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SN74AC240DWR 数据表(PDF) 5 Page - Texas Instruments

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部件名 SN74AC240DWR
功能描述  OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS
Download  22 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74AC240DWR 数据表(HTML) 5 Page - Texas Instruments

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SN54AC240, SN74AC240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCAS512E − JUNE 1995 − REVISED OCTOBER 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching
characteristics
over
recommended
operating
free-air
temperature
range,
VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
TA = 25°C
SN54AC240
SN74AC240
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
tPLH
A
Y
1.5
4.5
6.5
1
8.5
1
7
ns
tPHL
A
Y
1.5
4.5
6
1
8
1
6.5
ns
tPZH
OE
Y
1.5
5
7
1
9
1
8
ns
tPZL
OE
Y
1.5
5.5
8
1
10.5
1
8.5
ns
tPHZ
OE
Y
2.5
6.5
9
1
10.5
1
9.5
ns
tPLZ
OE
Y
2
6.5
9
1
11
1
9.5
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance per buffer/driver
CL = 50 pF,
f = 1 MHz
45
pF
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
S1
2
× VCC
500
Ω
500
Ω
tPLH
tPHL
Output
Control
(low-level
enabling)
Output
Waveform 1
S1 at 2
× VCC
(see Note B)
Output
Waveform 2
S1 at Open
(see Note B)
VOL
VOH
tPZL
tPZH
tPLZ
tPHZ
50% VCC
50% VCC
50% VCC
50% VCC
≈VCC
VCC
0 V
50% VCC
50% VCC
VOH
VOL
0 V
50% VCC
VOL + 0.3 V
50% VCC
VOH − 0.3 V
≈0 V
VCC
Open
Input
Output
VOLTAGE WAVEFORMS
VOLTAGE WAVEFORMS
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open
2
× VCC
Open
TEST
S1
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. All input pulses are supplied by generators having the following characteristics: PRR
≤ 1 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
D. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms


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