SN74ACT7804-40DLR

FIFOs Memory Overview

The SN74ACT7804-40DLR is a 512-word by 18-bit strobed first-in, first-out memory utilizing low-power advanced CMOS technology. It supports data rates up to 50 MHz with access times of 15 ns under a 50-pF load. The device operates within a supply voltage range of 4.5 V to 5.5 V and features three-state outputs. It includes full, empty, half-full, and programmable almost-full/almost-empty status flags.

FIFOs Memory Feature Summary

• Supports independent write and read clocking via Load Clock (LDCK) and Unload Clock (UNCK) inputs for asynchronous or coincident operation.
• Provides comprehensive status monitoring through dedicated Full, Empty, Half-Full, and programmable Almost-Full/Almost-Empty output flags.
• Features three-state data outputs controlled by an Output Enable (OE) input to facilitate bus sharing in parallel systems.

FIFOs Memory Applications

• High-speed buffering between data sources operating at different clock rates
• Word-width expansion configurations for wider data buses
• Synchronization interfaces in digital signal processing systems

FIFOs Memory Procurement Notes

Verify the specific suffix 'DLR' against the manufacturer's current documentation to confirm package type and reel specifications. Confirm that the '-40' speed grade matches the required timing constraints for your application design. Ensure compatibility with existing system voltage levels before integration.

FIFOs Memory Selection Notes

Select this component when a 512 x 18 bit capacity is required with fast access times. Consider the SN74ACT7806 or SN74ACT7814 if pin-to-pin compatibility with alternative depths is needed. Evaluate the programmable flag offsets if specific buffer level thresholds are critical for system control logic.

FIFOs Memory Part Context

This part belongs to the Widebus family of high-performance FIFO memories from Texas Instruments. It utilizes low-power advanced CMOS technology to achieve high speeds while maintaining low power consumption. The device is characterized for operation over a commercial temperature range of 0°C to 70°C.

FIFOs Memory Replacement Considerations

The SN74ACT7806 and SN74ACT7814 are documented as pin-to-pin compatible alternatives within the same product family.

FIFOs Memory FAQ

How is the Almost-Full/Almost-Empty flag programmed?

The offset values are programmed after reset by holding the Program Enable (PEN) input low and applying low-to-high transitions on the Load Clock (LDCK) input while providing the desired binary value on the data inputs D0–D7.

What is the function of the Reset input?

A low level on the Reset input resets internal stack pointers, drives the Full and Almost-Full/Almost-Empty flags high, and drives the Half-Full and Empty flags low. The data outputs remain in their previous state.