SN74V3690-15PEU

Overview

The SN74V3690-15PEU is a 3.3-V CMOS first-in, first-out (FIFO) memory with a 32768 × 36 bit organization and 1179.6 kbit capacity. It operates at frequencies up to 166 MHz with a 6 ns read/write cycle time. The device features independent read and write clocks, user-selectable bus sizing (×36/×18/×9), and big-endian/little-endian byte representation. It includes programmable almost-empty/full flags, selectable standard or first-word fall-through timing modes, and zero-latency retransmit capabilities.

Feature Summary

• Supports flexible bus matching with configurable input and output port widths of 36, 18, or 9 bits.
• Provides selectable standard timing mode or first-word fall-through (FWFT) mode for data access.
• Features independent read and write clock domains allowing simultaneous operations.
• Includes programmable almost-empty and almost-full flags with selectable synchronous or asynchronous timing.

Applications

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

Procurement Notes

Verify the specific suffix '15PEU' against the manufacturer's current datasheet to confirm pinout compatibility and electrical specifications. Ensure the design supports the required 3.3-V supply voltage and 5-V tolerant inputs if interfacing with legacy logic. Confirm that the 128-pin TQFP package dimensions align with the target PCB layout constraints.

Selection Notes

Select this component when deep memory depth of 32768 words is required alongside high-speed 166 MHz operation. Choose this part over smaller variants like the SN74V3680 if the application demands larger buffer capacities. Consider the FWFT mode requirement and bus-matching needs to ensure the control pins are configured correctly during the master reset cycle.

Part Context

This device belongs to the SN74V36x0 family of high-performance submicron CMOS FIFO memories. It shares architectural similarities with the SN74V3640 through SN74V3680 but offers increased storage density. The family is designed for applications requiring large data buffers and unequal bus size matching in high-speed digital systems.

Replacement Considerations

SN74V3690-6PEU