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SN74ACT7808PAG bảng dữ liệu(PDF) 9 Page - Texas Instruments

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SN74ACT7808PAG bảng dữ liệu(HTML) 9 Page - Texas Instruments

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SN74ACT7808
2048
× 9 STROBED FIRST-IN, FIRST-OUT MEMORY
SCAS205D – FEBRUARY 1991 – REVISED APRIL 1998
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing requirements over recommended operating conditions (unless otherwise noted) (see
Figures 1 through 3)
’ACT7808-20
’ACT7808-25
’ACT7808-30
’ACT7808-40
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
fclock
Clock frequency
50
40
33.3
25
MHz
LDCK high or low
8
9
11
13
t
Pulse duration
UNCK high or low
8
9
11
13
ns
tw
Pulse duration
PEN low
9
9
11
13
ns
RESET low
10
13
16
19
D0–D8, DP9 before LDCK
5
5
5
5
tsu
Setup time
LDCK inactive
before RESET high
5
5
5
5
ns
PEN before LDCK
5
5
5
5
D0–D8, DP9 after LDCK
0
0
0
0
th
Hold time
LDCK inactive
after RESET high
5
5
5
5
ns
h
PEN low after LDCK
4
4
4
4
PEN high after LDCK low
0
0
0
0
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, CL = 50 pF (unless otherwise noted) (see Figure 3)
PARAMETER
FROM
TO
’ACT7808-20
’ACT7808-25
’ACT7808-30
’ACT7808-40
UNIT
PARAMETER
(INPUT)
(OUTPUT)
MIN
TYP†
MAX
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
fmax
LDCK or UNCK
50
40
33.3
25
MHz
t
LDCK
Any Q
5
20
5
22
5
25
5
28
ns
tpd
UNCK
Any Q
4.5
11
15
4.5
18
4.5
20
4.5
22
ns
tpd‡
UNCK
Any Q
10
ns
tPLH
LDCK
EMPTY
4
15
4
17
4
19
4
21
ns
UNCK
EMPTY
2
15
2
17
2
19
2
21
tPHL
RESET low
EMPTY
2
16
2
18
2
20
2
22
ns
PHL
LDCK
FULL
4
15
4
17
4
19
4
21
tPLH
UNCK
FULL
4
14
4
16
4
18
4
20
ns
tPLH
RESET low
FULL
2
18
2
20
2
22
2
24
ns
t d
LDCK
AF/AE
2
16
2
18
2
20
2
22
ns
tpd
UNCK
AF/AE
2
16
2
18
2
20
2
22
ns
tPLH
RESET low
AF/AE
0
10
0
12
0
14
0
16
ns
tPLH
LDCK
HF
2
19
2
21
2
23
2
25
ns
tPHL
UNCK
HF
2
16
2
18
2
20
2
22
ns
tPHL
RESET low
HF
2
12
2
14
2
16
2
18
ns
tPLH
UNCK
XO
2
11
2
13
2
15
2
17
ns
tPHL
LDCK
XO
2
11
2
13
2
15
2
17
ns
ten
OE
Any Q
1
10
1
12
1
14
1
16
ns
tdis
OE
Any Q
1
9
1
11
1
13
1
15
ns
ten
XI high
Any Q
3
13
3
15
3
17
3
19
ns
tdis
XO high
Any Q
4
4
4
4
ns
† All typical values are at VCC = 5 V, TA = 25°C.
‡ This parameter is measured with CL = 30 pF (see Figure 4).


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