INPUT BUFFER FROM LOW-OUTPUT TTL TO CMOS

摘要

PROBLEM TO BE SOLVED: To obtain the input buffer from TTL which has small output consumption to CMOS by generating a 2nd output signal which has the same logic state with a TTL signal and matches a CMOS voltage level according to the TTL signal and a 1st output signal. SOLUTION: Transistors(TR) T4 to T6 constitute a pull-down circuit 30. TRs T1 to T3 and T7 form one pull-up circuit and raise the voltage level of an input signal TTLin to a specific CMOS voltage level. The output signal output of the whole circuit is led out of the drain of the TR T2 and reaches a ground level voltage since the TR T7 is ON. Further, the voltage of this output signal output is held through the operation of the TR T1 which is on and the TR T2 which is OFF. Consequently, the consumption of the output can be reduced.