SN74ALS259 Datasheet | Texas Instruments

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 - No internal connection terminal is written into the addressed latch. The addressed latch follows the data input with all unaddressed latches remaining in their previous states. In the memory mode, all latches remain in their previous states and are unaffected by the data or address inputs. To eliminate the possibility of entering erroneous data in the latches, G should be held high (inactive) while the address lines are changing. In the 1-of-8 decoding or demultiplexing mode, the addressed output follows the level of the D input with all other outputs low. In the clear mode, all outputs are low and unaffected by the address and data inputs. The SN54ALS259 is characterized for operation over the full military temperature range of - 55°C to 125°C. The SN74ALS259 is characterized for operation from 0°C to 70°C. Function Tables FUNCTION INPUTS CLR G OUTPUT OF EACH ADDRESSED OTHER LATCH OUTPUT FUNCTION...