SN78 Meets or Exceeds the Requirements of ANSI EIA/TIA--B and ITU Recommendation V. Single -V Supply Balanced-Line Operation TTL Compatible High Output Impedance in Power-Off Condition High-Current Active-Pullup Outputs Short-Circuit Protection Dual Channels Input Clamp Diodes SLLS8B JANUARY 977 REVISED MAY 99 D, P, OR PS PACKAGE (TOP VIEW) Z Y A GND 8 7 V CC Z Y A The PS package is only available left-end taped and reeled, i.e., order SN78PSLE. description The SN78 is a dual differential line driver designed to satisfy the requirements set by the ANSI EIA/TIA--B and ITU V. interface specifications. The outputs provide complementary signals with high-current capability for driving balanced lines, such as twisted pair, at normal line impedance without high power dissipation. The output stages are TTL totem-pole outputs providing a high-impedance state in the power-off condition. The SN78 is characterized for operation from C to 7 C. logic symbol A A Y Z Y 7 Z logic diagram (positive logic) Y A Z Y A 7 Z This symbol is in accordance with ANSI/IEEE Std 9-98 and IEC Publication 7-. 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 Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 99, Texas Instruments Incorporated POST OFFICE BOX DALLAS, TEXAS 7
SN78 SLLS8B JANUARY 977 REVISED MAY 99 schematics of inputs and outputs VCC EQUIVALENT OF EACH INPUT TYPICAL OF ALL OUTPUTS VCC kω NOM Input 9 Ω NOM GND Output GND absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, V CC (see Note )............................................................. 7 V Input voltage, V I........................................................................... V Continuous total power dissipation..................................... See Dissipation Rating Table Operating free-air temperature range, T A.............................................. C to 7 C Storage temperature range, T stg................................................... C to C Lead temperature, mm (/ inch) from case for seconds............................... 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 : All voltage values, except differential output voltage VOD, are with respect to network ground terminal. VOD is at the Y output with respect to the Z output. PACKAGE DISSIPATION RATING TABLE TA A C DERATING FACTOR TA A = 7 C POWER RATING ABOVE TA = C POWER RATING D 7 mw.8 mw/ C mw P mw 8. mw/ C mw PS mw. mw/ C 88 mw recommended operating conditions MIN NOM MAX UNIT Supply voltage, VCC.7. V High-level input voltage, VIH V Low-level input voltage, VIL.8 V High-level output current, IOH ma Low-level output current, IOL ma Operating free-air temperature, TA 7 C POST OFFICE BOX DALLAS, TEXAS 7
SN78 SLLS8B JANUARY 977 REVISED MAY 99 electrical characteristics over operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VIK Input clamp voltage VCC = MIN, II = ma.9. V VCC = MIN, VIL =.8 V, VOH High-level output voltage VIH = V, IOH = ma VCC = MIN, VIL =.8 V, VOL Low-level output voltage VIH = V, IOL = ma. V.. V VOD Differential output voltage VCC = MAX, IO =. VOD V VOD Differential output voltage VCC = MIN V VOD Change in magnitude of differential output voltage VCC = MIN ±. ±. V VOC VOC Common-mode mode output voltage Change in magnitude of common-mode output voltage VCC = MAX RL = Ω,.8 VCC = MIN See Figure. VCC = MIN or MAX V ± ±. ± ±. V VO = V. IO Output current with power off VCC = VO =. V. µa VO =. to V ± II Input current at maximum input voltage VCC = MAX, VI =. V ma IIH High-level input current VCC = MAX, VI =. V µa IIL Low-level input current VCC = MAX, VI =. V. ma IOS Short-circuit output current # VCC = MAX 9 ma ICC Supply current (both drivers) VCC = MAX, TA = C, Inputs grounded, No load 7 ma For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. All typical values are at VCC = V and TA = C except for VOC, for which VCC is as stated under test conditions. VOD and VOC are the changes in magnitudes 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--B, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS. # Only one output should be shorted at a time, and duration of the short circuit should not exceed one second. switching characteristics, V CC = V, T A = C tplh tphl tplh tphl ttlh ttlh PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Propagation delay time, low-to-high-level output ns See Figure, Termination A Propagation delay time, high-to-low-level output ns Propagation delay time, low-to-high-level output ns See Figure, Termination B Propagation delay time, high-to-low-level output 9 ns Transition time, low-to-high-level output ns See Figure, Termination A Transition time, high-to-low-level output ns Overshoot factor See Figure, Termination C % POST OFFICE BOX DALLAS, TEXAS 7
SN78 SLLS8B JANUARY 977 REVISED MAY 99 PARAMETER MEASUREMENT INFORMATION VOD Ω Ω VOC Figure. Differential and Common-Mode Output Voltages Input Pulse Generator (see Note A) Y Output Z Output Y Z Y Y CL = pf Ω (see Note B) CL = pf Z (see Note B) CL = pf Ω (see Note B) Z TERMINATION A TERMINATION B TEST CIRCUITS TERMINATION C ns ns Input % 9% % 9% % % V V Overshoot % tplh tphl Differential Output % % 9% 9% % % % t TLH t THL VOLTAGE WAVEFORMS Overshoot NOTES: A. The pulse generator has the following characteristics: ZO = Ω, tw = ns, PRR MHz. B. CL includes probe and jig capacitance. Figure. Test Circuit and Voltage Waveforms POST OFFICE BOX DALLAS, TEXAS 7
SN78 TYPICAL CHARACTERISTICS SLLS8B JANUARY 977 REVISED MAY 99 No Load TA = C OUTPUT VOLTAGE DATA INPUT VOLTAGE VCC = V No Load OUTPUT VOLTAGE DATA INPUT VOLTAGE VO V O Output Voltage V VCC =. V VCC = V VCC =. V VO V O Output Voltage V TA = C TA = C TA = C VI Data Input Voltage V VI Data Input Voltage V Figure Figure HIGH-LEVEL OUTPUT VOLTAGE HIGH-LEVEL OUTPUT CURRENT LOW-LEVEL OUTPUT VOLTAGE LOW-LEVEL OUTPUT CURRENT TA = C. TA = C VOH V OH High-Level Output Voltage V VCC =. V VCC =. V VCC = V VOL V Low-Level Output Voltage V... VCC =. V VCC =. V 8 IOH High-Level Output Current ma 7 IOL Low-Level Output Current ma 8 Figure Figure POST OFFICE BOX DALLAS, TEXAS 7
SN78 SLLS8B JANUARY 977 REVISED MAY 99 TYPICAL CHARACTERISTICS V VO O Output Voltage V... OUTPUT VOLTAGE FREE-AIR TEMPERATURE VCC = V. VOH(IOH = ma) VOL(IOL = ma) VOH(IOH = ma) tpd Propagation Delay Times ns PROPAGATION DELAY TIMES FREE-AIR TEMPERATURE VCC = V See Figure Termination A tplh tphl 7 7 TA Free-Air Temperature C Figure 7 7 7 TA Free-Air Temperature C Figure 8 8 7 No Load TA = C SUPPLY CURRENT (BOTH DRIVERS) SUPPLY VOLTAGE VCC = V Input Grounded Outputs Open SUPPLY CURRENT (BOTH DRIVERS) FREE-AIR TEMPERATURE ICC Supply Current ma Inputs Grounded Inputs Open ICC Supply Current ma 8 7 VCC Supply Voltage V 8 7 7 TA Free-Air Temperature C Figure 9 Figure POST OFFICE BOX DALLAS, TEXAS 7
SN78 TYPICAL CHARACTERISTICS SLLS8B JANUARY 977 REVISED MAY 99 ICC Supply Current ma 8 SUPPLY CURRENT (BOTH DRIVERS) FREQUENCY VCC = V RL = CL = pf Inputs: -V Square Wave TA = C.. f Frequency MHz Figure POST OFFICE BOX DALLAS, TEXAS 7 7
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