SL74HC datasheet(7/10 Pages) SLS

Numer części	SL74HC

Szczegółowy opis	8-Bit Serial-Input/Serial or Parallel-Output Shift Register with Latched 3-State Outputs

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SL74HC595

System Logic

Semiconductor

SLS

FUNCTION TABLE

Inputs

Resulting Function

Operation

Reset Serial

Input

A

Shift

Clock

Latch

Clock

Output

Enable

Shift

Register

Contents

Latch

Register

Contents

Serial

Output

SQH

Parallel

Outputs

QA-QH

Reset shift register

L

X

L,H,

L

U

L

U

Shift data into shift

register

H

D

L,H,

L

D

SRA

SRN SRN+1

U

SRG SRH

U

Shift register remains

unchanged

H

X

L,H,

L

U

Transfer shift register

contents to latch

register

H

X

L,H,

L

U

SRN LRN

U

SRN

Latch register remains

unchanged

X

L,H,

L

*

U

*

U

Enable parallel

outputs

X

L

*

**

*

Enabled

Force outputs into

high-impedance state

X

H

*

**

*

Z

SR = shift register contents

X = don’t care

LR = latch register contents

Z = high impedance

D = data (L,H) logic level

* = depends on Reset and Shift Clock inputs

U = remains unchanged

** = depends on Latch Clock input

PIN DESCRIPTIONS

INPUTS:

A - Serial Data Input. The data on this pin is shifted

into the 8-bit serial shift register.

CONTROL INPUTS:

Shift Clock - Shift Register Clock Input. A low-to-

high transition on this input causes the data at the

Serial Input pin to be shifted into the 8-bit shift

register.

Reset - Active-low, Asynchronous, Shift Register

Reset Input. A low on this pin resets the shift

register portion of this device only. The 8-bit latch

is not affected.

Latch Clock - Storage Latch Clock Input. A low-to-

high transition on this input latches the shift

register data.

Output Enable - Active-Low Output Enable. A low

on this input allows the data from the latches to

bepresented at the outputs. A high on this input

forces the outputs (QA-QH) into the high-impedance

state. The serial output is not affected by this

control unit.

OUTPUTS:

QA-QH - Noninverted, 3-state, latch outputs.

SQH - Voninverted, Serial Data Output. This is the

output of the eighth stage of the 8-bit shift register.

This output does not have three-state capability.

Podobny numer części - SL74HC

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System Logic Semiconduc...	SL74HC	40Kb / 4P	Quad 2-Input NAND Gate
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Podobny opis - SL74HC

Producent	Numer części	Arkusz danych	Szczegółowy opis
ON Semiconductor	MC74HC595A	248Kb / 12P	8-Bit Serial-Input/Serial or Parallel-Output Shift Register with Latched 3-State Outputs March, 2000 ??Rev. 8
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