Renesas 72V235L15TFGI8

Overview

72V235L15TFGI8 from Integrated Device Technology (IDT) is a 3.3 V CMOS synchronous FIFO memory with 2,048 × 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 interprocessor communication and LAN controller interfaces.

For engineers reviewing the 72V235L15TFGI8 datasheet, 72V235L15TFGI8 pinout, 72V235L15TFGI8 application, or 72V235L15TFGI8 equivalent, key selection criteria include its 2,048-word depth, programmable almost-empty/empty flags, FWFT vs. IDT Standard timing mode configuration, and TQFP-64 package compatibility with daisy-chain depth expansion.

Technical Context

The 72V235L15TFGI8 implements a clocked, dual-port RAM array with independent read and write pointers, configurable flag timing (synchronous/asynchronous), and register-buffered EF/FF outputs selectable via FL/RXI/WXI at reset. Its architecture supports both IDT Standard and First Word Fall-Through (FWFT) modes, with distinct flag behavior and output readiness logic per mode.

Flag offset programming is performed via D0–D11 during LD/WEN assertion, enabling user-defined PAE/PAF thresholds. The device features three-state output enable (OE), 5 V tolerant inputs, and half-full (HF) flag capability - all implemented in high-performance submicron CMOS for low power consumption at 3.3 V supply.

Key Specifications

Pinout & Package

72V235L15TFGI8 is housed in a 64-lead thin quad flatpack (TQFP) package with 0.5 mm lead pitch, compliant with JEDEC MO-153, and rated for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 72V235L15PFI and 72V233L15TFGI8, the 72V235L15TFGI8 uniquely delivers full 2K-word depth in the thermally optimized TQFP package while maintaining pin- and function-compatibility with the broader IDT72V2xx5 family - making it the preferred choice for new industrial designs requiring margin against peak data rates.

Availability

72V235L15TFGI8 is available at Aetrix Electronics and suitable for industrial Ethernet switches, optical storage controllers, multi-processor communication links, and legacy bus bridge designs requiring stable component supply and long-term lifecycle support.

Supply support for 72V235L15TFGI8 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, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs for communications and industrial markets.

The IDT72V2xx5 SyncFIFO™ product line was designed specifically for high-reliability, low-latency data buffering in mixed-signal and multi-clock domain systems - targeting applications where deterministic timing and robust flag signaling are critical.

FAQ

What is the memory organization of the 72V235L15TFGI8?

The 72V235L15TFGI8 features a 2,048 × 18-bit synchronous FIFO memory array, meaning it stores up to 2,048 words, each 18 bits wide. This organization supports high-bandwidth data buffering in applications like network controllers and interprocessor links, where wide parallel data paths reduce transaction overhead. The 72V235L15TFGI8 maintains this exact configuration across all operating modes and temperature ranges specified in its datasheet.

Does the 72V235L15TFGI8 support both single-clock and dual-clock operation?

Yes, the 72V235L15TFGI8 supports both configurations: RCLK and WCLK can be tied together for single-clock operation, or driven independently for true asynchronous dual-clock use. In dual-clock mode, the device handles clock domain crossing with built-in synchronization for EF/FF flags when configured for double/triple buffering. The 72V235L15TFGI8 requires no external logic to manage metastability in either mode.

How is the First Word Fall-Through (FWFT) mode enabled on the 72V235L15TFGI8?

FWFT mode is selected during power-on reset by asserting specific logic levels on FL, RXI, and WXI pins per Table 3 in the datasheet - for example, FL = 0, RXI = 0, WXI = 1 configures FWFT with triple-buffered OR and double-buffered IR. This configuration is latched at reset and remains active until next reset. The 72V235L15TFGI8 does not support runtime switching between FWFT and IDT Standard modes.

What are the default programmable flag offsets for the 72V235L15TFGI8?

The 72V235L15TFGI8 defaults to 127-word offsets for both PAE (almost-empty) and PAF (almost-full) flags - consistent with its 2,048-word depth. These values are loaded into internal offset registers at reset and can be reprogrammed via D0–D11 during LD/WEN assertion. The 72V235L15TFGI8 retains these defaults unless explicitly overwritten, ensuring predictable flow-control behavior out-of-box.

Is the 72V235L15TFGI8 pin-compatible with other members of the IDT72V2xx5 family?

Yes, the 72V235L15TFGI8 shares identical pinout, package (TQFP-64), and signal definitions with IDT72V205/215/225/245 variants - differing only in memory depth. This enables drop-in replacement in depth-flexible designs and simplifies BOM consolidation. All timing parameters, flag behaviors, and configuration methods remain consistent across the family, including the 72V235L15TFGI8.