Texas Instruments SN74V3680-10PEU

Overview

SN74V3680-10PEU from Texas Instruments is a 16,384 × 36-bit, 3.3-V CMOS synchronous FIFO memory with independent read/write clocks, user-selectable ×36/×18/×9 bus matching, and first-word fall-through (FWFT) or standard timing modes. It delivers 166-MHz operation (6-ns read/write cycle time), zero-latency retransmit capability, and programmable almost-empty/almost-full flags - deployed in high-throughput network buffering and video data stream alignment.

For engineers reviewing the SN74V3680-10PEU datasheet, SN74V3680-10PEU pinout, SN74V3680-10PEU application, or SN74V3680-10PEU equivalent, key selection criteria include its 16,384-word depth, 5-V-tolerant inputs, dual-clock domain support, FWFT/standard mode configurability, and TQFP-128 package compatibility for PCB layout reuse in telecom and signal processing systems.

Technical Context

This FIFO implements a dual-port, clock-domain-isolated architecture with separate WCLK and RCLK inputs enabling simultaneous read/write at up to 166 MHz. Its internal RAM array supports flexible bus sizing via BM/IW/OW control pins during master reset, allowing asymmetric configurations like ×36-in to ×9-out or ×9-in to ×36-out.

Flag logic includes EF/OR, FF/IR, HF, PAE, and PAF - with PAE/PAF programmable via serial or parallel loading and configurable for synchronous or asynchronous assertion timing using PFM. Retransmit (RT) with zero-latency mode (selected by RM at reset) resets the read pointer without disturbing write state or flag settings.

Key Specifications

Pinout & Package

SN74V3680-10PEU is housed in a 128-pin Thin Quad Flat Pack (TQFP) with 0.4-mm lead pitch, RoHS-compliant, and thermally optimized for convection-cooled PCB layouts. Pin functions are validated per TI SCAS668A datasheet (Rev. March 2003), with all I/O 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 IDT72V3680L10PF and NB3N3020B, SN74V3680-10PEU uniquely combines 16K-word depth, 5-V-tolerant inputs, FWFT mode, and fully programmable flags - making it the only option for high-reliability, mixed-voltage telecom and broadcast systems requiring deterministic low-latency replay and flexible bus adaptation.

Availability

SN74V3680-10PEU is available at Aetrix Electronics and suitable for network packet buffering, video frame alignment, telecom line card interfacing, DSP data pipeline bridging, and high-speed protocol translation requiring stable component supply across multi-year production cycles.

Supply support for SN74V3680-10PEU 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 decades of leadership in high-performance memory and interface ICs.

SN74V3680-10PEU belongs to TI's high-speed synchronous FIFO product line, engineered specifically for clock-domain isolation, burst-mode data buffering, and bus-matching in telecommunications infrastructure, broadcast video, and real-time signal processing systems.

FAQ

What is the maximum operating frequency of the SN74V3680-10PEU?

The SN74V3680-10PEU supports up to 166 MHz for both read and write operations, achieving a 6-ns read/write cycle time. This performance is guaranteed over the full commercial temperature range (0°C to +70°C) and with proper signal integrity design - including controlled-impedance traces and adequate power supply decoupling per TI SCAS668A layout guidelines.

Does the SN74V3680-10PEU support independent read and write clock domains?

Yes, the SN74V3680-10PEU features fully independent WCLK and RCLK inputs with no frequency or phase synchronization requirement. The device internally manages pointer arbitration and flag updates across domains, enabling robust operation in asynchronous systems such as FPGA-to-ASIC bridging or CPU-to-peripheral data staging - a core capability confirmed in the functional block diagram and timing specifications of the SN74V3680-10PEU datasheet.

How does the first-word fall-through (FWFT) mode work on the SN74V3680-10PEU?

In FWFT mode - selected by asserting FWFT/SI high during master reset - the first word written to an empty SN74V3680-10PEU appears on Q0–Q35 after exactly three rising edges of RCLK, without requiring REN assertion. Subsequent words still require REN activation. This behavior is hardware-implemented and deterministic, enabling immediate data availability in streaming protocols like SMPTE ST 2110 or PCIe payload forwarding.

Can the SN74V3680-10PEU be used to expand buffer depth beyond 16,384 words?

Yes, the SN74V3680-10PEU supports depth expansion via daisy-chaining in FWFT mode: the Q outputs of one device connect directly to the D inputs of the next, with shared RCLK and WCLK. No external logic is needed because FWFT ensures seamless handoff - the second device receives the first word immediately upon valid output from the first, preserving throughput and eliminating inter-FIFO latency gaps.

What is the purpose of the 5-V-tolerant inputs on the SN74V3680-10PEU?

The 5-V-tolerant inputs (WEN, REN, MRS, PRS, OE, FWFT/SI, BM, IW, OW, BE, RM, PFM, IP, FSEL0/1, LD, SEN) allow the SN74V3680-10PEU to interface directly with legacy 5-V logic families or mixed-voltage FPGAs without external level shifters. This tolerance is built into the input protection circuitry and verified across process/voltage/temperature corners - reducing system BOM count and improving signal integrity in telecom and industrial control applications.