N74F251AD [NXP]
8-input multiplexer 3-State; 8输入多路复用器三态
| 型号： | N74F251AD |
| 厂家： | 
NXP |
| 描述： | 8-input multiplexer 3-State |
| 文件： | 总5页 (文件大小：48K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74F251A
FEATURES
PIN CONFIGURATION
• High speed 8-to-1 multiplexing
I3
I2
I1
I0
Y
1
2
3
4
5
16
V
• On chip decoding
CC
15 I4
14 I5
13 I6
12 I7
11 S0
10 S1
• Multifunction capability
• Inverting and Non-Inverting outputs
• Both outputs are 3-State for further multiplexer expansion
Y
OE
6
7
8
DESCRIPTION
The 74F251A is a logic implementation of a single 8-position switch
with the switch position controlled by the state of three Select (S0,
S1, S2) inputs. True (Y) and complementary (Y) outputs are both
provided. The output enable (OE) is active Low. When OE is High,
both outputs are in High impedance state, allowing multiple output
connections to a common bus without driving nor loading the bus
significantly. All but one device must be in High impedance state to
avoid high currents that would exceed the maximum ratings when
the outputs of the 3-State devices are tied together. When the output
of more than one device is tied together the user must ensure that
there is no overlap in the active Low portion of the output enable
voltages.
GND
9
S2
SF00778
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
TYPE
74F251A
4.5ns
19mA
ORDERING INFORMATION
ORDER CODE
PKG
DWG #
COMMERCIAL RANGE
DESCRIPTION
V
CC
= 5V ±10%,
T
amb
= 0°C to +70°C
16-pin plastic DIP
16-pin plastic SO
N74F251AN
N74F251AD
SOT38-4
SOT162-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
I0–I7
S0–S2
OE
DESCRIPTION
74F (U.L.) HIGH/LOW
1.0/1.0
LOAD VALUE HIGH/LOW
Data inputs
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
3mA/24mA
Select inputs
1.0/1.0
Output Enable input (active Low)
Data outputs
1.0/1.0
Y, Y
150/40
NOTE:
One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
IEC/IEEE SYMBOL
4
3
2
1
15 14 13 12
MUX
7
EN
0
11
10
9
0
7
G
5
6
I0
I1
I2
I3
I4
I5
I6
I7
2
4
11
10
S0
3
S1
S2
OE
2
9
7
1
Y
5
Y
15
14
13
12
V
= Pin 16
GND = Pin 8
CC
6
SF00779
SF00780
1
1996 Jan 05
853–0358 16191
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74F251A
LOGIC DIAGRAM
I0
I1
I2
I3
I4
I5
14
I6
I7
12
4
3
2
1
15
13
11
S0
10
S1
9
S2
7
OE
5
6
V
= Pin 16
Y
Y
CC
GND = Pin 8
SF00781
FUNCTION TABLE
INPUTS
OUTPUTS
S2
X
L
S1
X
L
S0
X
L
OE
H
L
Y
Y
Z
Z
I0
I1
I2
I3
I4
I5
I6
I7
I0
I1
I2
I3
I4
I5
I6
I7
L
L
H
L
L
L
H
H
L
L
L
H
L
L
H
H
H
L
L
H
L
L
H
H
L
H
H
L
NOTES:
H = High voltage level
L
X
Z
=
=
=
Low voltage level
Don’t care
High impedance “off” state
2
1996 Jan 05
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74F251A
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free air temperature range.)
SYMBOL
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
UNIT
V
V
Supply voltage
Input voltage
Input current
CC
IN
V
V
I
mA
V
IN
V
OUT
OUT
Voltage applied to output in High output state
Current applied to output in Low output state
Operating free-air temperature range
Storage temperature
–0.5 to V
CC
I
48
mA
°C
°C
T
amb
0 to +70
T
stg
–65 to +150
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
PARAMETER
UNIT
MIN
4.5
NOM
MAX
V
Supply voltage
5.0
5.5
V
V
CC
IH
IL
V
V
High-level input voltage
Low-level input voltage
Input clamp current
2.0
0.8
–18
–3
V
I
I
I
mA
mA
mA
°C
IK
High-level output current
Low-level output current
OH
OL
24
T
amb
Operating free-air temperature range
0
70
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
1
SYMBOL
PARAMETER
TEST CONDITIONS
UNIT
2
MIN
2.4
TYP
MAX
V
V
V
V
V
±10%V
±5%V
CC
V
V
= MIN, V = MAX,
CC
IH
IL
V
OH
High-level output voltage
= MIN, I = MAX
OH
2.7
3.3
CC
0.35
0.35
0.50
0.50
–1.2
±10%V
CC
CC
V
V
= MIN, V = MAX,
IL
= MIN, I = MAX
CC
IH
V
V
Low-level output voltage
Input clamp voltage
OL
OL
±5%V
V
CC
V
CC
= MIN, I = I
IK
–0.73
IK
I
Input current at maximum input
voltage
I
I
= MAX, V = 7.0V
100
µA
I
I
I
High-level input current
Low-level input current
V
V
= MAX, V = 2.7V
20
µA
IH
CC
I
= MAX, V = 0.5V
–0.6
mA
IL
CC
I
Off-state output current
High-level voltage applied
I
V
CC
= MAX, V = 2.7V
50
µA
OZH
I
Off-state output current
Low-level voltage applied
I
I
V
V
= MAX, V = 0.5V
–50
mA
OZL
CC
I
3
Short-circuit output current
= MAX
–60
–150
27
mA
mA
mA
mA
OS
CC
I
I
I
20
17
21
CCH
CCL
CCZ
24
I
Supply current (total)
V
CC
= MAX
CC
29
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V = 5V, T = 25°C.
CC
amb
3. Not more than one output should be shorted at a time. For testing I , the use of high-speed test apparatus and/or sample-and-hold
OS
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I tests should be performed last.
OS
3
1996 Jan 05
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74F251A
AC ELECTRICAL CHARACTERISTICS
LIMITS
V
amb
= +5V
= +25°C
V
amb
= +5V ± 10%
= 0°C to +70°C
CC
CC
TEST
T
T
SYMBOL
PARAMETER
UNIT
CONDITION
C = 50pF
L
C = 50pF
L
R = 500Ω
L
R = 500Ω
L
MIN
TYP
MAX
MIN
MAX
t
t
Propagation delay
In to Y
3.0
3.0
5.0
5.0
7.0
7.0
2.5
3.0
8.0
8.0
PLH
PHL
Waveform 2
Waveform 1
ns
ns
ns
ns
ns
ns
ns
ns
t
t
Propagation delay
In to Y
2.5
1.0
4.5
2.5
7.0
5.0
2.0
1.0
7.5
5.0
PLH
PHL
t
t
Propagation delay
Sn to Y
Waveform 1
Waveform 2
4.5
4.0
6.5
5.5
10.0
9.0
4.0
3.5
11.5
9.5
PLH
PHL
t
t
Propagation delay
Sn to Y
Waveform 1
Waveform 2
3.5
2.5
6.0
4.5
9.0
7.0
3.5
2.5
9.5
7.5
PLH
PHL
t
t
Output Enable time OE
to Y
Waveform 3
Waveform 4
3.5
3.5
5.5
5.0
7.5
7.5
3.0
3.0
8.5
8.0
PZH
PZL
t
t
Output Disable time
OE to Y
Waveform 3
Waveform 4
2.5
1.0
4.0
4.0
6.5
6.0
2.0
1.0
7.0
6.5
PHZ
PLZ
t
t
Output Enable time
OE to Y
Waveform 3
Waveform 4
2.5
2.5
4.0
4.0
6.5
6.5
2.0
2.5
7.0
7.0
PZH
PZL
t
t
Output Disable time
OE to Y
Waveform 3
Waveform 4
3.5
1.0
5.0
2.0
7.5
4.5
3.0
1.0
8.0
4.5
PHZ
PLZ
AC WAVEFORMS
For all waveforms, V = 1.5V
M
V
IN
V
V
IN
V
M
V
M
M
V
M
t
t
PHL
PLH
t
t
PLH
PHL
V
V
M
M
V
V
V
M
OUT
M
V
OUT
SF00782
SF00092
Waveform 1. For Inverting Outputs
Waveform 2. For Non-Inverting Outputs
V
V
V
V
M
OE
OE
M
M
M
t
t
t
t
PLZ
PZH
PHZ
PZL
V
–0.3V
0V
OH
V
M
Y, Y
Y, Y
V
M
V
+0.3V
OL
SF00784
SF00785
Waveform 3. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
Waveform 4. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
4
1996 Jan 05
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74F251A
TEST CIRCUIT AND WAVEFORMS
V
CC
t
w
AMP (V)
90%
7.0V
90%
NEGATIVE
PULSE
V
V
M
R
M
L
V
V
OUT
IN
10%
10%
PULSE
GENERATOR
D.U.T.
0V
t
t )
t
t )
THL ( f
TLH ( r
R
C
R
L
T
L
t
t )
t
t )
TLH ( r
THL ( f
AMP (V)
90%
M
90%
POSITIVE
PULSE
V
V
M
Test Circuit for 3-State Outputs
10%
10%
0V
t
w
SWITCH POSITION
TEST
SWITCH
closed
closed
open
Input Pulse Definition
t
t
PLZ
PZL
All other
DEFINITIONS:
R
L
C
L
R
T
=
=
=
Load resistor;
see AC electrical characteristics for value.
Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
Termination resistance should be equal to Z
pulse generators.
INPUT PULSE REQUIREMENTS
family
V
M
rep. rate
t
t
t
amplitude
w
TLH
THL
of
OUT
2.5ns
2.5ns
74F
3.0V
1.5V
1MHz
500ns
SF00777
5
1996 Jan 05
相关型号：
N74F251AD-T
IC F/FAST SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDSO16, Multiplexer/Demultiplexer
NXP
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