Renesas 72V205L15TFGI8

Overview

72V205L15TFGI8 from Integrated Device Technology (IDT) is a 3.3 V CMOS synchronous FIFO memory with 256 × 18-bit depth-width organization, 15 ns clock cycle time, and industrial temperature range (–40°C to +85°C). It supports dual-clock (asynchronous read/write) or single-clock operation, features programmable Almost-Empty/Almost-Full flags, and is used in optical disk controllers, LAN interfaces, and interprocessor data buffering.

For engineers reviewing the 72V205L15TFGI8 datasheet, 72V205L15TFGI8 pinout, 72V205L15TFGI8 application, or 72V205L15TFGI8 equivalent, this page delivers verified timing modes (IDT Standard/FWFT), flag behavior under reset, register-buffered flag options, DC/AC electrical specs, and TQFP-64 package implementation details - all confirmed for the exact speed grade and temperature variant.

Technical Context

The 72V205L15TFGI8 implements a high-speed submicron CMOS SyncFIFO architecture with independent read/write pointer control, offset-programmable PAE/PAF flags, and configurable flag buffering (single/double/triple register) selected at reset via FL/RXI/WXI pins. Its 18-bit bidirectional data path operates with 5 V-tolerant inputs and 3.3 V supply.

It supports two distinct timing modes: IDT Standard mode (EF/FF flags, read-triggered output) and First Word Fall-Through (FWFT) mode (OR/IR flags, immediate first-word output after three RCLK edges). Flag timing (synchronous vs asynchronous) and buffer depth are determined during power-on reset configuration and cannot be changed dynamically.

Key Specifications

Pinout & Package

72V205L15TFGI8 is housed in a 64-lead thin quad flatpack (TQFP) package (order code TF), with seven ground pins distributed for noise suppression and signal integrity in high-speed clock domains.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 72V205L15TFG, the 72V205L15TFGI8 adds industrial temperature qualification without altering functionality; compared with 72V205L10TFGI8, it trades 15 ns timing margin for lower power and relaxed layout constraints - enabling cost-effective robustness in factory-floor applications.

Availability

72V205L15TFGI8 is available at Aetrix Electronics and suitable for optical disk controllers, industrial Ethernet switches, interprocessor communication links, and real-time motion control systems requiring stable component supply across extended product lifecycles.

Supply support for 72V205L15TFGI8 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, acquired by Renesas Electronics in 2019.

The IDT72V2xx family was designed specifically for high-reliability, low-latency data buffering in industrial and communications infrastructure - emphasizing configurability (timing mode, flag behavior), robustness (5 V tolerance, wide temp), and seamless expandability.

FAQ

What is the default timing mode for 72V205L15TFGI8 after power-on reset?

The default timing mode for 72V205L15TFGI8 is IDT Standard mode, activated when FL=0, RXI=0, and WXI=0 at reset (per Table 3). In this mode, the Empty Flag (EF) and Full Flag (FF) are active, and the first written word does not appear on Q0–Q17 until a read operation (REN + RCLK) is executed. The device remains in this mode unless reconfigured via the FL/RXI/WXI pin states during subsequent resets.

Can 72V205L15TFGI8 operate with only one clock signal?

Yes, 72V205L15TFGI8 supports single-clock operation: tie WCLK and RCLK together and use WEN/REN independently to control write/read timing. This configuration maintains full functionality - including EF/FF flag generation, PAE/PAF assertion, and HF indication - while simplifying clock tree design in systems with a unified timing domain.

How is the Half-Full (HF) flag asserted in 72V205L15TFGI8?

In 72V205L15TFGI8, the Half-Full (HF) flag goes LOW when exactly 129 words are stored (for IDT Standard mode) or 130 words (for FWFT mode), corresponding to >50% utilization of its 256-word depth. HF is internally generated and requires no external configuration; it functions identically across both timing modes and is unaffected by PAE/PAF offset programming.

What happens to the output bus when OE is HIGH on 72V205L15TFGI8?

When OE is HIGH on 72V205L15TFGI8, the Q0–Q17 data output bus enters a high-impedance (Hi-Z) state, electrically disconnecting it from the load. This allows multiple devices to share the same data bus without contention. Output data remains valid until OE transitions HIGH, and tOHZ (≤10 ns) defines the maximum delay to Hi-Z state after OE rises.

Is 72V205L15TFGI8 pin-compatible with other members of the IDT72V2xx family?

No, 72V205L15TFGI8 is not pin-compatible with IDT72V215/225/235/245 variants. While all share the same 64-pin TQFP package and core signal naming (WCLK, REN, Q0–Q17, etc.), the internal memory depth differs (256 vs 512/1024/2048/4096), resulting in different flag assertion thresholds and timing behaviors - requiring board-level redesign for substitution.