74HC147D,653 NXP

INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications The IC06 74HC/HCT/HCU/HCMOS Logic Package Information The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines 74HC/HCT147 10-to-4 line priority encoder December 1990 Product specication File under Integrated Circuits, IC06Philips Semiconductors Product specication 10-to-4 line priority encoder 74HC/HCT147 FEATURES GENERAL DESCRIPTION Encodes 10-line decimal to 4-line BCD The 74HC/HCT147 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL Useful for 10-position switch encoding (LSTTL). They are specified in compliance with JEDEC Used in code converters and generators standard no. 7A. Output capability: standard The 74HC/HCT147 9-input priority encoders accept data from nine active LOW inputs (A to A ) and provide a 0 8 I category: MSI CC binary representation on the four active LOW outputs (Y to Y ). A priority is assigned to each input so that when 0 3 two or more inputs are simultaneously active, the input with the highest priority is represented on the output, with input line A having the highest priority. 8 The devices provide the 10-line to 4-line priority encoding function by use of the implied decimal zero. The zero is encoded when all nine data inputs are HIGH, forcing all four outputs HIGH. QUICK REFERENCE DATA GND = 0 V T = 25 C t = t = 6 ns amb r f TYPICAL SYMBOL PARAMETER CONDITIONS UNIT HC HCT t / t propagation delay A to Y C = 15 pF V = 5 V 15 17 ns PHL PLH n n L CC C input capacitance 3.5 3.5 pF I C power dissipation capacitance per package notes 1 and 2 30 33 pF PD Notes 1. C is used to determine the dynamic power dissipation (P in W): PD D 2 2 P = C V f + (C V f ) where: D PD CC i L CC o f = input frequency in MHz i f = output frequency in MHz o 2 (C V f ) = sum of outputs L CC o C = output load capacitance in pF L V = supply voltage in V CC 2. For HC the condition is V = GND to V I CC For HCT the condition is V = GND to V - 1.5 V I CC ORDERING INFORMATION See 74HC/HCT/HCU/HCMOS Logic Package Information. December 1990 2