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SN74AC245DWRE4 데이터시트(PDF) 5 Page - Texas Instruments

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부품명 SN74AC245DWRE4
상세설명  OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
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SN54AC245, SN74AC245
OCTAL BUS TRANSCEIVERS
WITH 3STATE OUTPUTS
SCAS461F − FEBRUARY 1995 − REVISED OCTOBER 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range,
VCC = 5 V " 5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
TA = 25°C
SN54AC245
SN74AC245
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
tPLH
A or B
B or A
1.5
3.5
6.5
1
8.5
1
7
ns
tPHL
A or B
B or A
1.5
3.5
6
1
7.5
1
7
ns
tPZH
OE
A or B
1.5
5
8.5
1
10
1
9
ns
tPZL
OE
A or B
1.5
5.5
9
1
10.5
1
9.5
ns
tPHZ
OE
A or B
1.5
5.5
9
1
10.5
1
10
ns
tPLZ
OE
A or B
1.5
5.5
9
1
10.5
1
10
ns
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance per transceiver
CL = 50 pF,
f = 1 MHz
45
pF
PARAMETER MEASUREMENT INFORMATION
tPHL
tPLH
tPLH
tPHL
Input
Out-of-Phase
Output
50%
50%
50% VCC
50% VCC
50% VCC
50% VCC
VCC
0 V
VOL
VOH
VOH
VOL
In-Phase
Output
VOLTAGE WAVEFORMS
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
S1
2
× VCC
500
500
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
≈VCC
0 V
50% VCC
VOL + 0.3 V
50% VCC
VOH − 0.3 V
≈0 V
VCC
Open
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 v 2.5 ns, tf v 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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