TC74AC520

TOSHIBA TC74AC Series TC74AC520 TC74AC521 Features: High Speed: tpd = 6.4ns (typ.) at VCC = 5V Low Power Dissipation: ICC = 8µA (max.) at Ta = 25°C* High Noise Immunity: VNIH = VNIL = 28% VCC (min.) Symmetrical Output Impedance: ƒIOHƒ = IOL = 24mA (min.). Capability of driving 50Ω transmission lines. Balanced Propagation Delays: tpLH = tpHL Wide Operating Voltage Range: VCC (opr) = 2V~5.5V Pin and Function Compatible with 74F521 Available in DIP, SOIC and SOP Packages * for AC521 only Pin Assignment G1 P0 2 Q0 3 P1 4 Q1 5 P2 6 Q2 7 P3 8 Q3 9 GND 10 20 VCC 19 P=Q 18 Q7 17 P7 16 Q6 15 P6 14 Q5 13 P5 12 Q4 11 P4 (TOP VIEW) Truth Table INPUTS P, Q P=Q P≠Q X G L L H X: Don’t Care OUTPUT P=Q L H H 520: with Pull-up Resistor The TC74AC520 and TC74AC521 are advanced high speed CMOS 8-BIT DIGITAL COMPARATORS fabricated with silicon gate and double-layer metal wiring C2MOS technology. They achieve the high speed operation similar to equivalent Bipolar Schottky TTL, while maintaining the CMOS low power dissipation. They compare two 8-bit binary or BCD words applied inputs P0~P7, and inputs Q0~Q7, and indicate whether or not they are equal. The TC74AC520 is equipped with pull-up resistors (20Ω typ.) to inputs Q0~Q7 and features pull-up resistors on the Q inputs for switch data. A signal active low enable is provided to facilitate cascading of several packages to compare words greater than 8 bits. All inputs are equipped with protection circuits against static...