Renesas 72V245L10PFG8

Overview

72V245L10PFG8 from Integrated Device Technology is a 4,096 × 18-bit synchronous FIFO memory IC operating at 3.3 V with 10 ns read/write cycle time, 5 V input tolerance, and industrial temperature range (–40°C to +85°C). It supports dual-clock asynchronous operation, programmable Almost-Empty/Almost-Full flags, and First Word Fall-Through timing mode for real-time data buffering in high-speed interconnects.

For engineers reviewing the 72V245L10PFG8 datasheet, 72V245L10PFG8 pinout, 72V245L10PFG8 application, or 72V245L10PFG8 equivalent, key selection criteria include its 4,096-word depth, 18-bit bus width, TQFP-64 package, dual-clock flag timing flexibility, and support for daisy-chain depth expansion in optical disk controllers and LAN interface designs.

Technical Context

This device implements a clocked, dual-port RAM array with independent read/write pointers, offset-programmable status flags (PAE/PAF), and configurable register-buffering (single/double/triple) for EF/FF/IR/OR signals. Its architecture enables deterministic latency control via IDT Standard or FWFT timing modes selected at reset using FL/RXI/WXI pins.

Flag behavior differs fundamentally between modes: in FWFT, OR goes LOW after first write and remains active until last word is read, while IR asserts HIGH only when full - enabling immediate data availability without REN assertion. Asynchronous vs synchronous flag timing is also selectable per Table 3, affecting PAE/PAF assertion edges relative to RCLK/WCLK.

Key Specifications

Pinout & Package

64-pin thin quad flatpack (TQFP) with exposed thermal pad; 7 GND pins distributed for noise suppression, 3 VCC pins for power integrity, and dedicated expansion I/O (WXI/WXO/RXI/RXO) for depth scalability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 72V245L10PFG8, the L15 and L20 variants trade raw speed for reduced power and cost - the L10 remains optimal for 100 MHz clock domains requiring minimal latency in optical storage and high-end networking equipment.

Availability

72V245L10PFG8 is available at Aetrix Electronics and suitable for optical disk controllers, industrial Ethernet switches, multi-processor communication links, and real-time motion control gateways requiring stable component supply across extended product lifecycles.

Supply support for 72V245L10PFG8 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, memory interface, RF, and sensor solutions for communications, computing, and industrial markets.

The IDT72V2xx5 family was designed specifically for high-reliability, low-latency data buffering in cross-clock-domain applications - emphasizing deterministic flag timing, expandability, and industrial-grade robustness.

FAQ

What is the maximum clock frequency supported by the 72V245L10PFG8?

The 72V245L10PFG8 supports a maximum clock frequency of 100 MHz, derived from its 10 ns read/write cycle time specification. This applies to both WCLK and RCLK when operated independently or coincidentally. The device maintains timing compliance across the full industrial temperature range (–40°C to +85°C) and 3.3 V ± 0.3 V supply, with AC characteristics verified under load conditions matching Figure 1 (30 pF, 330 Ω termination).

How does First Word Fall-Through (FWFT) mode differ from IDT Standard mode in the 72V245L10PFG8?

In FWFT mode, the first word written to an empty 72V245L10PFG8 appears on Q0–Q17 after three RCLK transitions without requiring REN assertion - reducing initial access latency. In IDT Standard mode, REN must be asserted and a rising RCLK edge applied to shift the first word to outputs. Mode selection occurs at reset via FL/RXI/WXI pin states per Table 3, and affects EF/OR, FF/IR, and PAE/PAF flag definitions.

Can the 72V245L10PFG8 be used in depth-expanded configurations, and how is it implemented?

Yes, the 72V245L10PFG8 supports depth expansion via daisy-chain configuration using WXO/WXI and RXO/RXI pins. In this setup, FL is grounded on the first device and pulled HIGH on subsequent devices. WXO of each device drives WXI of the next, and RXO drives RXI - propagating write/read completion pulses across the chain. This preserves 18-bit width while scaling total depth linearly (e.g., two devices yield 8,192 × 18-bit capacity), with no external logic required.

What are the default programmable flag offset values for the 72V245L10PFG8, and how are they loaded?

The 72V245L10PFG8 defaults to 127-word offsets for both PAE (almost-empty) and PAF (almost-full) flags. These values are loaded into internal registers via D0–D11 during LOW-to-HIGH WCLK transitions while LD and WEN are held LOW - first transition writes empty offset, second writes full offset. Default values are applied automatically at power-on reset, and user-defined values persist until reloaded or reset.

Does the 72V245L10PFG8 support 5 V logic interfacing, and what are the voltage limits?

Yes, the 72V245L10PFG8 features 5 V tolerant inputs: all control and data pins (D0–D17, WCLK, RCLK, WEN, REN, OE, RS, LD, FL, WXI, RXI) accept VIH up to 5.5 V and VIL down to –0.5 V, per DC Electrical Characteristics table. This allows direct connection to 5 V CMOS/TTL logic without level shifters, while the core operates at 3.3 V - simplifying mixed-voltage system integration.