SN75ALS174A QUADRUPLE DIFFERENTIAL LINE DRIVER SLLS122E – JULY 1991 – REVISED APRIL 1998 D D D D D D D D D D N PACKAGE (TOP VIEW) Meets or Exceeds the Requirements of ANSI EIA/TIA-422-B and RS-485 High-Speed Advanced Low-Power Schottky Circuitry Designed for up to 20-Mbit/s Operation in Both Serial and Parallel Applications Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments Low Supply Current Requirements 55 mA Max Wide Positive and Negative Input/Output Bus Voltage Ranges Driver Output Capacity . . . ±60 mA Thermal-Shutdown Protection Driver Positive- and Negative-Current Limiting Functionally Interchangeable With SN75174 1A 1Y 1Z 1,2EN 2Z 2Y 2A GND 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC 4A 4Y 4Z 3,4EN 3Z 3Y 3A DW PACKAGE (TOP VIEW) 1A 1Y NC 1Z 1,2EN 2Z NC 2Y 2A GND description The SN75ALS174A is a quadruple line driver with 3-state differential outputs. It is designed to meet the requirements of ANSI Standards EIA/TIA-422-B and RS-485. This device is optimized for balanced multipoint bus transmission at rates of up to 20 Mbit/s. Each driver features wide positive and negative common-mode output voltage ranges that make them suitable for party-line applications in noisy environments. 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 VCC 4A 4Y NC 4Z 3,4EN 3Z NC 3Y 3A NC – No internal connection The SN75ALS174A provides positive- and negative-current limiting and thermal shutdown for protection from line fault conditions on the transmission bus line. Shutdown occurs at a junction temperature of approximately 150°C. The SN75ALS174A is characterized for operation from 0°C to 70°C. FUNCTION TABLE (each driver) INPUT A ENABLES H H L X OUTPUTS Y Z H L H L H L Z 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. Copyright 1998, 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 SN75ALS174A QUADRUPLE DIFFERENTIAL LINE DRIVER SLLS122E – JULY 1991 – REVISED APRIL 1998 logic symbol† 1,2EN 4 EN 2 1A 1 3 6 2A 3,4EN 7 5 12 9 11 14 4A 15 13 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the N package. logic diagram (positive logic) 1,2EN 4 2 1A 2A 3,4EN 1 7 3 6 5 3A 4A 1Y 1Z 2Y 2Z 12 10 9 15 11 14 13 Pin numbers shown are for the N package. 2 1Z 2Y 2Z EN 10 3A 1Y POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3Y 3Z 4Y 4Z 3Y 3Z 4Y 4Z SN75ALS174A QUADRUPLE DIFFERENTIAL LINE DRIVER SLLS122E – JULY 1991 – REVISED APRIL 1998 schematics of inputs and outputs EQUIVALENT OF EACH INPUT TYPICAL OF ALL OUTPUTS VCC VCC 35 kΩ NOM Input Output GND absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Output voltage range, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –9 V to 14 V Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°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. NOTE 1: All voltage values are with respect to network GND. DISSIPATION RATING TABLE PACKAGE TA ≤ 25°C POWER RATING DERATING FACTOR TA = 70°C POWER RATING TA = 85°C POWER RATING DW 1125 mW 9.0 mW/°C 720 mW 585 mW N 1150 mW 9.2 mW/°C 736 mW 598 mW recommended operating conditions Supply voltage, VCC High-level input voltage, VIH MIN NOM MAX UNIT 4.75 5 5.25 V 2 V Low-level input voltage, VIL 0.8 V Common-mode output voltage, VOC 12 –7 V –60 mA 60 mA 70 °C High-level output current, IOH Low-level output current, IOL Operating free-air temperature, TA 0 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN75ALS174A QUADRUPLE DIFFERENTIAL LINE DRIVER SLLS122E – JULY 1991 – REVISED APRIL 1998 electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) PARAMETER TEST CONDITIONS VIK VO Input clamp voltage Output voltage II = –18 mA IO = 0 |VOD1| Differential output voltage IO = 0 |VOD2| RL = 100 Ω Differential output voltage g MIN See Figure g 1 MAX UNIT –1.5 V 0 6 V 1.5 6 V 1/2VOD1 or 2‡ RL = 54 Ω 1.5 1.5 |VOD3| Differential output voltage See Note 2 ∆|VOD| Change in magnitude of differential output voltage§ RL = 54 Ω or 100 Ω, VOC Common-mode output voltage¶ ∆|VOC| TYP† V 2.5 5 5 V See Figure 1 ±0.2 V RL = 54 Ω or 100 Ω, See Figure 1 3 –1 V Change in magnitude of common-mode output voltage§ RL = 54 Ω or 100 Ω, See Figure 1 ±0.2 V IO IOZ Output current with power off VCC = 0, VO = –7 V to 12 V VO = –7 V to 12 V ±100 µA ±100 µA IIH IIL High-level input current 20 µA Low-level input current VI = 2.7 V VI = 0.4 V –100 µA IOS Short-circuit output current VO = –7 V to 12 V ±250 mA ICC High-impedance-state output current Supply current (all drivers) No load Outputs enabled 36 55 Outputs disabled 16 30 mA † All typical values are at VCC = 5 V and TA = 25°C. ‡ The minimum VOD2 with a 100-Ω load is either 1/2 VOD1 or 2 V, whichever is greater. § ∆|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. ¶ In ANSI Standard EIA/TIA-422-B, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS. NOTE 2: See EIA Standard RS-485, Figure 3-5, Test Termination Measurement 2. switching characteristics over recommended ranges of supply voltage and operating free-air temperature, CL = 50 pF PARAMETER TEST CONDITIONS TYP† MAX UNIT td(OD) tPZH Differential output delay time RL = 54 Ω, See Figure 2 9 15 22 ns Output enable time to high level RL = 110 Ω, See Figure 3 30 45 70 ns tPZL tPHZ Output enable time to low level RL = 110 Ω, See Figure 4 25 40 65 ns Output disable time from high level RL = 110 Ω, See Figure 3 10 20 35 ns RL = 110 Ω, See Figure 4 10 30 45 ns tPLZ Output disable time from low level † All typical values are at VCC = 5 V and TA = 25°C. 4 MIN POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN75ALS174A QUADRUPLE DIFFERENTIAL LINE DRIVER SLLS122E – JULY 1991 – REVISED APRIL 1998 PARAMETER MEASUREMENT INFORMATION RL 2 VOD2 RL 2 VOC Figure 1. Differential and Common-Mode Output Voltages 3V Y CL Generator (see Note A) 50 Ω Input RL = 54 Ω 1.5 V td(ODH) Z 3V 1.5 V 0V td(ODL) Output Z CL = 50 pF (see Note B) Output Y TEST CIRCUIT VOLTAGE WAVEFORMS NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, ZO = 50 Ω, duty cycle = 50%, tf ≤ 5 ns, tr ≤ 5 ns. B. CL includes probe and stray capacitance. Figure 2. Differential-Output Test Circuit and Delay and Transition Times Voltage Waveforms 3V Output S1 0 V or 3 V Generator (see Note A) Input CL = 50 pF (see Note B) 50 Ω 1.5 V 1.5 V 0V RL = 110 Ω Output tPZH 0.5 V VOH 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, ZO = 50 Ω, duty cycle = 50%, tf ≤ 5 ns, tr ≤ 5 ns. B. CL includes probe and stray capacitance. Figure 3. Test Circuit and Voltage Waveforms, tPZH and tPHZ POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 SN75ALS174A QUADRUPLE DIFFERENTIAL LINE DRIVER SLLS122E – JULY 1991 – REVISED APRIL 1998 PARAMETER MEASUREMENT INFORMATION 5V RL = 110 Ω S1 0 V or 3 V Generator (see Note A) Output 3V Input 1.5 V 1.5 V 0V tPZL CL = 50 pF (see Note B) 50 Ω 2.3 V Output tPLZ 5V VOL 0.5 V TEST CIRCUIT VOLTAGE WAVEFORMS NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, ZO = 50 Ω, duty cycle = 50%, tf ≤ 5 ns, tr ≤ 5 ns. B. CL includes probe and stray capacitance. Figure 4. Test Circuit and Voltage Waveforms, tPZL and tPLZ 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 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. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. 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