Texas Instruments SN74V3680-7PEU

Overview

SN74V3680-7PEU 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 5-V-tolerant inputs - deployed in high-throughput network buffering and video data alignment systems.

For engineers reviewing the SN74V3680-7PEU datasheet, SN74V3680-7PEU pinout, SN74V3680-7PEU application, or SN74V3680-7PEU equivalent, key selection criteria include configurable bus-width matching, programmable almost-empty/almost-full flags with eight default offsets, FWFT vs. standard mode selection at reset, big/little-endian byte ordering, and 128-pin TQFP packaging for high-density PCB layouts.

Technical Context

This FIFO implements dual-clock architecture with fully asynchronous WCLK and RCLK domains, enabling simultaneous read/write operations without frequency constraints. Its RAM array supports 16,384 words × 36 bits, with fixed low first-word latency (three RCLK edges in FWFT mode) and zero-latency retransmit when RM is low during master reset.

Flag logic includes EF/OR, FF/IR, HF, PAE, and PAF - with PAE/PAF independently programmable via serial or parallel loading using LD, SEN, WEN, and REN. Bus configuration (BM/IW/OW), endianness (BE), parity mode (IP), and flag timing (PFM) are all latched during master reset and remain static thereafter.

Key Specifications

Pinout & Package

SN74V3680-7PEU is housed in a 128-pin Thin Quad Flat Pack (TQFP) package with 0.4-mm lead pitch and exposed thermal pad. Pin functions are defined during master reset and remain static; critical control pins include MRS, PRS, WCLK, RCLK, WEN, REN, OE, BM, IW, OW, BE, FWFT/SI, and RM.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V3680L15PF and NB3N502FG, SN74V3680-7PEU uniquely combines deep 16K×36 storage, 5-V-tolerant control, FWFT timing, and full ×36/×18/×9 bus matching - making it the sole option for high-throughput, mixed-voltage, multi-width buffering where deterministic latency and expandability are mandatory.

Availability

SN74V3680-7PEU is available at Aetrix Electronics and suitable for network packet buffering, video frame alignment, and telecom line card buffering requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74V3680-7PEU 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 experience in high-speed interface and memory products.

SN74V3680-7PEU belongs to TI's high-performance FIFO memory family designed for demanding data buffering, clock domain isolation, and bus-matching applications in networking, video, and telecommunications infrastructure.

FAQ

What is the maximum operating frequency of the SN74V3680-7PEU?

The SN74V3680-7PEU supports up to 166 MHz operation, 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 under nominal 3.3-V supply conditions. Performance remains stable with independent WCLK and RCLK frequencies - no synchronization or ratio constraints apply.

How does the SN74V3680-7PEU handle bus-width mismatches between input and output ports?

The SN74V3680-7PEU supports five bus-matching configurations via BM, IW, and OW pins during master reset: ×36-in to ×36-out, ×36-in to ×18-out, ×36-in to ×9-out, ×18-in to ×36-out, and ×9-in to ×36-out. This eliminates external data-width conversion logic and preserves signal integrity by keeping data path routing internal to the device.

Can the SN74V3680-7PEU be used in systems with both 3.3-V and 5-V logic components?

Yes - the SN74V3680-7PEU features 5-V-tolerant control inputs (MRS, PRS, WEN, REN, OE, BM, IW, OW, BE, FWFT/SI, RM, PFM, FSEL0, FSEL1, LD, SEN), allowing direct interface with 5-V microcontrollers or FPGAs without level shifters. However, data I/O pins (D0–D35, Q0–Q35) are not 5-V tolerant and must operate within 3.3-V logic levels.

What is the difference between master reset (MRS) and partial reset (PRS) on the SN74V3680-7PEU?

Master reset (MRS) initializes read/write pointers, clears all flags, sets output register to zero, and reconfigures all mode settings (FWFT/standard, bus width, endianness, flag defaults, timing modes). Partial reset (PRS) resets only pointers and flags while retaining all programmable settings - ideal for mid-operation recovery without reinitializing configuration registers.

Does the SN74V3680-7PEU support retransmission of data, and how is latency controlled?

Yes - the SN74V3680-7PEU supports retransmit via the RT pin. Retransmit latency is selected during master reset using the RM pin: low enables zero-latency mode (first retransmitted word appears on Qn synchronized to the same RCLK edge that asserts RT), while high selects normal-latency mode (requiring additional RCLK edges for output registration).