74ALS244 查看數據表（PDF） - Philips Electronics
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74ALS244 Datasheet PDF : 9 Pages
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Philips Semiconductors
Octal buffer (3-State)
Product specification
74ALS244A/74ALS244A-1
AC WAVEFORMS
For all waveforms, VM = 1.3V.
Ian, Ibn
Yn
VM
tPLH
VM
tPHL
VM
VM
SF00231
Waveform 1. Propagation Delay for Non-inverting Outputs
OEn
VM
VM
tPZH
tPHZ
VOH–0.3V
Yn
VM
0V
SF00233
Waveform 2. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
OEn
Yn
VM
tPZL
VM
tPLZ
VM
3.5V
VOL+0.3V
SF00234
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
tPLZ, tPZL
All other
SWITCH
closed
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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