SN54ALS259

8-Bit Parallel-Out Storage Register Performs Serial-to-Parallel Conversion With Storage Asynchronous Parallel Clear Active-High Decoder Enable/Disable Input Simplifies Expansion Expandable for n-Bit Applications Four Distinct Functional Modes Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs description SN54ALS259, SN74ALS259 8ĆBIT ADDRESSABLE LATCHES ą SDAS217A − DECEMBER 1982 − REVISED DECEMBER 1994 SN54ALS259 . . . J PACKAGE SN74ALS259 . . . D OR N PACKAGE (TOP VIEW) S0 1 S1 2 S2 3 Q0 4 Q1 5 Q2 6 Q3 7 GND 8 16 VCC 15 CLR 14 G 13 D 12 Q7 11 Q6 10 Q5 9 Q4 SN54ALS259 . . . FK PACKAGE (TOP VIEW) S1 S0 NC VCC CLR These 8-bit addressable latches are designed for general-purpose storage applications in digital systems. Specific uses include working registers, serial-holding registers, and active-high decoders or demultiplexers. They are multifunctional devices capable of storing single-line data in eight addressable latches and being a 1-of-8 decoder or demultiplexer with active-high outputs. 3 2 1 20 19 S2 4 18 G Q0 5 17 D NC 6 16 NC Q1 7 15 Q7 Q2 8 14 Q6 9 10 11 12 13 Four distinct modes of operation are selectable by Q3 GND NC Q4 Q5 controlling the clear (CLR) and enable (G) inputs as shown in the function table. In the addressable-latch mode, data at the data-in NC − No internal connection terminal is written into the addressed latch. The addres...