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SN74ACT3632PQ Datenblatt(PDF) 3 Page - Texas Instruments

Teilenummer SN74ACT3632PQ
Bauteilbeschribung  512 횞 36 횞 2 CLOCKED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
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SN74ACT3632
512
× 36 × 2
CLOCKED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
SCAS224D – JUNE 1992 – REVISED APRIL 1998
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description
The SN74ACT3632 is a high-speed, low-power CMOS clocked bidirectional FIFO memory. It supports clock
frequencies up to 67 MHz and has read access times as fast as 11 ns. Two independent 512
× 36 dual-port
SRAM FIFOs on the chip buffer data in opposite directions. Each FIFO has flags to indicate empty and full
conditions and two programmable flags, almost full (AF) and almost empty (AE) to indicate when a selected
number of words is stored in memory. Communication between each port can bypass the FIFOs via 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.
The SN74ACT3632 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 port clock by enable signals. The 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 bidirectional interface between microprocessors and/or buses with
synchronous control.
The input-ready (IRA, IRB) flag and almost-full (AFA, AFB) flag of a FIFO are two-stage synchronized to the
port clock that writes data to its array. The output-ready (ORA, ORB) flag and almost-empty (AEA, AEB) flag
of a FIFO are two-stage synchronized to the port clock that reads data from its array. Offset values for the AF
and AE flags of both FIFOs can be programmed from port A.
The SN74ACT3632 is characterized for operation from 0
°C to 70°C.
For more information on this device family, see the following application reports:
FIFO Mailbox-Bypass Registers: Using Bypass Registers to Initialize DMA Control
(literature number SCAA007)
Interfacing TI Clocked FIFOs With TI Floating-Point Digital Signal Processors (literature number
SCAA005)
Metastability Performance of Clocked FIFOs (literature number SCZA004)


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