MM54HC147 Datasheet | National Semiconductor

Description This high speed 10-to-4 Line Priority Encoder utilizes advanced silicon-gate CMOS technology It possesses the high noise immunity and low power consumption of standard CMOS integrated circuits This device is fully buffered giving it a fanout of 10 LS-TTL loads The MM54HC147 MM74HC147 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 condition 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 The 54HC 74HC logic family is functionally as well as pinout patible with the standard 54LS 74LS logic family All inputs are protected from damage due to static discharge by internal diode clamps to VCC and ground Features Low quiescent power consumption 40 m W maximum at 25 C High speed 31 ns propagation delay (typical) Low input current 1 m A maximum Wide supply range 2V to 6V Connection and Logic Diagrams Dual-In-Line Package TL F 5007 - 1 Top View Order Number MM54HC147 or MM74HC147 Truth 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 D H L L H H H H H H H Outputs 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 TL F 5007 - 2 H e High Logic Level L e Low Logic Level X e Irrelevant C1995 National Semiconductor Corporation TL F 5007 RRD-B30M115 Printed in U S A Absolute Maximum Ratings (Notes 1 2) Operating Conditions Supply Voltage (VCC) DC Input or Output Voltage (VIN VOUT) Operating Temp Range (TA) MM74HC MM54HC Input Rise or Fall Times VCC e 2 0V (tr tf) VCC e 4 5V VCC e 6 0V Min 2 0 Max 6 VCC Units V V If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for...