NXP 逻辑集成电路 移位寄存器 74HC595D

74HC595D

74HC595D

FEATURES

• 8-bit serial input

• 8-bit serial or parallel output

• Storage register with 3-state outputs

• Shift register with direct clear

• 100 MHz (typical) shift out frequency

• ESD protection:

HBM EIA/JESD22-A114-A exceeds 2000 V

MM EIA/JESD22-A115-A exceeds 200 V.

74HC595D

APPLICATIONS

• Serial-to-parallel data conversion

• Remote control holding register.

DESCRIPTION

The 74HC/HCT595 are high-speed Si-gate CMOS devices

and are pin compatible with low power Schottky TTL

(LSTTL). They are specified in compliance with JEDEC

standard no. 7A.

The 74HC/HCT595 is an 8-stage serial shift register with a

storage register and 3-state outputs. The shift register and

storage register have separate clocks.

Data is shifted on the positive-going transitions of the

SH_CP input. The data in each register is transferred to

the storage register on a positive-going transition of the

ST_CP input. If both clocks are connected together, the

shift register will always be one clock pulse ahead of the

storage register.

The shift register has a serial input (DS) and a serial

standard output (Q7’) for cascading. It is also provided

with asynchronous reset (active LOW) for all 8 shift

register stages. The storage register has 8 parallel 3-state

bus driver outputs. Data in the storage register appears at

the output whenever the output enable input (OE) is LOW.