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SN74ALS245A-1DWRE4 数据表(PDF) 3 Page - Texas Instruments

部件名 SN74ALS245A-1DWRE4
功能描述  OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

SN74ALS245A-1DWRE4 数据表(HTML) 3 Page - Texas Instruments

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SN54ALS245A, SN54AS245, SN74ALS245A, SN74AS245
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS272A – NOVEMBER 1994 – REVISED JANUARY 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 2)
SN54ALS245A
SN74ALS245A
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5
5.5
4.5
5
5.5
V
VIH
High-level input voltage
2
2
V
VIL
Low-level input voltage
0.7
0.8
V
IOH
High-level output current
– 12
– 15
mA
IOL
Low level output current
12
24
mA
IOL
Low-level output current
48†
mA
TA
Operating free-air temperature
– 55
125
0
70
°C
† Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
NOTE 2: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS245A
SN74ALS245A
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
30
48
30
45
ICC
VCC = 5.5 V
Outputs low
36
60
36
55
mA
Outputs disabled
38
63
38
58
† Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
‡ All typical values are 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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