4069 Inverter -problem

[FireAce]

Hey fellows, I just used a 4069 for the first time in one of my circuits. I have a little problem, and wonder if its the nature of the chip. When I send a high to one of the inputs, it not only makes the output low, but it makes ALL the rest of the IC's outputs low.

A simulation in Yenka proves this shouldnt be so. Can anyone clarify?

Thanks

 

[Pommie]

Unless you tie the unused inputs high or low they will get influenced by any capacitive coupling or simply oscillate.

Mike.

 

[FireAce]

Thanks Pommie

I am using only two of the six inverters. When input 1 is made high, it will send its output to low, and also output 2 to low. Am I needing a 10k resistor between input 1 and ground, between input 2 and ground, and then simply ground the unused inputs?

Edit: The 10k resistors did the trick. Thanks for the tip!