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PDF SN74LS748 Data sheet ( Hoja de datos )

Número de pieza SN74LS748
Descripción 10-LINE-TO-4-LINE AND 8-LINE-TO-3-LINE PRIORITY ENCODERS
Fabricantes Motorola Semiconductors 
Logotipo Motorola Semiconductors Logotipo



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No Preview Available ! SN74LS748 Hoja de datos, Descripción, Manual

10-LINE-TO-4-LINE
AND 8-LINE-TO-3-LINE
PRIORITY ENCODERS
The SN54 / 74LS147 and the SN54/ 74LS148 are Priority Encoders. They
provide priority decoding of the inputs to ensure that only the highest order
data line is encoded. Both devices have data inputs and outputs which are
active at the low logic level.
The LS147 encodes nine data lines to four-line (8-4-2-1) BCD. The implied
decimal zero condition does not require an input condition because zero is
encoded when all nine data lines are at a high logic level.
The LS148 encodes eight data lines to three-line (4-2-1) binary (octal). By
providing cascading circuitry (Enable Input EI and Enable Output EO) octal
expansion is allowed without needing external circuitry.
The SN54 / 74LS748 is a proprietary Motorola part incorporating a built-in
deglitcher network which minimizes glitches on the GS output. The glitch
occurs on the negative going transition of the EI input when data inputs 0 – 7
are at logical ones.
The only dc parameter differences between the LS148 and the LS748 are
that (1) Pin 10 (input 0) has a fan-in of 2 on the LS748 versus a fan-in of 1 on
the LS148; (2) Pins 1, 2, 3, 4, 11, 12 and 13 (inputs 1, 2, 3, 4, 5, 6, 7) have a
fan-in of 3 on the LS748 versus a fan-in of 2 on the LS148.
The only ac difference is that tPHL from EI to EO is changed from 40 to
45 ns.
SN54 / 74LS147
(TOP VIEW)
OUTPUT
INPUTS
OUTPUT
VCC NC D 3 2 1 9 A
16 15 14 13 12 11 10 9
D 32 1 9
4A
5 678C B
1 2 3 4 56 78
4 5 6 7 8 C B GND
INPUTS
OUTPUTS
SN54 / 74LS148
SN54 / 74LS748
(TOP VIEW)
OUTPUTS
VCC EO GS
16 15 14
3
13
INPUTS
21
12 11
OUTPUT
0 A0
10 9
EO GS 3 2 1
0
4 A0
5 6 7 EI A2 A1
1 2 3 4 56
78
4 5 6 7 E1 A2 A1 GND
INPUTS
OUTPUTS
FAST AND LS TTL DATA
5-245
SN54/74LS147
SN54/74LS148
SN54/74LS748
10-LINE-TO-4-LINE
AND 8-LINE-TO-3-LINE
PRIORITY ENCODERS
LOW POWER SCHOTTKY
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC

1 page




SN74LS748 pdf
SN54/74LS147 SN54/74LS148 SN54/74LS748
AC CHARACTERISTICS (VCC = 5.0 V, TA = 25°C)
SN54 / 74LS147
Symbol
tPLH
tPHL
tPLH
tPHL
From
(Input)
Any
Any
To
(Output)
Any
Any
Waveform
In-phase
output
Out-of-phase
output
SN54 / 74LS148
SN54 / 74LS748
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
From
(Input)
1 thru 7
1 thru 7
0 thru 7
0 thru 7
EI
EI
EI
To
(Output)
A0, A1, or A2
Waveform
In-phase
output
Out-of-phase
A0, A1, or A2
output
Out-of-phase
EO output
In-phase
GS output
A0, A1, or A2
In-phase
output
In-phase
GS output
EO
In-phase
output
Limits
Min Typ Max
12 18
12 18
21 33
15 23
Limits
Min Typ Max
14 18
15 25
20 36
16 29
7.0 18
25 40
35 55
9.0 21
16 25
12 25
12 17
14 36
12 21
28 40
30 45
Unit Test Conditions
ns
CL = 15 pF,
RL = 2.0 k
ns
Unit Test Conditions
ns
ns
ns
CL = 15 pF,
ns RL = 2.0 k
ns
ns
ns (LS148)
(LS748)
FAST AND LS TTL DATA
5-249

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