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參數(shù)資料
| 型號(hào)： | SN74LS138N |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 通用總線功能 |
| 英文描述： | 1-OF-8 DECODER/ DEMULTIPLEXER |
| 中文描述： | LS SERIES, OTHER DECODER/DRIVER, INVERTED OUTPUT, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 2/5頁(yè) |
| 文件大?。?/td> | 185K |
| 代理商： | SN74LS138N |
5-231
FAST AND LS TTL DATA
SN54/74LS138
FUNCTIONAL DESCRIPTION
The LS138 is a high speed 1-of-8 Decoder/Demultiplexer
fabricated with the low power Schottky barrier diode process.
The decoder accepts three binary weighted inputs (A0, A1, A2)
and when enabled provides eight mutually exclusive active
LOW Outputs (O0–O7). The LS138 features three Enable in-
puts, two active LOW (E1, E2) and one active HIGH (E3). All
outputs will be HIGH unless E1 and E2 are LOW and E3 is
HIGH. This multiple enable function allows easy parallel ex-
pansion of the device to a 1-of-32 (5 lines to 32 lines) decoder
with just four LS138s and one inverter. (See Figure a.)
The LS138 can be used as an 8-output demultiplexer by
using one of the active LOW Enable inputs as the data input
and the other Enable inputs as strobes. The Enable inputs
which are not used must be permanently tied to their appropri-
ate active HIGH or active LOW state.
TRUTH TABLE
INPUTS
OUTPUTS
E1
H
X
X
L
L
L
L
L
L
L
L
E2
X
H
X
L
L
L
L
L
L
L
L
E3
X
X
L
H
H
H
H
H
H
H
H
A0
X
X
X
L
H
L
H
L
H
L
H
A1
X
X
X
L
L
H
H
L
L
H
H
A2
X
X
X
L
L
L
L
H
H
H
H
O0
H
H
H
L
H
H
H
H
H
H
H
O1
H
H
H
H
L
H
H
H
H
H
H
O2
H
H
H
H
H
L
H
H
H
H
H
O3
H
H
H
H
H
H
L
H
H
H
H
O4
H
H
H
H
H
H
H
L
H
H
H
O5
H
H
H
H
H
H
H
H
L
H
H
O6
H
H
H
H
H
H
H
H
H
L
H
O7
H
H
H
H
H
H
H
H
H
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
LS138
LS138
LS138
LS138
Figure a
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SN74LS138 | LOW POWER SCHOTTKY |
| SN74LS138D | LOW POWER SCHOTTKY |
| SN74LS138N | LOW POWER SCHOTTKY |
| SN74LS139 | LOW POWER SCHOTTKY |
| SN74LS139D | LOW POWER SCHOTTKY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SN74LS138N | 制造商:Texas Instruments 功能描述:IC 74LS 74LS138 DIP16 5.25V |
| SN74LS138N | 制造商:Texas Instruments 功能描述:IC 74LS 74LS138 DIP16 5.25V |
| SN74LS138N3 | 制造商:Texas Instruments 功能描述: |
| SN74LS138NE4 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 3-line to 8-line Decoder/Demltplxr RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS138NMOT88 | 制造商:Motorola 功能描述:74LS138N |
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