Renesas 72V205L15PFGI

Overview

72V205L15PFGI from Integrated Device Technology (IDT) is a 3.3 V CMOS synchronous FIFO memory with 256 × 18-bit depth and width, supporting dual-clock or single-clock operation, 10 ns read/write cycle time, 5 V input tolerance, and industrial temperature range (–40°C to +85°C). It serves as a high-speed data buffer in optical disk controllers, LAN interfaces, and interprocessor communication links.

For engineers reviewing the 72V205L15PFGI datasheet, 72V205L15PFGI pinout, 72V205L15PFGI application, or 72V205L15PFGI equivalent, key selection criteria include its 15 ns speed grade, TQFP-64 package, programmable almost-empty/empty flags, FWFT vs. IDT Standard timing mode configuration, and daisy-chain depth expansion capability via WXI/WXO/RXI/RXO pins.

Technical Context

The 72V205L15PFGI implements a clocked, dual-port RAM array with independent read and write pointers, configurable flag timing (synchronous/asynchronous), and register-buffered EF/FF outputs selectable at reset via FL/RXI/WXI pins. Its functional block includes input/output registers, offset logic for PAE/PAF, and expansion control for depth scalability.

It supports two distinct timing modes-IDT Standard and First Word Fall Through (FWFT)-determined by FL/RXI/WXI states during reset. In FWFT mode, the first written word appears on Q0–Q17 after three RCLK edges without requiring REN assertion, enabling zero-latency output readiness for burst-mode systems.

Key Specifications

Pinout & Package

72V205L15PFGI is housed in a 64-lead thin quad flatpack (TQFP) package, designated PFGI per IDT ordering nomenclature, with 0.5 mm lead pitch and exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 72V205L10PFGI and 72V205L20PFGI, the 72V205L15PFGI strikes a balance between speed (66.7 MHz), power (≤30 mA active), and timing margin-making it optimal for mid-range industrial networking and real-time control where 15 ns latency is acceptable and 10 ns is unnecessary overhead.

Availability

72V205L15PFGI is available at Aetrix Electronics and suitable for optical disk controllers, industrial Ethernet bridges, interprocessor communication links, and motor drive feedback aggregation requiring stable component supply across extended product lifecycles.

Supply support for 72V205L15PFGI 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019. IDT pioneered high-performance FIFO architectures for data-intensive embedded systems.

The IDT72V2xx family-including 72V205L15PFGI-was designed for low-latency, clock-domain-bridging applications in industrial, telecom, and storage systems where deterministic buffering and programmable flow control are critical.

FAQ

What is the maximum operating frequency of the 72V205L15PFGI?

The 72V205L15PFGI has a 15 ns clock cycle time, supporting a maximum clock frequency of 66.7 MHz for both read and write operations under industrial temperature conditions (–40°C to +85°C) and 3.3 V supply. This is confirmed in the AC Electrical Characteristics table (page 5), where tCLK = 15 ns defines the commercial/industrial speed grade. The device maintains timing compliance across its full specified voltage and temperature range without derating.

Does the 72V205L15PFGI support both single-clock and dual-clock operation?

Yes, the 72V205L15PFGI supports both configurations: RCLK and WCLK may be tied together for single-clock operation, or driven independently for dual-clock mode-enabling clock domain bridging between asynchronous subsystems. The functional description (page 2) explicitly states this flexibility, and timing diagrams (Figures 9–14, 20–27) validate operation under both conditions with appropriate setup/hold constraints.

How is the First Word Fall Through (FWFT) mode enabled on the 72V205L15PFGI?

FWFT mode is configured during hardware reset (RS LOW) by setting specific logic levels on FL, RXI, and WXI pins per Table 3: FL = 0, RXI = 0, WXI = 1 selects FWFT with triple-buffered OR and double-buffered IR flags and asynchronous PAE/PAF. This configuration is latched at reset release and remains active until next reset; no software or register writes are involved.

Can the programmable almost-empty and almost-full offsets be modified after power-up?

Yes, the 72V205L15PFGI allows runtime reprogramming of PAE and PAF offset values using the LD pin and D0–D11 inputs. With LD and WEN held LOW, successive WCLK rising edges load empty offset (first edge), full offset (second edge), and empty offset again (third edge). The process is detailed in Figures 2 and 3 and the "Programmable Flag Loading" section (page 6).

Is the 72V205L15PFGI pin-compatible with other members of the IDT72V2xx family?

No-while all IDT72V2xx devices share the same 64-pin TQFP package and core signal mapping (D0–D17, Q0–Q17, WCLK, RCLK, etc.), depth-specific behavior (e.g., HF toggle point at 129 words for 72V205 vs. 257 for 72V215) and default offset values differ. Direct substitution without firmware/hardware validation risks incorrect flag assertion and buffer overflow/underflow in systems relying on depth-dependent timing.