Renesas 72V205L10TFG8

Overview

IDT72V205L10TFG8 from Integrated Device Technology (IDT) is a 3.3 V CMOS synchronous FIFO memory with 256 × 18-bit depth and width, supporting dual-clock or single-clock operation, 10 ns read/write cycle time, 5 V input tolerance, and industrial temperature range (–40°C to +85°C). It serves as a high-speed data buffer in optical disk controllers, LAN interfaces, and interprocessor communication links.

For engineers reviewing the IDT72V205L10TFG8 datasheet, IDT72V205L10TFG8 pinout, IDT72V205L10TFG8 application, or IDT72V205L10TFG8 equivalent, key selection criteria include its FWFT/Standard timing mode configurability, programmable almost-empty/almost-full flag offsets, register-buffered flag options, and TQFP-64 packaging with 18-bit bidirectional data path.

Technical Context

This FIFO implements a clocked, dual-port RAM array with independent read and write pointer logic, configurable flag timing (synchronous/asynchronous), and selectable register buffering (single/double/triple) for EF/FF flags. It supports both IDT Standard and First Word Fall-Through (FWFT) modes determined at reset via FL/RXI/WXI pins.

Flag behavior differs fundamentally between modes: in Standard mode, EF/FF reflect true empty/full states with no output until REN activation; in FWFT mode, OR/IR provide immediate output readiness and input availability, enabling zero-latency first-word access after three RCLK edges.

Key Specifications

Pinout & Package

Package: 64-lead thin quad flatpack (TQFP), 10 mm × 10 mm, 0.5 mm pitch, lead finish SnPb (EOL as of June 2018; green Pb-free version available).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NB3N502DG and 72V205L10PF, the IDT72V205L10TFG8 uniquely combines FWFT operation, user-programmable flag offsets, and daisy-chain expandability in a space-efficient TQFP package-making it optimal for latency-critical, field-upgradable, or multi-depth buffering designs.

Availability

IDT72V205L10TFG8 is available at Aetrix Electronics and suitable for optical disk controllers, LAN MAC interfaces, interprocessor communication links, and real-time industrial data acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for IDT72V205L10TFG8 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and serial switching solutions before its acquisition by Renesas Electronics in 2019.

The IDT72V205L10TFG8 belongs to IDT's SyncFIFO™ family-designed specifically for high-reliability, low-latency data buffering in communications infrastructure, storage subsystems, and industrial automation where deterministic timing and robust flag signaling are critical.

FAQ

What is the function of the FL, RXI, and WXI pins on the IDT72V205L10TFG8?

The FL, RXI, and WXI pins configure the IDT72V205L10TFG8 at reset into one of eight operational modes defined in Table 3. They determine timing mode (IDT Standard or FWFT), flag buffering depth (single/double/triple), and PAE/PAF synchronization (asynchronous/synchronous). These pins must be held static during RS assertion and remain stable for tRSS (≥8 ns) before reset release.

Does the IDT72V205L10TFG8 support depth expansion, and how is it implemented?

Yes, the IDT72V205L10TFG8 supports daisy-chain depth expansion using WXO, RXO, and FL pins. In a chain, FL is grounded on the first device and pulled HIGH on subsequent devices; WXI connects to the prior device's WXO, and RXI to its RXO. This enables seamless stacking of multiple IDT72V205L10TFG8 units to achieve larger effective depths without external control logic.

What is the default offset value for the PAE and PAF flags in the IDT72V205L10TFG8?

The IDT72V205L10TFG8 defaults to 31 words from empty for PAE and 31 words from full for PAF after reset. These values are stored in internal offset registers and can be reprogrammed via D0–D11 and the LD/WCLK sequence. Offset loading is only supported in IDT Standard mode-not in FWFT mode.

Can the IDT72V205L10TFG8 operate with asynchronous read and write clocks?

Yes, the IDT72V205L10TFG8 fully supports asynchronous RCLK and WCLK operation. Its internal pointer logic is designed to handle clock domain crossing safely. Skew timing requirements (tSKEW1 ≥5 ns for EF/FF, tSKEW2 ≥14 ns for PAE/PAF) ensure reliable flag assertion across unrelated clock edges without metastability-induced glitches.

Is the IDT72V205L10TFG8 pin-compatible with other members of the IDT72V2xx5 family?

No-the IDT72V205L10TFG8 is not pin-compatible with IDT72V215L10TFG8 or higher-density variants. While all share the same 64-pin TQFP package and signal naming convention, the internal memory depth (256 vs. 512/1024/etc.) changes flag timing behavior and default offset values, and datasheet does not guarantee mechanical or electrical interchangeability without design validation.