Tara participate you need to register. Where are the pullup resistors for your switches? A value like 10K on each switch should work well. Notice also that the identical post has occurred on multiple forums.
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Forums New posts Search forums. Click here to register now. Welcome to our site! The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. Sign up using Email and Password. They were only made in the s.
74189 RAM PDF
A 4 bit address input selects one of the 16 memory words. Note: for some obscure implementation reason, the actual and RAM integrated circuits use inverted outputs - the values on the output bus are the inverse of the data previously written into the RAM. Another chip in the TTL-series of integrated circuits, called the , was otherwise identical to the and circuits, but used non-inverting data outputs. See the demonstration applet to compare the behaviour of the RAM chips.