參數(shù)資料
型號: 74F1604
廠商: NXP Semiconductors N.V.
英文描述: Latch
中文描述: 鎖存
文件頁數(shù): 3/10頁
文件大小: 92K
代理商: 74F1604
Philips Semiconductors
Product specification
74F1604
Latch
October 4, 1990
3
LOGIC DIAGRAM
9
10
5
6
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
V
= Pin 28
GND = Pin 14
D
E
Q
Q
15
A0
B0
D
E
3
4
D
E
Q
Q
13
A1
B1
D
E
D
E
Q
Q
12
A2
B2
D
E
7
8
D
E
Q
Q
11
A3
B3
D
E
D
E
Q
Q
16
A4
B4
D
E
27
26
D
E
Q
Q
17
A5
B5
D
E
25
24
D
E
Q
Q
18
A6
B6
D
E
23
22
D
E
Q
Q
19
A7
B7
D
E
21
20
2
1
SELECT A/B
LE
SF00556
FUNCTION TABLE
INPUTS
OUTPUTS
OUTPUTS
OPERATING MODE
A0 – A7
B0 –B7
SELECT A/B
LE
Q0 – Q7
A data
B data
L
L
B data
Enable and read register
A data
B data
H
L
A data
X
X
X
H
NC
Hold
A data
B data
l
B data
Latch and read register
A data
B data
h
A data
Notes to function table
H =
High–voltage level
h
=
High–voltage level one setup time before the low–to–high latch enable transition
L
=
Low–voltage level
l
=
Low–voltage level one setup time before the low–to–high latch enable transition
NC=
No change ( If SELECT A/B is toggled and the A latched data is different from B latched data then the output will change accordingly.)
X =
Don’t care
=
Low–to–high latch enable transition
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