HD74HC147 Datasheet | Hitachi Semiconductor

Description The HD74HC147 features priority encoding of the inputs to ensure that only the highest order data line is encoded. Nine input lines are encoded to a four line BCD output. The implied decimal zero codition requires no input condition as zero is encoded when all nine data lines are at a high logic level. All data inputs and outputs are active at the low logic level. Features - - - - - High Speed Operation: tpd = 14.5 ns typ (CL = 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 Inputs 1 H X X X X X X X X L 2 H X X X X X X X L H 3 H X X X X X X L H H 4 H X X X X X L H H H 5 H X X X X L H H H H 6 H X X X L H H H H H 7 H X X L H H H H H H 8 H X L H H H H H H H 9 H L H H H H H H H H Outputs D H L L H H H H H H H C H H H L L L L H H H B H H H L L H H L L H A H L H L H L H L H L Pin Arrangement 4 1 5 2 Inputs 6 3 7 4 8 5 C 6 Outputs B 7 GND 8 B A 9 6 7 8 C D 3 2 1 5 4 16 VCC 15 NC 14 D 13 3 12 2 Inputs 11 1 10 9 9 A Output Output (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 voltage 2.0 4.5 6.0 4.5...