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74LVQ299 датащи(PDF) 2 Page - STMicroelectronics

номер детали 74LVQ299
подробное описание детали  8 BIT PIPO SHIFT REGISTER WITH ASYNCHRONOUS CLEAR
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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74LVQ299 датащи(HTML) 2 Page - STMicroelectronics

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74LVQ299
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Figure 2: Input And Output Equivalent Circuit
Table 2: Pin Description
Table 3: Truth Table
* When one or both controls are high, the eight input/output terminals are the high impedance state: however sequential operation or cleaning
of the register is not affected.
Z: High Impedance
Qn0: The level of An before the indicated steady state input conditions were established.
Qnn: The level of Qn before the most recent active transition indicated by OR
a, h: The level of the steady state inputs A, H, respectively.
X: Don’t Care
PIN N°
SYMBOL
NAME AND FUNCTION
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’,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
MODE
INPUTS
INPUTS/OUTPUTS
OUTPUTS
CLEAR
FUNCTION
SELECTED
OUTPUT
CONTROL
CLOCK
SERIAL
A/QA
H/QH
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
LLL
L
L
X
L
L
L
X
X
X
LLL
L
HOLD
H
L
L
L
L
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
HH
L
L
L
H
X
QBn
H
QBn
H
HH
L
L
L
L
X
QBn
L
QBn
L
LOAD
HHHX
X
X
X
a
h
a
h


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