Features
- IEC61000 ESD protection (RS-485 inputs): ±16.5kV
- Class 3 ESD on all other pins: >8kV HBM
- Wide supply range: 3.0V to 5.5V
- Wide common-mode range: -7V to +12V
- Low part-to-part propagation delay tolerance: 8ns (maximum)
- Specified for +125°C operation
- Fail-safe open Rx inputs
- 1/4 unit load allows 128 devices on the bus
- Available in industry standard pinout
- High data rate of up to 80Mbps
- Low shutdown supply current: 15µA
- Tri-statable Rx outputs
- 5V tolerant logic inputs when VCC = 3.3V
- RoHS Compliant
RAA7884QR, RAA7884QT Diagram Block
Description
The RAA7884QR is a ±16.5kV IEC61000-4-2 ESD protected, 3.0V to 5.5V powered, quad receiver designed for balanced communication using the RS-485 and RS-422 standards. With low input currents (±200µA), the receiver presents a 1/4 unit load to the RS-485 bus and allows up to 128 receivers on the bus.
The RAA7884QR is a high data rate receiver that operates at data rates up to 80Mbps. With an 8ns maximum propagation delay skew (tolerance), it ensures excellent part-to-part matching. The receiver outputs are tri-statable and include a hot plug feature to keep them disabled during power-up and power-down.
Parameters
| Attributes | Value |
|---|---|
| Temp. Range (°C) | -40 to +105°C |
| Devices Allowed on Bus | 128 |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| SOICN | 9.9 x 3.9 x 0.00 | 16 | 1.3 |
Applications
- Telecom equipment
- Motor controllers/encoders
- Programmable logic controllers
- Industrial/process control networks
| Part Number | Status | Samples | Stock | RoHS | Package | Budgetary Price (USD) | Lead Count (#) | Carrier Type | Moisture Sensitivity Level (MSL) | Data Rate (Mbps) | Supply Voltage Vcc (V) | Pb (Lead) Free | Pb Free Category | Country of Assembly | Country of Wafer Fabrication |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RAA7884QR4GSP#AB0 | Active | Available | In Stock | RoHS:EN | SOIC | 1ku | $1.34 | 16# | Tube | 3 | 80 | 5.5 - 5.5 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | MALAYSIA, TAIWAN | USA |
| RAA7884QR4GSP#HB0 | Active | N/A | In Stock | RoHS:EN | SOIC | 1ku | $1.34 | 16# | Reel | 3 | 80 | 4.5 - 5.5 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | MALAYSIA, TAIWAN | USA |
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- TrainingPDF 719 KB R15TB0008EU0100 Rev.1.00 Dec 18, 2023
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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.
- Technical BriefPDF 188 KB R70TB0002EU0100 Rev.1.00 May 17, 2022
- Application NotePDF 290 KB r15an0004eu-rs-485 Jul 23, 2020AI-generated Summary: This document explains how to measure the length and characteristic impedance of data transmission cables, such as CAT-5, used in RS-485 networks. It details a straightforward method based on transmission line principles, using pulse reflection to determine cable length and impedance. The procedure involves generating a pulse, observing reflections on an oscilloscope, and adjusting termination resistance to match the cable's characteristic impedance, preventing signal reflections. The method applies to twisted pair cables and coaxial cables, ensuring proper cable termination and signal integrity in cost-effective network designs.
- Application NotePDF 677 KB an9769 Jul 15, 2020AI-generated Summary: Voltage transients in electrical circuits arise from sudden energy releases, either internally stored or externally induced, causing overvoltages that can damage components. Repeatable transients include switching spikes and transformer energizing effects, while random transients stem from power system faults, lightning, or switching loads. Protection requires dissipating transient energy and maintaining low voltage levels. Transients affect semiconductors, electromechanical contacts, and insulation, potentially causing failure or degradation. Understanding transient sources, characteristics, and effects guides effective suppression and design for reliable electronic systems.
- TrainingPDF 150 KB r15zz0002eu-rs-485-driver-power-consumption Mar 24, 2020This tech brief explains how to calculate the power dissipation of a RS-485 driver under a load condition.
- TrainingPDF 165 KB r15zz0001eu-rs-422-driver-power-consumption Mar 23, 2020This tech brief explains how to calculate the power dissipation of an RS-422 driver under a load condition.
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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 290 KB r15an0004eu-rs-485 Jul 23, 2020AI-generated Summary: This document explains how to measure the length and characteristic impedance of data transmission cables, such as CAT-5, used in RS-485 networks. It details a straightforward method based on transmission line principles, using pulse reflection to determine cable length and impedance. The procedure involves generating a pulse, observing reflections on an oscilloscope, and adjusting termination resistance to match the cable's characteristic impedance, preventing signal reflections. The method applies to twisted pair cables and coaxial cables, ensuring proper cable termination and signal integrity in cost-effective network designs.
- Application NotePDF 677 KB an9769 Jul 15, 2020AI-generated Summary: Voltage transients in electrical circuits arise from sudden energy releases, either internally stored or externally induced, causing overvoltages that can damage components. Repeatable transients include switching spikes and transformer energizing effects, while random transients stem from power system faults, lightning, or switching loads. Protection requires dissipating transient energy and maintaining low voltage levels. Transients affect semiconductors, electromechanical contacts, and insulation, potentially causing failure or degradation. Understanding transient sources, characteristics, and effects guides effective suppression and design for reliable electronic systems.View More (13)
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