Renesas 72215LB10PFG

Overview

IDT72215LB10PFG from Integrated Device Technology is a 512 × 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 features programmable Almost-Empty/Almost-Full flags, Half-Full flag, and depth/width expandability-used in LAN controllers, optical disk interfaces, and interprocessor data buffering where deterministic latency and clock domain bridging are critical.

For engineers reviewing the IDT72215LB10PFG datasheet, IDT72215LB10PFG pinout, IDT72215LB10PFG application, or IDT72215LB10PFG equivalent, key selection considerations include its 512-word depth, 18-bit bus width, asynchronous dual-clock support, TQFP-64 package, and programmable flag offsets for custom buffer threshold control.

Technical Context

This FIFO implements a dual-port zero fall-through time architecture with independent read/write pointers, enabling concurrent access without metastability risk. Its flag logic synchronizes EF to RCLK and FF to WCLK, while PAE/PAF operate asynchronously with configurable offsets loaded via LD/WEN/RCLK sequences.

The device supports single-clock (RCLK = WCLK) or fully asynchronous dual-clock modes, with expansion via WXI/WXO and RXI/RXO pins for daisy-chained depth scaling. Reset initializes pointers, flags, and offset registers to factory defaults-required before first write after power-up.

Key Specifications

Pinout & Package

Package: 64-lead thin quad flatpack (TQFP), PN64-1 footprint, lead finish SnPb (end-of-life as of June 15, 2018).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NB3N502DG, IDT72215LB10PFG offers 16× greater depth and 5 V compatibility; versus Renesas 72V2115L10PF, it shares identical functionality but has higher active current and end-of-life SnPb packaging-making the Renesas part the recommended upgrade path.

Availability

IDT72215LB10PFG is available at Aetrix Electronics and suitable for LAN controllers, optical storage interfaces, interprocessor communication links, and industrial PLC I/O modules requiring stable component supply and long-term obsolescence management.

Supply support for IDT72215LB10PFG 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, specialized in high-performance timing, memory interface, and RF solutions for communications and computing markets.

IDT72215LB10PFG belongs to the SyncFIFO™ family-designed specifically for deterministic, low-latency data buffering across asynchronous clock domains in networking, storage, and industrial control systems.

FAQ

What is the memory organization of the IDT72215LB10PFG?

The IDT72215LB10PFG implements a 512 × 18-bit synchronous FIFO memory array-storing 512 words of 18-bit parallel data. This configuration supports applications requiring moderate-depth buffering with wide data paths, such as packetized network traffic or multi-channel sensor data aggregation. The IDT72215LB10PFG uses a dual-port architecture with independent read and write pointers to ensure zero fall-through time and deterministic latency.

Does the IDT72215LB10PFG support both single-clock and dual-clock operation?

Yes, the IDT72215LB10PFG supports both configurations: RCLK and WCLK can be tied together for single-clock operation, or run independently for true asynchronous dual-clock bridging. In dual-clock mode, EF is synchronized to RCLK and FF to WCLK-ensuring reliable flag assertion regardless of clock phase relationship. The IDT72215LB10PFG's design tolerates clock skew per tSKEW1/tSKEW2 specifications to prevent metastability.

What are the default programmable flag offsets for the IDT72215LB10PFG?

The IDT72215LB10PFG defaults to 63-word offsets for both PAE (Almost-Empty) and PAF (Almost-Full) flags after reset-meaning PAE asserts when 63 words remain before empty, and PAF asserts when 63 words remain before full. These values are stored in dedicated 12-bit offset registers and can be reprogrammed using the LD/WEN sequence. The IDT72215LB10PFG's datasheet confirms these defaults apply specifically to the 512-word variant, distinguishing it from smaller (256-word) or larger (1024+ word) family members.

Is the IDT72215LB10PFG still in production, and what is its packaging status?

The IDT72215LB10PFG was manufactured in SnPb (lead-based) finish and entered end-of-life (EOL) with last-time-buy expiring June 15, 2018. It remains available through authorized distributors and Aetrix Electronics' legacy inventory with full traceability. The IDT72215LB10PFG uses a 64-pin TQFP (PN64-1) package-compatible with standard reflow profiles despite its Pb-free exemption status. No RoHS-compliant revision was released under this exact part number.

How does the Half-Full (HF) flag function on the IDT72215LB10PFG?

On the IDT72215LB10PFG, the WXO pin serves dual purpose: in single-device mode, it functions as the Half-Full flag, going LOW when exactly 256 words (half of 512) are stored. HF remains asserted until the word count drops to ≤255, then resets HIGH on the next RCLK rising edge. This asynchronous flag enables efficient polling or interrupt-driven buffer management without requiring continuous EF/FF monitoring. The IDT72215LB10PFG's HF behavior is fixed-not programmable-and operates independently of PAE/PAF settings.