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| HD26LS32A Quadruple Differential Line Receivers With 3 State Outputs The HD26LS32A features quadruple line receivers designed to meet the specs of EIA standard RS422A and RS-423. This device operates from a single 5 V power supply. The enable function is common to all four receivers and offers a choice of active high or active low input. Fail safe design ensures that if the inputs are open, the outputs will always be high. Pin Arrangement 1B 1A 1Y 1 2 3 16 VCC 15 4B 14 4A 13 4Y 12 Enable G 11 3Y 10 3A 9 3B Enable 4 G 2Y 2A 5 6 7 8 Logic Diagram 1A 1B 2A 2B 3A 3B 4A 4B Enable G Enable G 1Y 2B GND (Top View) 2Y Function Table 3Y Differential Input A-B VID VTH 4Y VTL < VID < VTH Enable G H X H X VID VTL H X X H L X ? Z : : : : : L High level Low level Immaterial Irrelevant High impedance G X L X L X L H Output Y H H ? ? L L Z HD26LS32A Absolute Maximum Ratings Item Supply Voltage Input Voltage A or B Differential Input Voltage Enable Input Voltage Output Sink Current Continuous Total Dissipation Operating Temperature Storage Temperature Symbol VCC VIN VID VIN Iout PT Topr Tstg *2 *1 HD26LS32A Ratings 7.0 25 25 7 50 1 0 to +70 - 65 to 150 Unit V V V V mA W C C Notes: 1. All voltage values except for differential input voltage are with respect to network ground terminal. 2. Differential input voltage is measured at the noninverting input with respect to the corresponding inverting input. 3. The absolute maximum ratings are values which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. Recommended Operating Conditions Item Supply Voltage In Phase Input Voltage Output Current Operating Temperature Symbol VCC VIC IOH IOL Topr 0 Min 4.75 Typ 5.00 Max 5.25 7.0 - 440 8 70 Unit V V A mA C 2 HD26LS32A Electrical Characteristics (Ta = 0 to +70C) Item Differential Input High Threshold Voltage Differential Input Low Threshold Voltage Input Hysteresis *2 HD26LS32A Symbol VTH Conditions VIC = -7 to +7 V Min Typ *1 Max 0.2 Unit V VOH = 2.7V, IOH = -440A VOL = 0.4 V, IOL = 4 mA VOL = 0.45 V, IOL = 8 mA VTL -0.2 -0.2 50 2.0 0.8 mV V VTH-VTL VIH VIL Enable Input Voltage Enable Input Clamp Voltage Output Voltage VIK VCC = 4.75 V, IIN = -18 mA -1.5 VOH VOL VCC = 4.75V, VID = 1V, IOH = -440A 2.7 VIL (G) VID = -1 V, IOL = 4 mA = 0.8V VID = -1 V, IOL = 8 mA VCC = 5.25V VO = 2.4 V VO = 0.4 V VI = 15 V, Other Inputs-10 to +15 V VI = -15 V, Other Inputs-15 to +10 V VI = 5.5 V VI = 2.7 V VI = 0.4 V VIC = -15 to +15 V(Other Inputs AC GND) 6 VCC = 5.25 V -15 9.8 0.4 0.45 20 -20 2.3 -2.8 100 20 -0.36 mA K -85 mA A mA A Off State(High Impedance) IOZ Output Current Line Input Current II II (EN) IIH IIL Input Resistance Short Circuit Output Current Supply Current ri IOS *3 ICC Enable Input Current VCC = 5.25V, VI = 0V(All Outputs Disable) 52 70 Notes: 1. All typical values are at VCC=5V, Ta=25C,VIC=0. 2. Hysteresis is the differential between the positive going input threshold voltage and the negative going input threshold voltage. 3. Not more than one output should be shorted at a time. 3 HD26LS32A Switching Characteristics (VCC = 5 V, Ta = 25C) Item Propagation Delay Time Symbol tPLH tPHL Output Enable Time tZH tZL Output Disable Time tHZ tLZ CL = 5 pF CL = 15 pF Conditions CL = 15 pF Min Typ 20 22 17 20 21 30 HD26LS32A Max 35 35 22 25 30 40 Unit ns ns ns 1. tPLH, tPHL Test circuit VCC 2.5 V Input Pulse Generator CL Input B 5 K tPLH 2V Output 1.3 V tPHL VOH 1.3 V VOL Output 2 K 0V 0V -2.5 V Input A 0V 0V -2.5 V 2.5 V Waveforms 4 HD26LS32A 2. tHZ, tZH Test circuit VCC Output 2 K HD26LS32A Waveforms 3V S1 2.5 V CL Input Pulse Generator 2V Output tZH S1:Open S1:Closed 1.3 V tHZ Enable G 1.3 V 1.3 V 0V 5 K 3V Enable G 1.3 V 1.3 V 0V 0.5 V 1.4 V 0V 3. tLZ, tZL Test circuit VCC Output 2 K Enable G -2.5 V CL Input Pulse Generator 2V 1.3 V 1.3 V 0V 5 K 3V Enable G 1.3 V 1.3 V 0V S2 1.4 V Output 1.3 V VOL 0.5 V tZL S2:Open Notes: 1. The pulse generator has the following characteristics : PRR=1 MHZ, 50 % duty cycle, tr 6ns, tf 6ns, Zout=50 . 2. CL includes probe and jig capacitance. 3. All diodes are 1S2074 H 4. To test G input,ground G input and apply an inverted input waveform. tLZ S2:Closed 3V Waveforms 5 |
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