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SN74ACT7805DL Datenblatt(PDF) 10 Page - Texas Instruments

Teilenummer SN74ACT7805DL
Bauteilbeschribung  256 횞 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
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Hersteller  TI [Texas Instruments]
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SN74ACT7805
256
× 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SCAS201B – MARCH 1991 – REVISED APRIL 1998
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing requirements over recommended operating conditions (unless otherwise noted) (see
Figures 1 through 5)
’ACT7805-15
’ACT7805-20
’ACT7805-25
’ACT7805-40
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
fclock
Clock frequency
67
50
40
25
MHz
WRTCLK high or low
6
7
8
12
tw
Pulse duration
RDCLK high or low
6
7
8
12
ns
PEN low
8
9
9
12
D0–D17 before WRTCLK
4
5
5
5
WRTEN1, WRTEN2
before WRTCLK
4
5
5
5
OE1, OE2 before RDCLK
5
5
6
6
tsu
Setup time
RDEN before RDCLK
4
5
5
5
ns
tsu
Setu time
Reset: RESET low before first
WRTCLK
↑ and RDCLK↑†
5
6
6
6
ns
PEN before WRTCLK
5
6
6
6
Define AF/AE: PEN
before WRTCLK
5
6
6
6
D0–D17) after WRTCLK
0
0
0
0
WRTEN1, WRTEN2
after WRTCLK
0
0
0
0
th
Hold time
OE1, OE2, RDEN after RDCLK
0
0
0
0
ns
th
Hold time
Reset: RESET low after fourth
WRTCLK
↑ and RDCLK↑†
2
2
2
2
ns
Define AF/AE: PEN
after WRTCLK
2
2
2
2
† 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
’ACT7805-15
’ACT7805-20
’ACT7805-25
’ACT7805-40
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
4
9.5
12
4
13
4
15
4
20
ns
tpd‡
RDCLK
Any Q
8.5
ns
WRTCLK
IR
3
8.5
3
11
3
13
3
15
t d
RDCLK
OR
3
8.5
3
11
3
13
3
15
ns
tpd
WRTCLK
AF/AE
7
16.5
7
19
7
21
7
23
ns
RDCLK
AF/AE
7
17
7
19
7
21
7
23
tPLH
WRTCLK
HF
7
15
7
17
7
19
7
21
ns
tPHL
RDCLK
HF
7
15.5
7
18
7
20
7
22
ns
tPLH
RESET low
AF/AE
2
9
2
11
2
13
2
15
ns
tPHL
RESET low
HF
2
10
2
12
2
14
2
16
ns
ten
OE1, OE2
Any Q
2
8.5
2
11
2
11
2
11
ns
tdis
OE1, OE2
Any Q
2
9.5
2
11
2
14
2
14
ns
‡ This parameter is measured with a 30-pF load (see Figure 6).


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