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SN74ACT7807PAG Scheda tecnica(PDF) 11 Page - Texas Instruments

Il numero della parte SN74ACT7807PAG
Spiegazioni elettronici  2048 횞 9 CLOCKED FIRST-IN, FIRST-OUT MEMORY
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

SN74ACT7807PAG Scheda tecnica(HTML) 11 Page - Texas Instruments

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SN74ACT7807
2048
× 9
CLOCKED FIRST-IN, FIRST-OUT MEMORY
SCAS200D – JANUARY 1991 – REVISED APRIL 1998
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing requirements over recommended operating free-air temperature range (unless otherwise
noted) (see Figures 1 through 5)
’ACT7807-15
’ACT7807-20
’ACT7807-25
’ACT7807-40
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
fclock
Clock frequency
67
50
40
25
MHz
WRTCLK high or low
6
8
9
13
tw
Pulse duration
RDCLK high or low
6
8
9
13
ns
PEN low
6
9
9
13
D0–D8 before WRTCLK
4
5
5
5
WRTEN1, WRTEN2
before WRTCLK
4
5
5
5
tsu
Setup time
OE, RDEN1, RDEN2
before RDCLK
5
6
6
6.5
ns
Reset: RESET low before
first WRTCLK
↑ and RDCLK↑†
7
8
8
8
PEN before WRTCLK
4
5
5
5
D0–D8 after WRTCLK
0
0
0
0
WRTEN1, WRTEN2
after WRTCLK
0
0
0
0
th
Hold time
OE, RDEN1, RDEN2
after RDCLK
0
0
0
0
ns
h
Reset: RESET low after
fourth WRTCLK
↑ and RDCLK↑†
5
5
5
5
PEN high after WRTCLK
0
0
0
0
PEN low after WRTCLK
3
3
3
3
† To permit the clock pulse to be utilized for reset purposes
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, CL = 50 pF (unless otherwise noted) (see Figure 5)
PARAMETER
FROM
TO
’ACT7807-15
’ACT7807-20
’ACT7807-25
’ACT7807-40
UNIT
PARAMETER
(INPUT)
(OUTPUT)
MIN
TYP‡
MAX
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
fmax
WRTCLK or
RDCLK
67
50
40
25
MHz
tpd
RDCLK
Any Q
3
9
12
3
13
3
18
3
25
ns
tpd§
RDCLK
Any Q
8
ns
WRTCLK
IR
1
9
1
12
1
14
1
16
t d
RDCLK
OR
1
9
2
12
2
14
2
16
ns
tpd
WRTCLK
AF/AE
2
16
2
20
2
25
2
30
ns
RDCLK
AF/AE
2
17
2
20
2
25
2
30
tPLH
WRTCLK
HF
2
19
2
21
2
23
2
25
ns
tPHL
RDCLK
HF
2
16
2
18
2
20
2
22
ns
tPLH
RESET low
AF/AE
1
12
1
18
1
22
1
24
ns
tPHL
RESET low
HF
2
12
2
18
2
22
2
24
ns
ten
OE
Any Q
2
10
2
13
2
15
2
18
ns
tdis
OE
Any Q
1
11
1
13
1
15
1
18
ns
‡ All typical values are at VCC = 5 V, TA = 25°C.
§ This parameter is measured with CL = 30 pF (see Figure 6).


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