HD74HC684

HD74HC682/HD74HC684 8-bit Magnitude Comparator Description These magnitude comparators perform comparisons of two eight-bit binary or BCD words. All types provide P=Q outputs and provide P>Q outputs. The HD74HC682 features 20 k pullup termination resistors on the Q inputs for analog or switch data. Type HD74HC682 HD74HC684 P=Q Yes Yes P>Q Yes Yes Output Enable No No 20 kΩ Pullup Yes No Features High Speed Operation High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) Function Table Input Data P, Q P=Q P>Q PQ H L H 1. The PQ Outputs to a 2-input NAND gate. HD74HC682/HD74HC684 Pin Arrangement HD74HC682/HD74HC684 P>Q P0 Q0 P1 Q1 P2 Q2 P3 Q3 1 2 3 4 5 6 7 8 9 20 VCC 19 P=Q 18 Q7 17 P7 16 Q6 15 P6 14 Q5 13 P5 12 Q4 11 P4 (Top view) GND 10 2 HD74HC682/HD74HC684 Logic Diagram HD74HC682/HD74HC684 P0 Q0 P1 Q1 P2 Q2 P3 Q3 P4 Q4 P5 Q5 P6 Q6 P7 Q7 VCC P=Q VCC P>Q VCC 3 HD74HC682/HD74HC684 DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = –40 to +85°C Max — — — — 1.35 1.8 — — — — — 0.1 0.1 0.1 0.33 0.33 ±1.0 40 ±1.0 –0.7 — — 5.6 40 µA µA µA mA mA µA I OL = 4 mA I OL = 5.2 mA Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA Vin = VCC Iin = GND Qn = GND, other inputs = V CC or GND Iout = 0 µA Qn = VCC, other inputs = V CC or GND Iout = 0 µA V I ...