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SN74ACT7804-40DL データシート(PDF) 2 Page - Texas Instruments

部品番号 SN74ACT7804-40DL
部品情報  512 횞 18 STROBED FIRST-IN, FIRST-OUT MEMORY
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

SN74ACT7804-40DL データシート(HTML) 2 Page - Texas Instruments

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SN74ACT7804
512
× 18 STROBED FIRST-IN, FIRST-OUT MEMORY
SCAS204C – APRIL 1992 – REVISED APRIL 1998
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
A low level on the reset (RESET) input resets the internal stack pointers and sets FULL high, AF/AE high, HF
low, and EMPTY low. The Q outputs are not reset to any specific logic level. The FIFO must be reset upon
power up.
The first word loaded into empty memory causes EMPTY to go high and the data to appear on the Q outputs.
It is important to note that the first word does not have to be unloaded. The data outputs are noninverting with
respect to the data inputs and are in the high-impedance state when the output-enable (OE) input is high.
The SN74ACT7804 is characterized for operation from 0
°C to 70°C.
logic symbol
0
21
D0
20
D1
19
D2
18
D3
17
D4
16
D5
15
D6
14
D7
12
D8
Q0
33
0
Q1
34
Q2
36
Q3
37
Q4
38
28
FULL
HF
22
HALF-FULL
AF/AE
24
ALMOST FULL/EMPTY
29
EMPTY
Q5
40
Q6
41
Q7
42
Q8
43
Data
1
Φ
FIFO 512
× 18
SN74ACT7804
11
D9
9
D10
8
D11
7
D12
6
D13
5
D14
4
D15
3
D16
17
2
D17
Q9
45
Q10
46
Q11
47
Q12
48
Q13
49
Q14
51
Q15
53
Q16
54
Q17
55
17
RESET
OE
PEN
RESET
1
25
LDCK
LDCK
Data
PROGRAM ENABLE
23
EN1
56
32
UNCK
UNCK
FULL
EMPTY
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.


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