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參數(shù)資料
| 型號： | SN74LS253N |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
| 中文描述： | LS SERIES, DUAL 4 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 2/5頁 |
| 文件大?。?/td> | 166K |
| 代理商： | SN74LS253N |
5-417
FAST AND LS TTL DATA
SN54/74LS253
LOGIC DIAGRAM
FUNCTIONAL DESCRIPTION
The LS253 contains two identical 4-Input Multiplexers with
3-state outputs. They select two bits from four sources
selected by common select inputs (S0, S1). The 4-input
multiplexers have individual Output Enable (E0a, E0b) inputs
which when HIGH, forces the outputs to a high impedance
(high Z) state.
The LS253 is the logic implementation of a 2-pole,
4-position switch, where the position of the switch is deter-
mined by the logic levels supplied to the two select inputs. The
logic equations for the outputs are shown below:
Za = E0a
(I0a
S1
S0 + I1a
S1
S0
I2a
S1
S0 + I3a
S1
S0)
Zb = E0b
(I0b
S1
S0 + I1b
S1
S0
I2b
S1
S0 + I3b
S1
S0)
If the outputs of 3-state devices are tied together, all but one
device must be in the high impedance state to avoid high
currents that would exceed the maximum ratings. Designers
should ensure that Output Enable signals to 3-state devices
whose outputs are tied together are designed so that there is
no overlap.
TRUTH TABLE
SELECT
INPUTS
DATA INPUTS
OUTPUT
ENABLE
OUTPUT
S0
X
L
L
H
H
L
L
H
H
S1
X
L
L
L
L
H
H
H
H
I0
X
L
H
X
X
X
X
X
X
I1
X
X
X
L
H
X
X
X
X
I2
X
X
X
X
X
L
H
X
X
I3
X
X
X
X
X
X
X
L
H
E0
H
L
L
L
L
L
L
L
L
Z
(Z)
L
H
L
H
L
H
L
H
H = HIGH Level
L = LOW Level
X = Irrelevant
(Z) = High Impedance (off)
Address inputs S0 and S1 are common to both sections.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SN74LS253NE4 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Dual 4-to-1 Data Slct/Mltpx W/3St Otp 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 |
| SN74LS253NMOT87 | 制造商:Motorola 功能描述:74LS253N |
| SN74LS253NS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| SN74LS253NSR | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Dual 4-to-1 Data Slct/Mltpx W/3St Otp 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 |
| SN74LS253NSRE4 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 Dual 4-to-1 Data Slct/Mltpx W/3St Otp 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 |
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