SN74ACT3641-30PCB

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 low-power 0.8-μm Advanced CMOS technology and includes synchronous read-retransmit capability. It contains two 36-bit mailbox registers for control communication and offers programmable almost-full and almost-empty flags synchronized to independent port clocks.

Feature Summary

• Supports asynchronous or coincident free-running clocks for Port A and Port B
• Includes synchronous retransmit capability for repeated data access from user-selected positions
• Features two 36-bit mailbox registers for command and control information transfer between ports
• Provides programmable almost-full and almost-empty status flags synchronized to respective port clocks

Applications

• Buffering data transfers between microprocessors and buses with synchronous control
• Creating wider datapaths through parallel device expansion
• Expanding word depth in memory systems
• DSP-interface applications for FIR filtering
• Initializing DMA control using bypass registers

Procurement Notes

Verify the specific package variant required, as the SN74ACT3641 is available in both 120-pin Thin Quad Flat (PCB) and 132-pin Plastic Quad Flat (PQ) packages. Confirm that the ordering suffix matches the desired physical footprint. Ensure compatibility with existing board layouts when selecting between the PCB and PQ options, as pin counts and arrangements differ significantly between these package types.

Selection Notes

Select this component for applications requiring dual-port SRAM buffering with independent clock domains. The device is suitable for systems needing synchronous interface control and flag synchronization to prevent metastability. Consider the 11 ns access time and 67 MHz clock support for high-speed data throughput requirements. Verify that the 36-bit data width aligns with system bus specifications before integration.

Part Context

This device belongs to the SN74ACT series of advanced CMOS logic components manufactured by Texas Instruments. It is part of a family of clocked FIFO memories designed for high-performance digital signal processing and data buffering. The SN74ACT3641 shares pin-to-pin compatibility with the SN74ACT3631 and SN74ACT3651 models, facilitating design upgrades within the same product line.

Replacement Considerations

The SN74ACT3641 is pin-to-pin compatible with the SN74ACT3631 and SN74ACT3651.