SN74ACT7804-20DL

FIFOs Memory Overview

The SN74ACT7804-20DL is a 512-word by 18-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 an access time of 20 ns under a 50-pF load. 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 component is housed in a shrink small-outline package.

FIFOs Memory Feature Summary

• Provides full, empty, half-full, and programmable almost-full/almost-empty status flags for memory depth monitoring.
• Features independent load clock and unload clock inputs allowing asynchronous or coincident data transfer operations.
• Includes 3-state outputs controlled by an output enable input to facilitate bus sharing.

FIFOs Memory Applications

• Buffering data between high-speed processors and slower peripherals
• Clock domain crossing synchronization in digital systems
• Data rate matching between asynchronous communication interfaces

FIFOs Memory Procurement Notes

Verify the specific suffix '20' indicates the 20 ns speed grade against the official datasheet. Confirm the DL package designation matches the required shrink small-outline physical dimensions. Ensure the operating temperature range aligns with system requirements. Check for RoHS compliance status as specified in the manufacturer documentation.

FIFOs Memory Selection Notes

Select this component when a 512 x 18 bit storage capacity is required. Choose based on the 20 ns access time specification for timing constraints. Consider the 3-state output capability if bus isolation is necessary. Verify compatibility with existing logic families using the provided electrical characteristics.

FIFOs Memory Part Context

This part belongs to the SN74ACT7804 family of widebus FIFO memories. It is pin-to-pin compatible with the SN74ACT7806 and SN74ACT7814 models, which offer different memory depths or configurations within the same package footprint.

FIFOs Memory Replacement Considerations

The SN74ACT7806 and SN74ACT7814 are confirmed pin-compatible substitutes within the same product family. Verify that the alternative part number meets the specific memory depth and timing requirements of the design.

FIFOs Memory FAQ

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

The offset values are programmed by holding the program enable input low during the first one or two rising edges of the load clock after a reset.

What happens to the data outputs when the output enable input is high?

When the output enable input is high, the data outputs enter a high-impedance state.