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參數(shù)資料
| 型號： | 74AC259 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 8−Bit Addressable Latch |
| 文件頁數(shù)： | 2/11頁 |
| 文件大?。?/td> | 130K |
| 代理商： | 74AC259 |
MC74AC259, MC74ACT259
http://onsemi.com
2
MODE SELECTFUNCTION TABLE
Operating
Mode
Inputs
Outputs
MR
E
D
A
0
A
1
A
2
Q
0
Q
1
Q
2
Q
3
Q
4
Q
5
Q
6
Q
7
Master Reset
L
H
X
X
X
X
L
L
L
L
L
L
L
L
Demultiplex
(Active HIGH
Decoder when
D = H)
L
L
L
L
L
L
L
L
d
d
d
d
L
H
L
H
L
L
H
H
L
L
L
H
Q = d
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
Q = d
L
L
Q = d
L
Q = d
Store
(Do Nothing)
H
H
X
X
X
X
q
0
q
1
q
2
q
3
q
4
q
5
q
6
q
7
Addressable
Latch
H
H
H
H
L
L
L
L
d
d
d
d
L
H
L
H
L
L
H
H
L
L
L
H
Q = d
q
0
q
0
q
0
q
1
q
2
q
2
q
3
q
3
q
3
q
3
q
4
q
4
q
4
q
4
q
5
q
5
q
5
q
5
q
6
q
6
q
6
q
6
q
7
q
7
q
7
Q = d
q
1
q
1
Q = d
q
2
Q = d
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
d = HIGH or LOW Data one setup time prior to the LOWtoHIGH Enable transition
q = Lower case letters indicate the state of the referenced output established during the last cycle in which it was addressed
or cleared.
FUNCTIONAL DESCRIPTION
The MC74AC259/74ACT259 has four modes of
operation as shown in the Mode Selection Table. In the
addressable latch mode, data on the Data line (D) is written
into the addressed latch. The addressed latch will follow the
data input with all nonaddressed latches remaining in their
previous states in the memory mode. All latches remain in
their previous state and are unaffected by the Data or
Address inputs.
In
the oneofeight decoding or demultiplexing mode, the
addressed output will follow the state of the D input with all
other outputs in the LOW state. In the clear mode all outputs
are LOW and unaffected by the address and data inputs.
When operating the MC74AC/ACT259 as an addressable
latch, changing more than one bit of the address could
impose a transient wrong address. Therefore, this should
only be done while in the memory mode. The Mode Select
Function Table summarizes the operations of the
MC74AC/ACT259.
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| 74AC273DW | 制造商:Motorola Inc 功能描述: |
| 74AC273M | 功能描述:觸發(fā)器 RO 511-74AC273M-TR RoHS:否 制造商:Texas Instruments 電路數(shù)量:2 邏輯系列:SN74 邏輯類型:D-Type Flip-Flop 極性:Inverting, Non-Inverting 輸入類型:CMOS 輸出類型: 傳播延遲時間:4.4 ns 高電平輸出電流:- 16 mA 低電平輸出電流:16 mA 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:X2SON-8 封裝:Reel |
| 74AC273MTC | 功能描述:觸發(fā)器 Oct D-Type Flip-Flop RoHS:否 制造商:Texas Instruments 電路數(shù)量:2 邏輯系列:SN74 邏輯類型:D-Type Flip-Flop 極性:Inverting, Non-Inverting 輸入類型:CMOS 輸出類型: 傳播延遲時間:4.4 ns 高電平輸出電流:- 16 mA 低電平輸出電流:16 mA 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:X2SON-8 封裝:Reel |
| 74AC273MTC | 制造商:Fairchild Semiconductor Corporation 功能描述:FLIP FLOP LOGIC IC |
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