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The only databook I have that has anything on it dates fromand byit was no longer listed in any of them. Or rather, were never consistently named in the first place, and eventually everyone stopped using the 74xxx designations. You must log in or register to reply here. Articles Top Articles Search resources. The wires I had bought were faulty. Replacement Transformer Started by ncag Today at 7: Notice also that the identical post has occurred on multiple forums.
Datasheet, PDF — Alldatasheet Papabravo Well-Known Member Oct 2, Note that the value given is positive 40 uAwhich means that the external circuit must source current in order to drive the input high — i. Media New media New comments Search media.
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. It shows a table with the current memory data contents hex encoded , with the memory addresses on the left and the data stored at the address on the right.
74189 DATASHEET PDF