MM54HC42

MM54HC42 MM74HC42 BCD-to-Decimal Decoder January 1988 MM54HC42 MM74HC42 BCD-to-Decimal Decoder General Description This decoder utilizes advanced silicon-gate CMOS technology Data on the four input pins select one of the 10 outputs corresponding to the value of the BCD number on the inputs An output will go low when selected otherwise it remains high If the input data is not a valid BCD number all outputs will remain high The circuit has high noise immunity and low power consumption usually associated with CMOS circuitry yet also has speeds comparable to low power Schottky TTL (LS-TTL) circuits and is capable of driving 10 LS-TTL equivalent loads All inputs are protected from damage due to static discharge by diodes to VCC and ground Features Y Y Y Y Typical propagation delay 15 ns Wide supply range 2V – 6V Low quiescent current 80 mA (74HC) Fanout of 10 LS-TTL loads Connection Diagram Dual-in-line Package Truth Table No Inputs D C B A 0 L L L L L L L L L H L L L H H H H H INVALID H H H H H H L L L L H H H H L L H H L L H H L L H H L L H H L H L H L H L H L H L H L H L H L H H H H H H H H H H H H H H H 1 H L H H H H H H H H H H H H H H 2 H H L H H H H H H H H H H H H H 3 H H H L H H H H H H H H H H H H Outputs 4 H H H H L H H H H H H H H H H H 5 H H H H H L H H H H H H H H H H 6 H H H H H H L H H H H H H H H H 7 H H H H H H H L H H H H H H H H 8 H H H H H H H H L H H H H H H H 9 H H H H H H H H H L H H H H H H TL F 5301 – 1 Top View Order Number MM54HC42 or MM74HC42 ...