M74VHC594RMTR(2004) 查看數據表（PDF） - STMicroelectronics

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M74VHC594RMTR
(Rev.:2004)

8 BIT SHIFT REGISTER WITH OUTPUT REGISTER

STMicroelectronics 

74VHC594

Figure 2: Input Equivalent Circuit

Table 2: Pin Description

PIN N°

SYMBOL NAME AND FUNCTION

1, 2, 3, 4, 5, QA to QH Data Outputs

6, 7, 15

9

QH’

Serial Data Output

10

SCLR Shift Register Clear Input

11

SCK Shift Register Clock Input

13

RCLR Storage Register Clear

Input

14

SI

Serial Data Input

uct(s) Table 3: Truth Table

rod INPUTS

P SI

SCK

SCLR

te X

X

L

ole L

H

RCK

X

X

- Obs H

H

X

t(s) L

H

X

c X

X

X

X

du X

X

X

ro X

X

X

Obsolete P X: Don’t Care

12

RCK Storage Register Clock

Input

8

GND Ground (0V)

16

VCC

Positive Supply Voltage

RCLR

X

X

X

OUTPUTS

SHIFT REGISTER IS CLEAR

FIRST STAGE OF SHIFT REGISTER GOES LOW

OTHER STAGES STORE THE DATA OF PREVI-

OUS STAGE, RESPECTIVELY

FIRST STAGE OF SHIFT REGISTER GOES HIGH

OTHER STAGES STORE THE DATA OF PREVI-

OUS STAGE, RESPECTIVELY

X

SHIFT REGISTER STATE IS NOT CHANGED

L

STORAGE REGISTER IS CLEARED

H

SHIFT REGISTER DATA IS STORED IN THE

STORAGE REGISTER

H

STORAGE REGISTER STATE IS NOT CHANGED

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