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 1 16 VCC 1A 2 15 4B 1Y 3 14 4A Enable 4 G 13 4Y 2Y 5 12 Enable G 2A 6 11 3Y 2B 7 10 3A GND 8 Logic Diagram 1A 1B 9 3B 1Y (Top View) 2A 2B 3A 3B 4A 4B 2Y Function Table 3Y Enable Differential Input A – B G G Output Y VID ≥ VTH H X H X L H H X ? X L ? H X L X L L L H Z 4Y VTL < VID < VTH Enable G Enable G VID ≤ VTL X H L X ? Z : : : : : High level Low level Immaterial Irrelevant High impedance HD26LS32A HD26LS32A Absolute Maximum Ratings Item Symbol Supply Voltage VCC *1 Ratings Unit 7.0 V ±25 V Input Voltage A or B VIN Differential Input Voltage VID Enable Input Voltage VIN ±25 7 V Output Sink Current Iout 50 mA Continuous Total Dissipation PT 1 W Operating Temperature Topr 0 to +70 °C Storage Temperature Tstg – 65 to 150 °C *2 V 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 Symbol Min Typ Max Unit Supply Voltage VCC 4.75 5.00 5.25 V In Phase Input Voltage VIC ±7.0 Output Current IOH – 440 V µA 8 mA 70 °C IOL Operating Temperature 2 Topr 0 HD26LS32A HD26LS32A Electrical Characteristics (Ta = 0 to +70°C) Symbol Item Differential Input High Threshold Voltage VTH Differential Input Low Threshold Voltage VTL Input Hysteresis *2 Enable Input Voltage VIC = –7 to +7 V Unit VOH = 2.7V, IOH = –440µA 0.2 V VOL = 0.4 V, IOL = 4 mA –0.2 VOL = 0.45 V, IOL = 8 mA –0.2 VTH–VTL Typ *1 Max Min Conditions mV 50 VIH V 2.0 0.8 VIL Enable Input Clamp Voltage VIK VCC = 4.75 V, IIN = –18 mA –1.5 Output Voltage VOH VCC = 4.75V, VID = 1V, IOH = –440µA 2.7 VIL (G) VID = –1 V, IOL = 4 mA = 0.8V VID = –1 V, IOL = 8 mA 0.4 VOL 0.45 VO = 2.4 V 20 VO = 0.4 V –20 µA Off State(High Impedance) IOZ Output Current VCC = 5.25V Line Input Current VI = 15 V, Other Inputs–10 to +15 V 2.3 VI = –15 V, Other Inputs–15 to +10 V –2.8 II (EN) VI = 5.5 V 100 IIH VI = 2.7 V 20 IIL VI = 0.4 V –0.36 mA Enable Input Current Input Resistance II ri Short Circuit Output Current IOS Supply Current ICC VIC = –15 to +15 V(Other Inputs AC GND) 6 *3 VCC = 5.25 V VCC = 5.25V, VI = 0V(All 9.8 –15 Outputs Disable) µA KΩ –85 52 mA mA 70 Notes: 1. All typical values are at VCC=5V, Ta=25°C,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 HD26LS32A Switching Characteristics (VCC = 5 V, Ta = 25°C) Item Symbol Propagation Delay Time tPLH Min Conditions CL = 15 pF tPHL tZH Output Enable Time CL = 15 pF tZL tHZ Output Disable Time CL = 5 pF tLZ Typ Max Unit 20 35 ns 22 35 17 22 20 25 21 30 30 40 ns ns 1. tPLH, tPHL Waveforms Test circuit VCC 2.5 V Output Input Input A 0V 0V –2.5 V 2 KΩ Pulse Generator 2.5 V CL Input B 0V –2.5 V 5 KΩ tPLH 2V 0V tPHL V OH Output 1.3 V 1.3 V V OL 4 HD26LS32A HD26LS32A 2. tHZ, tZH Test circuit Waveforms VCC Output 2 KΩ 3V S1 Enable G 2.5 V 1.3 V 1.3 V 0V CL Input 5 KΩ 3V Enable G 1.3 V 1.3 V 0V Pulse Generator 0.5 V 2V ≈1.4 V 1.3 V Output 0V tZH tHZ S1:Open S1:Closed 3. tLZ, tZL Test circuit Waveforms VCC Output 2 KΩ 3V Enable G –2.5 V 1.3 V 0V CL Input 1.3 V 5 KΩ 3V Enable G 1.3 V 1.3 V 0V Pulse Generator S2 2V 1.4 V Output 1.3 V VOL 0.5 V tZL tLZ S2:Open S2:Closed Notes: 1. The pulse generator has the following characteristics : PRR=1 MHZ, 50 % duty cycle, tr ≤ 6ns, tf ≤ 6ns, Zout=50 Ω. 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. 5