Texas Instruments SN74V3650-15PEU

Overview

SN74V3650-15PEU from Texas Instruments is a 2048 × 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 operates up to 166 MHz (6-ns cycle time), supports 5-V-tolerant inputs, and delivers fixed low-latency retransmit and first-word access - deployed in high-speed network buffering, video frame synchronization, and telecom data bridging.

For engineers reviewing the SN74V3650-15PEU datasheet, SN74V3650-15PEU pinout, SN74V3650-15PEU application, or SN74V3650-15PEU equivalent, key selection considerations include its 2048-depth ×36-bit configuration, dual-clock domain operation, programmable almost-empty/almost-full flags with eight default offsets, zero-latency retransmit capability, and 128-pin TQFP package compatibility with depth/width expansion.

Technical Context

This FIFO implements a dual-port, clock-domain-isolated architecture with separate WCLK and RCLK inputs enabling simultaneous read/write at independent frequencies up to 166 MHz. Its RAM array is organized as 2048 words × 36 bits, supporting configurable bus widths via BM/IW/OW control pins during master reset.

Flag logic includes EF/OR, FF/IR, HF, PAE, and PAF - with PAE/PAF programmable via serial or parallel loading of offset registers, and timing mode (synchronous/asynchronous) selectable via PFM. Retransmit (RT) resets the read pointer with zero-latency option enabled by RM during MRS.

Key Specifications

Pinout & Package

SN74V3650-15PEU is housed in a 128-pin Thin Quad Flat Pack (TQFP) with 0.4-mm lead pitch and exposed thermal pad. The package supports JEDEC-standard reflow profiles and provides mechanical stability for high-frequency signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V3650L15PF and NB3N3020B, SN74V3650-15PEU uniquely combines 5-V-tolerant control inputs, full ×36/×18/×9 bus matching, and zero-latency retransmit - making it optimal for legacy-compatible, high-flexibility buffering in telecom and broadcast infrastructure.

Availability

SN74V3650-15PEU is available at Aetrix Electronics and suitable for network packet buffering, video frame synchronization, and telecom line card bridging requiring stable component supply across extended production lifecycles.

Supply support for SN74V3650-15PEU 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-performance memory interfaces and clock management ICs.

SN74V3650-15PEU belongs to TI's high-speed synchronous FIFO product line, engineered specifically for deterministic, low-latency data buffering in multi-clock-domain systems such as communications infrastructure, digital video, and industrial automation.

FAQ

What is the memory depth and width of the SN74V3650-15PEU?

The SN74V3650-15PEU provides a fixed memory organization of 2048 words × 36 bits, delivering 73.7 kbits of buffer capacity. This depth supports sustained burst-mode transfers in telecom and video applications without overflow under typical traffic loads. The ×36 width is configurable down to ×18 or ×9 on both input and output ports using BM, IW, and OW pins during master reset.

Does the SN74V3650-15PEU support 5-V logic inputs?

Yes, the SN74V3650-15PEU features 5-V-tolerant control inputs including WEN, REN, MRS, PRS, OE, RT, and all configuration pins (BM, IW, OW, BE, etc.). This allows direct interfacing with legacy 5-V microcontrollers or FPGAs without external level shifters - a key advantage over competing FIFOs that require strict 3.3-V signaling.

How does the first-word fall-through (FWFT) mode work in the SN74V3650-15PEU?

In FWFT mode, enabled by asserting FWFT/SI high during master reset, the first word written to an empty SN74V3650-15PEU appears on Q0–Q35 after exactly three rising edges of RCLK - with no REN assertion required. Subsequent words still require REN activation. This eliminates startup latency in real-time streaming applications like video frame capture or protocol analysis.

Can the SN74V3650-15PEU be used in zero-latency retransmit mode?

Yes, zero-latency retransmit is supported in the SN74V3650-15PEU when RM is held low during master reset. In this mode, asserting RT low on a rising RCLK edge causes the first retransmitted word to appear on Qn within the same clock cycle - essential for debugging tools, loopback testing, and deterministic replay in test instrumentation.

What package type is used for the SN74V3650-15PEU?

The SN74V3650-15PEU is packaged in a 128-pin Thin Quad Flat Pack (TQFP) with suffix "PEU", measuring 14 mm × 14 mm and featuring 0.4-mm lead pitch. This RoHS-compliant package supports standard reflow soldering, offers excellent thermal dissipation via the exposed pad, and is widely supported by PCB layout tools and contract manufacturers.