SN74ACT7801
1024 X 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY

SCAS111 - APRIL 1990 - REVISED MAY 1991

Copyright © 1991, Texas Instruments Incorporated

features

• Member of the Texas Instruments Widebus^TM Family
• Independent Asynchronous Inputs and Outputs
• 1024 Words × 18 Bits
• Read and Write Operations Can Be Synchronized to Independent System Clocks
• Programmable Almost-Full/Almost-Empty Flag
• Input-Ready, Output-Ready, and Half-Full Flags
• Cascadable in Word Width and/or Word Depth
• Fast Access Times of 15 ns With a 50-pF Load
• High-Output Drive for Direct Bus Interface
• 3-State Outputs
• Available in 68-Pin PLCC (FN) or Space-Saving 80-Pin Shrink Quad Flat Package (PN)

  Widebus is a trademark of Texas Instruments Incorporated.

   

   

description

A FIFO memory is a storage device that allows data to be written into and read from its array at independent data rates. The SN74ACT7801 is a 1024- × 18-bit FIFO for high speed and fast access times. It processes data at rates up to 40 MHz and access times of 15 ns in a bit-parallel format. Data outputs are noninverting with respect to the data inputs. Expansion is easily accomplished in both word width and word depth.

The SN74ACT7801 has normal input-bus-to-output-bus asynchronous operation. The special enable circuitry adds the ability to synchronize independent read and write (interrupts, requests) to their respective system clock.