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74HC25974 Series

八位可寻址锁存器

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74HC25974 Series Product Details

The SN74HC/HCT259 is an 8-bit addressable latch. The device features four modes of operation. In the addressable latch mode, data on the D input is written into the latch addressed by the inputs A0 to A3. The addressed latch will follow the data input, non- addressed latches will retain their previous states. In memory mode, all latches retain their previous states and are unaffected by the data or address inputs. In the 3 -to- 8 decoding or demultiplexing mode, the addressed output follows the D input and all other outputs are LOW. In the reset mode, all outputs are forced LOW and unaffected by the data or address inputs. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC .

Features

Input levels:

For SN74HC259: CMOS level

For SN74HCT259: TTL level

Combined demultiplexer and 8-bit latch

Serial-to-parallel capability

Output from each storage bit available

Random (addressable) data entry

Easily expandable

Common reset input

Useful as a 3-to-8 active HIGH decoder

Specified from -40C to + 125C