CD74HC194PW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CD74HC194PW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。

Features

? Four Operating Modes

- Shift Right, Shift Left, Hold and Reset

? Synchronous Parallel or Serial Operation

? Typical fMAX = 60MHz at VCC = 5V, CL = 15pF,

TA = 25oC

? Asynchronous Master Reset

? Fanout (Over Temperature Range)

- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

? Wide Operating Temperature Range . . . -55oC to 125oC

? Balanced Propagation Delay and Transition Times

? Significant Power Reduction Compared to LSTTL

Logic ICs

? HC Types

- 2V to 6V Operation

- High Noise Immunity: NIL = 30%, NIH = 30% of VCC

at VCC = 5V

? HCT Types

- 4.5V to 5.5V Operation

- Direct LSTTL Input Logic Compatibility,

VIL= 0.8V (Max), VIH = 2V (Min)

- CMOS Input Compatibility, Il ≤ 1μA at VOL, VOH

Description

The ’HC194 and CD74HCT194 are 4-bit shift registers with

Asynchronous Master Reset (MR). In the parallel mode (S0

and S1 are high), data is loaded into the associated flip-flop

and appears at the output after the positive transition of the

clock input (CP). During parallel loading serial data flow is

inhibited. Shift left and shift right are accomplished

synchronously on the positive clock edge with serial data

entered at the shift left (DSL) serial input for the shift left

mode, and at the shift right (DSR) serial input for the shift

right mode. Clearing the register is accomplished by a Low

applied to the Master Reset (MR) pin.