SN74ACT3651-20PQ

Overview

The SN74ACT3651-20PQ is a high-speed, low-power CMOS clocked FIFO memory featuring a 2048 × 36 dual-port SRAM architecture. It supports independent port clocks up to 67 MHz and provides fast access times of 11 ns. The device includes retransmit capability, allowing previously read data to be accessed again. It features programmable almost-full and almost-empty flags, two 36-bit mailbox registers for control communication, and microprocessor interface logic. 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 synchronous read-retransmit capability for repeated data access
• Features two 36-bit mailbox registers with dedicated status flags
• Provides programmable almost-full and almost-empty status flags

Applications

• Buffering data transfer between independent clock domains
• Synchronous DSP-interface applications for FIR filtering
• Initializing DMA control using bypass registers
• Creating wider data paths by parallel device connection

Procurement Notes

Verify the specific suffix '20PQ' corresponds to the 132-pin Plastic Quad Flat (PQ) package configuration as documented in the official datasheet. Confirm that the operational temperature range meets the 0°C to 70°C requirement for the intended environment. Ensure pin compatibility with existing PCB layouts designed for the 132-pin PQ footprint.

Selection Notes

Select this component when interfacing systems requiring a 36-bit wide data path with independent clock domains. It is suitable for applications needing precise flow control via programmable flag offsets. Consider its 11 ns access time and 67 MHz clock support for high-throughput buffering requirements. Verify that the required mailbox functionality aligns with the system's control signaling needs.

Part Context

This part belongs to the SN74ACT series of advanced CMOS logic devices manufactured by Texas Instruments. It is pin-to-pin compatible with the SN74ACT3631 and SN74ACT3641 models, facilitating direct upgrades or replacements within existing designs. The device utilizes low-power 0.8-micron technology to achieve high performance while maintaining power efficiency standards typical of the ACT family.

Replacement Considerations

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