SN54ALS259 Texas instruments

SN54ALS259

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SN54ALS259

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Описание

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. Four distinct modes of operation are selectable by controlling the clear () and enable (G\) inputs as shown in the function table. In the addressable-latch mode, data at the data-in 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.

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

Function	Addressable latch
Number of channels	8
Technology family	ALS
Supply voltage (min) (V)	4.5
Supply voltage (max) (V)	5.5
Input type	Bipolar
Output type	Push-Pull
Data rate (max) (MBits)	150
IOL (max) (mA)	4
IOH (max) (mA)	-0.4
Features	Ultra high speed (tpd
Operating temperature range (°C)	-55 to 125
Rating	Military