74F251A 查看數據表（PDF） - Philips Electronics
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74F251A Datasheet PDF : 5 Pages
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Philips Semiconductors
8-input multiplexer (3-State)
Product specification
74F251A
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
TEST
CONDITION
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPZH
tPZL
tPHZ
tPLZ
Propagation delay
In to Y
Propagation delay
In to Y
Propagation delay
Sn to Y
Propagation delay
Sn to Y
Output Enable time OE
to Y
Output Disable time
OE to Y
Output Enable time
OE to Y
Output Disable time
OE to Y
AC WAVEFORMS
For all waveforms, VM = 1.5V
Waveform 2
Waveform 1
Waveform 1
Waveform 2
Waveform 1
Waveform 2
Waveform 3
Waveform 4
Waveform 3
Waveform 4
Waveform 3
Waveform 4
Waveform 3
Waveform 4
LIMITS
VCC = +5V
Tamb = +25°C
CL = 50pF
RL = 500Ω
MIN
TYP MAX
VCC = +5V ± 10%
Tamb = 0°C to +70°C
CL = 50pF
RL = 500Ω
MIN
MAX
3.0
5.0
7.0
2.5
8.0
3.0
5.0
7.0
3.0
8.0
2.5
4.5
7.0
2.0
7.5
1.0
2.5
5.0
1.0
5.0
4.5
6.5
10.0
4.0
11.5
4.0
5.5
9.0
3.5
9.5
3.5
6.0
9.0
3.5
9.5
2.5
4.5
7.0
2.5
7.5
3.5
5.5
7.5
3.0
8.5
3.5
5.0
7.5
3.0
8.0
2.5
4.0
6.5
2.0
7.0
1.0
4.0
6.0
1.0
6.5
2.5
4.0
6.5
2.0
7.0
2.5
4.0
6.5
2.5
7.0
3.5
5.0
7.5
3.0
8.0
1.0
2.0
4.5
1.0
4.5
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
VIN
VM
VM
tPHL
tPLH
VIN
VM
VM
tPLH
tPHL
VOUT
VM
VM
Waveform 1. For Inverting Outputs
SF00782
VOUT
VM
VM
SF00092
Waveform 2. For Non-Inverting Outputs
OE
Y, Y
VM
tPZH
VM
tPHZ
VM
VOH –0.3V
0V
SF00784
Waveform 3. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
OE
Y, Y
VM
tPZL
VM
tPLZ
VM
VOL +0.3V
SF00785
Waveform 4. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
1996 Jan 05
4
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