Texas Instruments SN74V3660-7PEU

Overview

SN74V3660-7PEU 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 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 alignment systems.

For engineers reviewing the SN74V3660-7PEU datasheet, SN74V3660-7PEU pinout, SN74V3660-7PEU application, or SN74V3660-7PEU equivalent, key selection criteria include its 4096 × 36-bit depth, 5-V-tolerant inputs, dual-clock domain support, FWFT/standard mode configurability, and 128-pin TQFP package with validated bus-matching control logic.

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 fixed first-word latency (3 RCLK cycles in FWFT mode) and zero-latency retransmit when RM is low during master reset.

Bus sizing is determined at power-up via BM, IW, and OW pins, enabling five configurations including ×36-in/×9-out and ×9-in/×36-out. Big-endian/little-endian byte ordering, interspersed/noninterspersed parity selection, and synchronous/asynchronous PAE/PAF flag timing are all configured during master reset using BE, IP, and PFM pins.

Key Specifications

Pinout & Package

SN74V3660-7PEU is housed in a 128-pin Thin Quad Flat Pack (TQFP) with 0.4-mm lead pitch, JEDEC MO-220 compliant, and thermally optimized for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V3680L15PF and NB3N502M, SN74V3660-7PEU uniquely balances mid-density (4096 × 36), 166-MHz speed, full bus-matching, FWFT timing, and zero-latency retransmit - making it optimal for real-time protocol processing where latency determinism and interface flexibility are critical.

Availability

SN74V3660-7PEU is available at Aetrix Electronics and suitable for network packet buffering, video frame alignment, and telecom line card bridging requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for SN74V3660-7PEU 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 leadership in high-speed interface ICs and memory products.

SN74V3660-7PEU belongs to TI's high-performance FIFO memory family designed specifically for clock-domain bridging, bus-width adaptation, and deterministic data buffering in networking, video, and telecommunications infrastructure.

FAQ

What is the memory organization of the SN74V3660-7PEU?

The SN74V3660-7PEU implements a 4096 × 36-bit synchronous FIFO memory array, delivering 147,456 bits of total buffer capacity. This organization is fixed for this specific part number and distinct from other members of the SN74V36xx family such as the SN74V3640 (1024 × 36) or SN74V3670 (8192 × 36). The SN74V3660-7PEU does not support dynamic reconfiguration of depth or width beyond its defined 4096 × 36 structure.

Does the SN74V3660-7PEU support 5-V logic inputs?

Yes, the SN74V3660-7PEU features 5-V-tolerant inputs across all control and data pins (including WEN, REN, MRS, D0–D35, etc.), allowing direct connection to 5-V CMOS or TTL logic without external level shifters. This tolerance applies regardless of the 3.3-V VCC supply and is explicitly specified in the SCAS668A datasheet. The SN74V3660-7PEU outputs (Q0–Q35) are not 5-V tolerant and must interface with 3.3-V receivers.

How is bus matching configured on the SN74V3660-7PEU?

Bus matching on the SN74V3660-7PEU is configured at master reset using the BM (bus matching), IW (input width), and OW (output width) pins. These three inputs select one of five valid configurations: ×36-in/×36-out, ×36-in/×18-out, ×36-in/×9-out, ×18-in/×36-out, or ×9-in/×36-out. The configuration is latched during MRS assertion and remains fixed until the next master reset. The SN74V3660-7PEU does not support runtime bus-width reconfiguration.

What is the difference between master reset (MRS) and partial reset (PRS) on the SN74V3660-7PEU?

Master reset (MRS) initializes read/write pointers to zero, clears the output register, and reconfigures all mode settings (FWFT/standard, bus width, endianness, flag timing, retransmit latency) based on pin states. Partial reset (PRS) resets only the read/write pointers and output register while preserving all configuration settings - including FWFT mode, PAE/PAF offsets, and programming method. PRS is used for mid-operation recovery without losing runtime configuration in the SN74V3660-7PEU.

Can the SN74V3660-7PEU operate with different read and write clock frequencies?

Yes, the SN74V3660-7PEU fully supports independent read (RCLK) and write (WCLK) clocks operating at any frequency from 0 to 166 MHz, with no phase or frequency relationship required. The device uses asynchronous pointer logic to manage data coherency across domains. Flag updates (e.g., EF, FF, HF) are synchronized to their respective clocks - RCLK updates EF/OR and PAE, while WCLK updates FF/IR and PAF - ensuring reliable status reporting in the SN74V3660-7PEU.