74ALS240A 查看數據表（PDF） - Philips Electronics
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74ALS240A Datasheet PDF : 9 Pages
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Philips Semiconductors
Octal inverter buffer (3-State)
Product specification
74ALS240A/
74ALS240A-1
AC WAVEFORMS
For all waveforms, VM = 1.3V.
Ian, Ibn VM
tPHL
VM
tPLH
Yn
VM
VM
SF00328
Waveform 1. Propagation Delay for Non-Inverting Output
OEn
Yn
VM
tPZH
VM
tPHZ
VM
VOH –0.3V
0V
SC00077
Waveform 2. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
OEn
VM
VM
tPZL
tPLZ
Yn
VM
3.5V
VOL +0.3V
SC00078
Waveform 3. 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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