74F821 Ver la hoja de datos (PDF) - Philips Electronics
Número de pieza
componentes Descripción
Lista de partido
74F821 Datasheet PDF : 18 Pages
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Philips Semiconductors
Bus interface registers
Product specification
74F821/822/823/824/825/826
LOGIC DIAGRAM FOR 74F822
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
2
3
4
5
6
7
8
9
10
11
CP 13
OE 1
VCC = Pin 24
GND = Pin 12
D
CP Q
D
CP Q
D
CP Q
D
CP Q
D
CP Q
D
CP Q
D
CP Q
D
CP Q
D
CP Q
D
CP Q
23
Q0
22
Q1
21
Q2
20
Q3
19
Q4
18
Q5
17
Q6
16
Q7
15
Q8
14
Q9
SF00501
FUNCTION TABLE FOR 74F821 AND 74F822
INPUTS
OUTPUTS
74F821
74F822
OE
CP
Dn
Q
Q
L
↑
l
L
H
L
↑
h
H
L
L
↑
X
NC
NC
H
X
X
Z
Z
H=
h=
L=
l=
NC=
X=
Z=
↑=
↑=
High-voltage level
High state must be present one setup time before the low-to-high clock transition
Low-voltage level
Low state must be present one setup time before the low-to-high clock transition
No change
Don’t care
High impedance “off” state
Low-to-high clock transition
Not low-to-high clock transition
OPERATING MODE
Load and read data
Hold
High impedance
LOGIC DIAGRAM FOR 74F823
14
CE
13
CP
MR 11
D0
D1
2
3
D CP
RQ
D CP
RQ
D2
4
D CP
RQ
D3
5
D CP
RQ
D4
D5
6
7
D CP
RQ
D CP
RQ
D6
D7
D8
8
9
10
D CP
RQ
D CP
RQ
D CP
RQ
VCC = Pin 24
GND = Pin 12
1
OE
23
Q0
22
Q1
21
Q2
20
Q3
19
Q4
18
Q5
17
Q6
16
Q7
15
Q8
SF00502A
1996 Jan 05
7
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