Texas Instruments SN74V3660-15PEU

Overview

SN74V3660-15PEU from Texas Instruments is a 4096 × 36-bit, 3.3-V CMOS synchronous FIFO memory with independent read/write clocks, user-selectable ×36/×18/×9 bus matching, and 166-MHz operation (6-ns read/write cycle time). It supports FWFT or standard timing modes, zero-latency retransmit, and programmable almost-empty/almost-full flags - deployed in high-throughput network buffering and video data stream alignment.

For engineers reviewing the SN74V3660-15PEU datasheet, SN74V3660-15PEU pinout, SN74V3660-15PEU application, or SN74V3660-15PEU equivalent, key selection criteria include bus-matching flexibility (×36 in to ×9 out), 5-V-tolerant inputs, fixed first-word latency, master/partial reset control, and TQFP-128 packaging for industrial PCB integration.

Technical Context

This FIFO implements dual-clock architecture with fully asynchronous WCLK and RCLK domains (0–166 MHz), enabling simultaneous write/read operations without clock domain synchronization logic. Its RAM array is paired with configurable flag logic supporting both FWFT (first-word fall-through) and standard timing modes, selected at master reset via FWFT/SI.

Bus sizing is determined by BM/IW/OW pins during master reset, enabling five configurations including ×36→×9 and ×9→×36. Big-endian/little-endian byte ordering, interspersed/noninterspersed parity control, and synchronous/asynchronous PAE/PAF timing are all configured at initialization and retained across partial resets.

Key Specifications

Pinout & Package

SN74V3660-15PEU is housed in a 128-pin Thin Quad Flat Pack (TQFP) with 0.4-mm lead pitch, RoHS-compliant, and rated for 0°C to 70°C operation. Pin functions are validated per TI SCAS668A datasheet (Rev. March 2003).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V3680L15PF and NB3N5002MNR2G, SN74V3660-15PEU uniquely delivers FWFT timing, zero-latency retransmit, and full ×36/×18/×9 bus-matching - making it the only option among the three capable of deterministic sub-10-ns first-word delivery in depth-expanded video chains.

Availability

SN74V3660-15PEU is available at Aetrix Electronics and suitable for network packet buffering, video frame synchronization, telecom line card data aggregation, industrial protocol gateway design, and high-reliability embedded buffering requiring stable component supply across multi-year production cycles.

Supply support for SN74V3660-15PEU 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-speed interface ICs and industrial-grade reliability.

SN74V3660-15PEU belongs to TI's high-performance synchronous FIFO product line, engineered for deterministic data buffering in bandwidth-intensive communications infrastructure and real-time video systems.

FAQ

What is the maximum operating frequency of the SN74V3660-15PEU?

The SN74V3660-15PEU supports up to 166 MHz on both WCLK and RCLK inputs, corresponding to a 6-ns read/write cycle time. This specification is guaranteed over the full commercial temperature range (0°C to 70°C) and 3.3-V ±0.3-V supply, as confirmed in the SCAS668A datasheet timing tables.

Does the SN74V3660-15PEU support 5-V logic inputs?

Yes, the SN74V3660-15PEU features 5-V-tolerant inputs on all control and data pins (WEN, REN, MRS, PRS, D0–D35, etc.), allowing direct connection to 5-V microcontrollers or FPGAs without level-shifting circuitry - a key advantage for mixed-voltage system upgrades.

How does the first-word fall-through (FWFT) mode work in the SN74V3660-15PEU?

In FWFT mode, the first word written to an empty SN74V3660-15PEU appears on Q0–Q35 after exactly three rising edges of RCLK, regardless of REN state. Subsequent words still require REN assertion. Mode selection is latched at master reset via the FWFT/SI pin, and the feature enables immediate data availability for time-critical video or packet header processing.

Can the SN74V3660-15PEU be expanded in depth using multiple devices?

Yes - the SN74V3660-15PEU supports depth expansion in FWFT mode by cascading outputs to inputs of another identical FIFO. No external logic is needed because the first-word output behavior propagates deterministically through the chain, preserving timing integrity across stages for large-frame buffering.

What package type is used for the SN74V3660-15PEU?

The SN74V3660-15PEU is supplied in a 128-pin Thin Quad Flat Pack (TQFP) with "PEU" suffix, measuring 14 mm × 14 mm, 0.4-mm lead pitch, and RoHS-compliant finish. This package is optimized for automated assembly and thermal performance in dense industrial PCB layouts.