HD74HC670 4-by-4 Register File (with 3-state outputs) REJ03D0639-0200 (Previous ADE-205-521) Rev.
2.
00 Mar 30, 2006 Description The HD74HC670, 16-bit register file is organized as 4 words of 4 bits each and separate on-chip decoding is provided for addressing the four word locations to either write-in or retrieve data.
This permits simultaneous writing into one location and reading from another word location.
Four data inputs are available which are used to supply the 4-bit word to be stored.
Location of the word is determined by the write-address inputs A and B in conjunction with a write-enable signal.
Data applied at the inputs should be in its true form.
That is, if a high-level signal is...

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