQ |
|---|---|---|---|---|---|---|
| ISL32745EIBZ | Obsolete | N/A | In Stock | SOICW | Tube | 920 |
| ISL32745EIBZ-T | Obsolete | N/A | In Stock | SOICW | Reel | 1000 |
| ISL32745EIBZ-T7A | Obsolete | N/A | In Stock | SOICW | Reel | 250 |
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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
- 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.
- Application NotePDF 513 KB an1991 Mar 06, 2018AI-generated Summary: 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.
- Application NotePDF 826 KB an1990 Jan 26, 2018AI-generated Summary: 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.
- Application NotePDF 769 KB an1988 Jun 27, 2017AI-generated Summary: 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.
- Application NotePDF 443 KB an1987 Apr 27, 2017AI-generated Summary: 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.
- Application NotePDF 582 KB an1986 Apr 24, 2017AI-generated Summary: The document explains the design of external fail-safe biasing networks for RS-485 communication systems, focusing on short network distances under 100 meters. It details resistor calculations to ensure proper line termination, impedance matching, and compliance with RS-485 common-mode load specifications. The text provides equations to determine bias resistor values and addresses the impact of additional common-mode loading on the maximum number of transceiver unit loads supported by the bus.
- Application NotePDF 440 KB an1989 Apr 19, 2017AI-generated Summary: RS-485 is a bidirectional multipoint interface allowing multiple drivers on the same bus, controlled by driver enable pins to avoid contention. It distinguishes between differential and common-mode bus loading, with a maximum differential load of 54Ω and common-mode loading of 32 unit loads (375Ω). Modern transceivers have fractional unit load ratings, increasing the number of devices on the bus. RS-422 drivers are unsuitable for multipoint applications due to limited common-mode range, bus contention risks, and high drive currents. RS-485 drivers use Schottky diodes to extend common-mode range from -7V to +12V, preventing data line clamping issues seen in RS-422.
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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
- Application NotePDF 513 KB an1991 Mar 06, 2018AI-generated Summary: 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.View More (13)
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- 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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