SN74ACT3641-20PQ

Overview

The SN74ACT3641 is a high-speed, low-power CMOS clocked FIFO memory featuring a 1024 x 36 dual-port SRAM architecture. It supports independent asynchronous or coincident clocks for Port A and Port B, enabling data buffering between the two ports. The device includes synchronous read-retransmit capability, allowing previously read data to be accessed repeatedly from a user-selected position. Each port utilizes a 36-bit mailbox register for command and control information transfer. Programmable almost-full and almost-empty flags indicate specific memory fill levels, while input-ready and output-ready flags manage flow control.

Feature Summary

• Dual-port SRAM architecture with independent Port A and Port B interfaces
• Synchronous retransmit capability for repeated access to selected data words
• Programmable almost-full and almost-empty status flags
• Two 36-bit bypass mailbox registers for control communication

Applications

• Buffering data streams between microprocessors and buses
• FIR filtering applications in DSP systems
• Initializing DMA control via mailbox-bypass registers
• Creating wider datapaths by connecting multiple devices in parallel

Procurement Notes

Verify the package type against project requirements, as the device is available in 120-pin Thin Quad Flat (PCB) and 133-pin Plastic Quad Flat (PQ) configurations. Confirm that the operating temperature range of 0°C to 70°C aligns with the environmental specifications of the target application. Ensure proper power-up reset sequencing is implemented before initiating data transfers.

Selection Notes

Select this component when a large depth buffer with wide 36-bit data paths is required. The ACT logic family provides fast access times suitable for high-frequency operations up to 67 MHz. Consider the pin-to-pin compatibility with SN74ACT3631 and SN74ACT3651 if upgrading existing designs. Evaluate the need for programmable flag offsets to optimize system throughput based on specific latency constraints.

Part Context

This device belongs to the Texas Instruments SN74ACT series of advanced CMOS logic components. It is specifically designed as a clocked first-in, first-out memory solution. The part is characterized for commercial operation within a standard temperature range. It serves as a specialized interface component for managing data flow in complex digital systems requiring reliable buffering and synchronization.

Replacement Considerations

The SN74ACT3641 is pin-to-pin compatible with the SN74ACT3631 and SN74ACT3651. Verify functional equivalence regarding flag programming methods and retransmit behavior when substituting these parts.