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Электронный компонент: CD74ACT251

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1
Data sheet acquired from Harris Semiconductor
SCHS246
Features
Buffered Inputs
Typical Propagation Delay
- 6ns at V
CC
= 5V, T
A
= 25
o
C, C
L
= 50pF
Exceeds 2kV ESD Protection MIL-STD-883, Method
3015
SCR-Latchup-Resistant CMOS Process and Circuit
Design
Speed of Bipolar FASTTM/AS/S with Significantly
Reduced Power Consumption
Balanced Propagation Delays
AC Types Feature 1.5V to 5.5V Operation and
Balanced Noise Immunity at 30% of the Supply
24mA Output Drive Current
- Fanout to 15 FASTTM ICs
- Drives 50
Transmission Lines
Pinout
CD74AC251, CD74ACT251
(PDIP, SOIC)
TOP VIEW
Description
The CD74AC251 and CD74ACT251 8-input multiplexers that
utilize the Harris Advanced CMOS Logic technology. This
multiplexer features both true (Y) and complement (Y) outputs
as well as an Output Enable (OE) input. The OE must be at a
LOW logic level to enable this device. When the OE input is
HIGH, both outputs are in the high-impedance state. When
enabled, address information on the data select inputs deter-
mines which data input is routed to the Y and Y outputs.
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
I
3
I
2
I
1
I
0
Y
Y
GND
OE
V
CC
I
5
I
6
I
7
S0
S1
S2
I
4
Ordering Information
PART
NUMBER
TEMP.
RANGE (
o
C)
PACKAGE
PKG.
NO.
CD74AC251E
0 to 70
o
C, -40 to 85,
-55 to 125
16 Ld PDIP
E16.3
CD74ACT251E
0 to 70
o
C, -40 to 85,
-55 to 125
16 Ld PDIP
E16.3
CD74AC251M
0 to 70
o
C, -40 to 85,
-55 to 125
16 Ld SOIC
M16.15
CD74ACT251M
0 to 70
o
C, -40 to 85,
-55 to 125
16 Ld SOIC
M16.15
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer and die for this part number is available which meets all elec-
trical specifications. Please contact your local sales office or Harris
customer service for ordering information.
August 1998
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
FASTTM is a Trademark of Fairchild Semiconductor.
Copyright
Harris Corporation 1998
CD74AC251,
CD74ACT251
8-Input Multiplexer, Three-State
File Number
1981.1
2
Functional Diagram
TRUTH TABLE
INPUTS
OUTPUTS
SELECT
OUTPUT ENABLE OE
Y
Y
S2
S1
S0
X
X
X
H
Z
Z
L
L
L
L
I
0
I
0
L
L
H
L
I
1
I
1
L
H
L
L
I
2
I
2
L
H
H
L
I
3
I
3
H
L
L
L
I
4
I
4
H
L
H
L
I
5
I
5
H
H
L
L
I
6
I
6
H
H
H
L
I
7
I
7
H = High logic level, L = Low logic level, Z = High impedance (off),
X = Irrelevant, I
0
, I
1
...I
7
= The level of the respective input
5
6
Y
Y
4
3
2
1
14
12
13
15
I
0
I
7
I
6
I
5
I
4
I
3
I
2
I
1
11
S
0
10
S
1
9
S
2
THREE-STATE
7
DISABLE OE
CHANNEL
INPUTS
DATA
SELECT
OUTPUTS
CD74AC251, CD74ACT251
3
Absolute Maximum Ratings
Thermal Information
DC Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 6V
DC Input Diode Current, I
IK
For V
I
< -0.5V or V
I
> V
CC
+ 0.5V
. . . . . . . . . . . . . . . . . . . . . .
20mA
DC Output Diode Current, I
OK
For V
O
< -0.5V or V
O
> V
CC
+ 0.5V
. . . . . . . . . . . . . . . . . . . .
50mA
DC Output Source or Sink Current per Output Pin, I
O
For V
O
> -0.5V or V
O
< V
CC
+ 0.5V
. . . . . . . . . . . . . . . . . . . .
50mA
DC V
CC
or Ground Current, I
CC or
I
GND
(Note 3)
. . . . . . . . .
100mA
Operating Conditions
Temperature Range, T
A
. . . . . . . . . . . . . . . . . . . . . . -55
o
C to 125
o
C
Supply Voltage Range, V
CC
(Note 4)
AC Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V
ACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V
DC Input or Output Voltage, V
I
, V
O
. . . . . . . . . . . . . . . . . 0V to V
CC
Input Rise and Fall Slew Rate, dt/dv
AC Types, 1.5V to 3V . . . . . . . . . . . . . . . . . . . . . . . . . 50ns (Max)
AC Types, 3.6V to 5.5V . . . . . . . . . . . . . . . . . . . . . . . . 20ns (Max)
ACT Types, 4.5V to 5.5V. . . . . . . . . . . . . . . . . . . . . . . 10ns (Max)
Thermal Resistance (Typical, Note 5)
JA
(
o
C/W)
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
___
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
___
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . 150
o
C
Maximum Storage Temperature Range . . . . . . . . . .-65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300
o
C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
3. For up to 4 outputs per device, add
25mA for each additional output.
4. Unless otherwise specified, all voltages are referenced to ground.
5.
JA
is measured with the component mounted on an evaluation PC board in free air.
DC Electrical Specifications
PARAMETER
SYMBOL
TEST
CONDITIONS
V
CC
(V)
25
o
C
-40
o
C TO
85
o
C
-55
o
C TO
125
o
C
UNITS
V
I
(V)
I
O
(mA)
MIN
MAX
MIN
MAX
MIN
MAX
AC TYPES
High Level Input Voltage
V
IH
-
-
1.5
1.2
-
1.2
-
1.2
-
V
3
2.1
-
2.1
-
2.1
-
V
5.5
3.85
-
3.85
-
3.85
-
V
Low Level Input Voltage
V
IL
-
-
1.5
-
0.3
-
0.3
-
0.3
V
3
-
0.9
-
0.9
-
0.9
V
5.5
-
1.65
-
1.65
-
1.65
V
High Level Output Voltage
V
OH
V
IH
or V
IL
-0.05
1.5
1.4
-
1.4
-
1.4
-
V
-0.05
3
2.9
-
2.9
-
2.9
-
V
-0.05
4.5
4.4
-
4.4
-
4.4
-
V
-4
3
2.58
-
2.48
-
2.4
-
V
-24
4.5
3.94
-
3.8
-
3.7
-
V
-75
(Note 6, 7)
5.5
-
-
3.85
-
-
-
V
-50
(Note 6, 7)
5.5
-
-
-
-
3.85
-
V
CD74AC251, CD74ACT251
4
Low Level Output Voltage
V
OL
V
IH
or V
IL
0.05
1.5
-
0.1
-
0.1
-
0.1
V
0.05
3
-
0.1
-
0.1
-
0.1
V
0.05
4.5
-
0.1
-
0.1
-
0.1
V
12
3
-
0.36
-
0.44
-
0.5
V
24
4.5
-
0.36
-
0.44
-
0.5
V
75
(Note 6, 7)
5.5
-
-
-
1.65
-
-
V
50
(Note 6, 7)
5.5
-
-
-
-
-
1.65
V
Input Leakage Current
I
I
V
CC
or
GND
-
5.5
-
0.1
-
1
-
1
A
Three-State Leakage
Current
I
OZ
V
IH
or V
IL
V
O
= V
CC
or GND
-
5.5
-
0.5
-
5
-
10
A
Quiescent Supply Current
MSI
I
CC
V
CC
or
GND
0
5.5
-
8
-
80
-
160
A
ACT TYPES
High Level Input Voltage
V
IH
-
-
4.5 to
5.5
2
-
2
-
2
-
V
Low Level Input Voltage
V
IL
-
-
4.5 to
5.5
-
0.8
-
0.8
-
0.8
V
High Level Output Voltage
V
OH
V
IH
or V
IL
-0.05
4.5
4.4
-
4.4
-
4.4
-
V
-24
4.5
3.94
-
3.8
-
3.7
-
V
-75
(Note 6, 7)
5.5
-
-
3.85
-
-
-
V
-50
(Note 6, 7)
5.5
-
-
-
-
3.85
-
V
Low Level Output Voltage
V
OL
V
IH
or V
IL
0.05
4.5
-
0.1
-
0.1
-
0.1
V
24
4.5
-
0.36
-
0.44
-
0.5
V
75
(Note 6, 7)
5.5
-
-
-
1.65
-
-
V
50
(Note 6, 7)
5.5
-
-
-
-
-
1.65
V
Input Leakage Current
I
I
V
CC
or
GND
-
5.5
-
0.1
-
1
-
1
A
Three-State or Leakage
Current
I
OZ
V
IH
or V
IL
V
O
= V
CC
or GND
-
5.5
-
0.5
-
5
-
10
A
Quiescent Supply Current
MSI
I
CC
V
CC
or
GND
0
5.5
-
8
-
80
-
160
A
Additional Supply Current per
Input Pin TTL Inputs High
1 Unit Load
I
CC
V
CC
-2.1
-
4.5 to
5.5
-
2.4
-
2.8
-
3
mA
NOTES:
6. Test one output at a time for a 1-second maximum duration. Measurement is made by forcing current and measuring voltage to minimize
power dissipation.
7. Test verifies a minimum 50
transmission-line-drive capability at 85
o
C, 75
at 125
o
C.
DC Electrical Specifications
(Continued)
PARAMETER
SYMBOL
TEST
CONDITIONS
V
CC
(V)
25
o
C
-40
o
C TO
85
o
C
-55
o
C TO
125
o
C
UNITS
V
I
(V)
I
O
(mA)
MIN
MAX
MIN
MAX
MIN
MAX
CD74AC251, CD74ACT251
5
ACT Input Load Table
INPUT
UNIT LOAD
S0, S1, S3
1
OE
1
I
0
- I
7
1
NOTE: Unit load is
I
CC
limit specified in DC Electrical Specifications
Table, e.g., 2.4mA max at 25
o
C.
Switching Specifications
Input t
r
, t
f
= 3ns, C
L
= 50pF (Worst Case)
PARAMETER
SYMBOL
V
CC
(V)
-40
o
C TO 85
o
C
-55
o
C TO 125
o
C
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
AC TYPES
Propagation Delay,
Data to Y Output
t
PLH
, t
PHL
1.5
-
-
153
-
-
169
ns
3.3
(Note 9)
4.9
-
17.2
4.7
-
18.9
ns
5
(Note 10)
3.5
-
12.3
3.4
-
13.5
ns
Propagation Delay,
Data to Y Output
t
PLH
, t
PHL
1.5
-
-
169
-
-
186
ns
3.3
5.4
-
19
5.2
-
20.9
ns
5
3.8
-
13.5
3.7
-
14.9
ns
Propagation Delay,
Select to Y Output
t
PLH
, t
PHL
1.5
-
-
207
-
-
228
ns
3.3
6.6
-
23.2
6.4
-
25.5
ns
5
4.7
-
16.5
4.6
-
18.2
ns
Propagation Delay,
Select to Y Output
t
PLH
, t
PHL
1.5
-
-
223
-
-
245
ns
3.3
7.1
-
24.9
6.9
-
27.4
ns
5
5.1
-
17.8
4.9
-
19.6
ns
Propagation Delay,
Output Enable and Output
Disable to Output
t
PZH
, t
PZL
,
t
PHZ
, t
PLZ
1.5
-
-
155
-
-
169
ns
3.3
5.2
-
18.7
5.1
-
20.3
ns
5
3.5
-
12.3
3.4
-
13.5
ns
Three-State Output
Capacitance
C
O
-
-
-
15
-
-
15
pF
Input Capacitance
C
I
-
-
-
10
-
-
10
pF
Power Dissipation Capacitance
C
PD
(Note 11)
-
-
120
-
-
120
-
pF
ACT TYPES
Propagation Delay,
Data to Y Output
t
PLH
, t
PHL
5
(Note 10)
3.5
-
12.3
3.4
-
13.5
ns
Propagation Delay,
Data to Y Output
t
PLH
, t
PHL
5
3.8
-
13.5
3.7
-
14.9
ns
Propagation Delay,
Select to Y Output
t
PLH
, t
PHL
5
4.7
-
16.5
4.6
-
18.2
ns
Propagation Delay,
Select to Y Output
t
PLH
, t
PHL
5
5.1
-
17.8
4.9
-
19.6
ns
Propagation Delay,
Output Enable and Output
Disable to Output
t
PZH
, t
PZL
,
t
PHZ
, t
PLZ
5
3.5
-
12.3
3.4
-
13.5
ns
CD74AC251, CD74ACT251