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參數(shù)資料
| 型號： | DM74LS249M |
| 英文描述： | Decoder/Driver |
| 中文描述： | 解碼器/驅動器 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 163K |
| 代理商： | DM74LS249M |
TL/F/6417
5
T
June 1989
54LS257A/DM54LS257B/DM74LS257B,
54LS258A/DM54LS258B/DM74LS258B
TRI-STATE
é
Quad 2-Data Selectors/Multiplexers
General Description
These Schottky-clamped high-performance multiplexers
feature TRI-STATE outputs that can interface directly with
data lines of bus-organized systems. With all but one of the
common outputs disabled (at a high impedance state), the
low impedance of the single enabled output will drive the
bus line to a high or low logic level. To minimize the possibil-
ity that two outputs will attempt to take a common bus to
opposite logic levels, the output enable circuitry is designed
such that the output disable times are shorter than the out-
put enable times.
This TRI-STATE output feature means that n-bit (paralleled)
data selectors with up to 258 sources can be implemented
for data buses. It also permits the use of standard TTL reg-
isters for data retention throughout the system.
Features
Y
TRI-STATE versions LS157 and LS158 with same pin-
outs
Y
Schottky-clamped for significant improvement in A-C
performance
Y
Provides bus interface from multiple sources in high-
performance systems
Y
Average propagation delay from data input 12 ns
Y
Typical power dissipation
LS257B
LS258B
50 mW
35 mW
military/aerospace
Y
Alternate
54LS258A) are available. Contact a National Semicon-
ductor Sales Office/Distributor for specifications.
devices
(54LS257A/
Connection Diagrams
Dual-In-Line Package
TL/F/6417–1
Order Number 54LS257ADMQB, 54LS257AFMQB,
54LS257ALMQB, DM54LS257BJ, DM54LS257BW,
DM74LS257BM or DM74LS257BN
See NS Package Number E20A, J16A,
M16A, N16E or W16A
Dual-In-Line Package
TL/F/6417–2
Order Number 54LS258ADMQB, 54LS258AFMQB,
54LS258ALMQB, DM54LS258BJ, DM54LS258BW,
DM74LS258BM or DM74LS258BN
See NS Package Number E20A, J16A,
M16A, N16E or W16A
Function Table
Inputs
Output Y
Output
Control
Select
A
B
LS257
LS258
H
L
L
L
L
X
L
L
H
H
X
L
H
X
X
X
X
X
L
H
Z
L
H
L
H
Z
H
L
H
L
H
e
High Level, L
e
Low Level, X
e
Don’t Care,
Z
e
High Impedance (off)
TRI-STATE
é
is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
RRD-B30M105/Printed in U. S. A.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DM74LS251 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DM74LS251M | 功能描述:編碼器、解碼器、復用器和解復用器 3-STATE Data Sel/Mul RoHS:否 制造商:Micrel 產品: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| DM74LS251MX | 功能描述:編碼器、解碼器、復用器和解復用器 3-STATE Data Sel/Mul RoHS:否 制造商:Micrel 產品: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| DM74LS251N | 功能描述:編碼器、解碼器、復用器和解復用器 3-STATE Data Sel/Mul RoHS:否 制造商:Micrel 產品: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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| DM74LS253 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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