SN74ACT3651-15PCB

Overview

The SN74ACT3651-15PCB is a high-speed, low-power CMOS clocked FIFO memory featuring a 2048 x 36 dual-port SRAM architecture. It supports independent asynchronous or coincident clocks for Port A and Port B, enabling data buffering between ports with read access times as fast as 11 ns. The device operates within a voltage range of 4.5 V to 5.5 V and is characterized for temperatures from 0°C to 70°C. It includes retransmit capability, mailbox registers, and programmable flags.

Feature Summary

• Supports synchronous read-retransmit capability allowing repeated access to previously read data starting at a user-selected position.
• Features two 36-bit mailbox registers that pass command and control information between Port A and Port B independently of the main FIFO array.
• Includes programmable almost-full and almost-empty flags synchronized to their respective port clocks to indicate specific memory fill levels.

Applications

• Buffering data transfers between microprocessors and buses with synchronous control interfaces.
• Creating wider data paths by connecting multiple devices in parallel.
• Implementing bypass registers to initialize DMA control systems.

Procurement Notes

Verify the package type matches the PCB designation (120-pin Thin Quad Flat). Confirm the suffix -15 indicates the specified 11 ns access time variant. Ensure the operating temperature range meets the application requirements of 0°C to 70°C. Check for RoHS compliance status if required by the manufacturing process.

Selection Notes

Select this component when a dual-port FIFO with independent clock domains is required for buffering data between asynchronous or coincident systems. Consider the 36-bit data width and 2048-word depth against system bandwidth needs. Evaluate the need for retransmit functionality and mailbox registers for control signaling before choosing alternative single-port or narrower-width FIFOs.

Part Context

This part belongs to the SN74ACT3651 family of clocked FIFO memories manufactured by Texas Instruments. It is pin-to-pin compatible with the SN74ACT3631 and SN74ACT3641 models, facilitating design upgrades or replacements within existing hardware architectures without requiring board layout changes.

Replacement Considerations

The SN74ACT3631 and SN74ACT3641 are confirmed pin-compatible substitutes within the same product family.