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SN74ACT3651PCB Arkusz danych(PDF) 1 Page - Texas Instruments

Numer części SN74ACT3651PCB
Szczegółowy opis  2048 횞 36 CLOCKED FIRST-IN, FIRST-OUT MEMORY
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

SN74ACT3651PCB Arkusz danych(HTML) 1 Page - Texas Instruments

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SN74ACT3651
2048
× 36
CLOCKED FIRST-IN, FIRST-OUT MEMORY
SCAS439D – JUNE 1994 – REVISED FEBRUARY 1999
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 AF Flags Synchronized by
CLKA
D Output-Ready and AE 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 SN74ACT3631
and SN74ACT3641
D Package Options Include 120-Pin Thin
Quad Flat (PCB) and 132-Pin Plastic Quad
Flat (PQ) Packages
description
The SN74ACT3651 is a high-speed, low-power, CMOS clocked FIFO memory that supports clock frequencies
up to 67 MHz and has read access times as fast as 11 ns. The 2048
× 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 takes place with two 36-bit mailbox registers. Each mailbox register has a flag that signals
when new mail has been stored. Two or more devices are used in parallel to create wider data paths. Expansion
is also possible in word depth.
The SN74ACT3651 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 AF and AE are programmed from port A or through a serial input.
The SN74ACT3651 is characterized for operation from 0
°C to 70°C.
For more information on this device family, see the following application reports:
FIFO Patented Synchronous Retransmit: Programmable DSP-Interface Application for FIR Filtering
(literature number SCAA009)
FIFO Mailbox-Bypass Registers: Using Bypass Registers to Initialize DMA Control
(literature number SCAA007)
Metastability Performance of Clocked FIFOs (literature number SCZA004)
Copyright
© 1999, 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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