SN74ACT7806-40DL

FIFOs Memory Overview

The SN74ACT7806-40DL is a 256-word by 18-bit asynchronous FIFO memory manufactured using low-power advanced CMOS technology. It features independent load and unload clock inputs, allowing data rates up to 50 MHz with access times of 24 ns under a 50-pF load. The device includes full, empty, half-full, and programmable almost-full/almost-empty status flags. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from 0°C to 70°C.

FIFOs Memory Feature Summary

• Supports asynchronous or coincident load and unload clocks for independent data rate processing
• Includes programmable almost-full/almost-empty flag via program enable input
• Provides comprehensive status monitoring through full, empty, and half-full output flags
• Features three-state outputs controlled by a dedicated output-enable input

FIFOs Memory Applications

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

FIFOs Memory Procurement Notes

Verify the specific suffix '40' corresponds to the required 24 ns maximum access time and 25 MHz maximum clock frequency specifications. Confirm that the SSOP-56 package meets the thermal and physical constraints of the target application. Ensure the operating environment remains within the specified 0°C to 70°C temperature range for reliable performance.

FIFOs Memory Selection Notes

Select this component when asynchronous FIFO functionality with an 18-bit data width is required. Compare against the SN74ACT7804 and SN74ACT7814 for pin-compatible alternatives if different timing or depth characteristics are needed. Evaluate the power dissipation capacitance and supply current requirements against system power budgets.

FIFOs Memory Part Context

This device belongs to Texas Instruments' Widebus family of logic products. It utilizes low-power advanced CMOS technology to achieve high speed while maintaining low static power consumption. The part is designed for parallel data transfer applications requiring fast access times and robust status flagging capabilities.

FIFOs Memory Replacement Considerations

Pin-to-pin compatible substitutes include the SN74ACT7804 and SN74ACT7814. Verify that the alternative part number meets the specific timing requirements and operational voltage ranges of the design.

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–D6 is latched as the offset values.

What is the function of the Output Enable (OE) input?

When the OE input is high, the data outputs (Q0–Q17) enter a high-impedance state, effectively disconnecting them from the bus regardless of the internal memory state.