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SN74ACT7802-25FN Arkusz danych(PDF) 2 Page - Texas Instruments

Numer części SN74ACT7802-25FN
Szczegółowy opis  1024 횞 18 STROBED FIRST-IN, FIRST-OUT MEMORY
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

SN74ACT7802-25FN Arkusz danych(HTML) 2 Page - Texas Instruments

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SN74ACT7802
1024
× 18 STROBED FIRST-IN, FIRST-OUT MEMORY
SCAS187D – AUGUST 1990 – REVISED APRIL 1998
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
22 23
VCC
VCC
NC
Q3
Q2
GND
Q1
Q0
VCC
HF
FULL
GND
GND
AF/AE
VCC
NC
NC
LDCK
GND
NC
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NC
GND
GND
Q16
Q17
VCC
EMPTY
GND
VCC
RESET
OE
NC
NC
UNCK
GND
D17
D16
D15
NC
NC
25 26 27 28
PN PACKAGE
(TOP VIEW)
79 78 77 76 75
80
74
72 71 70
73
29 30 31 32 33
69 68
21
67 66 65 64
34 35 36 37 38 39 40
63 62 61
NC – No internal connection
description
A FIFO memory is a storage device that allows data to be written into and read from its array at independent
data rates. The SN74ACT7802 is a 1024-word by 18-bit FIFO for high-speed applications. It processes data
in a bit-parallel format at rates up to 40 MHz and access times of 30 ns.
Data is written into the FIFO memory on a low-to-high transition on the load-clock (LDCK) input and is read out
on a low-to-high transition on the unload-clock (UNCK) input. The memory is full when the number of words
clocked in exceeds by 1024 the number of words clocked out. When the memory is full, LDCK has no effect on
the data in the memory; when the memory is empty, UNCK has no effect.
A low level on the reset (RESET) input resets the FIFO internal clock stack pointers and sets full (FULL) high,
almost full/almost empty (AF/AE) high, half full (HF) low, and empty (EMPTY) low. The Q outputs are not reset
to any specific logic level. The FIFO must be reset upon power up. The Q outputs are noninverting and are in
the high-impedance state when the output-enable (OE) input is low.
When writing to the FIFO after a reset pulse or when the FIFO is empty, the first active transition on LDCK drives
EMPTY high and causes the first word written to the FIFO to appear on the Q outputs. An active transition on
UNCK is not required to read the first word written to the FIFO. Each subsequent read from the FIFO requires
an active transition on UNCK.
The SN74ACT7802 can be cascaded in the word-width direction but not in the word-depth direction.
The SN74ACT7802 is characterized for operation from 0
°C to 70°C.


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