MC74ACT257MR1 [ONSEMI]
IC,LOGIC MUX,QUAD,2-INPUT,ACT-CMOS,SOP,16PIN,PLASTIC;
| 型号： | MC74ACT257MR1 |
| 厂家： | 
ONSEMI |
| 描述： | IC,LOGIC MUX,QUAD,2-INPUT,ACT-CMOS,SOP,16PIN,PLASTIC 输入元件 光电二极管 逻辑集成电路 |
| 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 |
QUAD 2-INPUT
MULTIPLEXER WITH
3-STATE OUTPUTS
The MC74AC257/74ACT257 is a quad 2-input multiplexer with 3-state outputs.
Four bits of data from two sources can be selected using a Common Data Select
input. The four outputs present the selected data in true (noninverted) form. The
outputs may be switched to a high impedance state by placing a logic HIGH on
the common Output Enable (OE) input, allowing the outputs to interface directly
with bus-oriented systems.
• Multiplexer Expansion by Tying Outputs Together
• Noninverting 3-State Outputs
• Outputs Source/Sink 24 mA
• ′ACT257 Has TTL Compatible Inputs
N SUFFIX
CASE 648-08
PLASTIC
V
OE
15
I
I
Z
I
I
Z
d
CC
0c
14
1c
13
c
0d
11
1d
10
16
12
9
PIN NAMES
D SUFFIX
CASE 751B-05
PLASTIC
S
OE
Common Data Select Input
3-State Output Enable Input
Data Inputs from Source 0
Data Inputs from Source 1
3-State Multiplexer Outputs
I
I
–I
0a 0d
1
2
3
4
5
6
7
8
–I
1a 1d
Z –Z
S
I
I
Z
a
I
I
Z
b
GND
a
d
0a
1a
0b
1b
LOGIC SYMBOL
TRUTH TABLE
Output
Enable
Select
Input
Data
Inputs
Outputs
OE I
I
I
I
I
I
I
I
0a 1a 0b 1b 0c 1c 0d 1d
OE
S
I
0
I
1
Z
S
H
L
L
L
L
X
H
H
L
X
X
X
L
X
L
H
X
X
Z
L
H
L
Z
Z
Z
Z
d
a
b
c
L
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
FACT DATA
5-1
MC74AC257 MC74ACT257
FUNCTIONAL DESCRIPTION
The MC74AC257/74ACT257 is a quad 2-input multiplexer
with 3-state outputs. It selects four bits of data from two
sources under control of a Common Data Select input. When
When the Output Enable input (OE) is HIGH, the outputs
are forced to a high impedance state. If the outputs are tied
together, all but one device must be in the high impedance
state to avoid high currents that would exceed the maximum
ratings. Designers should ensure the Output Enable signals to
3-state devices whose outputs are tied together are designed
so there is no overlap.
the Select input is LOW, the I inputs are selected and when
0x
Select is HIGH, the I inputs are selected. The data on the
1x
selected inputs appears at the outputs in true (noninverted)
form. The device is the logic implementation of a 4-pole,
2-position switch where the position of the switch is
determinedbythelogiclevelssuppliedtotheSelectinput. The
logic equations for the outputs are shown below:
Z = OE•(I
a
1a•S+I0a•S)
1b•S+I0b•S)
1c•S+I0c•S)
1d•S+I0d•S)
Z = OE•(I
b
Z = OE•(I
c
Z = OE•(I
d
LOGIC DIAGRAM
OE
I
I
I
I
I
I
I
I
1d
S
0a
1a
0b
1b
0c
1c
0d
Z
Z
Z
Z
d
a
b
c
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
FACT DATA
5-2
MC74AC257 MC74ACT257
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
V
V
V
DC Supply Voltage (Referenced to GND)
–0.5 to +7.0
CC
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
–0.5 to V
+0.5
V
in
CC
V
out
–0.5 to V
+0.5
V
CC
I
I
I
±20
mA
mA
mA
°C
in
DC Output Sink/Source Current, per Pin
±50
±50
out
CC
DC V
or GND Current per Output Pin
Storage Temperature
CC
T
stg
–65 to +150
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended
Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
2.0
4.5
0
Typ
5.0
5.0
Max
6.0
Unit
V
′AC
V
Supply Voltage
CC
′ACT
5.5
V , V
in out
DC Input Voltage, Output Voltage (Ref. to GND)
V
CC
V
V
CC
V
CC
V
CC
V
CC
V
CC
@ 3.0 V
@ 4.5 V
@ 5.5 V
@ 4.5 V
@ 5.5 V
150
40
Input Rise and Fall Time (Note 1)
′AC Devices except Schmitt Inputs
ns/V
t , t
r f
25
10
Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs
t , t
r f
ns/V
8.0
T
Junction Temperature (PDIP)
Operating Ambient Temperature Range
Output Current — High
140
85
°C
°C
J
T
A
–40
25
I
I
–24
24
mA
mA
OH
Output Current — Low
OL
1. V from 30% to 70% V ; see individual Data Sheets for devices that differ from the typical input rise and fall times.
in
CC
2. V from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.
in
FACT DATA
5-3
MC74AC257 MC74ACT257
DC CHARACTERISTICS
Symbol
74AC
= +25°C
74AC
T
A
=
V
(V)
CC
Parameter
Unit
Conditions
T
A
–40°C to +85°C
Typ
Guaranteed Limits
V
V
V
3.0
4.5
5.5
1.5
2.25
2.75
2.1
3.15
3.85
2.1
3.15
3.85
V
= 0.1 V
– 0.1 V
Minimum High Level
Input Voltage
IH
OUT
V
V
V
or V
CC
= 0.1 V
OUT
3.0
4.5
5.5
1.5
2.25
2.75
0.9
1.35
1.65
0.9
1.35
1.65
V
Maximum Low Level
Input Voltage
IL
or V
– 0.1 V
CC
3.0
4.5
5.5
2.99
4.49
5.49
2.9
4.4
5.4
2.9
4.4
5.4
I
= –50 µA
Minimum High Level
Output Voltage
OH
OUT
*V = V or V
IN IL IH
3.0
4.5
5.5
2.56
3.86
4.86
2.46
3.76
4.76
–12 mA
–24 mA
–24 mA
V
V
V
I
OH
V
OL
3.0
4.5
5.5
0.002
0.001
0.001
0.1
0.1
0.1
0.1
0.1
0.1
I = 50 µA
OUT
Maximum Low Level
Output Voltage
*V = V or V
IN IL
IH
3.0
4.5
5.5
0.36
0.36
0.36
0.44
0.44
0.44
12 mA
I
24 mA
24 mA
OL
I
IN
Maximum Input
Leakage Current
5.5
5.5
±0.1
±0.5
±1.0
±5.0
µA
µA
V = V , GND
CC
I
I
V (OE) = V , V
IL IH
Maximum
3-State
Current
OZ
I
V = V , GND
I
CC
= V , GND
CC
V
O
I
I
I
5.5
5.5
75
mA
mA
V
= 1.65 V Max
†Minimum Dynamic
Output Current
OLD
OHD
CC
OLD
OHD
–75
V
V
= 3.85 V Min
Maximum Quiescent
Supply Current
5.5
8.0
80
µA
= V or GND
CC
IN
* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
Note: I and I
@ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V V
.
IN CC
CC
FACT DATA
5-4
MC74AC257 MC74ACT257
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
74AC
74AC
T
= –40°C
A
T
C
= +25°C
= 50 pF
V
(V)
*
Fig.
No.
A
L
CC
Symbol
Parameter
to +85°C
C
Unit
= 50 pF
L
Min
Typ
Max
Min
Max
Propagation Delay
to Z
3.3
5.0
1.5
1.5
5.0
4.0
8.5
6.0
1.0
1.0
9.0
7.0
t
t
t
t
t
t
t
t
ns
ns
ns
ns
ns
ns
ns
ns
3-5
3-5
3-6
3-6
3-7
3-8
3-7
3-8
PLH
I
n
n
Propagation Delay
to Z
3.3
5.0
1.5
1.5
6.0
4.5
8.5
6.0
1.0
1.0
9.0
7.0
PHL
PLH
PHL
PZH
PZL
PHZ
PLZ
I
n
n
Propagation Delay
S to Z
3.3
5.0
1.5
1.5
7.0
5.0
10.5
7.5
1.5
1.0
11.5
8.5
n
Propagation Delay
S to Z
3.3
5.0
1.5
1.5
7.5
5.5
10.5
7.5
1.5
1.0
11.5
8.5
n
3.3
5.0
1.5
1.5
6.5
5.0
9.5
7.5
1.0
1.0
10.5
8.5
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
3.3
5.0
1.5
1.5
5.5
5.0
9.0
8.5
1.0
1.0
10.0
9.5
3.3
5.0
1.5
1.5
5.5
5.0
10.0
9.0
1.0
1.0
11.0
10.0
3.3
5.0
1.5
1.5
5.5
5.0
9.0
8.0
1.0
1.0
10.0
9.0
* Voltage Range 3.3 V is 3.3 V ±0.3 V.
Voltage Range 5.0 V is 5.0 V ±0.5 V.
FACT DATA
5-5
MC74AC257 MC74ACT257
DC CHARACTERISTICS
Symbol
74ACT
= +25°C
74ACT
T
A
=
V
(V)
CC
Parameter
Unit
Conditions
T
A
–40°C to +85°C
Typ
Guaranteed Limits
V
V
V
4.5
5.5
1.5
1.5
2.0
2.0
2.0
2.0
V
= 0.1 V
– 0.1 V
Minimum High Level
Input Voltage
IH
OUT
V
V
V
or V
CC
= 0.1 V
OUT
4.5
5.5
1.5
1.5
0.8
0.8
0.8
0.8
V
Maximum Low Level
Input Voltage
IL
or V
– 0.1 V
CC
4.5
5.5
4.49
5.49
4.4
5.4
4.4
5.4
I
= –50 µA
Minimum High Level
Output Voltage
OH
OUT
*V = V or V
IN IL IH
4.5
5.5
3.86
4.86
3.76
4.76
V
V
V
–24 mA
–24 mA
I
OH
V
OL
4.5
5.5
0.001
0.001
0.1
0.1
0.1
0.1
I = 50 µA
OUT
Maximum Low Level
Output Voltage
*V = V or V
IN IL
IH
4.5
5.5
0.36
0.36
0.44
0.44
24 mA
24 mA
I
OL
I
IN
Maximum Input
Leakage Current
5.5
5.5
±0.1
±1.0
µA
V = V , GND
I
CC
∆I
CCT
Additional Max. I /Input
CC
0.6
1.5
mA
V = V
– 2.1 V
I
CC
I
V (OE) = V , V
IL IH
Maximum
3-State
Current
OZ
I
5.5
±0.5
±5.0
µA
V = V , GND
I
CC
= V , GND
CC
V
O
I
I
I
5.5
5.5
75
mA
mA
V
= 1.65 V Max
†Minimum Dynamic
Output Current
OLD
OLD
OHD
–75
V
V
= 3.85 V Min
OHD
CC
Maximum Quiescent
Supply Current
5.5
8.0
80
µA
= V or GND
CC
IN
* All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.
FACT DATA
5-6
MC74AC257 MC74ACT257
AC CHARACTERISTICS (For Figures and Waveforms — See Section 3)
74ACT
74ACT
= –40°C
T
A
T
C
= +25°C
= 50 pF
V
(V)
*
Fig.
No.
A
CC
Symbol
Parameter
to +85°C
Unit
L
C
= 50 pF
L
Min
Typ
Max
Min
Max
Propagation Delay
to Z
t
t
t
t
5.0
5.0
5.0
5.0
1.5
5.0
7.0
1.0
7.5
8.5
ns
ns
ns
ns
3-6
3-6
3-6
3-6
PLH
I
n
n
Propagation Delay
to Z
2.0
2.0
2.5
6.0
7.0
7.0
7.5
9.5
1.5
1.5
2.0
PHL
PLH
PHL
I
n
n
Propagation Delay
S to Z
10.5
11.5
n
Propagation Delay
S to Z
10.5
n
t
t
t
t
Output Enable Time
Output Enable Time
Output Disable Time
Output Disable Time
5.0
5.0
5.0
5.0
2.0
2.0
2.5
2.0
6.0
6.0
6.5
6.0
8.0
8.0
9.0
7.5
1.5
1.5
1.5
1.5
9.0
9.0
ns
ns
ns
ns
3-7
3-8
3-7
3-8
PZH
PZL
PHZ
PLZ
10.0
8.5
* Voltage Range 5.0 V is 5.0 V ±0.5 V.
CAPACITANCE
Symbol
Value
Typ
Parameter
Unit
Test Conditions
C
C
Input Capacitance
Power Dissipation Capacitance
4.5
50
pF
pF
V
V
= 5.0 V
= 5.0 V
IN
CC
PD
CC
FACT DATA
5-7
MC74AC257 MC74ACT257
OUTLINE DIMENSIONS
N SUFFIX
PLASTIC DIP PACKAGE
NOTES:
CASE 648–08
ISSUE R
–A–
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
16
1
9
8
B
S
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
INCHES
MILLIMETERS
DIM
A
B
C
D
F
MIN
MAX
0.770
0.270
0.175
0.021
0.70
MIN
18.80
6.35
3.69
0.39
1.02
MAX
19.55
6.85
4.44
0.53
1.77
F
0.740
0.250
0.145
0.015
0.040
C
L
SEATING
PLANE
–T–
G
H
J
K
L
0.100 BSC
0.050 BSC
2.54 BSC
1.27 BSC
K
M
0.008
0.015
0.130
0.305
10
0.21
0.38
3.30
7.74
10
H
J
0.110
0.295
0
2.80
7.50
0
G
D 16 PL
M
S
0.020
0.040
0.51
1.01
M
M
0.25 (0.010)
T
A
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
–A–
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
16
1
9
8
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
–B–
P 8 PL
M
S
0.25 (0.010)
B
G
MILLIMETERS
INCHES
DIM
A
B
C
D
MIN
9.80
3.80
1.35
0.35
0.40
MAX
10.00
4.00
1.75
0.49
1.25
MIN
MAX
0.393
0.157
0.068
0.019
0.049
F
0.386
0.150
0.054
0.014
0.016
R X 45
K
C
F
G
J
K
M
P
R
1.27 BSC
0.050 BSC
–T–
SEATING
PLANE
0.19
0.10
0
0.25
0.25
7
0.008
0.004
0
0.009
0.009
7
J
M
D
16 PL
5.80
0.25
6.20
0.50
0.229
0.010
0.244
0.019
M
S
S
0.25 (0.010)
T
B
A
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MC74AC257/D
◊
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