Datasheet covering the 74HC164 and 74HCT164, an 8-bit serial-in, parallel-out shift register without output latches. The document gives pin functions, clock and reset timing, logic levels and absolute maximum ratings; HCT parts are designed for TTL-compatible inputs. It helps when tracing faults on keypads, LED matrices and simple display drivers where outputs change during shifting. Verify the package and the HC or HCT marking on the fitted chip before swapping in a replacement from this reference.
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