Renesas 72V225L10TFG

Overview

72V225L10TFG from Integrated Device Technology (IDT) is a 3.3 V CMOS synchronous FIFO memory with 1,024 × 18-bit depth-width configuration, 10 ns read/write cycle time, and dual-clock asynchronous operation capability. It supports IDT Standard and First Word Fall-Through (FWFT) timing modes, features programmable Almost-Empty/Almost-Full flags, and operates across industrial temperature range (–40°C to +85°C). It is used in optical disk controllers, LAN interfaces, and interprocessor communication buffers.

For engineers reviewing the 72V225L10TFG datasheet, 72V225L10TFG pinout, 72V225L10TFG application, or 72V225L10TFG equivalent, key selection criteria include its 1,024-word × 18-bit capacity, 10 ns access timing, configurable flag synchronization mode, and TQFP-64 package compatibility with depth/width expansion via WXI/WXO/RXI/RXO pins.

Technical Context

The 72V225L10TFG implements a clocked, dual-port FIFO architecture with independent write (WCLK/WEN) and read (RCLK/REN) control paths, enabling true asynchronous data buffering between mismatched clock domains. Its internal RAM array is paired with input/output registers, offset logic, and configurable flag generation circuitry supporting both synchronous and asynchronous flag timing modes.

Flag behavior is determined at reset via FL/RXI/WXI pin states, selecting between IDT Standard and FWFT modes - which define whether EF/OR or FF/IR are active, how PAE/PAF respond to clock edges, and whether HF is available. The device also supports single/double register-buffered flag outputs to mitigate metastability during boundary transitions.

Key Specifications

Pinout & Package

72V225L10TFG is housed in a 64-lead thin quad flatpack (STQFP, order code TF), with seven ground pins distributed for noise suppression and signal integrity. Pin assignments follow JEDEC-standard TQFP layout with dedicated data, clock, control, and flag I/O groups.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 72V225L15TFG and 72V223L10TFG, the 72V225L10TFG delivers maximum throughput (100 MHz) and deepest standard buffer (1,024 × 18) in the STQFP-64 footprint - making it optimal for high-bandwidth, latency-sensitive interconnects where capacity and speed cannot be traded.

Availability

72V225L10TFG is available at Aetrix Electronics and suitable for optical disk controllers, industrial Ethernet switches, multi-processor communication links, and rack-mounted data acquisition systems requiring stable component supply and long-term industrial temperature support.

Supply support for 72V225L10TFG 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) is a fabless semiconductor company specializing in timing, interface, and memory solutions, acquired by Renesas Electronics in 2019. IDT pioneered high-speed FIFO architectures for data-intensive systems.

The IDT72V2xx family was designed specifically for low-power, high-speed synchronous buffering in industrial and communications equipment - emphasizing configurability, clock domain isolation, and robust flag signaling for real-time flow control.

FAQ

What is the memory organization of the 72V225L10TFG?

The 72V225L10TFG implements a 1,024 × 18-bit synchronous FIFO memory array, providing 18,432 bits of buffer storage. This configuration supports 18-bit parallel data paths and is optimized for applications requiring moderate-depth, high-speed buffering such as network packet handling and interprocessor messaging. The 72V225L10TFG does not support width expansion beyond 18 bits without external logic.

Does the 72V225L10TFG support both synchronous and asynchronous clock domains?

Yes, the 72V225L10TFG supports fully asynchronous operation between its write clock (WCLK) and read clock (RCLK), allowing independent frequencies and phase relationships. It also supports coincident (single-clock) operation when WCLK and RCLK are tied together. This dual-clock capability makes the 72V225L10TFG suitable for bridging mismatched timing domains in FPGA-to-ASIC or processor-to-peripheral interfaces.

How is the First Word Fall-Through (FWFT) mode enabled on the 72V225L10TFG?

FWFT mode is configured during hardware reset (RS low) by setting specific logic levels on the FL, RXI, and WXI pins per Table 3 in the datasheet - for example, FL = 0, RXI = 0, WXI = 1 selects FWFT with triple/double register-buffered OR/IR flags and asynchronous PAE/PAF timing. Once configured, FWFT mode causes the first written word to appear on Q0–Q17 after three RCLK edges, eliminating initial read latency. The 72V225L10TFG retains this mode until next reset.

Can the Almost-Empty and Almost-Full flag thresholds be customized on the 72V225L10TFG?

Yes, the 72V225L10TFG allows user-programmable offsets for both PAE and PAF flags using the LD pin and D0–D11 inputs. With LD and WEN held low, successive WCLK edges load empty offset (first edge) and full offset (second edge) values. Default offsets are 127 words from empty/full; custom values enable precise flow-control watermarking. The 72V225L10TFG supports reading back these values via Q0–Q11 when LD and REN are low.

What is the operating temperature range certified for the 72V225L10TFG?

The 72V225L10TFG is rated for industrial temperature operation from –40°C to +85°C, verified per manufacturer specifications. This range ensures reliable performance in demanding environments such as factory automation controllers, outdoor telecom equipment, and transportation electronics. The 72V225L10TFG is not qualified for extended commercial (0°C to +70°C only) or military-grade ranges.