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IDT72421 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - FIFO memories - Integrated Device Technology

भाग संख्या IDT72421
समारोह FIFO memories
मैन्युफैक्चरर्स Integrated Device Technology 
लोगो Integrated Device Technology लोगो 
पूर्व दर्शन
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<?=IDT72421?> डेटा पत्रक पीडीएफ

IDT72421 pdf
IDT72421/72201/72211/72221/72231/72241/72251 CMOS SyncFIFO™
64 x 9, 256 x 9, 512 x 9, 1,024 x 9, 2,048 x 9, 4,096 x 9 and 8,192 x 9
PIN CONFIGURATION
INDEX
D1
D0
PAF
PAE
GND
REN1
RCLK
REN2
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 10 11 12 13 14 15 16
WEN1
WCLK
WEN2/LD
VCC
Q8
Q7
Q6
Q5
2655 drw 02
TQFP (PR32-1, order code: PF)
TOP VIEW
COMMERCIAL AND INDUSTRIAL
TEMPERATURERANGES
INDEX
D1
D0
PAF
PAE
GND
REN1
RCLK
REN2
OE
4 3 2 32 31 30
5 1 29
6 28
7 27
8 26
9 25
10 24
11 23
12 22
13 21
14 15 16 17 18 19 20
RS
WEN1
WCLK
WEN2/LD
VCC
Q8
Q7
Q6
Q5
2655 drw02a
PLCC (J32-1, order code: J)
TOP VIEW
PIN DESCRIPTIONS
Symbol
Name
D0-D8 DataInputs
RS Reset
WCLK
WEN1
Write Clock
Write Enable 1
WEN2/ Write Enable 2/
LD Load
Q0-Q8
RCLK
REN1
Data Outputs
Read Clock
Read Enable 1
REN2 Read Enable 2
OE OutputEnable
EF Empty Flag
PAE Programmable
Almost-Empty Flag
PAF Programmable
Almost-Full Flag
FF Full Flag
VCC Power
GND Ground
I/O Description
I Data inputs for a 9-bit bus.
I When RS is set LOW, internal read and write pointers are set to the first location of the RAM array,FF and PAF
go HIGH, and PAE and EF go LOW. A reset is required before an initial WRITE after power-up.
I Data is written into the FIFO on a LOW-to-HIGH transition of WCLK when the Write Enable(s) are asserted.
I If the FIFO is configured to have programmable flags, WEN1 is the only write enable pin. When WEN1 is LOW,
data is written into the FIFO on every LOW-to-HIGH transition WCLK. If the FIFO is configured to have two write
enables, WEN1 must be LOW and WEN2 must be HIGH to write data into the FIFO. Data will not be written into
the FIFO if the FF is LOW.
I The FIFO is configured at reset to have either two write enables or programmable flags. If WEN2/LD is HIGH
at reset, this pin operates as a second write enable. If WEN2/LD is LOW at reset, this pin operates as a control
to load and read the programmable flag offsets. If the FIFO is configured to have two write enables, WEN1 must
be LOW and WEN2 must be HIGH to write data into the FIFO. Data will not be written into the FIFO if the FF is
LOW. If the FIFO is configured to have programmable flags, WEN2/LD is held LOW to write or read the
programmable flag offsets.
O Data outputs for a 9-bit bus.
I Data is read from the FIFO on a LOW-to-HIGH transition of RCLK when REN1 and REN2 are asserted.
I When REN1 and REN2 are LOW, data is read from the FIFO on every LOW-to-HIGH transition of RCLK.
Data will not be read from the FIFO if the EF is LOW.
I When REN1 and REN2 are LOW, data is read from the FIFO on every LOW-to-HIGH transition of RCLK.
Data will not be read from the FIFO if the EF is LOW.
I When OE is LOW, the data output bus is active. If OE is HIGH, the output data bus will be in a high-impedance
state.
O When EF is LOW, the FIFO is empty and further data reads from the output are inhibited. When EF is HIGH, the
FIFO is not empty. EF is synchronized to RCLK.
O When PAE is LOW, the FIFO is almost-empty based on the offset programmed into the FIFO. The default
offset at reset is Empty+7. PAE is synchronized to RCLK.
O When PAF is LOW, the FIFO is almost-full based on the offset programmed into the FIFO. The default offset
at reset is Full-7. PAF is synchronized to WCLK.
O When FF is LOW, the FIFO is full and further data writes into the input are inhibited. When FF is HIGH, the FIFO
is not full. FF is synchronized to WCLK.
One +5 volt power supply pin.
One 0 volt ground pin.
©2

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