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SN74ACT7802-60PN Folha de dados(PDF) 4 Page - Texas Instruments

Nome de Peças SN74ACT7802-60PN
Descrição Electrónicos  1024 횞 18 STROBED FIRST-IN, FIRST-OUT MEMORY
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Fabricante Electrônico  TI [Texas Instruments]
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SN74ACT7802-60PN Folha de dados(HTML) 4 Page - Texas Instruments

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SN74ACT7802
1024
× 18 STROBED FIRST-IN, FIRST-OUT MEMORY
SCAS187D – AUGUST 1990 – REVISED APRIL 1998
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional block diagram
OE
D0–D17
UNCK
Q0–Q17
AF/AE
HF
LDCK
EMPTY
FULL
RESET
DAF
Read
Control
Write
Control
Reset
Logic
Status-
Flag
Logic
Read
Pointer
Write
Pointer
Location 1023
Location 2
Location 1
Location 1024
1024
× 18 RAM
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.†
I/O
DESCRIPTION
AF/AE
33
O
Almost-full/almost-empty flag. Depth-offset values can be programmed for AF/AE, or the default value
of 256 can be used for the almost-empty almost-full offset (X). AF/AE is high when memory contains X
or fewer words or (1024 – X) or more words. AF/AE is high after reset.
DAF
27
I
Define almost-full flag. The high-to-low transition of DAF stores the binary value of data inputs as the
AF/AE offset value (X). With DAF held low, a low pulse on RESET defines AF/AE using X.
D0–D17
7–15, 17,
19–26
I
18-bit data input port
EMPTY
66
O
Empty flag. EMPTY is low when the FIFO is empty. A FIFO reset also causes EMPTY to go low.
FULL
35
O
Full flag. FULL is low when the FIFO is full. A FIFO reset causes FULL to go high.
HF
36
O
Half-full flag. HF is high when the FIFO memory contains 512 or more words. HF is low after reset.
LDCK
29
I
Load clock. Data is written to the FIFO on the rising edge of LDCK when FULL is high.
OE
2
I
Output enable. When OE is low, the data outputs are in the high-impedance state.
Q0–Q17
38–39, 41–42,
44, 46–47,
49–50, 52–53,
55–56, 58–59,
61, 63–64
O
18-bit data-output port
RESET
1
I
Reset. A low level on RESET resets the FIFO and drives AF/AE and FULL high and HF and EMPTY low.
UNCK
5
I
Unload clock. Data is read from the FIFO on the rising edge of UNCK when EMPTY is high.
† Terminal numbers listed are for the FN package.


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