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Электронный компонент: HD74AC298

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HD74AC298/HD74ACT298
Quad 2-Input Multiplexer with Storage
Description
This device is a high-speed multiplexer with storage. 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 register is fully edge
triggered. The Data inputs (I
0
and I
1
) and Select input (S) must be stable only one setup time prior to the
HIGH-to-LOW transition of the clock for predictable operation.
Features
Outputs Source/Sink 24 mA
HD74ACT298 has TTL-Compatible Inputs
Pin Arrangement
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
I
1b
I
1a
I
0a
I
0b
I
1c
I
0d
I
1d
GND
V
CC
Q
a
Q
b
Q
c
Q
d
CP
S
I
0c
(Top view)
HD74AC298/HD74ACT298
2
Logic Symbol
Q
a
Q
b
Q
c
Q
d
S
CP
I
0a
I
1a
I
0b
I
1b
I
0c
I
1c
I
0d
I
1d
Pin Names
I
1a
I
1d
Source 1 Data Inputs
I
0a
I
0d
Source 0 Data Inputs
S
Select Input
CP
Clock Pulse Input (Active Falling Edge)
Q
a
Q
d
Outputs
Function Table
Inputs
Outputs
S
Cp
Q
a
Q
b
Q
c
Q
d
L
a
1
b
1
c
1
d
1
H
a
2
b
2
c
2
d
2
X
H
Q
A0
Q
B0
Q
C0
Q
D0
HD74AC298/HD74ACT298
3
Logic Diagram
S
CP
R
S
Q
a
CP
R
S
Q
b
CP
R
S
Q
c
CP
R
S
Q
d
Q
d
Q
c
Q
b
Q
a
I
1a
I
0a
I
1b
I
0b
I
1c
I
0c
I
1d
I
0d
CP
DC Characteristics (unless otherwise specified)
Item
Symbol
Max
Unit
Condition
Maximum quiescent supply current
I
CC
80
A
V
IN
= V
CC
or ground, V
CC
= 5.5 V,
Ta = Worst case
Maximum quiescent supply current
I
CC
8.0
A
V
IN
= V
CC
or ground, V
CC
= 5.5 V,
Ta = 25
C
Maximum I
CC
/input (HD74ACT298)
I
CCT
1.5
mA
V
IN
= V
CC
2.1 V, V
CC
= 5.5 V,
Ta = Worst case
AC Characteristics: HD74AC298
Ta = +25
C
C
L
= 50 pF
Ta = 40
C to +85
C
C
L
= 50 pF
Item
Symbol
V
CC
(V)*
1
Min
Typ
Max
Min
Max
Unit
Maximum count
f
max
3.3
90
--
--
70
--
MHz
frequency
5.0
110
--
--
100
--
Propagation delay
t
PLH
3.3
1.0
7.0
10.0
1.0
11.5
ns
CP to Q
5.0
1.0
5.0
7.5
1.0
8.5
Propagation delay
t
PHL
3.3
1.0
7.5
10.0
1.0
11.5
CP to Q
5.0
1.0
5.5
7.5
1.0
8.5
Note:
1. Voltage Range 3.3 is 3.3 V
0.3 V
Voltage Range 5.0 is 5.0 V
0.5 V
HD74AC298/HD74ACT298
4
AC Operating Requirements: HD74AC298
Ta = +25
C
C
L
= 50 pF
Ta = 40
C
to +85
C
C
L
= 50 pF
Item
Symbol
V
CC
(V)*
1
Typ
Guaranteed Minimum
Unit
Setup time, HIGH or LOW
t
su
3.3
4.5
5.5
7.0
ns
D or S to CP
5.0
2.5
4.5
5.5
Hold time, HIGH or LOW
t
h
3.3
2.0
0.0
0.0
ns
D
n
to CP
n
5.0
1.0
0.0
0.0
Hold time, HIGH or LOW
t
h
3.3
3.0
0.5
0.5
ns
S to CP
5.0
1.5
0.5
0.5
Pulse with
t
w
3.3
3.0
5.5
7.0
ns
5.0
3.0
4.5
5.0
Note:
1. Voltage Range 3.3 is 3.3 V
0.3 V
Voltage Range 5.0 is 5.0 V
0.5 V
AC Characteristics: HD74ACT298
Ta = +25
C
C
L
= 50 pF
Ta = 40
C to +85
C
C
L
= 50 pF
Item
Symbol
V
CC
(V)*
1
Min
Typ
Max
Min
Max
Unit
Maximum count
frequency
f
max
5.0
70
--
--
60
--
MHz
Propagation delay
CP to Q
t
PLH
5.0
1.0
6.0
10.0
1.0
11.0
ns
Propagation delay
CP to Q
t
PHL
5.0
1.0
6.5
10.0
1.0
11.0
Note:
1. Voltage Range 5.0 is 5.0 V
0.5 V
HD74AC298/HD74ACT298
5
AC Operating Requirements: HD74ACT298
Ta = +25
C
C
L
= 50 pF
Ta = 40
C
to +85
C
C
L
= 50 pF
Item
Symbol
V
CC
(V)*
1
Typ
Guaranteed Minimum
Unit
Setup time, HIGH or LOW
D
n
or S to CP
t
su
5.0
3.5
5.5
6.5
ns
Hold time, HIGH or LOW
D
n
to CP
t
h
5.0
5.0
1.0
1.0
ns
Hold time, HIGH or LOW
S to CP
t
h
5.0
0.5
1.0
1.0
ns
Pulse with
t
w
5.0
3.0
7.0
8.0
ns
Note:
1. Voltage Range 5.0 is 5.0 V
0.5 V
Capacitance
Item
Symbol
Typ
Unit
Condition
Input capacitance
C
IN
4.5
pF
V
CC
= 5.5 V
Power dissipation capacitance
C
PD
30
pF
V
CC
= 5.0 V