SN74ACT3641-20PCB

Overview

The SN74ACT3641-20PCB is a high-speed, low-power CMOS clocked FIFO memory with a 1024 x 36 organization. It supports clock frequencies up to 67 MHz and features fast access times of 11 ns. The device utilizes advanced 0.8-micron CMOS technology and includes two 36-bit mailbox registers for control communication. It offers synchronous read-retransmit capability and programmable almost-full and almost-empty flags synchronized to independent port clocks.

Feature Summary

• Dual-port architecture supporting asynchronous or coincident free-running clocks
• Synchronous retransmit capability allowing repeated data access from user-selected positions
• Programmable flag offsets for almost-full and almost-empty conditions via preset, parallel, or serial methods
• Integrated mailbox registers for bypassing the main memory array during control transfers

Applications

• Buffering data between microprocessors and buses with synchronous control interfaces
• Creating wider datapaths by connecting multiple devices in parallel
• FIR filtering applications using DSP interfaces
• Initializing DMA control through mailbox-bypass registers

Procurement Notes

Verify the specific ordering suffix matches the required package type, as the PCB designation indicates a 120-pin Thin Quad Flat package. Confirm that the revision level aligns with current production standards. Ensure environmental specifications meet the operational temperature range requirements for the intended deployment environment before finalizing procurement.

Selection Notes

Select this component when a large depth 36-bit wide buffer is required with independent clock domains. Consider its pin-to-pin compatibility with the SN74ACT3631 and SN74ACT3651 if system upgrades are planned. Evaluate the need for retransmit functionality and mailbox registers against simpler FIFO alternatives to ensure optimal cost and complexity balance.

Part Context

This part belongs to the SN74ACT series of advanced CMOS logic products manufactured by Texas Instruments. It is designed for high-performance digital systems requiring reliable data buffering between different clock domains. The device represents a specialized solution for complex interface management tasks in industrial and telecommunications equipment.

Replacement Considerations

The SN74ACT3631 and SN74ACT3651 are confirmed pin-to-pin compatible substitutes within the same product family.