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74LVC244ABQ Datasheet(PDF) 10 Page - NXP Semiconductors

No. de pieza 74LVC244ABQ
Descripción Electrónicos  Octal buffer/line driver; 3-state
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Fabricante Electrónico  NXP [NXP Semiconductors]
Página de inicio  http://www.nxp.com
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74LVC244ABQ Datasheet(HTML) 10 Page - NXP Semiconductors

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74LVC_LVCH244A_6
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 — 13 August 2009
10 of 18
NXP Semiconductors
74LVC244A; 74LVCH244A
Octal buffer/line driver; 3-state
[1]
The circuit performs better when RL = 1 kΩ.
Test data is given in Table 9.
Definitions for test circuit:
RL = Load resistance.
CL = Load capacitance including jig and probe capacitance.
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
VEXT = External voltage for measuring switching times.
Fig 8.
Test circuit for measuring switching times
VM
VM
tW
tW
10 %
90 %
0 V
VI
VI
negative
pulse
positive
pulse
0 V
VM
VM
90 %
10 %
tf
tr
tr
tf
001aae331
VEXT
VCC
VI
VO
DUT
CL
RT
RL
RL
G
Table 9.
Test data
Supply voltage
Input
Load
VEXT
VI
tr, tf
CL
RL
tPLH, tPHL
tPLZ, tPZL
tPHZ, tPZH
1.2 V
VCC
≤ 2.5 ns
50 pF
500
Ω[1]
open
2
× VCC
GND
2.7 V
2.7 V
≤ 2.5 ns
50 pF
500
Ω
open
2
× VCC
GND
3.0 V to 3.6 V
2.7 V
≤ 2.5 ns
50 pF
500
Ω
open
2
× VCC
GND


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