Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsInterface ICsInterface IC - transceivers RS485 1/1 SOIC 8

-20 V +25 V

-7V +12 V

SUPER485

RS485

-20V -15V -10V -5V 0 5V 10V 15V 20V 25V

SN65HVD21A

www.ti.com

SLLSE36 –DECEMBER 2010

6 Mbps, Extended Common-Mode RS-485 Transceiver

Check for Samples: SN65HVD21A

FEATURES

DESCRIPTION

• Common-Mode Voltage Range (–20 V to 25 V)

More Than Doubles TIA/EIA-485 Requirement

The SN65HVD21A offers performance far exceeding

typical RS−485 devices. In addition to meeting all

• Reduced Unit-Load for up to 256 Nodes

requirements of the TIA/EIA−485−A standard, the

• Bus I/O Protection to Over 16-kV HBM

device operates over an extended range of

• Failsafe Receiver for Open-Circuit,

common-mode voltage, and has features such as

Short-Circuit and Idle-Bus Conditions

high ESD protection, wide receiver hysteresis, and

failsafe operation. This device is ideally suited for

• Low Standby Supply Current 1-µA Max

long-cable networks, and other applications where

• More Than 100 mV Receiver Hysteresis

the environment is too harsh for ordinary

transceivers.

APPLICATIONS

The device is designed for bidirectional data

• Long Cable Solutions

transmission on multipoint twisted-pair cables.

– Factory Automation

Example applications are digital motor controllers,

– Security Networks

remote sensors and terminals, industrial process

– Building HVAC

control, security stations, and environmental control

systems.

• Severe Electrical Environments

– Electrical Power Inverters

The device combines a 3-state differential driver and

a differential receiver, which operate from a single

– Industrial Drives

5-V power supply. The driver differential outputs and

– Avionics

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.

Device Operates Over a Wider Common-Mode Voltage Range

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (22 pages)

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SN65HVD21A www.ti.
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SN65HVD21A SLLSE36 – DECEMBER 2010 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. DESCRIPTION (CONTINUED) The SN65HVD21A allows up to 256 connected nodes at moderate data rates (up to 6 Mbps). The driver output slew rate is controlled to provide reliable switching with shaped transitions which reduce high-frequency noise emissions.
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SN65HVD21A www.ti.com SLLSE36 – DECEMBER 2010 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) SN65HVD2X Supply voltage (2), VCC –0.5 V to 7 V Voltage at any bus I/O terminal –27 V to 27 V Voltage input, transient pulse, A and B, (through 100 Ω, see Figure 16) –60 V to 60 V Voltage input at any D, DE or RE terminal –0.5 V to VCC+ 0.
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SN65HVD21A SLLSE36 – DECEMBER 2010 www.ti.com DRIVER ELECTRICAL CHARACTERISTICS over recommended operating conditions PARAMETER VIK 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) –1.5 0.75 TEST CONDITIONS 0 MAX V VCC No load (open circuit) 3.3 4.2 RL = 54 Ω, See Figure 1 1.8 2.5 With common-mode loading, See Figure 2 1.
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SN65HVD21A www.ti.com SLLSE36 – DECEMBER 2010 RECEIVER ELECTRICAL CHARACTERISTICS over recommended operating conditions PARAMETER TEST CONDITIONS VIT(+) Positive-going differential input voltage threshold VIT(–) Negative-going differential input voltage threshold VHYS Hysteresis voltage (VIT+ – VIT–) See Figure 10 TYP (1) MAX 60 200 VO = 2.4 V, IO = –8 mA VO = 0.
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SN65HVD21A SLLSE36 – DECEMBER 2010 www.ti.
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SN65HVD21A www.ti.com SLLSE36 – DECEMBER 2010 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 1.
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SN65HVD21A SLLSE36 – DECEMBER 2010 www.ti.com PARAMETER MEASUREMENT INFORMATION (continued) VOD(SS) VOD(RING) VOD(PP) 0 V Differential VOD(RING) VOD(SS) NOTE: 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 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 DE CL = 50 pF 1.5 V 1.5 V 0.
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SN65HVD21A www.ti.com SLLSE36 – DECEMBER 2010 PARAMETER MEASUREMENT INFORMATION (continued) 3V DE 1.5 V 0V A D 0 V or 3 V CL = 50 pF RL = 54 Ω VOD B 1.5 V V OD DE Signal Generator td(Wake) td(Standby) 0.2 V 50 Ω Figure 8. Driver Standby/Wake Test Circuit and Waveforms IOS VO Voltage Source Figure 9. Driver Short-Circuit Test IO VID VO Figure 10. Receiver DC Parameter Definitions Signal Generator 50 Ω Input B VID A B Signal Generator 50 Ω R CL = 15 pF IO VO 1.
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SN65HVD21A SLLSE36 – DECEMBER 2010 www.ti.com PARAMETER MEASUREMENT INFORMATION (continued) D VCC VCC DE A 54 Ω B R 3V RE 0V 1.5 V 0V CL = 15 pF RE Signal Generator 1 kΩ tPZH tPHZ VOH VOH 0.5 V 50 Ω 1.5 V R GND Figure 12. Receiver Enable Test Circuit and Waveforms, Data Output High 0V VCC D DE A 54 Ω B R 3V RE 5V 1.5 V 0V CL = 15 pF RE Signal Generator 1 kΩ tPZL tPLZ VCC 50 Ω 1.5 V R VOL +0.5 V VOL Figure 13.
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SN65HVD21A www.ti.com SLLSE36 – DECEMBER 2010 PARAMETER MEASUREMENT INFORMATION (continued) Bus Data Valid Region 200 mV Bus Data Transition Region 40 mV VID 200 mV 1.5 V Bus Data Valid Region tp(SET) tp(RESET) VOH R 1.5 V VOL Figure 15. Receiver Active Failsafe Definitions and Waveforms VTEST 100 Ω 0V Pulse Generator, 15 ms Duration, 1% Duty Cycle 1.5 ms 15 ms V TEST Figure 16.
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SN65HVD21A SLLSE36 – DECEMBER 2010 www.ti.com THERMAL INFORMATION SN65HVD21A THERMAL METRIC (1) SOIC (D) UNITS 8 PINS qJA Junction-to-ambient thermal resistance qJCtop Junction-to-case (top) thermal resistance 56.5 qJB Junction-to-board thermal resistance 50.44 yJT Junction-to-top characterization parameter 4.1 yJB Junction-to-board characterization parameter 32.6 qJCbot Junction-to-case (bottom) thermal resistance n/a (1) 78.
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SN65HVD21A www.ti.com SLLSE36 – DECEMBER 2010 TYPICAL CHARACTERISTICS BUS PIN CURRENT vs BUS PIN VOLTAGE SUPPLY CURRENT vs SIGNALING RATE 75 150 VCC = 5 V, DE = RE = VCC, LOAD = 54 Ω, 50 pF DE = 0 V 70 ICC - Supply Current - mA Bus Pin Current - m A 100 50 VCC = 0 V 0 VCC = 5 V 50 100 150 -30 65 60 55 50 45 -20 0 -10 20 10 40 0.1 30 10 1 Signaling Rate - Mbps Bus Pin Voltage - V Figure 17. Figure 18.
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SN65HVD21A SLLSE36 – DECEMBER 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) PEAK-TO-PEAK JITTER vs CABLE LENGTH PEAK-TO-PEAK JITTER vs SIGNALING RATE 130 70 110 Peak-to-Peak Jitter - ns Peak-to-Peak Jitter - ns 60 HVD21: 500 m Cable VCC = 5 V, TA = 25°C, VIC = 2.5 V, Cable: Belden 3105A 50 40 10 Mbps 30 20 70 50 HVD24: 500 m Cable 220 240 260 Cable Length - m 280 300 10 3 Figure 21. 14 VCC = 5 V, TA = 25°C, VIC = 2.5 V, Cable: Belden 3105A 30 10 0 200 90 3.5 4 4.
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SN65HVD21A www.ti.com SLLSE36 – DECEMBER 2010 APPLICATION INFORMATION THEORY OF OPERATION The SN65HVD21A 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.
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SN65HVD21A SLLSE36 – DECEMBER 2010 www.ti.com Figure 24. 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.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device SN65HVD21ADR Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.4 B0 (mm) K0 (mm) P1 (mm) 5.2 2.1 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) SN65HVD21ADR SOIC D 8 2500 340.5 338.1 20.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.