SN74F299NSR屬于集成電路（IC）的移位寄存器。由美國德州儀器公司制造生產(chǎn)的SN74F299NSR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(zhuǎn)換數(shù)字邏輯信號形式的數(shù)據(jù)，或在數(shù)字字內(nèi)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(shè)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(kuò)展等應(yīng)用，在這些應(yīng)用中離散形式的函數(shù)可能會非常有用。

Four Modes of Operation:

? Hold (Store)

? Shift Right

? Shift Left

? Load Data

Operates With Outputs Enabled or at High

Impedance

3-State Outputs Drive Bus Lines Directly

Can Be Cascaded for N-Bit Word Lengths

Direct Overriding Clear

Applications:

? Stacked or Pushdown Registers

? Buffer Storage

? Accumulator Registers

description/ordering information

These 8-bit universal shift/storage registers

feature multiplexed I/O ports to achieve full 8-bit

data handling in a single 20-pin package. Two

function-select (S0, S1) inputs and two

output-enable (OE1, OE2) inputs can be used to

choose the modes of operation listed in the

function table.

Synchronous parallel loading is accomplished by

taking both S0 and S1 high. This places the

3-state outputs in a high-impedance state and

permits data that is applied on the I/O ports to

be clocked into the register. Reading out of the register can be accomplished while the outputs are enabled in

any mode. Clearing occurs when the clear (CLR) input is low. Taking either OE1 or OE2 high disables the outputs

but has no effect on clearing, shifting, or storage of data.