SN55LBC174 QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER SGLS082 – MARCH 1995 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC 4A 4Y 4Z 3, 4EN 3Z 3Y 3A 3 2 1 20 19 3Z 4 18 4Y 1, 2EN 5 17 4Z NC 6 16 NC 2Z 7 15 3, 4EN 2Y 8 14 3Z 3Y 10 11 12 13 3A 9 NC The SN55LBC174 is composed of monolithic quadruple differential line drivers with 3-state outputs. This device is designed to meet the requirements of the Electronics Industry Association (EIA) Standard RS-485 and is optimized for balanced multipoint bus transmission at data rates up to and exceeding 10 million bits per second. Each driver features wide positive and negative common-mode output voltage ranges, current limiting, and thermal-shutdown protection making it suitable for party-line applications in noisy environments. This device is designed using LinBiCMOS, facilitating ultra-low power consumption and inherent robustness. VCC 4A description NC FK PACKAGE (TOP VIEW) 1A D D 1 GND D 1A 1Y 1Z 1, 2EN 2Z 2Y 2A GND 1Y D J OR W PACKAGE (TOP VIEW) Meets EIA Standard RS-485 Designed for High-Speed Multipoint Transmission on Long Bus Lines in Noisy Environments Supports Data Rates up to and Exceeding Ten Million Transfers Per Second Common-Mode Output Voltage Range of – 7 V to 12 V Positive- and Negative-Current Limiting Low Power Consumption . . . 1.5 mA Max (Output Disabled) 2A D D NC – No internal connection The SN55LBC174 provides positive and negative-current limiting and thermal shutdown for protection from line fault conditions on the transmission bus line. This device offers optimum performance when used with the SN55LBC173 quadruple line receiver. The SN55LBC174 is available in the 16-pin CDIP package (J), the 16-pin CPAK (W), or the 20-pin LCCC package (FK). The SN55LBC174 is characterized for operation over the military temperature range of – 55°C to 125°C. FUNCTION TABLE (each driver) OUTPUTS INPUT ENABLE H H H L L H L H X L Z Z Y Z H = high level, L = low level, X = irrelevant, Z = high impedance (off) 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. LinBiCMOS is a trademark of Texas Instruments Incorporated. Copyright 1995, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SN55LBC174 QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER SGLS082 – MARCH 1995 logic symbol† 1, 2EN 4 logic diagram (positive logic) EN 1A 1A 2A 3, 4EN 3A 4A 2 1 3 6 7 12 5 1Y 1, 2EN 2Y 2A 11 14 15 13 3Y 3, 4EN 6 7 5 10 9 11 1Z 2Y 2Z 3Y 3Z 12 3Z 14 15 4Y 1Y 4 2Z 3A 9 3 1Z EN 10 2 1 4A 13 4Z 4Y 4Z † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the J or W package. schematic of inputs and outputs ALL INPUTS Y OR Z OUTPUT VCC VCC 50 µA 200 Ω Output Input Driver 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN55LBC174 QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER SGLS082 – MARCH 1995 absolute maximum ratings over operating free-air temperature (unless otherwise noted)† Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 7 V Output voltage range, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 10 V to 15 V Input voltage range, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 7 V Continuous power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . internally limited‡ Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. ‡ The maximum operating junction temperature is internally limited. Use the dissipation rating table to operate below this temperature. NOTE 1: All voltage values are with respect to GND. DISSIPATION RATING TABLE PACKAGE TA ≤ 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C TA = 125°C POWER RATING FK 1375 mW 11.0 mW/°C 275 mW J 1375 mW 11.0 mW/°C 275 mW W 1000 mW 8.0 mW/°C 200 mW recommended operating conditions Supply voltage, VCC High-level input voltage, VIH MIN NOM MAX UNIT 4.75 5 5.25 V 2 Low-level input voltage, VIL V 0.8 Voltage at any bus terminal (separately or common mode), mode) VO Y or Z High-level output current, IOH Y or Z Low-level output current, IOL Y or Z Operating free-air temperature, TA 12 –7 – 55 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 V V – 60 mA 60 mA 125 °C 3 SN55LBC174 QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER SGLS082 – MARCH 1995 electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER TEST CONDITIONS VIK Input clamp voltage |VOD| Differential output voltage‡ ∆|VOD| Change in magnitude of differential output voltage§ VOC Common mode output voltage Common-mode ∆|VOC| Change in magnitude of common-mode output voltage§ IO IOZ Output current with power off IIH IIL High-level input current IOS Short-circuit output current ICC Supply current (all drivers) Low-level input current TYP† MAX UNIT – 1.5 V II = – 18 mA RL = 54 Ω, See Figure 1 1.1 1.8 5 RL = 60 Ω, See Figure 2 1.1 1.7 5 V ± 0.2 V 3 –1 V ± 0.2 V VCC = 0, VO = – 7 V to 12 V VO = – 7 V to 12 V ± 100 µA ± 100 µA VI = 2.4 V VI = 0.4 V – 100 µA – 100 µA VO = – 7 V to 12 V Outputs enabled No load Outputs disabled ± 250 mA RL = 54 Ω Ω, High-impedance-state output current MIN See Figure 1 7 1.5 mA † All typical values are at VCC = 5 V and TA = 25°C. ‡ The minimum VOD specification does not fully comply with EIA Standard RS-485 at operating temperatures below 0°C. The lower output signal should be used to determine the maximum signal transmission distance. § ∆|VOD| and ∆|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low level. switching characteristics, VCC = 5 V PARAMETER TEST CONDITIONS td(OD) Differential output delay time RL = 54 Ω Ω, See Figure 3 tt(OD) Differential output transition time RL = 54 Ω Ω, See Figure 3 tPZH Output enable time to high level RL = 110 Ω Ω, See Figure 4 tPZL Output enable time to low level RL = 110 Ω Ω, See Figure 5 tPHZ Output disable time from high level RL = 110 Ω Ω, See Figure 4 tPLZ Output Out ut disable time from low level RL = 110 Ω Ω, See Figure 5 4 POST OFFICE BOX 655303 TA 25°C MIN TYP MAX 2 11 20 – 55°C to 125°C 2 25°C 4 – 55°C to 125°C 4 40 15 25 40 25°C 30 – 55°C to 125°C 40 25°C 30 – 55°C to 125°C 40 25°C 50 – 55°C to 125°C 90 25°C 30 – 55°C to 125°C 45 • DALLAS, TEXAS 75265 UNIT ns ns ns ns ns ns SN55LBC174 QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER SGLS082 – MARCH 1995 PARAMETER MEASUREMENT INFORMATION RL 2 VOD2 RL 2 VOC Figure 1. Differential and Common-Mode Output Voltages Vtest R1 = 375 Ω Y 0 V or 3 V A RL = 60 Ω VOD Z R2 = 375 Ω EN at 5 V Vtest – 7 V < Vtest < 12 V Figure 2. Driver VOD Test Circuit 3V Input Input Generator (see Note A) RL = 54 Ω CL = 50 pF (see Note B) 50 Ω 1.5 V 1.5 V 0V Output td(OD) td(OD) Output 50% 90% ≈ 2.5 V 50% 10% tt(OD) 3V TEST CIRCUIT ≈ – 2.5 V tt(OD) VOLTAGE WAVEFORMS NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, duty cycle ≤ 50%, tr ≤ 5 ns, tf ≤ 5 ns, ZO = 50 Ω. B. CL includes probe and stray capacitance. Figure 3. Driver Differential-Output Test Circuit Delay and Transition-Time Waveforms POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 SN55LBC174 QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER SGLS082 – MARCH 1995 PARAMETER MEASUREMENT INFORMATION 3V Input S1 1.5 V Output 3 V or 0 V 1.5 V 0V Input Generator (see Note A) 50 Ω RL = 110 Ω CL = 50 pF (see Note B) 0.5 V tPZH VOH Output 2.3 V Voff ≈ 0 V tPHZ TEST CIRCUIT VOLTAGE WAVEFORMS NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, duty cycle ≤ 50%, tr ≤ 5 ns, tf ≤ 5 ns, ZO = 50 Ω. B. CL includes probe and stray capacitance. Figure 4. tPZH and tPHZ Test Circuit and Waveforms 5V RL = 110 Ω S1 Output 3V Input 0 V or 3 V 1.5 V 0V tPZL CL = 50 pF (see Note B) Input Generator (see Note A) 1.5 V 50 Ω tPLZ 2.3 V Output TEST CIRCUIT 5V 0.5 V VOL VOLTAGE WAVEFORMS NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, duty cycle ≤ 50%, tr ≤ 5 ns, tf ≤ 5 ns, ZO = 50 Ω. B. CL includes probe and stray capacitance. Figure 5. tPZL and tPLZ Test Circuit and Waveforms 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN55LBC174 QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER SGLS082 – MARCH 1995 TYPICAL CHARACTERISTICS LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT OUTPUT CURRENT vs OUTPUT VOLTAGE 5 50 Output Disabled TA = 25°C 4.5 VOL – Low-Level Output Voltage – V 40 IIO O – Output Current – µA 30 ÁÁ ÁÁ 20 10 0 – 10 VCC = 0 – 20 – 30 VCC = 5 V 4 3.5 3 2.5 2 1.5 1 0.5 – 40 – 50 – 25 – 20 – 15 – 10 – 5 VCC = 5 V TA = 25°C 0 5 10 15 20 0 – 20 25 VO – Output Voltage – V 20 40 100 60 80 0 IOL – Low-Level Output Current – mA Figure 7 Figure 6 DIFFERENTIAL OUTPUT VOLTAGE vs FREE-AIR TEMPERATURE HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT 5 RL = 54 Ω VCC = 5 V VOH – High-Level Output Voltage – V VOD– Differential Output Voltage – V 3 ÁÁ ÁÁ 2.5 2 1.5 1 0.5 0 – 60 120 VCC = 5 V TA = 25°C 4.5 4 3.5 3 2.5 2 1.5 – 40 – 20 0 20 40 60 80 100 TA – Free-Air Temperature – °C 20 0 – 20 – 40 – 60 – 80 – 100 – 120 IOH – High-Level Output Current – mA Figure 8 Figure 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 SN55LBC174 QUADRUPLE LOW-POWER DIFFERENTIAL LINE DRIVER SGLS082 – MARCH 1995 TYPICAL CHARACTERISTICS PROPAGATION DELAY TIME, DIFFERENTIAL OUTPUT vs FREE-AIR TEMPERATURE DIFFERENTIAL OUTPUT VOLTAGE vs OUTPUT CURRENT Propagation Delay Time, Differential Output – ns V OD – Differential Output Voltage – V 3 VCC = 5 V TA = 25°C 2.5 2 1.5 1 0.5 0 0 10 20 30 40 50 60 70 80 90 100 14 RL = 54 Ω CL = 50 pF VCC = 5 V 13 12 11 10 9 8 7 6 5 4 – 60 – 40 – 20 Figure 10 8 0 20 Figure 11 POST OFFICE BOX 655303 40 60 TA – Free-Air Temperature – °C IO – Output Current – mA • DALLAS, TEXAS 75265 80 100 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. 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