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SN74ALS638A Scheda tecnica(PDF) 3 Page - Texas Instruments

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Il numero della parte SN74ALS638A
Spiegazioni elettronici  OCTAL BUS TRANSCEIVERS
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SN74ALS638A Scheda tecnica(HTML) 3 Page - Texas Instruments

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SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639
OCTAL BUS TRANSCEIVERS
SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
SN74ALS638A
SN74ALS639A
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
AorB ports
24
mA
IOL
Low-level output current
A or B ports
48†
mA
TA
Operating free-air temperature
0
70
°C
† Applies only to the SN74ALS638A-1 version and only if VCC is between 4.75 V and 5.25 V
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN74ALS638A
SN74ALS639A
UNIT
MIN
TYP‡
MAX
VIK
VCC = 4.5 V,
II = – 18 mA
– 1.5
V
IOH
A ports
VCC = 4.5 V,
VOH = 5.5 V
0.1
mA
VCC = 4.5 V to 5.5 V,
IOH = – 0.4 mA
VCC –2
VOH
B ports
VCC =4 5V
IOH = – 3 mA
2.4
3.2
V
VCC = 4.5 V
IOH = – 15 mA
2
IOL = 12 mA
0.25
0.4
VOL
A or B ports
VCC = 4.5 V
IOL = 24 mA
0.35
0.5
V
IOL = 48 mA†
0.35
0.5
II
Control inputs
VCC =5 5V
VI = 7 V
0.1
mA
II
A or B ports
VCC = 5.5 V
VI = 5.5 V
0.1
mA
IIH
Control inputs
VCC =5 5V
VI =2 7V
20
µA
IIH
A or B ports§
VCC = 5.5 V,
VI = 2.7 V
20
µA
IIL
Control inputs
VCC =5 5V
VI =0 4V
– 0.1
mA
IIL
A or B ports§
VCC = 5.5 V,
VI = 0.4 V
– 0.1
mA
IO¶
B ports
VCC = 5.5 V,
VO = 2.25 V
–30
–112
mA
Outputs high
18
30
SN74ALS638A
VCC = 5.5 V
Outputs low
26
41
ICC
Outputs disabled
16
30
mA
ICC
Outputs high
25
40
mA
SN74ALS639A
VCC = 5.5 V
Outputs low
30
50
Outputs disabled
33
54
† Applies only to the SN74ALS638A-1 version and only if VCC is between 4.75 V and 5.25 V
‡ All typical values are at VCC = 5 V, TA = 25°C.
§ For I/O ports, the parameters IIH and IIL include the off-state output current.
¶ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.


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