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| 型號： | DM74LS257BN |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | 3-STATE Quad 2-Data Selectors/Multiplexers |
| 中文描述： | LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001, DIP-16 |
| 文件頁數(shù)： | 1/5頁 |
| 文件大小： | 56K |
| 代理商： | DM74LS257BN |
1999 Fairchild Semiconductor Corporation
DS006417
www.fairchildsemi.com
June 1989
Revised November 1999
D
DM74LS257B
3-STATE Quad 2-Data Selectors/Multiplexers
General Description
These Schottky-clamped high-performance multiplexers
feature 3-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 pos-
sibility 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 output enable times.
This 3-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
I
3-STATE versions LS157 and LS158 with same pinouts
I
Schottky-clamped for significant improvement in A-C
performance
I
Provides bus interface from multiple sources in
high-performance systems
I
Average propagation delay from data input 12 ns
I
Typical power dissipation:
50 mW
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
H
=
HIGH Level
L
=
LOW Level
X
=
Don’t Care
Z
=
High Impedance (off)
Logic Diagram
Order Number
DM74LS257BM
DM74LS257BN
Package Number
M16A
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs
Output Y
Output
Control
H
L
L
L
L
Select
A
B
LS257
X
L
L
H
H
X
L
H
X
X
X
X
X
L
H
Z
L
H
L
H
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DM74LS257 | 3-STATE Quad 2-Data Selectors/Multiplexers |
| DM74LS257BMX | 2-Input Digital Multiplexer |
| DM74LS259WM | 8-Bit Addressable Latches |
| DM74LS259 | 8-Bit Addressable Latches(8位可尋址的緩沖器) |
| DM74LS259M | 8-Bit Addressable Latches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DM74LS257N | 制造商:Texas Instruments 功能描述: 制造商:National Semiconductor Corporation 功能描述:LOGIC MUX, QUAD, 2-INPUT, LS-TTL, 16 Pin, Plastic, DIP |
| DM74LS258BM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| DM74LS259 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DM74LS259M | 功能描述:閉鎖 8-Bit Serial 閉鎖 RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel |
| DM74LS259MX | 功能描述:閉鎖 8-Bit Serial 閉鎖 RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel |
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