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SN65HVD21PG4

SN65HVD21PG4

  • 厂商:

    BURR-BROWN(德州仪器)

  • 封装:

    DIP8_300MIL

  • 描述:

    IC TXRX RS485 EXT MODE 8-DIP

  • 数据手册
  • 价格&库存
SN65HVD21PG4 数据手册
SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 SN65HVD2x Extended Common-Mode RS-485 Transceivers 1 Features 3 Description • The transceivers in the SN65HVD2x family offer performance far exceeding typical RS-485 devices. In addition to meeting all requirements of the TIA/EIA‑485-A standard. The SN65HVD2x family operates over an extended range of common-mode voltages and has features such as high ESD protection, wide receiver hysteresis, and failsafe operation. This family of devices is designed for longcable networks, and other applications where the environment is too harsh for ordinary transceivers. • • • • • • Common-mode voltage range (–20 V to 25 V) more than doubles TIA/EIA-485 requirement Receiver equalization extends cable length, signaling rate (SN65HVD2[3,4]) Reduced unit-load for up to 256 nodes Bus I/O protection to over 16-kV HBM Failsafe receiver for open-circuit, short-circuit, and idle-bus conditions Low standby supply current 1 µA (maximum) More than 100 mV receiver hysteresis 2 Applications • Long cable solutions – Factory automation – Security networks – Building HVAC Severe electrical environments – Electrical power inverters – Industrial drives – Avionics These devices combine a 3-state differential driver and a differential receiver that operate from a single 5-V power supply. The driver differential outputs and the receiver differential inputs are connected internally to form a differential bus port that offers minimum loading to the bus. This port features an extended common-mode voltage range, making the device suitable for multipoint applications over long cable runs. Package Information PACKAGE(1) PART NUMBER SN65HVD2x (1) 100 BODY SIZE (NOM) SOIC (8) 4.90 mm × 3.91 mm PDIP (8) 9.81 mm × 6.35 mm For all available packages, see the orderable addendum at the end of the data sheet. -20 V +25 V HVD23 SUPER485 HVD20 Signaling Rate - Mbps • These devices are designed for bidirectional data transmission on multipoint twisted-pair cables. Example applications are digital motor controllers, remote sensors and terminals, industrial process control, security stations, and environmental control systems. 10 HVD24 HVD21 RS485 1 -7 V +12 V HVD22 -20 V -15 V 0.1 10 100 Cable Length - m 1000 -10 V -5 V 0 5V 10 V 15 V 20 V 25 V SN65HVD2x Devices Operate Over a Wider Common-Mode Voltage Range SN65HVD2x Application Space An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 Table of Contents 1 Features............................................................................1 2 Applications..................................................................... 1 3 Description.......................................................................1 4 Revision History.............................................................. 2 5 Description (continued).................................................. 4 6 Device Comparison......................................................... 4 7 Pin Configuration and Functions...................................5 8 Specifications.................................................................. 6 8.1 Absolute Maximum Ratings........................................ 6 8.2 ESD Ratings............................................................... 6 8.3 Recommended Operating Conditions.........................6 8.4 Thermal Information....................................................8 8.5 Driver Electrical Characteristics.................................. 8 8.6 Receiver Electrical Characteristics............................. 9 8.7 Driver Switching Characteristics................................. 9 8.8 Receiver Switching Characteristics...........................10 8.9 Receiver Equalization Characteristics...................... 10 8.10 Power Dissipation................................................... 11 8.11 Typical Characteristics............................................ 12 9 Parameter Measurement Information.......................... 14 10 Detailed Description....................................................18 10.1 Overview................................................................. 18 10.2 Functional Block Diagram....................................... 18 10.3 Feature Description.................................................18 10.4 Device Functional Modes........................................20 11 Application and Implementation................................ 23 11.1 Application Information............................................23 11.2 Typical Application.................................................. 23 12 Power Supply Recommendations..............................25 13 Layout...........................................................................26 13.1 Layout Guidelines................................................... 26 13.2 Layout Example...................................................... 26 14 Device and Documentation Support..........................27 14.1 Receiving Notification of Documentation Updates..27 14.2 Support Resources................................................. 27 14.3 Trademarks............................................................. 27 14.4 Electrostatic Discharge Caution..............................27 14.5 Glossary..................................................................27 15 Mechanical, Packaging, and Orderable Information.................................................................... 27 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision F (November 2016) to Revision G (August 2022) Page • Deleted the Available Options table....................................................................................................................4 • Changed the D (SOIC) values in the Thermal Information ................................................................................ 8 Changes from Revision E (May 2010) to Revision F (November 2016) Page • Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section................... 1 • Deleted Ordering Information table; see POA at the end of the data sheet....................................................... 1 • Added maximum temperature value (150°C) to the Storage temperate, Tstg parameter................................... 6 Changes from Revision D (April 2005) to Revision E (May 2010) Page • Replaced the Dissipation Rating table with the Thermal Information table........................................................ 8 • Changed IO - Added test condition and values per device number (Driver Electrical Characteristics table)...... 8 • Changed the Thermal Characteristics table to Power Dissipation table........................................................... 11 • Added the TEST MODE DRIVER DISABLE section........................................................................................ 21 Changes from Revision C (September 2003) to Revision D (April 2005) Page • Added Receiver output current, IO to the Absolute Maximum Ratings table...................................................... 6 Changes from Revision B (June 2003) to Revision C (September 2003) Page • Added the Thermal Information table................................................................................................................. 8 • Added the Theory of Operation section............................................................................................................ 18 • Added the Noise Considerations for Equalized Receivers section...................................................................23 2 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 Changes from Revision A (March 2003) to Revision B (June 2003) Page • Added VIK Typical Value of 0.75 V (Driver Electrical Characteristics table)........................................................8 • Deleted VIT(F+) – VCM = –20 V to 25 V Minimum value (Receiver Electrical Characteristics table)...................9 • Added the Receiver Equalization Characteristics table.................................................................................... 10 • Added Figure 8-6, Figure 8-7, and Figure 8-8 to the Typical Characteristics .................................................. 12 • Changed A Input circuit in the Equivalent Input and Output Schematic Diagrams ..........................................22 • Changed the Integrated Receiver Equalization Using the SN65HVD23 section.............................................. 24 Changes from Revision * (December 2002) to Revision A (March 2003) Page • Changed tPZH, tPHZ, tPZL, and tPLZ - From a maximum value of 120 to include typical and maximum values for each entry (Receiver Switching Characteristics table)..................................................................................... 10 • Changed tPZH, tPHZ, tPZL, and tPLZ - From a maximum value of 120 to include typical and maximum values for each entry (Receiver Switching Characteristics table)..................................................................................... 10 Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 3 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 5 Description (continued) The SN65HVD20 device provides high signaling rate (up to 25 Mbps) for interconnecting networks of up to 64 nodes. The SN65HVD21 device allows up to 256 connected nodes at moderate data rates (up to 5 Mbps). The driver output slew rate is controlled to provide reliable switching with shaped transitions which reduce high-frequency noise emissions. The SN65HVD22 device has controlled driver output slew rate for low radiated noise in emission-sensitive applications and for improved signal quality with long stubs. Up to 256 SN65HVD22 nodes can be connected at signaling rates up to 500 kbps. The SN65HVD23 device implements receiver equalization technology for improved jitter performance on differential bus applications with data rates up to 25 Mbps at cable lengths up to 160 meters. The SN65HVD24 device implements receiver equalization technology for improved jitter performance on differential bus applications with data rates from 1 Mbps to 10 Mbps at cable lengths up to 1000 meters. The receivers include a failsafe circuit that provides a high-level output within 250 microseconds after loss of the input signal. The most common causes of signal loss are disconnected cables, shorted lines, or the absence of any active transmitters on the bus. This feature prevents noise from being received as valid data under these fault conditions. This feature may be used for Wired-OR bus signaling. The SN65HVD2x devices are characterized for operation temperatures from –40°C to 85°C. 6 Device Comparison Table 6-1. Product Selection Guide PART NUMBERS NODES MARKING SN65HVD20 Up to 50 m at 25 Mbps Up to 64 D: VP20, P: 65HVD20 SN65HVD21 Up to 150 m at 5 Mbps (with slew rate limit) Up to 256 D: VP21, P: 65HVD21 SN65HVD22 Up to1200 m at 500 kbps (with slew rate limit) Up to 256 D: VP22, P: 65HVD22 SN65HVD23 Up to 160 m at 25 Mbps (with receiver equalization) Up to 64 D: VP23, P: 65HVD23 SN65HVD24 Up to 500 m at 3 Mbps (with receiver equalization) Up to 256 D: VP24, P: 65HVD24 (1) 4 CABLE LENGTH AND SIGNALING RATE(1) Distance and signaling rate predictions based upon Belden 3105A cable and 15% eye pattern jitter. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 7 Pin Configuration and Functions R 1 8 VCC RE 2 7 B DE 3 6 A D 4 5 GND Not to scale Figure 7-1. D or P Package, 8-Pin SOIC or PDIP (Top View) Table 7-1. Pin Functions PIN NAME NO. I/O DESCRIPTION A 6 Bus input and output Driver output or receiver input (complementary to B) B 7 Bus input and output Driver output or receiver input (complementary to A) D 4 Digital input Driver data input DE 3 Digital input Driver enable, active high GND 5 Reference potential Local device ground R 1 Digital output Receive data output RE 2 Digital input VCC 8 Supply Copyright © 2022 Texas Instruments Incorporated Receiver enable, active low 4.5-V to 5.5-V supply Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 5 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 8 Specifications 8.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) Supply voltage(2) Voltage at any bus I/O terminal Voltage input, transient pulse A, B Voltage input D, DE, RE (through 100 Ω, see Figure 9-16) Receiver output current MIN MAX UNIT –0.5 7 V –27 27 V –60 60 V –0.5 VCC + 0.5 V –10 10 mA See Power Dissipation Ratings Continuous total power dissipation Junction temperature, TJ 150 °C Storage temperature, Tstg 150 °C (1) (2) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage values, except differential I/O bus voltages, are with respect to network ground terminal. 8.2 ESD Ratings VALUE Human-body model (HBM), per ANSI/ESDA/ JEDEC JS-001(1) V(ESD) (1) (2) (3) Electrostatic discharge All pins except 5, 6, and 7 ±5000 Pins 5, 6, and 7 ±16000 Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1500 Machine Model (MM) (3) ±200 UNIT V Tested in accordance with JEDEC Standard 22, Test Method A114-A. Tested in accordance with JEDEC Standard 22, Test Method C101. Tested in accordance with JEDEC Standard 22, Test Method A115-A 8.3 Recommended Operating Conditions VCC MIN NOM MAX Supply voltage 4.5 5 5.5 V Voltage at any bus I/O terminal A, B –20 25 V 2 VCC V 0 0.8 V V VIH High-level input voltage VIL Low-level input voltage VID Differential input voltage Output current 6 Submit Document Feedback D, DE, RE A with respect to B Driver Receiver –25 25 –110 110 –8 8 UNIT mA Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 8.3 Recommended Operating Conditions (continued) MIN Driver enabled (DE at VCC), Receiver enabled (RE at 0 V), No load, VI = 0 V or VCC ICC Supply current Driver enabled (DE at VCC), Receiver disabled (RE at VCC), No load, VI = 0 V or VCC Driver disabled (DE at 0 V), Receiver enabled (RE at 0 V), No load Driver disabled (DE at 0 V), Receiver disabled (RE at VCC) D open NOM MAX SN65HVD20 6 9 SN65HVD21 8 12 SN65HVD22 6 9 SN65HVD23 7 11 SN65HVD24 10 14 SN65HVD20 5 8 SN65HVD21 7 11 SN65HVD22 5 8 SN65HVD23 5 9 SN65HVD24 8 12 SN65HVD20 4 7 SN65HVD21 5 8 SN65HVD22 4 7 SN65HVD23 4.5 9 SN65HVD24 5.5 10 All SN65HVD2x UNIT mA 1 µA TA Operating free-air temperature(1) –40 85 °C TJ Junction temperature –40 130 °C (1) Maximum free-air temperature operation is allowed as long as the device recommended junction temperature is not exceeded. Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 7 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 8.4 Thermal Information SN65HVD2x THERMAL METRIC(1) D (SOIC) P (PDIP) 8 PINS 8 PINS UNIT RθJA Junction-to-ambient thermal resistance 110.7 52.5 °C/W RθJC(top) Junction-to-case(top) thermal resistance 49.9 57.6 °C/W RθJB Junction-to-board thermal resistance 56.7 38.6 °C/W ψJT Junction-to-top characterization parameter 6.0 19.1 °C/W ψJB Junction-to-board characterization parameter 55.9 31.9 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. 8.5 Driver Electrical Characteristics over recommended operating conditions (unless otherwise noted).(1) PARAMETER Input clamp voltage II = –18 mA VO Open-circuit output voltage A or B, No load |VOD(SS)| Steady-state differential output voltage MIN TYP –1.5 0.75 0 3.3 4.2 RL = 54 Ω, See Figure 9-1 1.8 2.5 With common-mode loading, See Figure 9-2 1.8 Change in steady-state differential output voltage between logic states See Figure 9-1 and Figure 9-3 VOC(SS) Steady-state common-mode output voltage See Figure 9-1 ∆VOC(SS) Change in steady-state common-mode output voltage, VOC(H) – VOC(L) See Figure 9-1 and Figure 9-4 –0.1 VOC(PP) Peak-to-peak common-mode output voltage, VOC(MAX) – VOC(MIN) RL = 54 Ω, CL = 50 pF, See Figure 9-1 and Figure 9-4 0.35 VOD(RING) Differential output voltage over and under shoot RL = 54 Ω, CL = 50 pF, See Figure 9-5 II Input current D, DE IO Output current with power off. High impedance state output current. IOS Short-circuit output current COD Differential output capacitance –0.1 2.1 MAX 2.5 V 0.1 V 2.9 V 0.1 V V 10% 100 VO = –7 V to 12 V, Other input = 0 V SN65HVD2[0,3] –400 500 SN65HVD2[1,2,4] –100 125 VO = –20 V to 25 V, Other input = 0 V SN65HVD2[0,3] –800 1000 SN65HVD2[1,2,4] V VCC –100 VO = –20 V to 25 V, See Figure 9-9 UNIT V VCC No load (open circuit) Δ|VOD(SS)| (1) 8 TEST CONDITIONS VIK µA µA –200 250 –250 250 mA 20 pF All typical values are at VCC = 5 V and 25°C. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 8.6 Receiver Electrical Characteristics over recommended operating conditions (unless otherwise noted)(1) PARAMETER TEST CONDITIONS VIT(+) Positive-going differential input voltage threshold VIT(–) Negative-going differential input voltage threshold VHYS Hysteresis voltage (VIT+ – VIT–) VIT(F+) Positive-going differential input failsafe voltage threshold See Figure 9-15 VIT(F–) Negative-going differential input failsafe voltage threshold See Figure 9-15 VIK Input clamp voltage II = –18 mA VOH High-level output voltage VID = 200 mV, IOH = –8 mA, See Figure 9-11 VOL Low-level output voltage VID = –200 mV, IOL = 8 mA, See Figure 9-11 II(BUS) Bus input current (power on or power off) II Input current VO = 0.4 V, IO = 8 mA VCM = –7 V to 12 V Input resistance CID Differential input capacitance TYP MAX 60 200 –200 –60 100 130 40 120 200 120 250 –40 VCM = –20 V to 25 V VCM = –7 V to 12 V –200 –120 VCM = –20 V to 25 V –250 –120 4 SN65HVD2[0,3] –400 SN65HVD2[1,2,4] –100 125 VI = –20 to 25 V, Other input = 0 V SN65HVD2[0,3] –800 1000 –200 250 100 SN65HVD2[1,2,4] 96 VID = 0.5 + 0.4 sine (2π × 1.5 × 106t) mV V 500 –100 24 mV V 0.4 SN65HVD2[0,3] mV V VI = –7 to 12 V, Other input = 0 V SN65HVD2[1,2,4] UNIT mV –1.5 RE RI (1) See Figure 9-10 MIN VO = 2.4 V, IO = –8 mA µA µA kΩ 20 pF All typical values are at VCC = 5 V and 25°C. 8.7 Driver Switching Characteristics over recommended operating conditions (unless otherwise noted)(1) PARAMETER TEST CONDITIONS SN65HVD2[0,3] tPLH, tPHL Differential output propagation delay, low-to-high and high-to-low RL = 54 Ω, CL = 50 pF, See Figure 9-3 SN65HVD2[1,4] SN65HVD22 tr, tf Differential output rise time and fall time RL = 54 Ω, CL = 50 pF, See Figure 9-3 tPZH, tPHZ tPZL, tPLZ RE at 0 V, See Figure 9-6 Propagation delay time, high-impedance-to-high-level output and high-level output-to-high-impedance RE at 0 V, See Figure 9-7 td(standby) Time from an active differential output to standby td(wake) Wake-up time from standby to an active differential output tsk(p) Pulse skew | tPLH – tPHL| TYP MAX 6 10 20 20 32 60 160 280 500 12 SN65HVD2[0,3] 2 6 SN65HVD2[1,4] 20 40 60 175 400 600 SN65HVD22 Propagation delay time, high-impedance-to-high-level output and high-level output-to-high-impedance MIN SN65HVD2[0,3] 40 SN65HVD2[1,4] 100 SN65HVD22 300 SN65HVD2[0,3] 40 SN65HVD2[1,4] 100 SN65HVD22 300 RE at VCC, See Figure 9-8 SN65HVD2[0,3] ns ns ns ns 2 µs 8 µs 2 SN65HVD2[1,4] 6 SN65HVD22 (1) UNIT ns 50 All typical values are at VCC = 5 V and 25°C Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 9 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 8.8 Receiver Switching Characteristics over recommended operating conditions (unless otherwise noted) PARAMETER TEST CONDITIONS TYP MAX SN65HVD2[0,3] MIN 16 35 SN65HVD2[1,2,4] 25 50 2 4 90 120 16 35 90 120 16 35 UNIT Propagation delay time, low-to-high level output and high-to low level output See Figure 9-11 Receiver output rise time Receiver output fall time See Figure 9-11 Receiver output enable time to high level and disable time from high level See Figure 9-12 tPLZ Receiver output enable time to low level and disable time from low level See Figure 9-13 tr(standby) Time from an active receiver output to standby See Figure 9-14, DE at 0 V 2 µs tr(wake) Wake-up time from standby to an active receiver output See Figure 9-14, DE at 0 V 8 µs tsk(p) Pulse skew |tPLH – tPHL| tp(set) Delay time, bus fail to failsafe set See Figure 9-15, pulse rate = 1 kHz 250 tp(reset) Delay time, bus recovery to failsafe reset See Figure 9-15, pulse rate = 1 kHz 50 tPLH tPHL tr tf tPZH tPHZ tPZL ns ns ns ns 5 ns 350 µs ns 8.9 Receiver Equalization Characteristics over recommended operating conditions (unless otherwise noted)(1) (2) PARAMETER TEST CONDITIONS 0m 100 m 25 Mbps 150 m 200 m 200 m tj(pp) Peudo-random NRZ code with a bit pattern length of 216 – 1, Peak-to-peak eye-pattern jitter Beldon 3105A cable, See Figure 10-2 10 Mbps 300 m 5 Mbps 3 Mbps 1 Mbps (1) (2) 10 250 m 500 m 500 m 1000 m TYP SN65HVD23 2 SN65HVD20 6 SN65HVD23 3 SN65HVD20 15 SN65HVD23 4 SN65HVD20 27 SN65HVD23 8 SN65HVD20 22 SN65HVD23 8 SN65HVD20 34 SN65HVD23 15 SN65HVD20 49 SN65HVD23 27 SN65HVD21 128 SN65HVD24 18 SN65HVD20 93 SN65HVD21 103 SN65HVD23 90 SN65HVD24 16 SN65HVD21 216 SN65HVD24 62 UNIT ns ns ns ns ns ns ns ns ns ns The SN65HVD20 and SN65HVD21 do not have receiver equalization, but are specified for comparison. All typical values are at VCC = 5 V, and temperature = 25°C. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 8.10 Power Dissipation PARAMETERS TEST CONDITIONS Typical PD Device power dissipation Worst case TSD VALUE SN65HVD20: 25 Mbps VCC = 5 V, TJ = 25°C, SN65HVD21: 5 Mbps RL = 54 Ω, CL = 50 pF (driver), CL = 15 pF (receiver), SN65HVD22: 500 kbps 50% Duty cycle square-wave signal, SN65HVD23: 25 Mbps Driver and receiver enabled SN65HVD24: 5 Mbps 295 SN65HVD20: 25 Mbps 408 VCC = 5.5 V, TJ = 125°C, SN65HVD21: 5 Mbps RL = 54 Ω, CL = 50 pF, SN65HVD22: 500 kbps CL = 15 pF (receiver), 50% Duty cycle square-wave signal, SN65HVD23: 25 Mbps Driver and receiver enabled SN65HVD24: 5 Mbps Thermal shut down junction temperature Copyright © 2022 Texas Instruments Incorporated UNIT 260 233 mW 302 267 342 300 mW 417 352 170 °C Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 11 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 8.11 Typical Characteristics 150 600 DE = 0 V DE = 0 V 100 Bus Pin Current - m A Bus Pin Current - m A 400 200 VCC = 0 V 0 VCC = 5 V 200 50 VCC = 0 V 0 VCC = 5 V 50 100 400 600 -30 -20 0 -10 10 150 -30 30 20 -20 5 ICC - Supply Current - mA HVD20 VOD - Driver Differential Output Voltage - V VCC = 5 V, DE = RE = VCC, LOAD = 54 Ω, 50 pF 70 65 HVD22 HVD21 60 55 50 45 4.5 VCC = 5.5 V 4 3.5 VCC = 5 V 3 2.5 2 VCC = 4.5 V 1.5 1 0.5 0 40 0.1 10 1 Signaling Rate - Mbps 0 100 Figure 8-3. Supply Current vs Signaling Rate 10 20 30 40 50 60 IL - Driver Load Current - mA 70 80 Figure 8-4. Driver Differential Output Voltage vs Driver Load Current 30 6 VIT(-) 5 VIT(+) 25 VCM = 25 V VCM = 25 V 4 VCM = 0 V 3 VCM = 0 V VCM = 20 V VCM = 20 V 1 VCC = 5 V, TA = 25°C, VIC = 2.5 V, Cable: Belden 3105A HVD20 = 25 Mbps 20 15 10 HVD23 = 25 Mbps 5 0 1 -0.2 Peak-to-Peak Jitter - ns VO - Receiver Output Voltage - V 30 Figure 8-2. SN65HVD2[1,2,4] Bus Pin Current vs Bus Pin Voltage 75 0 -0.1 0.1 VID - Differential Input Voltage - V 0.2 Figure 8-5. Receiver Output Voltage vs Differential Input Voltage 12 20 10 Bus Pin Voltage - V Figure 8-1. SN65HVD2[0,3] Bus Pin Current vs Bus Pin Voltage 2 0 -10 Bus Pin Voltage - V Submit Document Feedback 0 100 120 140 160 Cable Length - m 180 200 Figure 8-6. SN65HVD2[0,3] Peak-to-Peak Jitter vs Cable Length Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 8.11 Typical Characteristics (continued) 130 70 HVD21: 500 m Cable HVD21 = 10 Mbps 110 50 40 HVD20 = 10 Mbps 30 HVD23 = 10 Mbps 20 Peak-to-Peak Jitter - ns Peak-to-Peak Jitter - ns 60 VCC = 5 V, TA = 25°C, VIC = 2.5 V, Cable: Belden 3105A 90 VCC = 5 V, TA = 25°C, VIC = 2.5 V, Cable: Belden 3105A 70 50 30 10 HVD24: 500 m Cable HVD24 = 10 Mbps 0 200 220 240 260 Cable Length - m 280 300 Figure 8-7. SN65HVD2[0,1,3,4] Peak-to-Peak Jitter vs Cable Length Copyright © 2022 Texas Instruments Incorporated 10 3 3.5 4 4.5 Signaling Rate - Mbps 5 Figure 8-8. SN65HVD2[1,4] Peak-to-Peak Jitter vs Signaling Rate Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 13 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 9 Parameter Measurement Information Note Test load capacitance includes probe and jig capacitance (unless otherwise specified). Signal generator characteristics: rise and fall time < 6 ns, pulse rate 100 kHz, 50% duty cycle, ZO = 50 Ω (unless otherwise specified). IO II 27 Ω VOD 0 V or 3 V 50 pF 27 Ω IO VOC Figure 9-1. Driver Test Circuit, VOD and VOC Without Common-Mode Loading 375 Ω IO VOD 0 V or 3 V 60 Ω IO 375 Ω VTEST = -20 V to 25 V VTEST Figure 9-2. Driver Test Circuit, VOD With Common-Mode Loading 3V INPUT VOD RL = 54 Ω Signal Generator 1.5 V 90% 0V tPHL VOD(H) 10% VOD(L) tPLH CL = 50 pF 50 Ω 1.5 V 0V OUTPUT tr tf Figure 9-3. Driver Switching Test Circuit and Waveforms 27 Ω A VA D Signal Generator 50 Ω B 27 Ω ≈ -3.25 V VB 50 pF ≈ -1.75 V VOC(PP) VOC ∆VOC(SS) VOC Figure 9-4. Driver VOC Test Circuit and Waveforms 14 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 VOD(SS) VOD(RING) VOD(PP) 0 V Differential VOD(RING) VOD(SS) VOD(RING) is measured at four points on the output waveform, corresponding to overshoot and undershoot from the VOD(H) and VOD(L) steady state values. Figure 9-5. VOD(RING) Waveform and Definitions A D 0 V or 3 V 3 V if Testing A Output 0 V if Testing B Output DE Signal Generator S1 3V Output B 1.5 V DE CL = 50 pF 1.5 V 0.5 V tPZH RL = 110 Ω 0V VOH Output 2.5 V 50 Ω tPHZ VOff 0 Figure 9-6. Driver Enable and Disable Test, High Output 5V S1 D 0 V or 3 V 0 V if Testing A Output 3 V if Testing B Output DE RL = 110 Ω 3V Output 1.5 V DE 0V CL = 50 pF tPZL Output Signal Generator 1.5 V tPLZ 5V 2.5 V 50 Ω VOL 0.5 V Figure 9-7. Driver Enable and Disable Test, Low Output A 0 V or 3 V D RL = 54 Ω B DE Signal Generator CL = 50 pF VOD 3V DE 1.5 V 0V td(Wake) td(Standby) 1.5 V V OD 0.2 V 50 Ω Figure 9-8. Driver Standby and Wake Test Circuit and Waveforms Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 15 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 IOS VO Voltage Source Figure 9-9. Driver Short-Circuit Test IO VID VO Figure 9-10. Receiver DC Parameter Definitions Signal Generator 50 Ω Input B VID A B Signal Generator 50 Ω IO R CL = 15 pF 1.5 V 50% Input A VO tPLH Output 90% 1.5 V tr 0V tPHL VOH 10% V OL tf Figure 9-11. Receiver Switching Test Circuit and Waveforms VCC VCC D DE A 54 Ω B R RE Signal Generator 1 kΩ 3V 0V RE 1.5 V 0V CL = 15 pF tPZH tPHZ VOH VOH -0.5 V 50 Ω R 1.5 V GND Figure 9-12. Receiver Enable Test Circuit and Waveforms, Data Output High 16 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 0V D DE VCC A 54 Ω B RE 5V 1.5 V 0V CL = 15 pF RE Signal Generator 3V 1 kΩ R tPZL tPLZ VCC 50 Ω 1.5 V R VOL +0.5 V VOL Figure 9-13. Receiver Enable Test Circuit and Waveforms, Data Output Low VCC Switch Down for V(A) = 1.5 V, Switch Up for V(A) = -1.5 V A 1.5 V or -1.5 V R 3V B 1 kΩ RE CL = 15 pF 1.5 V 0V RE Signal Generator tr(Standby) tr(Wake) 50 Ω 5V R 1.5 V VOH VOH 0.5 V VOL +0.5 V VOL 0V Figure 9-14. Receiver Standby and Wake Test Circuit and Waveforms 200 mV -40 mV VID -200 mV -1.5 V Bus Data Valid Region Bus Data Transition Region Bus Data Valid Region tp(SET) tp(RESET) VOH R 1.5 V VOL Figure 9-15. Receiver Active Failsafe Definitions and Waveforms 100 Ω VTEST 0V Pulse Generator, 15 ms Duration, 1% Duty Cycle 15 ms 1.5 ms V TEST Figure 9-16. Test Circuit and Waveforms, Transient Overvoltage Test Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 17 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 10 Detailed Description 10.1 Overview The SN65HVD2x family of devices are RS-485 compliant half-duplex transceivers designed for communication rates up to 500 kbps (SN65HVD22), 3 Mbps (SN65HVD24), 5 Mbps (SN65HVD21), or 25 Mpbs (SN65HVD20 and SN65HVD23). The devices feature extended common-mode range support, which provides immunity to larger ground potential differences that can occur between nodes that communicate over longer distances. The SN65HVD23 and the SN65HVD24 devices feature receiver equalization, which reduces the amount of data-dependent jitter that is introduced by the high-frequency losses associated with long cables. 10.2 Functional Block Diagram (V A-V B ) : Not High + - Bus Input Invalid (VA-V B) : Not Low Timer 250 Ps R RE 1 120 mV + 120 mV Active Filters 2 STANDBY 3 DE 6 D Slew Rate Control 4 7 A B Copyright © 2016, Texas Instruments Incorporated 10.3 Feature Description The SN65HVD2x family of devices integrates a differential receiver and differential driver with additional features for improved performance in electrically-noisy, long-cable, or other fault-intolerant applications. The receiver hysteresis (typically 130 mV) is much larger than found in typical RS-485 transceivers. This helps reject spurious noise signals which would otherwise cause false changes in the receiver output state. Slew rate limiting on the driver outputs (SN65HVD2[1,2,4]) reduces the high-frequency content of signal edges. This decreases reflections from bus discontinuities, and allows longer stub lengths between nodes and the main bus line. Designers must consider the maximum signaling rate and cable length required for a specific application, and choose the transceiver best matching those requirements. When DE is low, the differential driver is disabled, and the A and B outputs are in high-impedance states. When DE is high, the differential driver is enabled, and drives the A and B outputs according to the state of the D inputs. When RE is high, the differential receiver output buffer is disabled, and the R output is in a high-impedance state. When RE is low, the differential receiver is enabled, and the R output reflects the state of the differential bus inputs on the A and B pins. 18 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 If both the driver and receiver are disabled, (DE low and RE high) then all nonessential circuitry, including auxiliary functions such as failsafe and receiver equalization is placed in a low-power standby state. This reduces power consumption to less than 5 µW. When either enable input is asserted, the circuitry again becomes active. In addition to the primary differential receiver, these devices incorporate a set of comparators and logic to implement an active receiver failsafe feature. These components determine whether the differential bus signal is valid. Whenever the differential signal is close to zero volts (neither high nor low), a timer initiates, If the differential input remains within the transition range for more than 250 µs, the timer expires and set the receiver output to the high state. If a valid bus input (high or low) is received at any time, the receiver output reflects the valid bus state, and the timer is reset. Figure 10-1. SN65HVD22 Receiver Operation With 20-V Offset on Input Signal k0 (DC loss) p1 (MHz) k1 p2 (MHz) k2 p3 (MHz) k3 Similar to 160m of Belden 3105A 0.95 0.25 0.3 3.5 0.5 15 1 Similar to 250m of Belden 3105A 0.9 0.25 0.4 3.5 0.7 12 1 Similar to 500m of Belden 3105A 0.8 0.25 0.6 2.2 1 8 1 Similar to 1000m of Belden 3105A 0.6 0.3 1 3 1 6 1 H(s) = k0 (1–k1) + k1p1 (s + p1) (1–k2) + k p 2 2 (s + p2) (1–k3) + Signal Generator k p 3 3 (s + p3) H(s) Figure 10-2. Cable Attenuation Model for Jitter Measurements Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 19 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 10.4 Device Functional Modes The driver and receiver behavior for different input conditions are shown in Table 10-1 and Table 10-2, respectively. Table 10-1. Driver Function Table(1) DEVICE SN65HVD2[0,1,2] SN65HVD2[3,4] (1) INPUT ENABLE D DE A OUTPUTS H H H L L H L H X L Z Z X OPEN Z Z OPEN H H L H H H L B L H L H X L Z Z X OPEN Z Z OPEN H L H Legend: H = high level, L = low level, X = don’t care, Z = high impedance (off), ? = indeterminate Table 10-2. Receiver Function Table(1) DIFFERENTIAL INPUT VID = (VA – VB) ENABLE RE OUTPUT R 0.2 V ≤ VID L H –0.2 V < VID < 0.2 V L H(2) VID ≤ –0.2 V L L X H Z X OPEN Z Open circuit L H Short Circuit L H Idle (terminated) bus L H (1) (2) H = high level, L = low level, Z = high impedance (off) If the differential input VID remains within the transition range for more than 250 µs, the integrated failsafe circuitry detects a bus fault, and set the receiver output to a high state. See Figure 9-15. R RE DE D 1 2 3 6 A 7 B 4 Figure 10-3. Logic Diagram 20 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 10.4.1 Test Mode Driver Disable If the input signal to the D pin is such that: 1. the signal has signaling rate above 4 Mbps (for the SN65HVD21 and SN65HVD24), 2. the signal has signaling rate above 6 Mbps (for the SN65HVD20 and SN65HVD23), 3. the signal has average amplitude from 1.2 V to 1.6 V (1.4 V ± 200 mV), or 4. the average signal amplitude remains in this range for 100 µs or longer, then the driver may activate a test-mode during which the driver outputs are temporarily disabled. This can cause loss of transmission of data during the period that the device is in the test-mode. The driver is re-enabled and resumes normal operation whenever the above conditions are not true. The device is not damaged by this test mode. Although rare, there are combinations of specific voltage levels and input data patterns within the operating conditions of the SN65HVD2x family which may lead to a temporary state where the driver outputs are disabled for a period of time. Observations: 1. The conditions for inadvertently entering the test mode are dependent on the levels, duration, and duty cycle of the logic signal input to the D pin. Operating input levels are specified as greater than 2 V for a logic HIGH input, and less than 0.8 V for a logic LOW input. Therefore, a valid steady-state logic input does not cause the device to activate the test mode 2. Only input signals with frequency content above 2 MHz (4 Mbps) have a possibility of activating the test mode. Therefore, this issue should not affect the normal operation of the SN65HVD22 (500 kbps). 3. For operating signaling rates of 4 Mbps (or above), the conditions stated above must remain true over a period of: 4 Mbps ×100 µs = 400 bits. Therefore, a normal short message does not inadvertently activate the test model. 4. One example of an input signal which may cause the test mode to activate is a clock signal with frequency 3 MHz and 50% duty cycle (symmetric HIGH and LOW half-cycles) with logic HIGH levels of 2.4 V and logic LOW levels of 0.4 V. This signal applied to the D pin as a driver input would meet the criteria listed above, and may cause the test-mode to activate, which would disable the driver. This example situation may occur if the clock signal is generated from a microcontroller or logic chip with a 2.7-V supply. Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 21 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 10.4.2 Equivalent Input and Output Schematic Diagrams RE Inputs DE Input D Inputs (HVD20, 21, 22) D Inputs (HVD23, 24) VCC VCC 100 kΩ 1 kΩ 1 kΩ Input Input 100 kΩ 9V 9V A Input B Input VCC VCC R1 R3 R1 R3 Input Input 29 V R2 R2 29 V 29 V A and B Outputs R Output VCC VCC 5Ω Output Output 9V 29 V Figure 10-4. Equivalent Input and Output Schematic Diagrams Table 10-3. Input and Output Resistor Values DEVICE 22 Submit Document Feedback R1, R2 R3 SN65HVD2[0,3] 9 kΩ 45 kΩ SN65HVD2[1,2,4] 36 kΩ 180 kΩ Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 11 Application and Implementation Note Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes, as well as validating and testing their design implementation to confirm system functionality. 11.1 Application Information The SN65HVD2x devices are half-duplex RS-485 transceivers that can be used for bidirectional, multipoint communication at various data rates over differential transmission lines. These devices support a wide commonmode range, allowing for robust communication even in the presence of voltage differences between the reference potentials of different nodes on a network. 11.2 Typical Application Figure 11-1 shows a typical RS-485 application. Transceivers of different nodes are connected to one another over a shared bus. Twisted-pair cabling with a controlled differential impedance is used, and termination resistances are placed at the two ends of the cable to match the transmission line impedance and minimize signal reflections. R R R R R R RE A RE A RE A DE B DE B DE B D D D D D D Copyright © 2016, Texas Instruments Incorporated Figure 11-1. Half-Duplex Transceiver Configurations 11.2.1 Design Requirements As the distances between nodes in an RS-485 network become greater and greater, it becomes more of a challenge to ensure reliable communication. The increased distance often means that the reference (ground) potentials has more of a difference between nodes. These ground potential differences give rise to differences in the common-mode voltages seen by the various transceivers on the bus. Standard RS-485 transceivers are typically specified to operate over a common-mode voltage from –7 V to 12 V, which may be insufficient for larger distances. The SN65HVD2x family of devices extends this range to –20 V to 25 V, allowing for greater communication distances between nodes. Increased cable lengths can lead to increased jitter, especially in links operating at high data rates. This increased jitter is due to the attenuation of the cable, which tends to increase with frequency. Having unequal loss between higher and lower frequencies causes the RS-485 signal to distort, adding some timing deviation (jitter) to the edge crossings of the RS-485 data. If the jitter amplitude exceeds the jitter tolerance of the receiving MCU or UART, then bit errors are likely to result in the link. However, jitter can be reduced for a given link through the use of receiver equalization. 11.2.2 Detailed Design Procedure 11.2.2.1 Noise Considerations for Equalized Receivers The simplest way of overcoming the effects of cable losses is to increase the sensitivity of the receiver. If the maximum attenuation of frequencies of interest is 20 dB, increasing the receiver gain by a factor of ten compensates for the cable. However, this means that signal and noise are amplified. Therefore, the receiver with Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 23 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 higher gain is more sensitive to noise and it is important to minimize differential noise coupling to the equalized receiver. Differential noise is crated when conducted or radiated noise energy generates more voltage on one line of the differential pair than the other. For this to occur from conducted or electric far-field noise, the impedance to ground of the lines must differ. For noise frequency out to 50 MHz, the input traces can be treated as a lumped capacitance if the receiver is approximately 10 inches or less from the connector. Therefore, matching impedance of the lines is accomplished by matching the lumped capacitance of each. The primary factors that affect the capacitance of a trace are in length, thickness, width, dielectric material, distance from the signal return path, stray capacitance, and proximity to other conductors. It is difficult to match each of the variables for each line of the differential pair exactly, but a reasonable effort to do so keeps the lines balanced and less susceptible to differential noise coupling. Another source of differential noise is from near-field coupling. In this situation, an assumption of equal noisesource impedance cannot be made as in the far-field. Familiarly known as crosstalk, more energy from a nearby signal is coupled to one line of the differential pair. Minimization of this differential noise is accomplished by keeping the signal pair close together and physical separation from high-voltage, high-current, or high-frequency signals. In summary, follow these guidelines in board layout for keeping differential noise to a minimum. • • • • • Keep the differential input traces short. Match the length, physical dimensions, and routing of each line of the pair. Keep the lines close together. Match components connected to each line. Separate the inputs from high-voltage, high-frequency, or high-current signals. 11.2.3 Application Curves Figure 11-2 illustrates the benefits of integrated receiver equalization as implemented in the SN65HVD23 transceiver. In this test setup, a differential signal generator applied a signal voltage at one end of the cable, which was Belden 3105A twisted-pair shielded cable. The test signal was a pseudo-random bit stream (PRBS) of nonreturn-to-zero (NRZ) data. Channel 1 (top) shows the eye-pattern of the differential voltage at the receiver inputs (after the cable attenuation). Channel 2 (bottom) shows the output of the receiver. Figure 11-3 illustrates the benefits of integrated receiver equalization as implemented in the SN65HVD24 transceiver. In this test setup, a differential signal generator applied a signal voltage at one end of the cable, which was Belden 3105A twisted-pair shielded cable. The test signal was a pseudo-random bit stream (PRBS) of nonreturn-to-zero (NRZ) data. Channel 1 (top) shows the eye-pattern of the bit stream. Channel 2 (middle) shows the eye-pattern of the differential voltage at the receiver inputs (after the cable attenuation). Channel 3 (bottom) shows the output of the receiver. 24 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 Figure 11-2. SN65HVD23 Receiver Performance at 25 Mbps Over 150 Meter Cable Figure 11-3. SN65HVD24 Receiver Performance at 5 Mbps Over 500 Meter Cable 12 Power Supply Recommendations To ensure reliable operation at all data rates and supply voltages, each supply must be decoupled with a 100-nF ceramic capacitor placed as close to the supply pins as possible. This helps to reduce supply voltage ripple present on the outputs of switched-mode power supplies and also helps to compensate for the resistance and inductance of the PCB power planes. Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 25 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 13 Layout 13.1 Layout Guidelines In addition to the guidelines on differential trace matching given in Section 11.2.2, the layout guidelines below must be followed: • • • Route power and ground nets as planes rather than traces, and keep their widths as large as possible to minimize resistance and inductance while maximizing parasitic capacitance. If external components (like transient voltage suppression diodes) are used for transient protection, place them close to the connector port and within the path of the signal lines. Make sure component capacitances are small enough not to impact the RS-485 signaling at the chosen data rate. Small-valued series pulse-proof resistances can be used to provide additional immunity to transients. This is needed to limit input currents if the clamping voltages of external transient protection devices exceed the absolute maximum ratings of the transceiver. These resistances must be less than 10 Ω so that the RS-485 signal is not overly attenuated. 13.2 Layout Example Via to ground Via to VCC C R R MCU JMP R R R R TVS SN65HVD2x Figure 13-1. SN65HVD2x Layout Example 26 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 SN65HVD20, SN65HVD21, SN65HVD22, SN65HVD23, SN65HVD24 www.ti.com SLLS552G – DECEMBER 2002 – REVISED SEPTEMBER 2022 14 Device and Documentation Support 14.1 Receiving Notification of Documentation Updates To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document. 14.2 Support Resources TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight from the experts. Search existing answers or ask your own question to get the quick design help you need. Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. 14.3 Trademarks TI E2E™ is a trademark of Texas Instruments. All trademarks are the property of their respective owners. 14.4 Electrostatic Discharge Caution This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 14.5 Glossary TI Glossary This glossary lists and explains terms, acronyms, and definitions. 15 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. Copyright © 2022 Texas Instruments Incorporated Submit Document Feedback Product Folder Links: SN65HVD20 SN65HVD21 SN65HVD22 SN65HVD23 SN65HVD24 27 PACKAGE OPTION ADDENDUM www.ti.com 30-Nov-2022 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) Samples (4/5) (6) SN65HVD20D NRND SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP20 SN65HVD20DR ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP20 Samples SN65HVD20P ACTIVE PDIP P 8 50 RoHS & Green NIPDAU N / A for Pkg Type -40 to 85 65HVD20 Samples SN65HVD21D NRND SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP21 SN65HVD21DR ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP21 Samples SN65HVD21P ACTIVE PDIP P 8 50 RoHS & Green NIPDAU N / A for Pkg Type -40 to 85 65HVD21 Samples SN65HVD22D NRND SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP22 SN65HVD22DR ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP22 Samples SN65HVD22DRG4 ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP22 Samples SN65HVD22P ACTIVE PDIP P 8 50 RoHS & Green NIPDAU N / A for Pkg Type -40 to 85 65HVD22 Samples SN65HVD23D NRND SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP23 SN65HVD23DR ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP23 Samples SN65HVD23P ACTIVE PDIP P 8 50 RoHS & Green NIPDAU N / A for Pkg Type -40 to 85 65HVD23 Samples SN65HVD24D NRND SOIC D 8 75 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP24 SN65HVD24DR ACTIVE SOIC D 8 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM -40 to 85 VP24 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 30-Nov-2022 Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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