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SN74HCT244PWRG4 데이터시트(PDF) 5 Page - Texas Instruments

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부품명 SN74HCT244PWRG4
상세설명  OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
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SN54HCT244, SN74HCT244
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SCLS175D – MARCH 1984 – REVISED AUGUST 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
1.3 V
10%
90%
3 V
≈VCC
VOL
0 V
Output
Control
(Low-Level
Enabling)
Output
Waveform 1
(See Note B)
1.3 V
tPZL
tPLZ
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 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.
CL
(see Note A)
Test
Point
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
1.3 V
1.3 V
0.3 V
0.3 V
2.7 V
2.7 V
3 V
0 V
tr
tf
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT RISE AND FALL TIMES
1.3 V
1.3 V
1.3 V
10%
10%
90%
90%
3 V
VOH
VOL
0 V
tr
tf
Input
In-Phase
Output
1.3 V
tPLH
tPHL
1.3 V
1.3 V
10%
10%
90%
90%
VOH
VOL
tr
tf
tPHL
tPLH
Out-of-
Phase
Output
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
Figure 1. Load Circuit and Voltage Waveforms


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