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參數(shù)資料
| 型號： | 74148 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 10-LINE TO 4-LINE AND 8-LINE TO 3-LINE PRIORITY ENCODERS |
| 中文描述： | 10線的4線和8線三線優(yōu)先編碼器 |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 623K |
| 代理商： | 74148 |
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, V
CC
(see Note 1)
Input voltage, V
I
:
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
’LS147, ’LS148
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inter-emitter voltage: ’148 only (see Note 2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance
θ
JA
(see Note 3): D package
N package
NS package
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
’147, ’148
5.5 V
7 V
5.5 V
73
°
C/W
67
°
C/W
64
°
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
65
°
C to 150
°
C
recommended operating conditions (see Note 4)
SN54’
NOM
SN74’
NOM
SN54LS’
NOM
SN74LS’
NOM
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
VCC
IOH
IOL
TA
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.
Supply voltage
4.5
5
5.5
4.75
5
5.25
4.5
5
5.5
4.75
5
5.25
V
μ
A
mA
°
C
High-level output current
800
800
400
400
Low-level output current
16
16
4
8
Operating free-air temperature
55
125
0
70
55
125
0
70
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