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TI1-TIM9907.pdf
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TI1-TIM9907.pdf
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SDLS053B − OCTOBER 1976 − REVISED MAY 2004
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
’147, ’LS147
D Encode 10-Line Decimal to 4-Line BCD
D Applications Include:
− Keyboard Encoding
− Range Selection
’148, ’LS148
D Encode 8 Data Lines to 3-Line Binary
(Octal)
D Applications Include:
− n-Bit Encoding
− Code Converters and Generators
3212019
910111213
4
5
6
7
8
18
17
16
15
14
D
3
NC
2
1
6
7
NC
8
C
5
4
NC
A
9
V
NC
B
GND
NC
SN54LS147 ...FK PACKAGE
(TOP VIEW)
CC
NC − No internal connection
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
4
5
6
7
8
C
B
GND
V
CC
NC
D
3
2
1
9
A
SN54147, SN54LS147 ...J OR W PACKAGE
SN74147, SN74LS147 ...D OR N PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
4
5
6
7
EI
A2
A1
GND
V
CC
E0
GS
3
2
1
0
A0
SN54148, SN54LS148 ...J OR W PACKAGE
SN74148, SN74LS148 . . . D, N, OR NS PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
GS
3
NC
2
1
6
7
NC
EI
A2
5
4
NC
A0
0
V
E0
A1
GND
NC
SN54LS148 . . . FK PACKAGE
(TOP VIEW)
CC
TYPE
TYPICAL
DATA
DELAY
TYPICAL
POWER
DISSIPATION
’147 10 ns 225 mW
’148 10 ns 190 mW
’LS147 15 ns 60 mW
’LS148 15 ns 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 o
f
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2004, Texas Instruments Incorporated
!"#$ % &'!!($ #% )'*+&#$ ,#$(-
!,'&$% &!" $ %)(&&#$% )(! $.( $(!"% (/#% %$!'"($%
%$#,#!, 0#!!#$1- !,'&$ )!&(%%2 ,(% $ (&(%%#!+1 &+',(
$(%$2 #++ )#!#"($(!%-
)!,'&$% &")+#$ $ 3 #++ )#!#"($(!% #!( $(%$(,
'+(%% $.(!0%( $(,- #++ $.(! )!,'&$% )!,'&$
)!&(%%2 ,(% $ (&(%%#!+1 &+',( $(%$2 #++ )#!#"($(!%-
SDLS053B − OCTOBER 1976 − REVISED MAY 2004
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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
T
A
PACKAGE
†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP − N Tube SN74LS148N SN74LS148N
0°C to 70°C
SOIC − D
Tube SN74LS148D
LS148
0°C to 70°C SOIC − D
Tape and reel SN74LS148DR
LS148
SOP − NS Tape and reel SN74LS148NSR 74LS148
CDIP − J Tube SNJ54LS148J SNJ54LS148J
−55°C to 125°C
CFP − W Tube SNJ54LS148W SNJ54LS148W
−55 C to 125 C
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
OUTPUTS
1 2 3 4 5 6 7 8 9 D C B A
H H H H H H H H H H H H H
X XXXXXXXLLHHL
X XXXXXXLHLHHH
X XXXXXLHHHLLL
X XXXXLHHHHLLH
X XXXLHHHHHLHL
X XXLHHHHHHLHH
X XLHHHHHHHHLL
X LHHHHHHHHHLH
L H H H H H H H H H H H L
H = high logic level, L = low logic level, X = irrelevant
SDLS053B − OCTOBER 1976 − REVISED MAY 2004
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
FUNCTION TABLE − ’148, ’LS148
INPUTS OUTPUTS
EI 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO
H X X X X X X X X H H H H H
L H HHHHHHHHHHHL
L X XXXXXXLLLLLH
L X XXXXXLHLLHLH
L X XXXXLHHLHLLH
L X XXXLHHHLHHLH
L X XXLHHHHHLLLH
L X XLHHHHHHLHLH
L X LHHHHHHHHLLH
L L H H H H H H H H H H L H
H = high logic level, L = low logic level, X = irrelevant
SDLS053B − OCTOBER 1976 − REVISED MAY 2004
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
’147, ’LS147 logic diagram (positive logic)
(11)
(12)
(13)
(1)
(2)
(3)
(4)
(5)
(10)
1
2
3
4
5
6
7
8
9
D
B
C
A
(9)
(7)
(6)
(14)
Pin numbers shown are for D, J, N, and W packages.
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