Renesas 72V205L10PFG8

Overview

72V205L10PFG8 from Integrated Device Technology (IDT) is a 3.3 V, 256 × 18-bit synchronous FIFO memory IC with dual-clock operation, 10 ns read/write cycle time, 5 V input tolerance, and industrial temperature range (–40°C to +85°C). It supports IDT Standard and First Word Fall-Through (FWFT) timing modes and is used in optical disk controllers, LAN interfaces, and interprocessor data buffering.

For engineers reviewing the 72V205L10PFG8 datasheet, 72V205L10PFG8 pinout, 72V205L10PFG8 application, or 72V205L10PFG8 equivalent, key selection criteria include its 10 ns access time, programmable almost-empty/almost-full flag offsets, register-buffered flag options, and TQFP-64 packaging for high-density PCB layouts.

Technical Context

The 72V205L10PFG8 implements a clocked, dual-port FIFO architecture with independent WCLK and RCLK domains supporting asynchronous or coincident operation. Its internal RAM array (256 × 18 bits) feeds into input and output registers, with configurable flag logic including EF/OR, FF/IR, PAE, PAF, and HF.

Timing mode (IDT Standard vs FWFT) and flag synchronization (asynchronous/synchronous) are determined at reset via FL/RXI/WXI pin states. Flag buffering-single, double, or triple-is also set at reset and affects metastability immunity and flag assertion latency.

Key Specifications

Pinout & Package

72V205L10PFG8 is housed in a 64-lead thin quad flatpack (TQFP), PN64-1 footprint (order code PF), with exposed pad not electrically connected. The package features seven dedicated GND pins distributed across corners and edges to minimize ground bounce and improve signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 72V205L10PFG8, the L15 and L20 variants trade raw speed for reduced power and cost-making them viable alternatives in bandwidth-constrained systems where 10 ns latency is not required for functional correctness or jitter compliance.

Availability

72V205L10PFG8 is available at Aetrix Electronics and suitable for optical disk controllers, industrial LAN interfaces, interprocessor communication links, and real-time data acquisition pipelines requiring stable component supply across extended product lifecycles.

Supply support for 72V205L10PFG8 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.

The IDT72V2xx family delivers low-power, high-speed synchronous FIFOs optimized for clock-domain bridging and burst-mode buffering in embedded systems demanding deterministic latency and industrial reliability.

FAQ

What is the maximum clock frequency supported by the 72V205L10PFG8?

The 72V205L10PFG8 supports a maximum clock frequency of 100 MHz, derived from its 10 ns clock cycle time (tCLK). This applies to both WCLK and RCLK independently, enabling dual-clock operation at full speed. AC electrical characteristics specify tCLKH ≥4.5 ns and tCLKL ≥4.5 ns under commercial/industrial conditions, confirming reliable 100 MHz operation with standard CMOS timing margins. The 72V205L10PFG8 achieves this performance using high-speed submicron CMOS technology while maintaining 3.3 V supply compatibility.

Does the 72V205L10PFG8 support 5 V logic inputs?

Yes, the 72V205L10PFG8 supports 5 V-tolerant inputs across all control and data pins (D0–D17, WCLK, RCLK, WEN, REN, OE, RS, LD, FL, WXI, RXI). VIH is specified from 2.0 V to 5.5 V, allowing direct interfacing with legacy 5 V TTL or CMOS logic without level-shifting circuitry. This capability simplifies integration into mixed-voltage systems and extends compatibility with older peripheral controllers while operating from a 3.3 V supply.

How is the First Word Fall-Through (FWFT) mode enabled on the 72V205L10PFG8?

FWFT mode is configured during power-on reset by asserting specific logic levels on FL, RXI, and WXI pins prior to releasing RS. For the 72V205L10PFG8, FWFT is selected when FL = 0, RXI = 0, WXI = 1 (per Table 3). This configuration also sets triple-buffered OR and double-buffered IR flags with asynchronous timing. The mode remains latched until the next reset event and determines flag behavior (OR/IR instead of EF/FF) and first-word visibility timing.

What are the default programmable flag offset values for the 72V205L10PFG8?

The 72V205L10PFG8 defaults to PAE = 31 words from empty and PAF = 31 words from full after reset. These offsets define the trigger points for the Programmable Almost-Empty and Almost-Full flags in both IDT Standard and FWFT modes. The values are stored in internal offset registers and can be reloaded via the LD pin and D0–D11 during normal operation - enabling runtime adaptation of flow-control thresholds without device replacement.

Is the 72V205L10PFG8 pin-compatible with other members of the IDT72V2xx family?

No - the 72V205L10PFG8 is not pin-compatible with larger-capacity variants (e.g., 72V215, 72V225) despite sharing the same 64-pin TQFP package. While pin assignments for power, clocks, enables, and data buses are consistent, flag and expansion pins (e.g., HF, WXO, RXO) differ in function and electrical behavior across the family. Substituting with a higher-depth variant requires verification of flag logic mapping, timing constraints, and PCB routing - especially for daisy-chain configurations.