SN74ACT7807-40FN

FIFOs Memory Overview

The SN74ACT7807-40FN is a 2048-word by 9-bit clocked first-in, first-out memory device manufactured using low-power advanced CMOS technology. It supports data rates up to 67 MHz with fast access times of 12 ns under a 50-pF load. The component features independent write and read clocks that can be asynchronous or coincident, along with programmable almost-full/almost-empty flags. It operates within a supply voltage range of 4.5 V to 5.5 V and an ambient temperature range of 0°C to 70°C.

FIFOs Memory Feature Summary

• Supports free-running read and write clocks that may be asynchronous or coincident for flexible system integration.
• Includes input-ready, output-ready, half-full, and programmable almost-full/almost-empty status flags.
• Features three-state outputs with noninverting data paths relative to inputs.
• Allows cascading in both word width and word depth for expanded memory configurations.

FIFOs Memory Applications

• High-speed data buffering between asynchronous clock domains
• Parallel data interface synchronization in communication systems
• Memory expansion through word-width or word-depth cascading

FIFOs Memory Procurement Notes

Verify the specific suffix -40FN corresponds to the required speed grade and plastic leaded chip carrier package. Confirm the operating temperature range meets application requirements. Ensure power supply decoupling aligns with recommended conditions. Check for latest revision updates on the datasheet before finalizing design specifications.

FIFOs Memory Selection Notes

Select this component when a 2048 x 9 bit FIFO with independent clocking is required. Consider the 12 ns access time and 67 MHz maximum frequency for high-speed parallel interfaces. Evaluate the need for programmable flag offsets if custom buffer thresholds are necessary. Verify compatibility with 5 V logic levels and low-power CMOS requirements.

FIFOs Memory Part Context

This device belongs to the SN74ACT series of advanced CMOS logic components. It provides a specialized memory function distinct from standard logic gates. The FN package designation indicates a 44-pin plastic leaded chip carrier format. It is designed for applications requiring reliable data storage and retrieval with precise control over read and write operations.

FIFOs Memory Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout and electrical characteristics against any potential alternative sources before substitution.

FIFOs Memory FAQ

How is the almost-full/almost-empty flag programmed?

The offset values are programmed after reset and before the first word is written. The Program Enable (PEN) pin must be held low while WRTCLK is high to latch the binary value from D0-D8 and WRTEN1/DP9 as the offset limits.

What is the requirement for resetting the FIFO?

Resetting requires asserting the RESET input low while at least four transitions of both WRTCLK and RDCLK occur. This clears synchronizing registers and initializes the status flags appropriately.