HD74HC280 Datasheet | Hitachi Semiconductor

Description This parity generator/checker features odd/even outputs to facilitate operation of either odd or even parity applications. The word length capability is easily expanded by cascading devices. Features - - - - - High Speed Operation: tpd (Data to Even or Odd) = 22 ns typ (C L = 50 p F) 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 Outputs Number of inputs A through I that are high 0, 2, 4, 6, 8 1, 3, 5, 7, 9 ∑ Even H L ∑ Odd L H Pin Arrangement G Inputs H NC Input I ∑ Even Outputs ∑ Odd GND 1 G 2 3 4 5 6 7 I ∑ Even ∑ Odd A H F E D C B 14 13 12 11 10 9 8 VCC F E D Inputs C B A (Top view) DC Characteristics Ta = 25°C Item Input voltage Symbol VIH Ta = - 40 to +85°C Max - - - 0.5 1.35 1.8 - - - - - 0.1 0.1 0.1 0.33 0.33 ±1.0 40 µA µA I OL = 4 m A I OL = 5.2 m A Vin = VCC or GND Vin = VCC or GND, Iout = 0 µA V I OH = - 4 m A I OH = - 5.2 m A Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = - 20 µA V Unit V Test Conditions VCC (V) Min Typ Max Min 2.0 4.5 6.0 1.5 - 3.15 - 4.2 - - - - - - - - - - 0.5 1.5 3.15 4.2 - VIL 2.0 4.5 6.0 - 1.8 - 1.9 4.4 5.9 4.13 5.63 - - - Output...