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SN74HC245N Datasheet(PDF) 7 Page - Texas Instruments

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No. de pieza SN74HC245N
Descripción Electrónicos  Octal Bus Transceivers
Download  28 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

SN74HC245N Datasheet(HTML) 7 Page - Texas Instruments

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VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
50%
50%
10%
10%
90%
90%
VCC
0 V
tr
t
Input
f
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
50%
50%
10%
10%
90%
90%
VCC
VOH
VOL
0 V
tr
t
Input
f
In-Phase
Output
50%
tPLH
tPHL
50%
50%
10%
10%
90%
90%
VOH
VOL
t
t
r
f
tPHL
tPLH
Out-of-Phase
Output
50%
10%
90%
VCC
≈VCC
VOL
0 V
Output
Control
(Low-Level
Enabling)
Output
Waveform 1
(See Note B)
50%
tPZL
tPLZ
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
VOH
≈0 V
50%
50%
tPZH
tPHZ
Output
Waveform 2
(See Note B)
≈VCC
Test
Point
From Output
Under Test
CL
(see Note A)
RL
VCC
S1
S2
LOAD CIRCUIT
PARAMETER
CL
tPZH
tpd or tt
tdis
ten
tPZL
tPHZ
tPLZ
1 k
1 k
50 pF
or
150 pF
50 pF
Open
Closed
R
S1
L
Closed
Open
S2
Open
Closed
Closed
Open
50 pF
or
150 pF
Open
Open
−−
SN54HC245, SN74HC245
www.ti.com
SCLS131E – DECEMBER 1982 – REVISED SEPTEMBER 2015
7 Parameter Measurement Information
A.
CL includes probe and test-fixture capacitance.
B.
Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output
control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output
control.
C.
Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having
the following characteristics: PRR
≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.
D.
The outputs are measured one at a time with one input transition per measurement.
E.
tPLZ and tPHZ are the same as tdis.
F.
tPZL and tPZH are the same as ten.
G.
tPLH and tPHL are the same as tpd.
Figure 3. Load Circuit and Voltage Waveforms
Copyright © 1982–2015, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Links: SN54HC245 SN74HC245


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