SN74V3660-6PEU

Overview

The SN74V3660-6PEU is a 3.3-V CMOS first-in, first-out (FIFO) memory with a 4096 × 36 bit organization and 128-pin TQFP package. It supports 166-MHz operation with a 6-ns read/write cycle time. The device features user-selectable bus sizing for input and output ports at widths of 36, 18, or 9 bits. It includes big-endian/little-endian selectable byte representation, 5-V tolerant inputs, and fixed low first-word latency. The FIFO offers zero-latency retransmit, master reset, partial reset, and programmable almost-empty/full flags.

Feature Summary

• Supports flexible bus matching with configurable input and output port widths of 36, 18, or 9 bits.
• Provides big-endian and little-endian user-selectable byte representation for data formatting.
• Features independent read and write clocks allowing simultaneous reading and writing operations.
• Includes programmable almost-empty and almost-full flags with selectable synchronous or asynchronous timing modes.

Applications

• Network buffering applications requiring large data storage capacity
• Video signal processing systems needing bus size matching
• Telecommunications equipment utilizing high-speed data transfer
• Data communications interfaces managing unequal bus sizes

Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature range. Confirm that the revision level aligns with current production data specifications. Ensure compatibility with system voltage levels and interface requirements before finalizing procurement decisions.

Selection Notes

Select this component when a deep, high-speed FIFO with flexible bus matching is required. Consider the 4096-word depth and 36-bit width capabilities. Evaluate the need for independent clock domains and programmable flag offsets. Verify that the 128-pin TQFP package fits the design constraints.

Part Context

This part belongs to the SN74V36xx series of 3.3-V CMOS FIFO memories from Texas Instruments. The series includes variants with different depths ranging from 1024 to 32768 words, all maintaining a 36-bit word width. These devices are designed for high-performance submicron CMOS technology applications.

Replacement Considerations

Compatible substitutes within the same family include SN74V3640, SN74V3650, SN74V3670, SN74V3680, and SN74V3690. Selection depends on required memory depth. All variants share identical pinouts and functional characteristics except for storage capacity.

FAQ

How is the bus width configured?

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

What is the difference between standard mode and FWFT mode?

In standard mode, every read requires REN and RCLK. In FWFT mode, the first word appears automatically after three RCLK edges without REN, while subsequent words require REN.