SN74ACT3632-20PQ

Overview

The SN74ACT3632-20PQ is a high-speed, low-power CMOS clocked bidirectional FIFO memory featuring two independent 512 × 36 dual-port SRAMs. It supports clock frequencies up to 67 MHz with read access times as fast as 11 ns. The device includes programmable almost-full and almost-empty flags synchronized to respective port clocks. Each FIFO has a 36-bit mailbox-bypass register for direct data transfer. It operates from 0°C to 70°C in a 132-pin Plastic Quad Flat (PQ) package.

Feature Summary

• Contains two independent 512 × 36 clocked FIFOs buffering data in opposite directions
• Includes mailbox-bypass registers for each FIFO to bypass the main memory array
• Features programmable almost-full and almost-empty status flags synchronized to port clocks
• Supports asynchronous or coincident free-running clocks for Port A and Port B

Applications

• Buffering data between microprocessors and buses with synchronous control
• Interfacing with floating-point digital signal processors
• Initializing DMA control using bypass registers
• Creating wider datapaths by connecting multiple devices in parallel

Procurement Notes

Verify the specific -20 speed grade suffix against current Texas Instruments documentation, as datasheets may list generic SN74ACT3632 specifications. Confirm the PQ package designation matches the required 132-pin plastic quad flat form factor. Ensure the operating temperature range of 0°C to 70°C aligns with system environmental requirements before procurement.

Selection Notes

Select this component when designing systems requiring dual-port synchronous FIFO buffering with 36-bit data widths. It is suitable for applications needing independent clock domains for write and read ports. Consider the mailbox feature if direct command passing between ports is necessary without queuing through the main memory array.

Part Context

This part belongs to the SN74ACT3632 family of advanced CMOS clocked FIFO memories. It is pin-to-pin compatible with the SN74ACT3622 and SN74ACT3642 variants. The device utilizes low-power 0.8-micron technology and is characterized for commercial temperature ranges. It serves as a specialized memory interface solution within the broader logic IC category.

Replacement Considerations

The SN74ACT3622 and SN74ACT3642 are documented as pin-to-pin compatible substitutes. Verify that any replacement maintains the required 36-bit width and synchronous clocking characteristics. Ensure the substitute part supports the necessary 67 MHz clock frequency and 11 ns access time.