Texas Instruments SN74V3640-10PEU

Overview

SN74V3640-10PEU from Texas Instruments is a 3.3-V CMOS, 1024 × 36-bit synchronous FIFO memory with independent read/write clocks, user-selectable bus matching (×36/×18/×9), and first-word fall-through (FWFT) or standard timing modes. It delivers 166-MHz operation (6-ns read/write cycle time), 5-V-tolerant inputs, and zero-latency retransmit capability - deployed in high-speed network packet buffering and video frame synchronization systems.

For engineers reviewing the SN74V3640-10PEU datasheet, SN74V3640-10PEU pinout, SN74V3640-10PEU application, or SN74V3640-10PEU equivalent, key selection criteria include configurable bus-width matching, programmable almost-empty/almost-full flags with eight default offsets, big/little-endian byte ordering, asynchronous/synchronous flag timing control, and 128-pin TQFP packaging with 5-V-tolerant inputs and 3.3-V core operation.

Technical Context

This FIFO implements dual-clock architecture with fully independent WCLK and RCLK domains (0–166 MHz), enabling simultaneous write/read operations without arbitration. Its RAM array is paired with dedicated input/output registers, pointer logic, and flag generation circuitry supporting both FWFT (first-word appears after three RCLK edges) and standard (read-enable required for all words) timing modes.

Bus-matching configuration is determined at master reset via BM/IW/OW pins, selecting among five port-width combinations (e.g., ×36 in → ×9 out). Flag behavior is further refined by PFM (asynchronous/synchronous PAE/PAF), BE (big/little-endian word alignment), and IP (interspersed/noninterspersed parity during offset programming).

Key Specifications

Pinout & Package

SN74V3640-10PEU is housed in a 128-pin Thin Quad Flat Pack (TQFP) with 0.4-mm lead pitch and exposed thermal pad. Pin functions are validated per TI SCAS668A datasheet (Rev. March 2003), with all I/Os assigned per top-view package diagram.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FIFO memory applications.

Compared with IDT72V3640L10PF, SN74V3640-10PEU offers FWFT timing and zero-latency retransmit for lower system latency, while its TQFP package supports higher-density PCB layouts; NB3N502DR2G is not a functional substitute and must be excluded from FIFO replacement analysis.

Availability

SN74V3640-10PEU is available at Aetrix Electronics and suitable for network packet buffering, video frame synchronization, telecom line card interface, industrial data acquisition, and high-speed protocol bridging requiring stable component supply and long-term manufacturability.

Supply support for SN74V3640-10PEU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-performance timing and interface ICs.

The SN74V36xx family was designed specifically for high-bandwidth, low-latency data buffering in communications infrastructure - delivering deep, configurable FIFOs optimized for clock-domain isolation and bus-width translation in telecom, video, and networking equipment.

FAQ

What is the maximum operating frequency of the SN74V3640-10PEU?

The SN74V3640-10PEU supports up to 166 MHz for both read and write clocks, corresponding to a 6-ns read/write cycle time. This specification is guaranteed across the full commercial temperature range (0°C to +70°C) and 3.3-V ±0.3-V supply, as confirmed in the TI SCAS668A datasheet. The device maintains timing integrity even with asynchronous WCLK and RCLK frequencies.

Does the SN74V3640-10PEU support 5-V input signals?

Yes, the SN74V3640-10PEU features 5-V-tolerant inputs on all D0–D35, control, and configuration pins (e.g., WEN, REN, MRS, BM, IW, OW). This allows direct interfacing with 5-V microcontrollers or FPGAs without level shifters, while the core logic remains powered at 3.3 V - a key advantage verified in the "Electrical Characteristics" section of the TI datasheet.

How does the first-word fall-through (FWFT) mode work in the SN74V3640-10PEU?

In FWFT mode, enabled by asserting FWFT/SI high during master reset, the first word written to an empty SN74V3640-10PEU appears on Q0–Q35 after exactly three rising edges of RCLK - without requiring REN to be asserted. Subsequent words still require REN activation. This behavior is hardware-implemented and deterministic, reducing latency in display and packet-forwarding applications.

Can the SN74V3640-10PEU be used in zero-latency retransmit mode?

Yes, zero-latency retransmit is supported in the SN74V3640-10PEU. When RM is held low during master reset, asserting RT low on a rising RCLK edge causes the first data word to appear on Q outputs on that same edge - with no additional clock delay. This feature is validated in Figures 13–14 of the SCAS668A datasheet and applies to both FWFT and standard timing modes.

What package type is used for the SN74V3640-10PEU?

The SN74V3640-10PEU is packaged in a 128-pin Thin Quad Flat Pack (TQFP) with 0.4-mm lead pitch and exposed thermal pad (PEU suffix). This RoHS-compliant package is specified in TI's official documentation and confirmed by the top-view pin diagram in the SCAS668A datasheet - distinct from PLCC or BGA variants used in other FIFO families.