參數(shù)資料
型號(hào): 74HC259
廠商: NXP Semiconductors N.V.
英文描述: 8-bit addressable latch
中文描述: 8位可尋址鎖存器
文件頁(yè)數(shù): 5/11頁(yè)
文件大?。?/td> 87K
代理商: 74HC259
December 1990
5
Philips Semiconductors
Product specification
8-bit addressable latch
74HC/HCT259
FUNCTION TABLE
Notes
1.
H = HIGH voltage level
L = LOW voltage level
X = don’t care
d = HIGH or LOW data one set-up time prior to the LOW-to-HIGH LE transition
q = lower case letters indicate the state of the referenced output established during the last cycle in which it was
addressed or cleared
OPERATING
MODES
INPUTS
OUTPUTS
MR
LE
D
A
0
X
L
H
L
H
A
1
X
L
L
H
H
A
2
X
L
L
L
L
Q
0
Q
1
Q
2
Q
3
Q
4
Q
5
Q
6
Q
7
master reset
L
L
L
L
L
H
L
L
L
L
X
d
d
d
d
L
Q=d
L
L
L
L
L
Q=d
L
L
L
L
L
Q=d
L
L
L
L
L
Q=d
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
demultiplex
(active HIGH)
decoder
(when D = H)
L
L
L
L
H
H
H
H
H
L
L
L
L
H
L
L
L
L
d
d
d
d
X
d
d
d
d
L
H
L
H
X
L
H
L
H
L
L
H
H
X
L
L
H
H
H
H
H
H
X
L
L
L
L
L
L
L
L
q
0
Q=d
q
0
q
0
q
0
L
L
L
L
q
1
q
1
Q=d
q
1
q
1
L
L
L
L
q
2
q
2
q
2
Q=d
q
2
L
L
L
L
q
3
q
3
q
3
q
3
Q=d
Q=d
L
L
L
q
4
q
4
q
4
q
4
q
4
L
Q=d
L
L
q
5
q
5
q
5
q
5
q
5
L
L
Q=d
L
q
6
q
6
q
6
q
6
q
6
L
L
L
Q=d
q
7
q
7
q
7
q
7
q
7
store (do nothing)
addressable latch
H
H
H
H
L
L
L
L
d
d
d
d
L
H
L
H
L
L
H
H
H
H
H
H
q
0
q
0
q
0
q
0
q
1
q
1
q
1
q
1
q
2
q
2
q
2
q
2
q
3
q
3
q
3
q
3
Q=d
q
4
q
4
q
4
q
5
Q=d
q
5
q
5
q
6
q
6
Q=d
q
6
q
7
q
7
q
7
Q=d
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