Renesas 72225LB10PFG

Overview

IDT72225LB10PFG from Integrated Device Technology is a 1,024 × 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), used for buffering high-speed data streams in optical disk controllers and LAN interfaces.

For engineers reviewing the IDT72225LB10PFG datasheet, IDT72225LB10PFG pinout, IDT72225LB10PFG application, or IDT72225LB10PFG equivalent, key selection criteria include programmable almost-empty/almost-full flags, half-full flag capability, depth/width expandability via daisy-chain, and TQFP-64 packaging with 5 V supply compatibility.

Technical Context

This device implements a dual-port zero fall-through time architecture with independent read and write pointer logic, enabling true asynchronous clock domain crossing between WCLK and RCLK. It supports both single-clock (coincident clocks) and dual-clock (asynchronous clocks) modes with skew timing constraints (tSKEW1/tSKEW2 ≥ 5 ns).

The FIFO integrates offset register programming via LD/WEN/RCLK control for PAE/PAF thresholds, plus expansion logic for depth scaling using WXI/WXO and RXI/RXO pins. Flag outputs (EF, FF, PAE, PAF, HF) are synchronized to respective clocks, with HF operating as a dual-purpose output in single-device mode.

Key Specifications

Pinout & Package

Package: 64-lead thin quad flatpack (TQFP), lead finish SnPb (EOL process, last time buy expired June 15, 2018).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72225LB10PFG, 72225L10TF offers identical performance in a RoHS-compliant package, while 72225LA10PFG sacrifices industrial temperature rating for lower cost-neither is pin-compatible replacement without verifying thermal and compliance requirements.

Availability

IDT72225LB10PFG is available at Aetrix Electronics and suitable for optical storage subsystems, industrial Ethernet gateways, interprocessor communication links, and motion control interfaces requiring stable component supply across extended lifecycle windows.

Supply support for IDT72225LB10PFG 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, designs high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.

IDT72225LB10PFG belongs to the SyncFIFO™ family of high-speed CMOS FIFO memories engineered for deterministic data buffering in multi-clock-domain systems such as networking, storage, and real-time control.

FAQ

What is the memory organization of the IDT72225LB10PFG?

The IDT72225LB10PFG implements a 1,024 × 18-bit synchronous FIFO array, delivering 18,432 bits of buffer capacity. This configuration supports 18-bit parallel data paths commonly used in legacy industrial buses and optical storage interfaces. The IDT72225LB10PFG uses a dual-port architecture with independent read and write pointers to enable concurrent access without contention.

Does the IDT72225LB10PFG support asynchronous clock domains?

Yes, the IDT72225LB10PFG supports fully asynchronous operation between its WCLK and RCLK inputs, with verified skew timing margins (tSKEW1/tSKEW2 ≥ 5 ns). This allows safe data transfer between unrelated clock domains-for example, bridging a 66 MHz PCI bus to a 25 MHz video encoder clock-without external synchronization logic. The IDT72225LB10PFG flags (EF, FF, PAE, PAF) remain valid under these conditions.

What are the default programmable flag offsets for the IDT72225LB10PFG?

The IDT72225LB10PFG defaults to 127-word offsets for both PAE (programmable almost-empty) and PAF (programmable almost-full) flags after reset. This corresponds to ~12.5% of its 1,024-word depth, enabling early flow-control signaling before buffer saturation or depletion. These values can be reprogrammed via the LD/WEN interface using D0–D11 inputs.

Can multiple IDT72225LB10PFG devices be cascaded for larger buffer depth?

Yes, the IDT72225LB10PFG supports daisy-chain depth expansion using WXO→WXI and RXO→RXI connections. In this configuration, FL is grounded on the first device and driven HIGH on all others. Each device contributes its full 1,024-word depth, enabling scalable buffers-for example, four devices yield 4,096 × 18-bit capacity. The IDT72225LB10PFG expansion logic handles pointer coordination automatically.

Is the IDT72225LB10PFG still in active production?

The IDT72225LB10PFG entered End-of-Life (EOL) for SnPb lead finish per the November 2017 datasheet, with last-time-buy expiring June 15, 2018. However, Aetrix Electronics maintains traceable inventory of original-IDT manufactured units with full documentation and industrial temperature qualification. No newer revision or drop-in replacement has been released by Renesas to supersede this specific variant.