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參數資料
| 型號： | SN74LS348D |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-INPUT PRIORITY ENCODERS WITH 3-STATE OUTPUTS |
| 中文描述： | LS SERIES, 8-BIT ENCODER, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數： | 1/6頁 |
| 文件大小： | 216K |
| 代理商： | SN74LS348D |
5-499
FAST AND LS TTL DATA
8-INPUT PRIORITY ENCODERS
WITH 3-STATE OUTPUTS
The SN54/74LS348 and the SN54/74LS848 are eight input priority encod-
ers which provide the 8-line to 3-line function.
The outputs (A0–A2) and inputs (0–7) are active low. The active low input
which has the highest priority (input 7 has the highest) is represented on the
outputs (output A0 is the lowest bit). An example would be if inputs 1, 2 and 4
were low, then a binary 4 would be represented on the outputs.
The GS (Group Signal) output is active low when any of the inputs are low. It
serves to indicate when any of the inputs are active.
A0, A1 and A2 are three-state outputs. This allows for up to 64 line expan-
sion without the need for special external circuitry.
A logical one on the Enable Input (EI) forces A0, A1 ared A2 to the disabled
state and outputs GS and EO to the high state. A high on all data inputs (0–7)
together with a low on the EI input disables outputs A0, A1, and A2 and forces
output GS to the high state and output EO to the low state.
Use of the EI input in conjunction with the EO output provides for the capa-
bility of having priority encoding of n input signals.
The LS848 has special internal circuitry providing for a greatly reduced neg-
ative going glitch on the GS (Group Signal) output and on a reduced tendency
for the A0, A1 and A2 outputs to become momentarily enabled. Both of these
occurrences happen when the EI input goes from a logical one to a logical zero
and all data inputs (0–7) are held at logical ones. The internal glitch reduction
circuitry does add an additional fan-in of one on all data inputs (compared to
that of the LS348).
FUNCTION TABLE
INPUTS
OUTPUTS
EI
0
1
2
3
4
5
6
7
A2
A1
A0
GS
EO
H
L
L
L
L
L
L
L
L
L
X
H H H H H H H H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
X
X
L
H H H H H
X
L
H H H H H H
L
H H H H H H H
X
X
X
X
X
X
X
Z
Z
L
L
L
L
H
H
H
H
Z
Z
L
L
H
H
L
L
H
H
Z
Z
L
H
L
H
L
H
L
H
H
H
L
L
L
L
L
L
L
L
H
L
H
H
H
H
H
H
H
H
X
X
X
L
H H H H
X
X
L
H H H
X
L
H H
L
H
SN54/74LS348
SN54/74LS848
8-INPUT PRIORITY ENCODERS
WITH 3-STATE OUTPUTS
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
16
1
D SUFFIX
SOIC
CASE 751B-03
H = HIGH Logic Level
L = LOW Logic Level
X = Irrelevant
Z = High Impedance State
相關PDF資料 |
PDF描述 |
|---|---|
| SN54LS848J | Quad D-type Flip-Flop with Common Clock and Reset; Package: SOIC 16 LEAD; No of Pins: 16; Container: Tape and Reel; Qty per Container: 2500 |
| SN74LS848D | Sensitive Gate Silicon Controlled Rectifier; Package: TO-92 (TO-226) 5.33mm Body Height; No of Pins: 3; Container: Tape and Ammunition Box; Qty per Container: 2000 |
| SN74LS848N | Sensitive Gate Silicon Controlled Rectifier; Package: TO-92 (TO-226) 5.33mm Body Height; No of Pins: 3; Container: Bulk; Qty per Container: 5000 |
| SN74LS348N | 8-INPUT PRIORITY ENCODERS WITH 3-STATE OUTPUTS |
| SN74LS353D | DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SN74LS348DE4 | 功能描述:編碼器、解碼器、復用器和解復用器 8-Line To 3-Line Priority Encoder RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS348DG4 | 功能描述:編碼器、解碼器、復用器和解復用器 8Line To 3 Line Priority Encoder RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS348DR | 功能描述:編碼器、解碼器、復用器和解復用器 8-Line To 3-Line Priority Encoder RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS348DRE4 | 功能描述:編碼器、解碼器、復用器和解復用器 8-Line To 3-Line Priority Encoder RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS348DRG4 | 功能描述:編碼器、解碼器、復用器和解復用器 8Line To 3 Line Priority Encoder RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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