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参数资料
| 型号： | SN54F138FK |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 编、解码器及复用、解复用 |
| 英文描述： | F/FAST SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, CQCC20 |
| 封装： | CERAMIC, CC-20 |
| 文件页数： | 7/8页 |
| 文件大小： | 163K |
| 代理商： | SN54F138FK |
PRODUCT FOLDER | PRODUCT INFO: FEATURES | DESCRIPTION | DATASHEETS | PRICING/AVAILABILITY | APPLICATION NOTES |
PRODUCT SUPPORT: TRAINING
SN54F138, 3-Line To 8-Line Decoders/Demultiplexers
DEVICE STATUS: ACTIVE
PARAMETER NAME SN54F138 SN74F138
Voltage Nodes (V) 5
5
Vcc range (V)
4.5 to 5.5 4.5 to 5.5
Input Level
TTL
Output Level
TTL
Output Drive (mA)
-1/20
Output
2S
From
3
To
8
FEATURES
Designed Specifically for High-Speed Memory Decoders and Data Transmission Systems
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Incorporates Three Enable Inputs to Simplify Cascading and/or Data Reception
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Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic
300-mil DIPs
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DESCRIPTION
The F138 is designed to be used in high-performance memory-decoding or data-routing applications requiring very 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 this decoder
and the enable time of the memory are usually less than the typical access time of the memory. This means that the
effective system delay introduced by the decoder 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.
The SN54F138 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74F138 is
characterized for operation from 0°C to 70°C.
TECHNICAL DOCUMENTS
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DATASHEET
Full datasheet in Zipped PostScript: sdfs051b.psz (82 KB)
APPLICATION NOTES
View Application Reports for Digital Logic
Bus-Interface Devices With Output-Damping Resistors Or Reduced-Drive Outputs (SCBA012A - Updated: 08/01/1997)
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Product Folder:SN54F138, 3-Line To 8-Line Decoders/Demultiplexers
file:///J|/imaging/BITTING/mail_pdf/2000/sn54f138.html (1 of 2) [9/5/2001 6:05:03 PM]
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All Semiconductors
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