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參數(shù)資料
| 型號： | SN74LS147DR2 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 算術(shù)邏輯單元 |
| 英文描述： | LS SERIES, 9-BIT ENCODER, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 1/5頁 |
| 文件大?。?/td> | 94K |
| 代理商： | SN74LS147DR2 |
5-1
FAST AND LS TTL DATA
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)
SN54 / 74LS148
SN54 / 74LS748
(TOP VIEW)
45
678
C
B
GND
D3
2
1
9
A
VCC
NC
14
13
12
11
10
9
12345
6
7
16
15
8
D3
2
1
9
A
4
56
7
8
C
B
OUTPUT
INPUTS
OUTPUT
INPUTS
OUTPUTS
4
5
6
7
E1
A2
A1
GND
VCC
EO
GS
3
2
1
0
A0
14
13
12
11
10
9
123
45
6
7
16
15
8
EO
GS
3
2
1
0
A0
4
56
7
EI
A2
A1
OUTPUTS
INPUTS
OUTPUT
INPUTS
OUTPUTS
SN54/74LS147
SN54/74LS148
SN54/74LS748
10-LINE-TO-4-LINE
AND 8-LINE-TO-3-LINE
PRIORITY ENCODERS
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN
Plastic
SN74LSXXXD
SOIC
16
1
D SUFFIX
SOIC
CASE 751B-03
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| SN74LS14NS | LS SERIES, HEX 1-INPUT INVERT GATE, PDIP14 |
| SN74LS14JS | LS SERIES, HEX 1-INPUT INVERT GATE, CDIP14 |
| SN74LS151MEL | LS SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDSO16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SN74LS148D | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 8 to 3 Priority RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS148DE4 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 8-line to 3-line Priority encoder RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS148DG4 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 8 Ln to 3 Ln Priority Encoder RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS148DR | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 8 to 3 Priority RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS148DR2 | 制造商:ON Semiconductor 功能描述:Encoder 8-to-3 Priority Bipolar 16-Pin SOIC T/R |
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