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SN74AHC138DB PDF预览

SN74AHC138DB

更新时间： 2024-11-23 23:09:39
品牌 Logo 应用领域
德州仪器 - TI 解码器解复用器
页数 文件大小 规格书
9页 132K
描述
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

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SN74AHC138DB 数据手册

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SN54AHC138, SN74AHC138  
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS  
SCLS258I – DECEMBER 1995 – REVISED JANUARY 2000  
SN54AHC138 . . . J OR W PACKAGE  
SN74AHC138 . . . D, DB, DGV, N, OR PW PACKAGE  
(TOP VIEW)  
EPIC (Enhanced-Performance Implanted  
CMOS) Process  
Operating Range 2-V to 5.5-V V  
CC  
A
B
V
CC  
15 Y0  
Designed Specifically for High-Speed  
Memory Decoders and Data-Transmission  
Systems  
1
2
3
4
5
6
7
8
16  
14  
13  
12  
11  
10  
9
C
Y1  
Y2  
Y3  
Y4  
Y5  
Y6  
G2A  
G2B  
G1  
Incorporate Three Enable Inputs to Simplify  
Cascading and/or Data Reception  
Latch-Up Performance Exceeds 250 mA Per  
JESD 17  
Y7  
GND  
ESD Protection Exceeds 2000 V Per  
MIL-STD-833, Method 3015; Exceeds 200 V  
Using Machine Model (C = 200 pF, R = 0)  
SN54AHC138 . . . FK PACKAGE  
(TOP VIEW)  
Package Options Include Plastic  
Small-Outline (D), Shrink Small-Outline  
(DB), Thin Very Small-Outline (DGV), Thin  
Shrink Small-Outline (PW), and Ceramic  
Flat (W) Packages, Ceramic Chip  
Carriers (FK), and Standard Plastic (N) and  
Ceramic (J) DIPs  
3
2
1 20 19  
18  
Y1  
C
G2A  
NC  
4
5
6
7
8
17 Y2  
16  
NC  
15  
Y3  
G2B  
G1  
description  
14  
Y4  
9 10 11 12 13  
The ’AHC138 decoders/demultiplexers are  
designed for high-performance memory-decoding  
and data-routing applications that require very  
NC – No internal connection  
short  
propagation-delay  
times.  
In  
high-performance memory systems, these  
decoders 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 these decoders and the  
enable time of the memory are usually less than  
thetypicalaccesstimeofthememory. Thismeans  
that the effective system delay introduced by the  
decoders is negligible.  
The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two  
active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding.  
A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one  
inverter. An enable input can be used as a data input for demultiplexing applications.  
TheSN54AHC138 is characterized for operation over the full military temperature range of –55°C to 125°C. The  
SN74AHC138 is characterized for operation from –40°C to 85°C.  
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 Incorporated.  
Copyright 2000, Texas Instruments Incorporated  
On products compliant to MIL-PRF-38535, all parameters are tested  
unless otherwise noted. On all other products, production  
processing does not necessarily include testing of all parameters.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...9

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SN74AHC138DBR TI

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SN74AHC138DBRE4 TI

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SN74AHC138DBRG4 TI

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SN74AHC138DE4 TI

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SN74AHC138DG4 TI

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SN74AHC138DGV TI

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 		3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SN74AHC138DGVR TI

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 		3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SN74AHC138DGVRE4 TI

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 		AHC/VHC/H/U/V SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, PDSO16, GREEN, PLASTIC, TVSOP
SN74AHC138DR TI

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 		3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

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