SN74ACT7808-40FN

FIFOs Memory Overview

The SN74ACT7808-40FN is a 2048-word by 9-bit asynchronous FIFO memory manufactured by Texas Instruments. It utilizes low-power advanced CMOS technology and features 3-state outputs. The device supports data rates up to 50 MHz with access times of 15 ns under a 50-pF load. Operating voltage ranges from 4.5 V to 5.5 V, with an operating temperature range of 0°C to 70°C. It includes programmable almost-full/almost-empty flags and expansion logic for depth cascading.

FIFOs Memory Feature Summary

• Supports independent load and unload clocks for asynchronous or coincident data processing.
• Features programmable almost-full/almost-empty status flags for buffer management.
• Includes expansion logic allowing depth cascading of multiple devices.
• Provides three-state outputs controlled by an output enable input.

FIFOs Memory Applications

• High-speed data buffering between asynchronous clock domains
• Depth expansion in multi-device FIFO architectures
• Parallel data storage applications requiring fast access times

FIFOs Memory Procurement Notes

Verify the specific -40 speed grade suffix corresponds to the required 15 ns access time and 50 MHz maximum frequency. Confirm the FN package designation matches the 44-pin plastic leaded chip carrier requirement. Ensure the component meets the specified 0°C to 70°C commercial temperature range for your application environment.

FIFOs Memory Selection Notes

Select this component when a 9-bit wide asynchronous FIFO with 2048-word depth is required. Consider the -40 speed grade if 15 ns access time is necessary. Evaluate the need for programmable AF/AE flags and depth expansion capabilities. Verify that the 4.5 V to 5.5 V supply voltage aligns with system power rails.

FIFOs Memory Part Context

This part belongs to the SN74ACT7808 family of strobed first-in, first-out memories. It is designed for high-speed parallel data transfer using low-power advanced CMOS technology. The device integrates status flags and expansion pins to facilitate complex memory configurations in digital systems.

FIFOs Memory Replacement Considerations

SN74ACT7808-20FN

FIFOs Memory FAQ

How are the almost-full and almost-empty offset values programmed?

Offset values are programmed after reset and before the first word is written. Program enable (PEN) must be low while LDCK is low. Subsequent rising edges of LDCK latch the binary value on D0-D8 and DP9 as the offset values.

What is the function of the CASEN pin during depth cascading?

When multiple SN74ACT7808 devices are depth cascaded, the CASEN pin on every device in the chain must be tied low to enable expansion logic.