Renesas 72V205L15TFGI

Overview

IDT72V205L15TFGI from Integrated Device Technology (IDT) is a 3.3 V, 256 × 18-bit synchronous FIFO memory IC with dual-clock operation, 10 ns read/write cycle time, and industrial temperature range (–40°C to +85°C). It supports IDT Standard and First Word Fall-Through (FWFT) timing modes, features programmable Almost-Empty/Almost-Full flags, and is used in optical disk controllers, LAN interfaces, and interprocessor communication buffers.

For engineers reviewing the IDT72V205L15TFGI datasheet, IDT72V205L15TFGI pinout, IDT72V205L15TFGI application, or IDT72V205L15TFGI equivalent, key selection criteria include its 15 ns speed grade, TQFP-64 package, 5 V input tolerance, register-buffered flag options, and configurable asynchronous/synchronous flag timing - all critical for deterministic data buffering in mixed-voltage, multi-clock systems.

Technical Context

This FIFO implements a high-speed submicron CMOS architecture with independent read and write clock domains (RCLK/WCLK), enabling true asynchronous data transfer between clock domains. Its internal pointer logic supports depth expansion via daisy-chained WXO/RXO signals and width expansion using parallel configurations.

The device provides two fixed status flags (EF/OR and FF/IR), two user-programmable offset-based flags (PAE and PAF), and a Half-Full (HF) flag. Flag behavior and timing (synchronous vs. asynchronous assertion) are determined at reset via FL/RXI/WXI pin states per Table 3, and register-buffering depth (single/double/triple) is configured simultaneously.

Key Specifications

Pinout & Package

Package: 64-lead STQFP (Thin Quad Flatpack), 10 mm × 10 mm body, 0.5 mm lead pitch, RoHS-compliant green variant available (per ordering info).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 72V205L15PFI and 72V205L10TFGI, IDT72V205L15TFGI delivers optimal balance of industrial reliability, compact STQFP packaging, and 66.7 MHz performance - making it the preferred choice for space-constrained, thermally demanding embedded systems where 15 ns timing suffices.

Availability

IDT72V205L15TFGI is available at Aetrix Electronics and suitable for optical disk controllers, industrial Ethernet switches, multi-processor communication links, and real-time motion control systems requiring stable component supply across extended product lifecycles.

Supply support for IDT72V205L15TFGI 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 communications systems.

IDT72V205L15TFGI belongs to the SyncFIFO™ family - designed specifically for deterministic, low-latency data buffering in multi-clock domain systems such as networking equipment, storage controllers, and industrial automation platforms.

FAQ

What is the maximum clock frequency supported by IDT72V205L15TFGI?

IDT72V205L15TFGI supports a maximum clock frequency of 66.7 MHz, derived from its 15 ns cycle time specification. This applies to both WCLK and RCLK independently, enabling dual-clock operation at full speed. The device meets all AC timing parameters (tCLK, tDS, tDH, etc.) at this frequency under industrial conditions (VCC = 3.3 V ±0.3 V, TA = –40°C to +85°C), as verified in the AC Electrical Characteristics table on page 5 of the datasheet.

Does IDT72V205L15TFGI support 5 V logic inputs?

Yes, IDT72V205L15TFGI features 5 V input tolerance on all control and data pins (D0–D17, WCLK, RCLK, WEN, REN, OE, RS, LD, FL, WXI, RXI). This allows direct interfacing with 5 V microcontrollers, FPGAs, or legacy peripherals without external level shifters, while operating from a 3.3 V supply - a key advantage for mixed-voltage system integration.

How is the First Word Fall-Through (FWFT) mode enabled on IDT72V205L15TFGI?

FWFT mode is configured during hardware reset (RS low) by setting specific logic levels on FL, RXI, and WXI pins per Table 3. For example, FL = LOW, RXI = LOW, WXI = HIGH selects FWFT mode with triple-buffered OR and double-buffered IR flags and asynchronous PAE/PAF timing. The configuration is latched at reset release and remains active until next reset.

Can the Almost-Empty and Almost-Full flag thresholds be customized on IDT72V205L15TFGI?

Yes, IDT72V205L15TFGI allows user programming of PAE and PAF offset values via the LD pin and D0–D11 inputs. With LD and WEN held LOW, successive WCLK rising edges load empty offset (first edge) and full offset (second edge) into internal registers. Default offsets are 31 words from empty/full for IDT72V205, but custom values can be set to match application-specific buffer management policies.

What is the purpose of the Half-Full (HF) flag on IDT72V205L15TFGI?

The HF flag on IDT72V205L15TFGI asserts LOW when exactly 129 words are stored (for 256-word depth), providing an early warning of buffer occupancy midpoint. In FWFT mode, it triggers at 130 words. This enables proactive flow control - e.g., initiating DMA prefetch or throttling upstream data rate - well before EF or FF transitions, improving system responsiveness and preventing overflow/underflow in real-time pipelines.