74ALS251D 查看數據表（PDF） - Philips Electronics
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74ALS251D Datasheet PDF : 8 Pages
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Philips Semiconductors
8-input multiplexer (3-State)
Product specification
74ALS251
AC WAVEFORMS
For all waveforms, VM = 1.3V.
VIN
VM
VM
tPHL
tPLH
VOUT
VM
VM
SF00093
Waveform 1. Propagation Delay for Inverting Output
VIN
VM
VM
tPLH
tPHL
VOUT
VM
VM
SF00092
Waveform 2. Propagation Delay for Non-inverting Output
OE
Y, Y
VM
tPZH
VM
VM
tPHZ
VOH -0.3V
0V
SC00070
Waveform 3. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
OE
VM
VM
tPZL
tPLZ
Y, Y
VM
3.5V
VOL +0.3V
SC00071
Waveform 4. 3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
VCC
VIN
VOUT
RL
PULSE
D.U.T.
GENERATOR
7.0V
90%
NEGATIVE
PULSE
tw
VM
10%
tTHL (tff)
VM
10%
tTLH (tr )
90%
AMP (V)
0.3V
RT
CL RL
Test Circuit for 3-State Outputs
SWITCH POSITION
TEST SWITCH
tPLZ, tPZL closed
All other open
DEFINITIONS:
RL = Load resistor;
see AC electrical characteristics for value.
CL = Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
RT = Termination resistance should be equal to ZOUT of
pulse generators.
POSITIVE
PULSE
10%
tTLH (tr )
90%
VM
tw
tTHL (tf )
90%
VM
AMP (V)
10%
0.3V
Input Pulse Definition
INPUT PULSE REQUIREMENTS
Family
Amplitude VM Rep.Rate tw tTLH
74ALS 3.5V 1.3V 1MHz 500ns 2.0ns
tTHL
2.0ns
SC00072
1991 Feb 08
5
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