Renesas 72V255LA10TFG

Overview

72V255LA10TFG from Integrated Device Technology is a 3.3 V, 8,192 × 18-bit synchronous First-In-First-Out (FIFO) memory IC with independent read/write clocks, 10 ns clock cycle time, fixed low-latency first-word access, and programmable almost-empty/almost-full flags. It serves as a high-speed data buffering interface in network packet processors and telecom line cards requiring deterministic timing and depth expansion capability.

For engineers reviewing the 72V255LA10TFG datasheet, 72V255LA10TFG pinout, 72V255LA10TFG application, or 72V255LA10TFG equivalent, key selection criteria include its 3.3 V operation, TQFP-64 industrial-grade packaging, FWFT/IDT Standard timing mode flexibility, 5 V input tolerance, and auto power-down for low standby current in burst-mode systems.

Technical Context

This FIFO implements dual-clock architecture with fully asynchronous RCLK and WCLK-no frequency ratio constraints, eliminating the FS pin required in prior SuperSync generations. Its internal block includes separate input/output registers, RAM array, flag logic, and offset registers supporting serial or parallel programming of PAE/PAF thresholds.

The device supports two mutually exclusive timing modes selected at Master Reset: IDT Standard (EF/FF flags, REN-gated reads) and First Word Fall Through (OR/IR flags, immediate first-word output after three RCLK edges). Retransmit (RT) and Partial Reset (PRS) enable non-disruptive mid-operation recovery without losing flag configurations.

Key Specifications

Pinout & Package

64-pin Slim Thin Quad Flat Pack (STQFP), 10 mm × 10 mm body, 0.5 mm lead pitch, RoHS-compliant green finish (Pb-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V255LA10PF, the 72V255LA10TFG offers identical performance in a smaller STQFP package ideal for high-density designs; versus NB3N502DG, it delivers deeper buffering, flexible timing modes, and advanced flag control essential for telecom and video systems.

Availability

72V255LA10TFG is available at Aetrix Electronics and suitable for network packet processors, video frame synchronizers, telecom line cards, industrial protocol gateways, and embedded data concentrators requiring stable component supply across industrial temperature ranges.

Supply support for 72V255LA10TFG 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions.

The IDT72V255LA belongs to the SuperSync™ FIFO family, designed specifically for high-speed, low-latency data buffering in networking, telecommunications, and video infrastructure where deterministic timing and depth scalability are critical.

FAQ

What is the memory organization of the 72V255LA10TFG?

The 72V255LA10TFG implements an 8,192 × 18-bit (147,456-bit total) synchronous FIFO memory structure. This configuration supports 18-bit parallel data paths with full depth addressing, enabling robust buffering for multi-byte protocols such as Gigabit Ethernet frames or uncompressed video lines. The 72V255LA10TFG does not support other widths or depths - it is strictly an 8K × 18 device.

Does the 72V255LA10TFG support both IDT Standard and FWFT timing modes?

Yes, the 72V255LA10TFG supports both timing modes. The mode is selected at Master Reset via the FWFT/SI pin state: LOW selects IDT Standard (EF/FF flags, REN-gated reads), HIGH selects First Word Fall Through (OR/IR flags, immediate first-word output). Both modes are fully supported in the 72V255LA10TFG and retain all flag functions, programmable offsets, and retransmit capability.

What is the purpose of the LD pin on the 72V255LA10TFG?

The LD (Load) pin on the 72V255LA10TFG serves two critical roles: during Master Reset, it selects serial (LD = HIGH) or parallel (LD = LOW) programming of PAE/PAF offset registers and sets corresponding default values (1023 or 127 words). After reset, LD enables writing to or reading from those registers. It is essential for configuring custom flow-control thresholds without requiring external microcontroller intervention.

Can the 72V255LA10TFG be used in depth-expansion configurations?

Yes, the 72V255LA10TFG supports depth expansion exclusively in FWFT mode by cascading multiple devices - Q0–Q17 outputs connect directly to D0–D17 inputs of the next FIFO. No external logic is needed because FWFT guarantees immediate first-word availability and synchronized flag propagation. This capability is confirmed in the official IDT documentation for the 72V255LA10TFG and is not supported in IDT Standard mode.

What is the significance of the "10" in the 72V255LA10TFG part number?

"10" in 72V255LA10TFG denotes the 10 ns clock cycle time speed grade, corresponding to a maximum operating frequency of 100 MHz. This is verified in the AC Electrical Characteristics table, where tCLK = 10 ns (min) defines the fastest guaranteed timing. The 72V255LA10TFG is distinct from 15 ns (72V255LA15TFG) and 20 ns (72V255LA20TFG) variants, which have lower maximum frequencies and relaxed timing margins.