SN74ACT3641-15PQ

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 0.8-micron CMOS technology and operates within a temperature range of 0°C to 70°C. It includes two 36-bit mailbox registers for control data transfer and offers synchronous read-retransmit capabilities.

Feature Summary

• Supports asynchronous or coincident free-running clocks for Port A and Port B
• Includes programmable almost-full and almost-empty status flags
• Features synchronized input-ready and output-ready indicators
• Provides two 36-bit bypass mailbox registers for command and control information

Applications

• Buffering data between microprocessors and buses with synchronous control
• Creating wider datapaths using parallel device configurations
• Implementing DMA control initialization via bypass registers

Procurement Notes

Verify the specific package variant required, as the device is available in 120-pin Thin Quad Flat (PCB) and 132-pin Plastic Quad Flat (PQ) packages. Confirm that the operating environment remains within the specified 0°C to 70°C commercial temperature range. Ensure proper reset sequencing involving four clock transitions on both ports before initiating data operations.

Selection Notes

Select this component when interfacing systems requiring independent port clocks and high-speed data buffering. The 36-bit width suits applications needing wide data paths without external multiplexing. Consider the retransmit feature if repeated data access from a specific memory location is necessary. Verify pin compatibility with existing SN74ACT3631 or SN74ACT3651 designs if migration is planned.

Part Context

This part belongs to the SN74ACT series of advanced CMOS logic devices manufactured by Texas Instruments. It functions as a dual-port SRAM-based FIFO buffer designed for high-performance digital signal processing and interface applications. The device is characterized for commercial operation and is pin-compatible with related ACT family members.

Replacement Considerations

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