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SN74ACT3631-15PCB Arkusz danych(PDF) 1 Page - Texas Instruments

Numer części SN74ACT3631-15PCB
Szczegółowy opis  512 횞 36 CLOCKED FIRST-IN, FIRST-OUT MEMORY
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Strona internetowa  http://www.ti.com
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SN74ACT3631
512
× 36
CLOCKED FIRST-IN, FIRST-OUT MEMORY
SCAS246G – AUGUST 1993 – REVISED APRIL 1998
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Free-Running CLKA and CLKB Can Be
Asynchronous or Coincident
D Clocked FIFO Buffering Data From Port A
to Port B
D Synchronous Read-Retransmit Capability
D Mailbox Register in Each Direction
D Programmable Almost-Full and
Almost-Empty Flags
D Microprocessor Interface Control Logic
D Input-Ready and Almost-Full Flags
Synchronized by CLKA
D Output-Ready and Almost-Empty Flags
Synchronized by CLKB
D Low-Power 0.8-µm Advanced CMOS
Technology
D Supports Clock Frequencies up to 67 MHz
D Fast Access Times of 11 ns
D Pin-to-Pin Compatible With the
SN74ACT3641 and SN74ACT3651
D Package Options Include 120-Pin Thin
Quad Flat (PCB) and 132-Pin Plastic Quad
Flat (PQ) Packages
description
The SN74ACT3631 is a high-speed, low-power, CMOS clocked FIFO memory. It supports clock frequencies
up to 67 MHz and has read access times as fast as 11 ns. The 512
× 36 dual-port SRAM FIFO buffers data from
port A to port B. The FIFO memory has retransmit capability, which allows previously read data to be accessed
again. The FIFO has flags to indicate empty and full conditions and two programmable flags (almost full and
almost empty) to indicate when a selected number of words is stored in memory. Communication between each
port can take place with two 36-bit mailbox registers. Each mailbox register has a flag to signal when new mail
has been stored. Two or more devices can be used in parallel to create wider datapaths. Expansion also is
possible in word depth.
The SN74ACT3631 is a clocked FIFO, which means each port employs a synchronous interface. All data
transfers through a port are gated to the low-to-high transition of a continuous (free-running) port clock by enable
signals. The continuous clocks for each port are independent of one another and can be asynchronous or
coincident. The enables for each port are arranged to provide a simple interface between microprocessors
and/or buses with synchronous control.
The input-ready (IR) flag and almost-full (AF) flag of the FIFO are two-stage synchronized to CLKA. The
output-ready (OR) flag and almost-empty (AE) flag of the FIFO are two-stage synchronized to CLKB. Offset
values for the AF and AE flags of the FIFO can be programmed from port A or through a serial input.
The SN74ACT3631 is characterized for operation from 0
°C to 70°C.
For more information on this device family, see the following application reports:
D FIFO Patented Synchronous Retransmit: Programmable DSP-Interface Application for FIR Filtering
(literature number SCAA007)
D FIFO Mailbox-Bypass Registers: Using Bypass Registers to Initialize DMA Control (literature number
SCAA007)
D Metastability Performance of Clocked FIFOs (literature number SCZA004).
Copyright
© 1998, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.


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