Renesas 72225LB15PFGI8

Overview

IDT72225LB15PFGI8 from Integrated Device Technology is a 1,024 × 18-bit synchronous FIFO memory IC with dual-clock operation, 10 ns read/write cycle time, programmable Almost-Empty/Almost-Full flags, and Half-Full flag capability - used in optical disk controllers, LAN interfaces, and interprocessor communication buffers.

For engineers reviewing the IDT72225LB15PFGI8 datasheet, IDT72225LB15PFGI8 pinout, IDT72225LB15PFGI8 application, or IDT72225LB15PFGI8 equivalent, key selection criteria include its industrial temperature range (–40°C to +85°C), TQFP-64 package, 5 V supply, 18-bit bidirectional data width, and depth-expandable daisy-chain architecture.

Technical Context

This device implements a dual-port zero fall-through time architecture with independent read/write clocks (RCLK/WCLK), enabling asynchronous or coincident clocking modes. It integrates dedicated input/output registers, offset-controlled programmable flags (PAE/PAF), and expansion logic for depth/width scalability.

The FIFO uses high-performance submicron CMOS technology and supports reset-synchronized initialization of pointers and flags. Its flag logic is clock-domain-specific: FF and PAF are synchronized to WCLK; EF and PAE to RCLK; HF is asynchronous and derived from internal pointer comparison.

Key Specifications

Pinout & Package

Package: 64-lead thin quad flatpack (TQFP), lead finish SnPb (EOL process per Nov 2017 datasheet).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 72225L15TF8 and 72225LB15JGI8, IDT72225LB15PFGI8 offers SnPb lead finish in TQFP-64 - optimal for industrial reworkability and thermal cycling performance, while maintaining full functional equivalence with the green and PLCC variants.

Availability

IDT72225LB15PFGI8 is available at Aetrix Electronics and suitable for optical storage controllers, industrial network gateways, interprocessor communication links, and PLC I/O subsystems requiring stable component supply across extended lifecycle windows.

Supply support for IDT72225LB15PFGI8 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.

IDT72225LB15PFGI8 belongs to the SyncFIFO™ family - designed specifically for high-speed, low-latency data buffering in mixed-clock-domain systems such as communications infrastructure and industrial control.

FAQ

What is the memory organization of the IDT72225LB15PFGI8?

IDT72225LB15PFGI8 features a 1,024 × 18-bit synchronous FIFO memory array, delivering 18,432 bits of buffer capacity. This configuration supports 18-bit parallel data paths and is optimized for applications requiring moderate-depth, high-speed buffering between asynchronous subsystems - such as network controllers and disk drive interfaces.

Does the IDT72225LB15PFGI8 support both single-clock and dual-clock operation?

Yes, IDT72225LB15PFGI8 supports both modes: RCLK and WCLK can be tied together for single-clock operation, or run independently for true dual-clock buffering. The device's dual-port zero fall-through time architecture ensures deterministic latency regardless of clock relationship - a core feature confirmed in the functional block diagram and timing specifications.

What are the default offset values for the programmable flags in IDT72225LB15PFGI8?

IDT72225LB15PFGI8 defaults to PAE and PAF offsets of 127 words after reset - meaning the Almost-Empty flag asserts when 127 locations remain before empty, and Almost-Full asserts when 127 locations remain before full. These values are hard-coded in the offset registers and align with the 1,024-word depth of this variant.

Is the IDT72225LB15PFGI8 suitable for industrial temperature applications?

Yes, IDT72225LB15PFGI8 is rated for the industrial temperature range of –40°C to +85°C, as explicitly stated in the datasheet's "Commercial and Industrial Temperature Ranges" header and DC operating conditions table. This makes it appropriate for deployment in factory automation, transportation, and outdoor telecom equipment.

How does the Half-Full flag (HF) function in IDT72225LB15PFGI8?

In IDT72225LB15PFGI8, the HF pin operates as a Half-Full flag in single-device mode: it goes LOW when exactly 512 words (half of 1,024) are stored, and remains LOW until the word count drops to ≤511. The flag is asynchronous and updated on the next WCLK edge after crossing the threshold - providing a simple hardware signal for balanced buffer management.