SN74V3680-6PEU

Overview

The SN74V3680-6PEU is a 16384 x 36 synchronous FIFO memory manufactured by Texas Instruments. It operates on a 3.3-V CMOS supply with a maximum clock frequency of 166 MHz and a read/write cycle time of 6 ns. The device features independent read and write clocks, user-selectable bus sizing (x36, x18, or x9), and supports both standard and first-word fall-through timing modes. It includes programmable almost-empty and almost-full flags, retransmit capabilities, and big-endian/little-endian byte representation options.

Feature Summary

• Supports flexible bus matching with selectable input and output port widths of 36, 18, or 9 bits.
• Features independent read and write clocks allowing simultaneous data operations.
• Includes programmable almost-empty and almost-full flags with selectable offset thresholds.
• Provides zero-latency retransmit functionality for rereading data from the FIFO.

Applications

• Network buffering
• Video signal processing
• Telecommunications systems
• Data communications interfaces

Procurement Notes

Verify the specific ordering suffix '6PEU' to confirm the 6-ns speed grade and LQFP-128 package variant. Ensure compatibility with 3.3-V logic levels and check for RoHS compliance status in the latest datasheet revision before finalizing procurement specifications.

Selection Notes

Select this component when deep memory depth combined with high-speed operation is required. Consider the SN74V3680 series for applications needing variable bus width matching between disparate system components. Evaluate the need for FWFT mode versus standard mode based on latency requirements.

Part Context

This part belongs to the SN74V36xx family of 3.3-V CMOS FIFO memories. Other members include SN74V3640 through SN74V3690, which vary primarily in memory depth from 1024 to 32768 words while maintaining the same 36-bit base width and interface characteristics.

Replacement Considerations

Direct substitutes within the same family include SN74V3680 variants with different speed grades or packages. Verify pinout compatibility and electrical specifications against the original design requirements before substitution.

FAQ

What determines the bus width configuration?

The bus width is configured during master reset using the BM, IW, and OW pins to select input and output widths of 36, 18, or 9 bits.

How does the retransmit function work?

Asserting the RT input low during a rising RCLK edge resets the read pointer to the start of the memory, allowing data to be reread without disturbing the write pointer.