Product Descriptions

A FIFO memory is a storage device that allows data to be written into and read from its array at independent data rates. The SN74ABT7820 is arranged as two 512 × 18-bit FIFOs for high speed and fast access times. It processes data at rates up to 67 MHz with access times of 12 ns in a bit-parallel format. 

The SN74ABT7820 consists of bus-transceiver circuits, two 512 × 18 FIFOs, and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal FIFO memories. Enable inputs (GAB and GBA) control the transceiver functions. The SAB and SBA control inputs select whether real-time or stored data is transferred. The circuitry used for select control eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data. Figure 1 illustrates the eight fundamental bus-management functions that can be performed with the SN74ABT7820. 

The SN74ABT7820 is characterized for operation from 0°C to 70°C.

Product Features

 Member of the Texas Instruments Widebus  Family

Advanced BiCMOS Technology

Independent Asynchronous Inputs and Outputs

Two Separate 512 × 18 FIFOs Buffering Data in Opposite Directions

Programmable Almost-Full/Almost-Empty Flags

Empty, Full, and Half-Full Flags

Fast Access Times of 12 ns With a 50-pF Load and Simultaneous Switching Data Outputs

Supports Clock Rates up to 67 MHz

Package Options Include 80-Pin Quad Flat (PH) and 80-Pin Thin Quad Flat (PN) Packages

Product Specifications

Product Photos

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