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SN54LS298 Fiches technique(PDF) 2 Page - Motorola, Inc

No de pièce SN54LS298
Description  QUAD 2-INPUT MULTIPLEXER WITH STORAGE
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Fabricant  MOTOROLA [Motorola, Inc]
Site Internet  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

SN54LS298 Fiches technique(HTML) 2 Page - Motorola, Inc

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FAST AND LS TTL DATA
SN54/74LS298
LOGIC OR BLOCK DIAGRAM
S
I1a
I0a
I1b
I0b
I1c
I0c
I1d
I0d
CP
R
CP
S Qa
R
CP
S Qb
Qa
Qb
Qc
Qd
14
1
2
6
7
3
4
5
9
11
12
10
13
15
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
R
CP
S Qc
R
CP
S Qd
FUNCTIONAL DESCRIPTION
The LS298 is a high speed Quad 2-Port Register. It selects
four bits of data from two sources (ports)under the control of a
Common Select Input (S). The selected data is transferred to
the 4-bit output register synchronous with the HIGH to LOW
transition of the Clock input (CP). The 4-bit output register is
fully edge-triggered. The Data inputs (I) and Select input (S)
must be stable only one setup time prior to the HIGH to LOW
transition of the clock for predictable operation.
TRUTH TABLE
INPUTS
OUTPUT
S
I0
I1
Q
I
I
X
L
I
h
X
H
h
X
I
L
h
X
h
H
L = LOW Voltage Level
H = HIGH Voltage Level
X = Don’t Care
I = LOW Voltage Level one setup time prior to the HIGH to LOW clock transition.
h = HIGH Voltage Level one setup time prior to the HIGH to LOW clock transition.
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
TA
Operating Ambient Temperature Range
54
74
– 55
0
25
25
125
70
°C
IOH
Output Current — High
54, 74
– 0.4
mA
IOL
Output Current — Low
54
74
4.0
8.0
mA


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