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SN74HCT125NE4 Folha de dados(PDF) 4 Page - Texas Instruments

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Nome de Peças SN74HCT125NE4
Descrição Electrónicos  QUADRUPLE BUS BUFFER GATES WITH 3-STATE OUTPUTS
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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SN54HCT125, SN74HCT125
QUADRUPLE BUS BUFFER GATES
WITH 3-STATE OUTPUTS
SCLS069E – NOVEMBER 1988 – REVISED AUGUST 2003
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
1.3 V
10%
90%
3 V
≈VCC
VOL
0 V
Input
Output
Waveform 1
(See Note B)
1.3 V
tPZL
tPLZ
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
VOH
≈0 V
1.3 V
1.3 V
tPZH
tPHZ
Output
Waveform 2
(See Note B)
From Output
Under Test
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
RL
S1
Closed
Open
S2
Open
Closed
Closed
Open
50 pF
or
150 pF
Open
Open
––
NOTES: A. CL includes probe and jig 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.
CL
(see Note A)
1.3 V
1.3 V
1.3 V
10%
10%
90%
90%
3 V
VOH
VOL
0 V
tr
tf
Input
Output
1.3 V
tPLH
tPHL
Figure 1. Load Circuit and Voltage Waveforms


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