Texas Instruments SN74V3670-15PEU

Overview

SN74V3670-15PEU from Texas Instruments is a 8192 × 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 cycle time), zero-latency retransmit capability, and programmable almost-empty/almost-full flags - deployed in high-throughput network packet buffering and video frame synchronization.

For engineers reviewing the SN74V3670-15PEU datasheet, SN74V3670-15PEU pinout, SN74V3670-15PEU application, or SN74V3670-15PEU equivalent, key selection criteria include bus-matching flexibility (×36 in to ×9 out), big-/little-endian byte ordering, 5-V-tolerant inputs, fixed first-word latency, and dual-mode flag timing (synchronous/asynchronous).

Technical Context

This FIFO implements a dual-clock architecture with fully independent WCLK and RCLK domains (0–166 MHz), enabling simultaneous write/read operations without arbitration. Its RAM array supports configurable depth-width mapping via BM/IW/OW pins during master reset, allowing dynamic port sizing across six discrete configurations.

Flag logic integrates five status outputs (EF/OR, FF/IR, HF, PAE, PAF) with mode-dependent behavior: EF/FF active in standard mode; OR/IR active in FWFT mode; HF, PAE, and PAF always available. PAE and PAF offsets are programmable via serial (FWFT/SI + SEN) or parallel (Dn + WEN) loading, with eight factory-default thresholds selectable via FSEL0/FSEL1/LD.

Key Specifications

Pinout & Package

SN74V3670-15PEU is housed in a 128-pin Thin Quad Flat Pack (TQFP) package with 0.4-mm lead pitch and exposed thermal pad. Pin assignments follow TI SCAS668A revision March 2003 specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V3680L15PF and NB3N502FG, SN74V3670-15PEU uniquely combines 5-V-tolerant inputs, full bus-matching configurability, zero-latency retransmit, and eight-programmable-flag-offset granularity - making it optimal for heterogeneous, high-reliability interface bridging where voltage compatibility and flexible data alignment are mandatory.

Availability

SN74V3670-15PEU is available at Aetrix Electronics and suitable for network packet buffering, video frame synchronization, telecom line card interface, signal processing pipelines, and high-speed data acquisition systems requiring stable component supply across extended production lifecycles.

Supply support for SN74V3670-15PEU 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 and interface ICs.

The SN74V3670-15PEU belongs to TI's high-speed synchronous FIFO product line, engineered specifically for clock-domain isolation and bus-width adaptation in networking, video, and telecommunications infrastructure equipment.

FAQ

What is the memory organization of the SN74V3670-15PEU?

The SN74V3670-15PEU implements an 8192 × 36-bit first-in, first-out memory array, delivering 294,912 bits of buffer storage. This organization supports deep buffering for high-bandwidth applications such as packet switching and video frame alignment, and is fixed per device variant - unlike family members SN74V3640 (1024×36) or SN74V3680 (16384×36).

Does the SN74V3670-15PEU support both FWFT and standard timing modes?

Yes, the SN74V3670-15PEU supports both first-word fall-through (FWFT) and standard timing modes. The FWFT/SI pin determines mode selection during master reset: high enables FWFT (first word appears after three RCLK edges without REN), low enables standard mode (all reads require REN assertion). Both modes are fully supported across all bus-matching configurations.

How does bus matching work on the SN74V3670-15PEU?

Bus matching on the SN74V3670-15PEU is controlled by BM, IW, and OW pins during master reset. These inputs configure five valid combinations: ×36→×36, ×36→×18, ×36→×9, ×18→×36, and ×9→×36. Unused data pins (e.g., D18–D35 in ×18 mode) are don't-care, eliminating need for external multiplexing or padding logic.

What is the purpose of the RM pin on the SN74V3670-15PEU?

The RM (Retransmit Latency Mode) pin on the SN74V3670-15PEU selects zero-latency or normal-latency retransmit operation during master reset. A low RM enables zero-latency mode: the first retransmitted word appears on Qn synchronously with the RCLK edge that asserts RT. This ensures deterministic retry timing critical in packet-forwarding applications.

Can the SN74V3670-15PEU be used in mixed-voltage systems?

Yes, the SN74V3670-15PEU features 5-V-tolerant inputs (WEN, REN, WCLK, RCLK, MRS, PRS, etc.), allowing direct interface with 5-V control logic while operating from a 3.3-V supply. This eliminates level-shifters in legacy system upgrades or hybrid voltage designs - a capability not present in many competing FIFOs like the IDT72V3680L15PF.