SN74ACT3641-15PCB

Overview

The SN74ACT3641 is a high-speed, low-power CMOS clocked FIFO memory with a capacity of 1024 words by 36 bits. It supports clock frequencies up to 67 MHz and features fast access times of 11 ns. The device utilizes Advanced 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 with independent asynchronous or coincident clocking for Port A and Port B
• 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 to transfer command and control information

Applications

• Buffering data streams between microprocessors and buses with synchronous control interfaces
• Implementing programmable DSP-interface applications such as FIR filtering
• Initializing DMA control systems using mailbox-bypass registers
• Creating wider datapaths through parallel device expansion

Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the SN74ACT3641 is available in 120-pin Thin Quad Flat (PCB) and 132-pin Plastic Quad Flat (PQ) packages. Confirm the temperature range specification aligns with the operational environment requirements. Ensure compatibility with existing system voltage levels and interface protocols before integration.

Selection Notes

Select this component when a large depth buffer with wide data paths is required. It is suitable for applications needing independent clock domains for input and output ports. Consider its retransmit feature for signal processing loops. Verify pin compatibility with related models like the SN74ACT3631 if space constraints exist. Evaluate the need for mailbox registers for control signaling efficiency.

Part Context

This device belongs to the SN74ACT logic family, characterized by advanced CMOS technology. It is part of a series of clocked FIFO memories designed for high-speed data buffering. The SN74ACT3641 shares pinout compatibility with the SN74ACT3631 and SN74ACT3651, facilitating design flexibility within the same product line.

Replacement Considerations

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