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74ACT299 Datasheet(PDF) 2 Page - STMicroelectronics

No. de pieza 74ACT299
Descripción Electrónicos  8 BIT PIPO SHIFT REGISTER WITH ASYNCHRONOUS CLEAR
Download  13 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74ACT299 Datasheet(HTML) 2 Page - STMicroelectronics

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INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND F UNCTION
1, 19
S0, S1
Mode Select Inputs
2, 3
G1, G2
3 State Output Enable Inputs (Active LOW)
7, 13, 6, 14, 5, 15, 4, 16
A/QA to H/QH
Parallel Data Inputs or 3 State Parallel Outputs (Bus Driver)
8, 17
QA’ to QH’
Serial Outputs (Standard Output)
9
CLEAR
Asynchronous Master Reset Input (Active LOW)
11
SR
Serial Data Shift Right Input
12
CLOCK
Clock Input (LOW to HIGH, Edge-triggered)
18
SL
Serial Data Shift Left Input
10
GND
Ground (0V)
20
VCC
Positive Supply Voltage
TRUTH TABLE
MO DE
INPUTS
I NPUTS/ OUTPUTS
O UT PUT S
CLEAR
F UNCTIO N
SELECTED
OUTPUT
CONTRO L
CLO CK
SERI AL
A/Q A
H/Q H
QA’
QH’
S1
S0
G1*
G2*
SL
SR
Z
L
HHX
X
X
X
X
Z
Z
L
L
CLEAR
L
L
X
L
L
X
X
X
LLLL
L
X
LLL
X
X
X
LLLL
HOLD
H
LLLL
X
X
X
QA0
QH0
QA0
QH0
SHIFT
RIGHT
H
L
H
L
L
X
H
H
QGn
H
QGn
H
L
H
L
L
X
L
L
QGn
L
QGn
SHIFT
LEFT
H
H
L
L
L
H
X
QBn
H
QBn
H
H
H
L
L
L
L
X
QBn
L
QBn
L
LOAD
H
H
H
X
X
X
X
ahah
* When one or both output controls are high, the eight, input/output terminals arethe high impedanc e state: howewer sequential operation or clearing of
the register is not affected.
Z
: HIGH IMPEDANCE
Qn0 : THE LEVELOF An BEFORE THE INDICATED STEADYSTATEINPUTCONDITIONS WERE ESTABLISED.
Qnn : THE LEVELOF Qn BEFORETHE MOST RECENTACTIVETRANSITIONINDICATEDBY OR
a,h : THE LEVELOF THE STEADYSTATEINPUTSA, H, RESPECTIVELY.
X
: DON’T CARE
74ACT299
2/13


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