Ttl Off
Can someone help me with a TTL/CMOS switch?
I have been playing around with a JK flip-flop on a logic simulator and on a breadboard to make a simple switch which when J goes momentarily high, Q goes high, and it keeps Q high until K goes high momentarily which makes Q go low. It all works perfect except that the TI 74HC112 chip I am using considers a floating J or K pin as high which screws up the design.
Is there any TTL or CMOS logic chip that can do what I want? All I need is it to turn on and stay on when a high signal comes from one input and completely turn off if a high signal comes from another input. I can’t ground the inputs; so, I have to have them floating the majority of the time.
Use a pull-down resistor. Which, is a resistor from each input to ground. A typical value is 220 Ohm to 330 Ohm. Of course the 330Ohm will use less current.
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