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LS148 Scheda tecnica(PDF) 7 Page - Texas Instruments

Il numero della parte LS148
Spiegazioni elettronici  10-LINE TO 4-LINE AND 8-LINE TO 3-LINE PRIORITY ENCODERS
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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LS148 Scheda tecnica(HTML) 7 Page - Texas Instruments

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SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10LINE TO 4LINE AND 8LINE TO 3LINE PRIORITY ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
Supply voltage, VCC (see Note 1)
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI: ’147, ’148
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
’LS147, ’LS148
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inter-emitter voltage: ’148 only (see Note 2)
5.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance
θJA (see Note 3): D package
73
°C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
67
°C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NS package
64
°C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, Tstg
−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.
NOTES:
1. Voltage values, except inter-emitter voltage, are with respect to the network ground terminal.
2. This is the voltage between two emitters of a multiple-emitter transistor. For ’148 circuits, this rating applies between any two of the
eight data lines, 0 through 7.
3. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 4)
SN54’
SN74’
SN54LS’
SN74LS’
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC Supply voltage
4.5
5
5.5
4.75
5
5.25
4.5
5
5.5
4.75
5
5.25
V
IOH
High-level output current
−800
−800
−400
−400
µA
IOL
Low-level output current
16
16
4
8
mA
TA
Operating free-air temperature
−55
125
0
70
−55
125
0
70
°C
NOTE 4: 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.


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