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参数资料
| 型号： | 54F139LM |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 编、解码器及复用、解复用 |
| 英文描述： | Dual 1-of-4 Decoder/Demultiplexer |
| 中文描述： | F/FAST SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, CQCC20 |
| 封装： | CERAMIC, LCC-20 |
| 文件页数： | 2/8页 |
| 文件大小： | 166K |
| 代理商： | 54F139LM |
Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
A0 A1
Address Inputs
1010
20 mA b06 mA
E
Enable Inputs (Active LOW)
1010
20 mA b06 mA
O0–O3
Outputs (Active LOW)
50333
b
1 mA20 mA
Functional Description
The ’F139 is a high-speed dual 1-of-4 decoderdemultiplex-
er The device has two independent decoders each of
which accepts two binary weighted inputs (A0–A1) and pro-
vides four mutually exclusive active LOW Outputs (O0–O3)
Each decoder has an active LOW enable (E) When E is
HIGH all outputs are forced HIGH The enable can be used
as the data input for a 4-output demultiplexer application
Each half of the ’F139 generates all four minterms of two
variables These four minterms are useful in some applica-
tions replacing multiple gate functions as shown in
Figure 1
and thereby reducing the number of packages required in a
logic network
Truth Table
Inputs
Outputs
E
A0
A1
O0
O1
O2
O3
HX
X
H
LL
L
H
LH
L
H
L
H
LL
H
L
H
LH
H
L
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
TLF9479 – 6
FIGURE 1 Gate Functions
(each half)
Logic Diagram
TLF9479 – 5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
2
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相关代理商/技术参数 |
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|---|---|
| 54F139LMQB | 制造商:Texas Instruments 功能描述:Decoder/Demultiplexer Dual 2-to-4 20-Pin CLLCC Rail 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 54F13DMQB | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| 54F13FMQB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 54F13LMQB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 54F14 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Hex Inverter Schmitt Trigger |
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