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SN74LS147 Datasheet Preview

SN74LS147 Datasheet

10-LINE TO 4-LINE AND 8-LINE TO 3-LINE PRIORITY ENCODERS

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SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10ĆLINE TO 4ĆLINE AND 8ĆLINE TO 3ĆLINE PRIORITY ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004
’147, ’LS147
D Encode 10-Line Decimal to 4-Line BCD
D Applications Include:
− Keyboard Encoding
− Range Selection
SN54147, SN54LS147 . . . J OR W PACKAGE
SN74147, SN74LS147 . . . D OR N PACKAGE
(TOP VIEW)
’148, ’LS148
D Encode 8 Data Lines to 3-Line Binary
(Octal)
D Applications Include:
− n-Bit Encoding
− Code Converters and Generators
SN54148, SN54LS148 . . . J OR W PACKAGE
SN74148, SN74LS148 . . . D, N, OR NS PACKAGE
(TOP VIEW)
4
5
6
7
8
C
B
GND
1
2
3
4
5
6
7
8
16 VCC
15 NC
14 D
13 3
12 2
11 1
10 9
9A
4
5
6
7
EI
A2
A1
GND
1
2
3
4
5
6
7
8
16 VCC
15 E0
14 GS
13 3
12 2
11 1
10 0
9 A0
SN54LS147 . . . FK PACKAGE
(TOP VIEW)
SN54LS148 . . . FK PACKAGE
(TOP VIEW)
3 2 1 20 19
64
18 D
75
17 3
NC 6
16 NC
87
15 2
C8
14 1
9 10 11 12 13
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
TYPE
’147
’148
’LS147
’LS148
TYPICAL
DATA
DELAY
10 ns
10 ns
15 ns
15 ns
TYPICAL
POWER
DISSIPATION
225 mW
190 mW
60 mW
60 mW
NOTE: The SN54147, SN54LS147, SN54148, SN74147, SN74LS147, and SN74148 are obsolete and are no longer supplied.
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




etcTI

SN74LS147 Datasheet Preview

SN74LS147 Datasheet

10-LINE TO 4-LINE AND 8-LINE TO 3-LINE PRIORITY ENCODERS

No Preview Available !

SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10ĆLINE TO 4ĆLINE AND 8ĆLINE TO 3ĆLINE PRIORITY ENCODERS
SDLS053B − OCTOBER 1976 − REVISED MAY 2004
description/ordering information
These TTL encoders feature priority decoding of the inputs to ensure that only the highest-order data line is
encoded. The ’147 and ’LS147 devices encode nine data lines to four-line (8-4-2-1) BCD. The implied decimal
zero condition requires no input condition, as zero is encoded when all nine data lines are at a high logic level.
The ’148 and ’LS148 devices encode eight data lines to three-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. For all types, data inputs and outputs are active at the low logic level. All inputs are buffered to represent
one normalized Series 54/74 or 54/74LS load, respectively.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N
Tube
SN74LS148N
SN74LS148N
0°C to 70°C
SOIC − D
Tube
Tape and reel
SN74LS148D
SN74LS148DR
LS148
SOP − NS
Tape and reel SN74LS148NSR
74LS148
CDIP − J
Tube
SNJ54LS148J
SNJ54LS148J
−55°C to 125°C CFP − W
Tube
SNJ54LS148W
SNJ54LS148W
LCCC − FK
Tube
SNJ54LS148FK
SNJ54LS148FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
FUNCTION TABLE − ’147, ’LS147
INPUTS
1 2 3 4 5 6 7 8 9D
HHHHHHHHHH
XXXXXXXXL L
XXXXXXXLHL
XXXXXX LHHH
XXXXX LHHHH
XXXX LHHHHH
XXX LHHHHHH
XX LHHHHHHH
X LHHHHHHHH
L HHHHHHHHH
H = high logic level, L = low logic level, X = irrelevant
OUTPUTS
CB
HH
HH
HH
LL
LL
LH
LH
HL
HL
HH
A
H
L
H
L
H
L
H
L
H
L
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number SN74LS147
Description 10-LINE TO 4-LINE AND 8-LINE TO 3-LINE PRIORITY ENCODERS
Maker etcTI
Total Page 26 Pages
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