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74ALS244 датащи(PDF) 5 Page - NXP Semiconductors

номер детали 74ALS244
подробное описание детали  Octal buffer 3-State
Download  9 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74ALS244 датащи(HTML) 5 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74ALS244A/74ALS244A-1
Octal buffer (3-State)
1991 Feb 08
5
AC WAVEFORMS
For all waveforms, VM = 1.3V.
VM
VM
VM
VM
Yn
Ian, Ibn
tPLH
tPHL
SF00231
Waveform 1.
Propagation Delay for Non-inverting Outputs
VOH–0.3V
VM
VM
VM
Yn
tPZH
tPHZ
SF00233
OEn
0V
Waveform 2.
3-State Output Enable Time to High Level
and Output Disable Time from High Level
VOL+0.3V
VM
VM
VM
Yn
tPZL
tPLZ
SF00234
OEn
3.5V
Waveform 3.
3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
tw
90%
VM
10%
90%
VM
10%
90%
VM
10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0.3V
0.3V
tTHL (tff)
INPUT PULSE REQUIREMENTS
Rep.Rate
tw
tTLH
tTHL
1MHz
500ns
2.0ns
2.0ns
Input Pulse Definition
VCC
Family
74ALS
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN
VOUT
Test Circuit for 3-State Outputs
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.
tTHL (tf )
tTLH (tr )
tTLH (tr )
AMP (V)
Amplitude
3.5V
1.3V
VM
SC00072
RL
7.0V
SWITCH POSITION
TEST
SWITCH
tPLZ, tPZL
closed
All other
open


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