74HC594DB屬于集成電路（IC）的移位寄存器。由安世半導(dǎo)體(中國)有限公司制造生產(chǎn)的74HC594DB移位寄存器移位寄存器是低級(jí)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(hào)形式的數(shù)據(jù)，或在數(shù)字字內(nèi)移動(dòng)數(shù)據(jù)位的位置。移位寄存器通常使用集成到一個(gè)設(shè)備中的一組觸發(fā)器來實(shí)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(huì)非常有用。

1. General description

The 74HC594; 74HCT594 is an 8-bit serial-in/serial or parallel-out shift register with a storage

register. Separate clock and reset inputs are provided on both shift and storage registers. The

device features a serial input (DS) and a serial output (Q7S) to enable cascading. Data is shifted

on the LOW-to-HIGH transitions of the SHCP input, and the data in the shift register is transferred

to the storage register on a LOW-to-HIGH transition of the STCP input. If both clocks are

connected together, the shift register will always be one clock pulse ahead of the storage register.

A LOW level on one of the two register reset pins (SHR and STR) will clear the corresponding

register. Inputs include clamp diodes. This enables the use of current limiting resistors to interface

inputs to voltages in excess of VCC.

2. Features and benefits

? Synchronous serial input and output

? 8-bit parallel output

? Shift and storage registers have independent direct clear and clocks

? Independent clocks for shift and storage registers

? 100 MHz (typical)

? Wide supply voltage range from 2.0 V to 6.0 V

? CMOS low power dissipation

? High noise immunity

? Latch-up performance exceeds 100 mA per JESD 78 Class II Level B

? Input levels:

? For 74HC594: CMOS level

? For 74HCT594: TTL level

? Complies with JEDEC standards

? JESD8C (2.7 V to 3.6 V)

? JESD7A (2.0 V to 6.0 V)

? ESD protection:

? HBM JESD22-A114F exceeds 2 kV

? MM JESD22-A115-A exceeds 200 V (C = 200 pF, R = 0 Ω)

? Multiple package options

? Specified from -40 °C to +85 °C and from -40 °C to +125 °C

3. Applications

? Serial-to parallel data conversion

? Remote control holding register