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SN74AS640N Datasheet(PDF) 3 Page - Texas Instruments

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Part # SN74AS640N
Description  OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN74AS640N Datasheet(HTML) 3 Page - Texas Instruments

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SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS640B
SN74ALS640B
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
MIN
TYP†
MAX
UNIT
VIK
VCC = 4.5 V,
II = – 18 mA
– 1.5
– 1.5
V
VCC = 4.5 V to 5.5 V,
IOH = – 0.4 mA
VCC –2
VCC –2
VOH
IOH = – 3 mA
2.4
3.2
2.4
3.2
V
VOH
VCC = 4.5 V
IOH = – 12 mA
2
V
IOH = – 15 mA
2
IOL = 12 mA
0.25
0.4
0.25
0.4
VOL
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
0.1
mA
II
A or B ports
VCC = 5.5 V
VI = 5.5 V
0.1
0.1
mA
IIH
Control inputs
VCC =5 5V
VI =2 7V
20
20
µA
IIH
A or B ports§
VCC = 5.5 V,
VI = 2.7 V
20
20
µA
IIL
Control inputs
VCC =5 5V
VI =0 4V
– 0.1
– 0.1
mA
IIL
A or B ports§
VCC = 5.5 V,
VI = 0.4 V
– 0.1
– 0.1
mA
IO¶
VCC = 5.5 V,
VO = 2.25 V
–20
–112
–30
–112
mA
Outputs high
19
50
19
45
ICC
VCC = 5.5 V
Outputs low
27
60
27
55
mA
Outputs disabled
28
55
28
50
† All typical values are at VCC = 5 V, TA = 25°C.
‡ Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
§ 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,
R1 = 500
,
R2 = 500
,
TA = MIN to MAX#
UNIT
SN54ALS640B
SN74ALS640B
MIN
MAX
MIN
MAX
tPLH
AorB
BorA
2
14
2
11
ns
tPHL
A or B
B or A
2
13
2
10
ns
tPZH
OE
AorB
4
25
4
21
ns
tPZL
OE
A or B
5
27
5
24
ns
tPHZ
OE
AorB
2
12
2
10
ns
tPLZ
OE
A or B
3
20
3
15
ns
# For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.


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