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SN74AS639N 数据表(PDF) 5 Page - Texas Instruments

部件名 SN74AS639N
功能描述  OCTAL BUS TRANSCEIVERS
Download  16 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74AS639N 数据表(HTML) 5 Page - Texas Instruments

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SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639
OCTAL BUS TRANSCEIVERS
SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN74AS638A
SN74AS639
UNIT
MIN
TYP†
MAX
VIK
VCC = 4.5 V,
II = – 18 mA
– 1.2
V
IOH
A ports
VCC = 4.5 V,
VOH = 5.5 V
0.1
mA
VCC = 4.5 V to 5.5 V,
IOH = – 2 mA
VCC –2
VOH
B ports
VCC =4 5V
IOH = – 3 mA
2.4
3.2
V
VCC = 4.5 V
IOH = – 15 mA
2.4
VOL
A or B ports
VCC = 4.5 V,
IOL = 64 mA
0.35
0.55
V
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
70
µA
IIL
Control inputs
VCC =5 5V
VI =0 4V
– 0.5
mA
IIL
A or B ports‡
VCC = 5.5 V,
VI = 0.4 V
– 0.75
mA
IO§
VCC = 5.5 V,
VO = 2.25 V
–50
– 150
mA
Outputs high
24
54
SN74AS638A
VCC = 5.5 V
Outputs low
75
122
ICC
Outputs disabled
37
61
mA
ICC
Outputs high
56
92
mA
SN74AS639
VCC = 5.5 V
Outputs low
95
154
Outputs disabled
62
100
† 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.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω (A outputs),
R1 = R2 = 500
Ω (B outputs),
TA = MIN to MAX¶
UNIT
SN74AS638A
SN74AS639
MIN
MAX
MIN
MAX
tPLH
A
B
2
7
2
9.5
ns
tPHL
A
B
2
6.5
2
9
ns
tPLH
B
A
5
20
5
22
ns
tPHL
B
A
2
7
2
9
ns
tPLH
OE
A
5
19
5
21.5
ns
tPHL
OE
A
2
9
2
11.5
ns
tPZH
OE
B
2
8
2
10.5
ns
tPZL
OE
B
2
10
2
10.5
ns
tPHZ
OE
B
2
7
2
7
ns
tPLZ
OE
B
2
10
2
10.5
ns
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.


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