SN74ACT3632-30PQ

Overview

The SN74ACT3632-30PQ 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 synchronous FIFOs buffering data in opposite directions
• Includes 36-bit mailbox-bypass registers for each FIFO to bypass standard queuing
• Features programmable almost-full and almost-empty status flags synchronized to port clocks
• Supports asynchronous or coincident clocking between Port A and Port B

Applications

• Buffering data streams 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 -30 speed grade suffix against the specific datasheet revision, as the primary documentation references the base SN74ACT3632 model. Confirm the PQ package designation matches the 132-pin Plastic Quad Flat requirement. Ensure the operating temperature range of 0°C to 70°C aligns with system environmental constraints before finalizing procurement.

Selection Notes

Select this component when designing systems requiring high-speed bidirectional data buffering with independent clock domains. The ACT logic family provides compatibility with standard TTL interfaces while offering lower power consumption than older S-TTL variants. Consider the 36-bit data width and 512-word depth for applications needing substantial buffer capacity without external memory expansion.

Part Context

This part belongs to the Texas Instruments SN74ACT3632 series of clocked bidirectional FIFO memories. It is pin-to-pin compatible with the SN74ACT3622 and SN74ACT3642 models, facilitating design upgrades or variations within the same footprint. The series utilizes advanced 0.8-micron CMOS technology to achieve high performance at low power levels.

Replacement Considerations

The SN74ACT3622 and SN74ACT3642 are confirmed pin-to-pin compatible substitutes within the same product family.