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SN74LVC137A

更新时间： 2024-11-27 05:24:47
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德州仪器 - TI 解复用器锁存器双倍数据速率
页数 文件大小 规格书
8页 117K
描述
3-LINE TO 8-LINE DECODER/DEMULTIPLEXER WITH ADDRESS LATCHES

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SN74LVC137A 数据手册

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SN74LVC137A  
3-LINE TO 8-LINE DECODER/DEMULTIPLEXER  
WITH ADDRESS LATCHES  
www.ti.com  
SCAS340E–MARCH 1994–REVISED FEBRUARY 2005  
FEATURES  
D, DB, OR PW PACKAGE  
(TOP VIEW)  
•
•
•
EPIC™ (Enhanced-Performance Implanted  
CMOS) Submicron Process  
V
CC  
Typical VOLP (Output Ground Bounce)  
< 0.8 V at VCC = 3.3 V, TA = 25°C  
A
B
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
Y0  
Y1  
Y2  
Y3  
Y4  
C
Typical VOHV (Output VOH Undershoot)  
G2A  
G2B  
G1  
> 2 V at VCC = 3.3 V, TA = 25°C  
•
•
Inputs Accept Voltages to 5.5 V  
Package Options Include Plastic  
10 Y5  
Y7  
Small-Outline (D), Shrink Small-Outline (DB),  
and Thin Shrink Small-Outline (PW) Packages  
9
Y6  
GND  
DESCRIPTION  
This 3-line to 8-line decoder/demultiplexer, with latches on three address inputs, is designed for 1.65-V to 3.6-V  
VCC operation.  
The SN74LVC137A is designed for high-performance memory-decoding or data-routing applications requiring  
very short propagation delay times. In high-performance memory systems, this decoder can be used to minimize  
the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the  
delay times of this decoder and the enable time of the memory usually are less than the typical access time of  
the memory. This means that the effective system delay introduced by the decoder is negligible.  
When the latch-enable (G2A) input is low, the SN74LVC137A acts as a decoder/demultiplexer. When G2A  
transitions from low to high, the address present at the inputs (A, B, and C) is stored in the latches. Further  
address changes are ignored, provided G2A remains high. The output-enable (G1 and G2B) inputs control the  
outputs independently of the select or latch-enable inputs. All of the outputs are forced high if G1 is low or G2B is  
high.  
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators  
in a mixed 3.3-V/5-V system environment.  
The SN74LVC137A is characterized for operation from –40°C to 85°C.  
FUNCTION TABLE  
INPUTS  
OUTPUTS  
Y3 Y4  
LATCH  
ENABLE  
OUTPUT  
ENABLE  
SELECT  
G2A  
X
X
L
G1  
G2B  
H
X
L
C
X
X
L
B
X
X
L
A
X
X
L
Y0  
H
H
L
Y1  
H
H
H
L
Y2  
H
H
H
H
L
Y5  
H
H
H
H
H
H
H
L
Y6  
H
H
H
H
H
H
H
H
L
Y7  
H
H
H
H
H
H
H
H
H
L
X
L
H
H
H
H
H
H
L
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
L
L
L
H
L
H
H
H
H
H
H
H
L
L
L
H
H
L
H
H
H
H
H
H
L
L
L
H
L
H
H
H
H
H
L
L
H
H
H
H
X
H
H
H
H
L
L
L
H
L
H
H
H
L
L
H
H
X
H
H
L
L
H
X
H
H
L
Outputs corresponding to stored address = L; all other outputs = H  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
EPIC is a trademark of Texas Instruments.  
PRODUCT PREVIEW information concerns products in the forma-  
Copyright © 1994–2005, Texas Instruments Incorporated  
tive or design phase of development. Characteristic data and other  
specifications are design goals. Texas Instruments reserves the  
right to change or discontinue these products without notice.  
12345678

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