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SN74AS639DW Fiches technique(PDF) 4 Page - Texas Instruments

No de pièce SN74AS639DW
Description  OCTAL BUS TRANSCEIVERS
Download  16 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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SN74AS639DW Fiches technique(HTML) 4 Page - Texas Instruments

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SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639
OCTAL BUS TRANSCEIVERS
SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 680 Ω (A outputs),
R1 = R2 = 500
Ω (B outputs),
TA = MIN to MAX†
UNIT
SN74ALS638A
SN74ALS639A
MIN
MAX
MIN
MAX
tPLH
A
B
2
12
2
12
ns
tPHL
A
B
2
12
2
12
ns
tPLH
B
A
8
25
10
30
ns
tPHL
B
A
8
30
5
22
ns
tPLH
OE
A
5
25
10
30
ns
tPHL
OE
A
10
45
10
35
ns
tPZH
OE
B
5
20
6
21
ns
tPZL
OE
B
5
22
8
25
ns
tPHZ
OE
B
2
10
2
10
ns
tPLZ
OE
B
3
15
3
16
ns
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI: All inputs
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-bus I/O ports
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-bus I/O ports
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN74AS638A, SN74AS639
0
°C to 70°C
. . . . . . . . . . . . . . . . . . . .
Storage temperature range
– 65
°C to 150°C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN74AS638A
SN74AS639
UNIT
MIN
NOM
MAX
VCC
Supply voltage
4.5
5
5.5
V
VIH
High-level input voltage
2
V
VIL
Low-level input voltage
0.8
V
VOH
High-level output voltage
A ports
5.5
V
IOH
High-level output current
B ports
–15
mA
IOL
Low-level output current
A or B ports
64
mA
TA
Operating free-air temperature
0
70
°C


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