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

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

’LS147, ’LS148

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inter-emitter voltage: ’148 only (see Note 2)

5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance

73

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package

67

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NS package

64

°C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−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.