SN74ACT7881-30FN

FIFOs Memory Overview

The SN74ACT7881-30FN is a synchronous first-in, first-out memory device organized as 1024 words by 18 bits. It operates with a supply voltage range of 4.5 V to 5.5 V and supports data rates up to 33.4 MHz. The component features independent asynchronous inputs and outputs, allowing read and write operations to be synchronized to separate system clocks via RDCLK and WRTCLK. It provides fast access times of 18 ns and includes programmable status flags such as half-full, input-ready, output-ready, and an almost-full/almost-empty flag. The device is housed in a 68-pin plastic leaded chip carrier package.

FIFOs Memory Feature Summary

• Supports independent read and write clock synchronization for asynchronous data transfer between domains
• Includes programmable almost-full/almost-empty boundary detection via DAF pin configuration
• Provides comprehensive status monitoring through half-full, input-ready, and output-ready flags
• Enables easy expansion of word depth or width through cascading configurations

FIFOs Memory Applications

• Buffering data streams between asynchronous clock domains
• Data rate matching in high-speed digital systems
• Temporary storage in communication interface protocols
• System expansion using word-depth or word-width chaining

FIFOs Memory Procurement Notes

Verify the specific -30 speed grade suffix against current Texas Instruments documentation to confirm the 33.4 MHz maximum frequency rating. Ensure the 68-PLCC (FN) package matches the target board footprint. Confirm RoHS compliance status and check for obsolescence notices, as this component may have limited production availability compared to newer alternatives.

FIFOs Memory Selection Notes

Select this component when a 1024 x 18 bit synchronous FIFO is required with independent clock domains. It is suitable for applications needing programmable buffer thresholds and direct bus interface capabilities. Consider the 18-bit data width and 68-pin package constraints during PCB layout. Verify that the 4.5 V to 5.5 V operating voltage aligns with the system power rails.

FIFOs Memory Part Context

This part belongs to the Texas Instruments Widebus family of logic ICs. It is designed for high-performance buffering and is pin-to-pin compatible with related devices like the SN74ACT7882, SN74ACT7884, and SN74ACT7811. The ACT series ensures compatibility with standard CMOS logic levels while providing faster switching speeds than earlier AC variants.

FIFOs Memory Replacement Considerations

Public confirmed substitutes include SN74ACT7882, SN74ACT7884, and SN74ACT7811 due to pin-to-pin compatibility.