SN74ACT7804-25DLR

FIFOs Memory Overview

The SN74ACT7804-25DLR is a 512-word by 18-bit strobed first-in, first-out memory device manufactured by Texas Instruments. It utilizes low-power advanced CMOS technology and features 3-state outputs. The component supports data rates up to 40 MHz with an access time of 15 ns under specified load conditions. It operates within a supply voltage range of 4.5 V to 5.5 V and functions at temperatures from 0°C to 70°C. The device includes full, empty, half-full, and programmable almost-full/almost-empty status flags.

FIFOs Memory Feature Summary

• Provides 512 words by 18 bits of FIFO storage using low-power advanced CMOS technology.
• Features 3-state outputs for bus interfacing and independent load/unload clock inputs.
• Includes status monitoring via full, empty, half-full, and programmable almost-full/almost-empty flags.

FIFOs Memory Applications

• High-speed data buffering between asynchronous systems
• Data rate matching in communication interfaces
• Temporary storage in digital signal processing pipelines

FIFOs Memory Procurement Notes

Verify the specific suffix DLR indicates reel packaging when sourcing. Confirm the -25 speed grade corresponds to the required 15 ns access time and 40 MHz maximum frequency for your design. Ensure the SSOP-56 package dimensions match your PCB footprint requirements before finalizing orders.

FIFOs Memory Selection Notes

Select this part for applications requiring wide 18-bit parallel data handling with FIFO capabilities. Compare against SN74ACT7806 and SN74ACT7814 for pin-compatible alternatives if different timing or organization is needed. Consider the programmable AF/AE flag feature for custom buffer level monitoring needs.

FIFOs Memory Part Context

This component belongs to the Widebus family of logic ICs from Texas Instruments. It is designed for high-speed parallel data transfer applications. The device is characterized for commercial temperature ranges and offers robust performance through its ACT series technology.

FIFOs Memory Replacement Considerations

The datasheet confirms pin-to-pin compatibility with SN74ACT7806 and SN74ACT7814. Verify electrical specifications and timing parameters of these substitutes to ensure they meet the system requirements before replacement.

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. By holding the Program Enable (PEN) input low during the first one or two rising edges of the Load Clock (LDCK), the binary value on data inputs D0-D7 is latched as the offset values.

What happens to the data outputs during a reset?

A low level on the RESET input resets the internal stack pointers and sets the FULL and AF/AE flags high, while setting HF and EMPTY flags low. However, the Q outputs are not reset to any specific logic level.