SN74ACT3651-20PCB

Overview

The SN74ACT3651-20PCB is a high-speed, low-power CMOS clocked FIFO memory with a 2048 x 36 configuration. It supports clock frequencies up to 67 MHz and features fast access times of 11 ns. The device buffers data from Port A to Port B using independent synchronous interfaces. It includes retransmit capability, two 36-bit mailbox registers for control communication, and programmable almost-full and almost-empty flags. The component operates within a temperature range of 0°C to 70°C.

Feature Summary

• Supports asynchronous or coincident free-running clocks for Port A and Port B
• Includes synchronized read-retransmit capability for repeated data access
• Features dual 36-bit mailbox registers for command and control information exchange
• Provides programmable almost-full and almost-empty status flags

Applications

• Buffering data between microprocessors and buses with synchronous control
• Creating wider data paths by connecting multiple devices in parallel
• Implementing DSP-interface applications such as FIR filtering
• Initializing DMA control using bypass registers

Procurement Notes

Verify the specific ordering suffix PCB confirms the 120-pin Thin Quad Flat package variant. Confirm the revision level matches SCAS439D – Revised February 1999 specifications. Ensure the supply source provides production data consistent with Texas Instruments standard warranty terms. Check for RoHS compliance details if required by the target assembly process.

Selection Notes

Select this component when a 36-bit wide data path is required for high-speed buffering. It is suitable for systems needing independent port clocks that may operate asynchronously. Consider its pin-to-pin compatibility with SN74ACT3631 and SN74ACT3641 if upgrading existing designs. Evaluate the need for retransmit functionality and mailbox registers for complex control logic integration.

Part Context

This part belongs to the SN74ACT series of advanced CMOS logic devices manufactured by Texas Instruments. It is functionally related to the SN74ACT3631 and SN74ACT3641 models, offering pin-compatible alternatives within the same family. The device utilizes low-power 0.8-micron technology to achieve high performance while maintaining power efficiency standards typical of the ACT logic family.

Replacement Considerations

The SN74ACT3651 is pin-to-pin compatible with the SN74ACT3631 and SN74ACT3641. Verify that the substitute part number matches the specific package type and electrical characteristics required for the application.