SN74V3640-7PEU

Overview

The SN74V3640 is a 1024 × 36 bit, 3.3-V CMOS first-in, first-out (FIFO) memory fabricated using high-performance submicron technology. It supports 166-MHz operation with a 6-ns read/write cycle time and features independent read and write clocks. The device offers user-selectable bus sizing for input and output ports in widths of 36, 18, or 9 bits. It includes big-endian/little-endian selectable byte representation, 5-V tolerant inputs, and programmable almost-empty and almost-full flags.

Feature Summary

• Supports flexible bus matching with configurable input and output port widths of 36, 18, or 9 bits to match unequal data buses.
• Provides zero-latency retransmit capability allowing previously read data to be accessed again without disturbing the write pointer.
• Features user-selectable standard timing mode or first-word fall-through (FWFT) timing mode for optimized data access latency.

Applications

• Network buffering systems requiring large data storage capacity
• Video signal processing applications needing bus size adaptation
• Telecommunications equipment utilizing asynchronous clock domains
• Data communications interfaces managing high-speed data flow

Procurement Notes

Verify that the specific part number matches the required memory depth of 1024 x 36 bits. Confirm the package type is 128-pin Thin Quad Flat Pack (TQFP). Ensure the operating temperature range meets the application requirements of 0°C to 70°C. Check datasheet specifications for power supply voltage levels and timing constraints before integration.

Selection Notes

Select this component when deep FIFO memory with high-speed submicron CMOS performance is required. Choose the SN74V3640 specifically for its 1024 x 36 bit organization compared to deeper variants like the SN74V3680. Consider the need for independent read/write clocks and flexible bus matching capabilities. Evaluate the requirement for 5-V tolerant inputs if interfacing with different logic families.

Part Context

This device belongs to the SN74V36xx series of 3.3-V CMOS FIFO memories from Texas Instruments. The series includes variants with increasing depths: SN74V3650 (2048), SN74V3660 (4096), SN74V3670 (8192), SN74V3680 (16384), and SN74V3690 (32768). All share identical functional characteristics and pinouts, differing only in memory depth.

Replacement Considerations

Direct substitutes within the same family include SN74V3650, SN74V3660, SN74V3670, SN74V3680, and SN74V3690. These parts are pin-compatible but offer different memory depths. Verify that the alternative depth meets the system's buffering requirements.