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參數(shù)資料
| 型號(hào)： | DM74ALS257 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer(四2選1線(xiàn)數(shù)據(jù)選擇器/多路復(fù)用器（三態(tài)輸出）) |
| 中文描述： | 三態(tài)四1 - 2 -線(xiàn)數(shù)據(jù)選擇器/多路（四2選1線(xiàn)數(shù)據(jù)選擇器/多路復(fù)用器（三態(tài)輸出）） |
| 文件頁(yè)數(shù)： | 1/7頁(yè) |
| 文件大小： | 74K |
| 代理商： | DM74ALS257 |
2000 Fairchild Semiconductor Corporation
DS006227
www.fairchildsemi.com
April 1984
Revised February 2000
D
DM74ALS257 DM74ALS258
3-STATE Quad 1-of-2-Line Data Selector/Multiplexer
General Description
These data selectors/multiplexers contain inverters and
drivers to supply full on-chip data selection to the four 3-
STATE outputs that can interface directly with data lines of
bus-organized systems. A 4-bit word selected from one of
two sources is routed to the four outputs. The
DM74ALS257
presents
true
DM74ALS258 presents inverted data to minimize propaga-
tion delay time.
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.
data
whereas
the
Features
I
Switching specifications at 50 pF
I
Switching specifications guaranteed over full tempera-
ture and V
CC
range
I
Advanced oxide-isolated, ion-implanted Schottky TTL
process
I
Functionally and pin for pin compatible with Schottky
and low power Schottky TTL counterpart
I
Improved AC performance over Schottky and low power
Schottky counterparts
I
3-STATE buffer-type outputs drive bus lines directly
I
Expand any data input point
I
Multiplex dual data buses
I
General four functions of two variables (one variable is
common)
I
Source programmable counters
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)
Order Number
DM74ALS257M
DM74ALS257SJ
DM74ALS257N
DM74ALS258M
DM74ALS258N
Package Number
M16A
M16D
N16E
M16A
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
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
DM74ALS257 DM74ALS258
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DM74ALS257M | 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer |
| DM74ALS257N | 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer |
| DM74ALS257SJ | 10-Bit Bus-Interface Flip-Flop With 3-State Outputs 24-TSSOP -40 to 85 |
| DM74ALS258M | 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer |
| DM74ALS258N | 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DM74ALS257J/A+ | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:2-Input Digital Multiplexer |
| DM74ALS257M | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 3-STATE Data Sel/Mul RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線(xiàn)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 |
| DM74ALS257M/A+ | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:2-Input Digital Multiplexer |
| DM74ALS257M/B+ | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:2-Input Digital Multiplexer |
| DM74ALS257M_Q | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 3-STATE Data Sel/Mul RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線(xiàn)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 |
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