74ACT251LCQR [TI]
ACT SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, CQCC20, CERAMIC, LCC-20;
| 型号： | 74ACT251LCQR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | ACT SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, CQCC20, CERAMIC, LCC-20 输出元件 |
| 文件： | 总8页 (文件大小：172K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
February 1993
54AC/74AC251 54ACT/74ACT251
#
8-Input Multiplexer with TRI-STATE Output
É
General Description
Features
Y
CC
I
reduced by 50%
The ’AC/’ACT251 is a high-speed 8-input digital multiplexer.
It provides, in one package, the ability to select one bit of
data from up to eight sources. It can be used as universal
function generator to generate any logic function of four
variables. Both true and complementary outputs are provid-
ed.
Y
Y
Y
Y
Y
Y
Multifunctional capability
On-chip select logic decoding
Inverting and noninverting TRI-STATE outputs
Outputs source/sink 24 mA
’ACT251 has TTL-compatible inputs
Standard Military Drawing (SMD)
Ð ’AC251: 5962-87692
Ð ’ACT251: 5962-89599
Logic Symbols
Connection Diagrams
Pin Assignment
for DIP, Flatpak and SOIC
IEEE/IEC
TL/F/9945–1
TL/F/9945–3
Pin Assignment
for LCC
TL/F/9945–2
Pin Names
Description
S –S
0
Select Inputs
2
OE
TRI-STATE Output Enable Input
Multiplexer Inputs
I –I
0
7
Z
Z
TRI-STATE Multiplexer Output
Complementary TRI-STATE Multiplexer
Output
TL/F/9945–4
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
FACTTM is a trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/F/9945
RRD-B30M75/Printed in U. S. A.
Functional Description
Truth Table
This device is a logical implementation of a single-pole,
8-position switch with the switch position controlled by the
state of three Select inputs, S , S , S . Both true and com-
Inputs
Outputs
OE
S
2
S
1
S
0
Z
Z
0
1
2
plementary outputs are provided. The Output Enable input
(OE) is active LOW. When it is activated, the logic function
provided at the output is:
H
L
L
L
L
L
L
L
L
X
X
X
Z
Z
L
L
L
L
L
H
L
I
0
I
1
I
2
I
3
I
4
I
5
I
6
I
7
I
I
I
I
I
I
I
I
0
1
2
3
4
5
6
7
e
a
a
S
2
a
S
2
a
S
2
Z
OE (I
#
S
S
S
I
S
S
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
#
0
0
1
2
1
0
1
L
H
H
L
a
I
S
0
S
1
S
2
I
I
I
S
0
S
1
2
3
5
7
L
H
L
a
a
I
I
S
S
S
S
S
S
S
S
S
S
4
0
1
2
0
1
H
H
H
H
S )
2
6
0
1
2
0
1
L
H
L
When the Output Enable is HIGH, both outputs are in the
high impedance (High Z) state. This feature allows multi-
plexer expansion by tying the outputs of up to 128 devices
together. When the outputs of the TRI-STATE devices are
tied together, all but one device must be in the high imped-
ance state to avoid high currents that would exceed the
maximum ratings. The Output Enable signals should be de-
signed to ensure there is no overlap in the active-LOW por-
tion of the enable voltages.
H
H
H
e
e
e
e
H
L
HIGH Voltage Level
LOW Voltage Level
Immaterial
X
Z
High Impedance
Logic Diagram
TL/F/9945–5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Recommended Operating
Conditions
Supply Voltage (V
’AC
’ACT
)
CC
2.0V to 6.0V
4.5V to 5.5V
b
a
0.5V to 7.0V
Supply Voltage (V
)
CC
DC Input Diode Current (I
)
IK
Input Voltage (V )
I
0V to V
0V to V
CC
e b
b
a
V
I
V
I
0.5V
a
20 mA
20 mA
Output Voltage (V
)
O
CC
e
V
CC
0.5V
Operating Temperature (T )
A
74AC/ACT
54AC/ACT
b
b
a
0.5V
DC Input Voltage (V )
I
0.5V to V
0.5V to V
CC
b
b
a
40 C to 85 C
§
55 C to 125 C
§
§
DC Output Diode Current (I
)
a
OK
§
e b
b
a
V
V
0.5V
a
20 mA
20 mA
O
O
Minimum Input Edge Rate (DV/Dt)
’AC Devices
e
V
CC
0.5V
a
DC Output Voltage (V
DC Output Source
)
O
0.5V
50 mA
50 mA
CC
V
V
from 30% to 70% of V
@
IN
CC
3.3V, 4.5V, 5.5V
125 mV/ns
125 mV/ns
CC
g
g
or Sink Current (I
)
O
Minimum Input Edge Rate (DV/Dt)
’ACT Devices
DC V
or Ground Current
CC
per Output Pin (I or I
CC
)
V
V
from 0.8V to 2.0V
@
GND
)
IN
4.5V, 5.5V
b
a
65 C to 150 C
CC
Storage Temperature (T
§
§
STG
Junction Temperature (T )
J
CDIP
PDIP
175 C
§
140 C
§
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. National does not recom-
mend operation of FACTTM circuits outside databook specifications.
DC Characteristics for ’AC Family Devices
74AC
54AC
74AC
e
e
T
A
V
T
CC
A
e a
Symbol
Parameter
T
25 C
§
Units
Conditions
A
b
a
55 C to 125 C
b a
40 C to 85 C
(V)
§
§
§
§
Typ
Guaranteed Limits
e
0.1V
V
V
V
Minimum High Level
Input Voltage
3.0
4.5
5.5
1.5
2.1
2.1
2.1
V
IH
OUT
b
2.25
2.75
3.15
3.85
3.15
3.85
3.15
3.85
V
V
V
or V
CC
0.1V
e
Maximum Low Level
Input Voltage
3.0
4.5
5.5
1.5
0.9
0.9
0.9
V
OUT
0.1V
IL
b
2.25
2.75
1.35
1.65
1.35
1.65
1.35
1.65
or V
CC
0.1V
e b
OUT
Minimum High Level
Output Voltage
3.0
4.5
5.5
2.99
4.49
5.49
2.9
4.4
5.4
2.9
4.4
5.4
2.9
4.4
5.4
I
50 mA
OH
e
*V
IN
V
IL
or V
IH
b
b
b
3.0
4.5
5.5
2.56
3.86
4.86
2.4
3.7
4.7
2.46
3.76
4.76
12 mA
V
V
I
24 mA
24 mA
OH
e
e
V
OL
Maximum Low Level
Output Voltage
3.0
4.5
5.5
0.002
0.001
0.001
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
I
50 mA
OUT
*V
IN
V or V
IL IH
3.0
4.5
5.5
0.36
0.36
0.36
0.50
0.50
0.50
0.44
0.44
0.44
12 mA
V
I
24 mA
24 mA
OL
e
I
Maximum Input
Leakage Current
V
I
V , GND
CC
IN
g
g
g
1.0
5.5
0.1
1.0
mA
*All outputs loaded; thresholds on input associated with output under test.
3
DC Characteristics for ’AC Family Devices (Continued)
74AC
54AC
74AC
e
25 C
e
e
T
A
V
T
T
CC
A
A
Symbol
Parameter
Units
Conditions
a
b
a
55 C to 125 C
b a
40 C to 85 C
(V)
§
§
§
§
§
Typ
Guaranteed Limits
e
I
Maximum TRI-STATE
Current
V (OE)
I
V
, V
IL IH
É
OZ
e
g
g
g
5.0
5.5
0.5
10.0
mA
V
V
V
, V
CC GND
I
e
V
CC
, GND
O
e
e
²
I
I
I
Minimum Dynamic
5.5
5.5
50
75
mA
mA
V
V
V
1.65V Max
3.85V Min
OLD
OHD
CC
OLD
OHD
Output Current
b
b
75
50
e
Maximum Quiescent
Supply Current
V
CC
IN
5.5
4.0
80.0
40.0
mA
or GND
²
Maximum test duration 2.0 ms, one output loaded at a time.
@
@
3.0V are guaranteed to be less than or equal to the respective limit 5.5V V
Note:
I
I
and I
.
CC
IN
CC
@
@
for 54AC 25 C is identical to 74AC 25 C.
§
§
CC
DC Characteristics for ’ACT Family Devices
74ACT
54ACT
74ACT
e
25 C
e
e
T
A
V
T
T
CC
A
A
Symbol
Parameter
Units
Conditions
a
b
a
55 C to 125 C
b a
40 C to 85 C
(V)
§
§
§
§
§
Typ
Guaranteed Limits
e
0.1V
V
V
V
Minimum High Level
Input Voltage
4.5
5.5
1.5
1.5
2.0
2.0
2.0
2.0
2.0
V
IH
OUT
V
V
V
b
2.0
or V
CC
0.1V
e
Maximum Low Level
Input Voltage
4.5
5.5
1.5
1.5
0.8
0.8
0.8
0.8
0.8
0.8
V
OUT
0.1V
IL
b
or V
CC
0.1V
e b
OUT
Minimum High Level
Output Voltage
4.5
5.5
4.49
5.49
4.4
5.4
4.4
5.4
4.4
5.4
I
50 mA
OH
e
*V
IN
V
IL
or V
IH
b
b
4.5
5.5
3.86
4.86
3.70
4.70
3.76
4.76
24 mA
24 mA
V
V
I
OH
e
e
V
OL
Maximum Low Level
Output Voltage
4.5
5.5
0.001
0.001
0.1
0.1
0.1
0.1
0.1
0.1
I
50 mA
OUT
*V
IN
V
or V
IL IH
4.5
5.5
0.36
0.36
0.50
0.50
0.44
0.44
24 mA
V
I
OL
24 mA
I
I
I
Maximum Input
Leakage Current
IN
e
e
g
g
g
g
g
5.5
5.5
5.5
0.1
0.5
1.0
1.0
5.0
mA
mA
mA
V
V
, GND
CC
I
Maximum TRI-STATE
Current
V
V
V , V
IL IH
É
OZ
I
g
10.0
e
V
, GND
CC
O
e
b
2.1V
Maximum
V
I
V
CC
CCT
0.6
1.6
50
1.5
75
I
/Input
CC
e
²
I
I
I
Minimum Dynamic
5.5
5.5
mA
mA
V
V
V
1.65V Max
e
3.85V Min
OLD
OHD
CC
OLD
Output Current
b
b
50
75
OHD
e
Maximum Quiescent
Supply Current
V
CC
IN
5.5
4.0
80.0
40.0
mA
or GND
*All outputs loaded; thresholds on input associated with output under test.
²
Maximum test duration 2.0 ms, one output loaded at a time.
@ @
for 54ACT 25 C is identical to 74ACT 25 C.
§ §
Note: I
CC
4
AC Electrical Characteristics
74AC
54AC
e b
74AC
e b
T
55 C
T
40 C
§
§
A
A
e a
A
V *
CC
(V)
T
25 C
§
50 pF
a
a
Symbol
Parameter
to 125 C
to 85 C
Units
§
50 pF
§
50 pF
e
C
L
e
e
C
C
L
L
Min
Typ
Max
Min
Max
Min
Max
t
t
t
t
t
t
t
t
Propagation Delay
3.3
5.0
1.5
1.5
11.5
8.5
17.5
12.5
1.0
1.0
21.0
15.5
1.5
1.5
19.0
13.5
PLH
PHL
PLH
PHL
PZH
PZL
PHZ
PLZ
ns
ns
ns
ns
ns
ns
ns
ns
S
n
to Z or Z
Propagation Delay
to Z or Z
3.3
5.0
1.5
1.5
11.0
8.0
17.5
12.5
1.0
1.0
21.0
15.5
1.5
1.5
19.0
13.5
S
n
Propagation Delay
to Z or Z
3.3
5.0
1.5
1.5
10.0
7.0
14.0
10.0
1.0
1.0
17.0
12.0
1.5
1.5
15.5
11.0
I
n
Propagation Delay
to Z or Z
3.3
5.0
1.5
1.5
9.0
6.5
14.0
10.0
1.0
1.0
16.5
12.0
1.5
1.5
15.5
11.0
I
n
Output Enable Time
OE to Z or Z
3.3
5.0
1.5
1.5
7.5
5.5
11.0
8.0
1.0
1.0
13.0
10.0
1.5
1.5
12.0
9.0
Output Enable Time
OE to Z or Z
3.3
5.0
1.5
1.5
7.5
5.5
11.0
8.0
1.0
1.0
13.0
10.0
1.5
1.5
12.0
9.0
Output Disable Time
OE to Z or Z
3.3
5.0
1.5
1.5
8.5
7.0
11.5
9.5
3.5
2.5
14.0
11.0
1.5
1.5
13.0
10.0
Output Disable Time
OE to Z or Z
3.3
5.0
1.5
1.5
7.0
5.5
11.0
8.0
4.0
3.0
13.0
10.0
1.5
1.5
12.0
8.5
g
*Voltage Range 3.3 is 3.3V 0.3V
g
Voltage Range 5.0 is 5.0V 0.5V
AC Electrical Characteristics
74ACT
54ACT
74ACT
e b
e b
T
A
55 C
T
A
40 C
§
to 125 C
§
to 85 C
e a
A
V *
CC
(V)
T
25 C
§
50 pF
a
a
Symbol
Parameter
Units
§
50 pF
§
50 pF
e
C
L
e
e
C
C
L
L
Min
Typ
Max
Min
Max
Min
Max
t
t
t
t
t
t
t
t
Propagation Delay
PLH
PHL
PLH
PHL
PZH
PZL
PHZ
PLZ
5.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
2.5
7.0
7.5
5.5
6.5
5.0
4.5
6.0
4.5
15.5
1.0
18.5
19.5
14.0
15.0
10.0
10.0
13.5
9.5
2.0
17.0
18.5
13.0
14.0
9.0
ns
ns
ns
ns
ns
ns
ns
ns
S
n
to Z or Z
Propagation Delay
to Z or Z
2.5
2.5
2.5
1.5
1.5
2.0
1.5
16.5
12.0
12.5
8.5
1.0
1.0
1.0
1.0
1.0
1.0
1.0
2.5
2.0
2.5
1.5
1.5
2.0
1.5
S
n
Propagation Delay
to Z or Z
I
n
Propagation Delay
to Z or Z
I
n
Output Enable Time
OE to Z or Z
Output Enable Time
OE to Z or Z
8.5
9.5
Output Disable Time
OE to Z or Z
12.0
8.5
13.0
9.0
Output Disable Time
OE to Z or Z
g
*Voltage Range 5.0 is 5.0V 0.5V
5
Capacitance
Symbol
Parameter
Typ
Units
Conditions
e
e
C
C
Input Capacitance
4.5
pF
V
V
OPEN
5.0V
IN
CC
Power Dissipation
Capacitance
PD
CC
70.0
pF
Ordering Information
The device number is used to form part of a simplified purchasing code where the package type and temperature range are
defined as follows:
74AC 251
P
C
QR
Temperature Range Family
e
Special Variations
e
e
74AC
54AC
Commercial
Military
X
QR
Devices shipped in 13 reels
×
Commercial grade device
with burn-in
e
e
e
74ACT
54ACT
Commercial TTL-Compatible
Military TTL-Compatible
e
QB
Military grade device with
environmental and burn-in
processing shipped in tubes
Device Type
Package Code
Temperature Range
e
e
e
e
e
P
D
F
L
Plastic DIP
Ceramic DIP
Flatpak
Leadless Ceramic Chip Carrier (LCC)
Small Outline (SOIC)
e
e
b a
C
M
Commercial ( 40 C to 85 C)
§
§
b a
Military ( 55 C to 125 C)
§
§
S
Physical Dimensions inches (millimeters)
20 Terminal Ceramic Leadless Chip Carrier (L)
NS Package Number E20A
6
Physical Dimensions inches (millimeters) (Continued)
16 Lead Ceramic Dual-In-Line Package (D)
NS Package Number J16A
16 Lead Small Outline Integrated Circuit (S)
NS Package Number M16A
7
Physical Dimensions inches (millimeters) (Continued)
16 Lead Plastic Dual-In-Line Package (P)
NS Package Number N16E
16 Lead Ceramic Flatpak (F)
NS Package Number W16A
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failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
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