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SN74HC148D Datasheet Preview

SN74HC148D Datasheet

8-LINE TO 3-LINE PRIORITY ENCODERS

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D Wide Operating Voltage Range of 2 V to 6 V
D Outputs Can Drive Up To 10 LSTTL Loads
D Low Power Consumption, 80-µA Max ICC
D Typical tpd = 16 ns
D ±4-mA Output Drive at 5 V
D Low Input Current of 1 µA Max
D Encode Eight Data Lines to 3-Line Binary
(Octal)
D Applications Include:
− n-Bit Encoding
− Code Converters and Generators
description/ordering information
The ’HC148 devices feature priority decoding of
the inputs to ensure that only the highest-order
data line is encoded. These devices encode eight
data lines to 3-line (4-2-1) binary (octal).
Cascading circuitry (enable input EI and enable
output EO) has been provided to allow octal
expansion without the need for external circuitry.
Data inputs and outputs are active at the low logic
level.
SN54HC148, SN74HC148
8ĆLINE TO 3ĆLINE PRIORITY ENCODERS
SCLS109G − MARCH 1984 − REVISED APRIL 2004
SN54HC148 . . . J OR W PACKAGE
SN74HC148 . . . D, DW, N, OR NS PACKAGE
(TOP VIEW)
41
52
63
74
EI 5
A2 6
A1 7
GND 8
16 VCC
15 EO
14 GS
13 3
12 2
11 1
10 0
9 A0
SN54HC148 . . . FK PACKAGE
(TOP VIEW)
6
3 2 1 20 19
4
18
GS
75
17 3
NC 6
16 NC
EI 7
15 2
A2 8
14 1
9 10 11 12 13
NC − No internal connection
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N
Tube of 25
SN74HC148N
SN74HC148N
Tube of 40
SN74HC148D
−40°C to 85°C
SOIC − D
Reel of 2500
Reel of 250
SN74HC148DR
SN74HC148DT
HC148
SOIC − DW
Reel of 2000 SN74HC148DWR
HC148
SOP − NS
Reel of 2000 SN74HC148NSR
HC148
CDIP − J
−55°C to 125°C CFP − W
Tube of 25
Tube of 150
SNJ54HC148J
SNJ54HC148W
SNJ54HC148J
SNJ54HC148W
LCCC − FK
Tube of 55
SNJ54HC148FK
SNJ54HC148FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 2004, Texas Instruments Incorporated
On products compliant to MILĆPRFĆ38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
1




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SN74HC148D Datasheet Preview

SN74HC148D Datasheet

8-LINE TO 3-LINE PRIORITY ENCODERS

No Preview Available !

SN54HC148, SN74HC148
8ĆLINE TO 3ĆLINE PRIORITY ENCODERS
SCLS109G − MARCH 1984 − REVISED APRIL 2004
FUNCTION TABLE
INPUTS
EI
0
1
2
3
4
5
6
7
H
X
X
X
X
X
X
X
X
L
H
H
H
H
H
H
H
H
L
X
X
X
X
X
X
X
L
L
X
X
X
X
X
X
L
H
L
X
X
X
X
X
L
H
H
L
X
X
X
X
L
H
H
H
L
X
X
X
L
H
H
H
H
L
X
X
L
H
H
H
H
H
L
X
L
H
H
H
H
H
H
L
L
H
H
H
H
H
H
H
OUTPUTS
A2 A1 A0 GS EO
H
H
H
H
H
H
H
H
H
L
L
L
L
L
H
L
L
H
L
H
L
H
L
L
H
L
H
H
L
H
H
L
L
L
H
H
L
H
L
H
H
H
L
L
H
H
H
H
L
H
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number SN74HC148D
Description 8-LINE TO 3-LINE PRIORITY ENCODERS
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