MC14557屬于集成電路（IC）的移位寄存器。由安森美半導體公司制造生產(chǎn)的MC14557移位寄存器移位寄存器是低級邏輯器件，通常用于在串行和并行方式之間轉換數(shù)字邏輯信號形式的數(shù)據(jù)，或在數(shù)字字內移動數(shù)據(jù)位的位置。移位寄存器通常使用集成到一個設備中的一組觸發(fā)器來實現(xiàn)，常用于集成度更高的邏輯器件，但仍可用于 I/O 擴展等應用，在這些應用中離散形式的函數(shù)可能會非常有用。

1-to-64 Bit Variable Length Shift Register

The MC14557B is a static clocked serial shift register whose length may be programmed to be any number of bits between 1 and 64. The number of bits selected is equal to the sum of the subscripts of the enabled Length Control inputs (L1, L2, L4, L8, L16, and L32) plus one. Serial data may be selected from the A or B data inputs with the A/B select input. This feature is useful for recirculation purposes. A Clock Enable (CE) input is provided to allow gating of the clock or negative edge clocking capability.

The device can be effectively used for variable digital delay lines or simply to implement odd length shift registers.

? 1?64 Bit Programmable Length

? Q and Q Serial Buffered Outputs

? Asynchronous Master Reset

? All Inputs Buffered

? No Limit On Clock Rise and Fall Times

? Supply Voltage Range = 3.0 Vdc to 18 Vdc

? Capable of Driving Two Low?power TTL Loads or one Low?power

Schottky TTL Load Over the Rated Temperature Range

? These Devices are Pb?Free and are RoHS Compliant