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參數(shù)資料
| 型號： | MC74ACT256N |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | DUAL 4-BIT ADDRESSABLE LATCH |
| 中文描述： | ACT SERIES, LOW LEVEL TRIGGERED D LATCH, TRUE OUTPUT, PDIP16 |
| 封裝： | 648-08 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 232K |
| 代理商： | MC74ACT256N |
5-1
FACT DATA
The MC74AC256/74ACT256 dual addressable latch has four distinct modes
of operation which are selectable by controlling the Clear and Enable inputs
(see Function Table). In the addressable latch mode, data at the Data (D) inputs
is written into the addressed latches. The addressed latches will follow the Data
input with all unaddressed latches remaining in their previous states.
In the memory mode, all latches remain in their previous states and are
unaffected by the Data or Address inputs. To eliminate the possibility of entering
erroneous data in the latches, the enable should be held HIGH (inactive) while
the address lines are changing. In the dual 1-of-4 decoding or demultiplexing
mode (MR = E = LOW), addressed outputs will follow the level of the D inputs
with all other outputs LOW. In the clear mode, all outputs are LOW and unaffected
by the Address and Data inputs.
Combines Dual Demultiplexer and 8-Bit Latch
Serial-to-Parallel Capability
Output from Each Storage Bit Available
Random (Addressable) Data Entry
Easily Expandable
Common Clear Input
Useful as Dual 1-of-4 Active HIGH Decoder
15
16
14
13
12
11
10
2
1
3
4
5
6
7
VCC
9
8
MR
E
Db
Q3b
Q2b
Q1b
Q0b
A0
A1
Da
Q0a
Q1a
Q2a
Q3a
GND
DUAL 4-BIT
ADDRESSABLE
LATCH
N SUFFIX
CASE 648-08
PLASTIC
D SUFFIX
CASE 751B-05
PLASTIC
LOGIC SYMBOL
Da
Db
A0
A1
Q0aQ1aQ2aQ3aQ0bQ1bQ2bQ3b
E
MR
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| MC74AC257D | QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
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| MC74ACT257 | QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
| MC74AC257N | QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC74ACT257 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
| MC74ACT257D | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 5V Dual 4-Input 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 |
| MC74ACT257DG | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 5V Dual 4-Input w/3-State Out 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 |
| MC74ACT257DR2 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 5V Dual 4-Input 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 |
| MC74ACT257DR2G | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 5V Dual 4-Input w/3-State Out 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 |
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