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Home > Products > Integrated Circuits (ICs) > Logic > FIFOs Memory

Renesas 72V235L10TFG8

Name: 72V235L10TFG8
Brand: Renesas
SKU: 72V235L10TFG8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 72V235L10TFG8

Manufacturer:: Renesas

Category:: FIFOs Memory

Package:: 64-LQFP

Datasheet:: 72V235L10TFG8.pdf

Description:: IC FIFO SYNC 2KX18 6.5NS 64TQFP

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Product details

Overview

72V235L10TFG8 from Integrated Device Technology (IDT) is a 3.3 V CMOS synchronous FIFO memory with 2,048 × 18-bit depth and width, 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 and is used in LAN controllers, interprocessor communication buffers, and optical disk controller data pipelines.

For engineers reviewing the 72V235L10TFG8 datasheet, 72V235L10TFG8 pinout, 72V235L10TFG8 application, or 72V235L10TFG8 equivalent, key selection criteria include its 2,048-word depth, FWFT/Standard timing mode configurability via FL/RXI/WXI pins, programmable PAE/PAF flag offsets, and TQFP-64 package compatibility with daisy-chain depth expansion.

Technical Context

The 72V235L10TFG8 implements a clocked, dual-port RAM array with independent read (RCLK/REN) and write (WCLK/WEN) control paths, supporting both IDT Standard and First Word Fall-Through (FWFT) timing modes selected at reset via FL/RXI/WXI logic. Its flag architecture includes fixed EF/OR and FF/IR outputs plus programmable PAE, PAF, and HF signals with user-loadable offset registers.

It features single/double register-buffered flag outputs (configurable at reset), asynchronous or synchronous PAE/PAF timing, and expansion logic (WXI/WXO/RXI/RXO) enabling depth scalability. The device uses high-speed submicron CMOS and provides output enable (OE) for three-state bus control.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Depth × Width	2,048 × 18-bit - supports buffering of up to 2,048 words of 18-bit parallel data without external address management.
Read/Write Cycle Time	10 ns - enables 100 MHz clock operation, critical for high-throughput data streaming in LAN and storage interfaces.
Supply Voltage	3.0–3.6 V at 3.3 V nominal - compatible with modern low-voltage digital systems while maintaining 5 V input tolerance on all control/data pins.
Operating Temperature	–40°C to +85°C - qualified for industrial environments including factory automation and embedded networking equipment.
Package	64-pin TQFP (STQFP, order code TF) - surface-mount footprint with 0.5 mm pitch, seven GND pins for noise suppression, and thermal performance suitable for sustained 30 mA active current.
Flag Configuration	Programmable PAE/PAF offsets (default 127 from empty/full) loaded via D0–D11 and LD/WEN - allows precise buffer-level signaling for custom flow-control protocols.
Timing Modes	IDT Standard or FWFT selectable at reset - FWFT delivers first word to Q-bus after three RCLK edges without REN assertion, reducing latency in real-time packet forwarding.

Pinout & Package

64-pin STQFP (thin quad flatpack), 10 mm × 10 mm body, 0.5 mm lead pitch, Pb-free (green) variant available per ordering information. Pin 1 marked by corner cut.

Pin/Terminal	Circuit Role	Design Meaning
D0–D17	Data Input Bus	18-bit parallel input path; accepts 5 V-tolerant logic levels for seamless interfacing with mixed-voltage systems.
Q0–Q17	Data Output Bus	18-bit parallel output with OE-controlled three-state drive; outputs valid within 6 ns of OE assertion in Standard mode.
WCLK / RCLK	Independent Clock Inputs	Asynchronous or coincident clocks; skew between them must be ≥5 ns (tSKEW1) to ensure reliable FF/EF flag generation.
WEN / REN	Enable Controls	Active-low gating: WEN LOW enables write on WCLK rising edge; REN LOW enables read on RCLK rising edge.
OE	Output Enable	Active-low control placing Q0–Q17 in high-impedance state - essential for shared bus architectures.
RS	Hardware Reset	Active-low global reset initializing pointers, flags (FF=HIGH, EF=LOW in Standard mode), and offset registers to defaults.
LD	Offset Load Control	Active-low signal enabling write/read of PAE/PAF offset values via D0–D11 (write) or Q0–Q11 (read, Standard mode only).
FL / WXI / RXI	Mode Configuration	Three-pin truth table (Table 3) selects FWFT/Standard mode, synchronous/asynchronous PAE/PAF, and flag buffering level at power-on reset.
FF/IR / EF/OR / PAE / PAF / WXO/HF / RXO	Status & Expansion Outputs	FF/IR indicates full/input-ready; EF/OR indicates empty/output-ready; PAE/PAF signal near-empty/near-full thresholds; WXO/HF doubles as half-full flag or daisy-chain pulse; RXO pulses on final read for chaining.
VCC / GND	Power Distribution	One 3.3 V supply pin and seven ground pins - distributed grounding minimizes switching noise in high-speed FIFO operation.

Key Features

Feature	Design Value
Configurable Timing Mode	FWFT mode reduces first-word access latency to ≤3 RCLK cycles without REN; Standard mode requires explicit REN+RCLK for initial read - selectable via FL/RXI/WXI at reset.
User-Programmable Flag Offsets	PAE/PAF trigger points adjustable via LD/WEN-controlled loading of D0–D11 into internal offset registers - enables custom buffer watermarking for protocol-specific flow control.
Dual-Clock Asynchronous Operation	RCLK and WCLK may run at different frequencies or phases; tSKEW1 ≥5 ns ensures reliable FF/EF flag generation across clock domains.
Depth Expandability	Daisy-chain capable using WXO→WXI and RXO→RXI; FL grounded on first device, HIGH on subsequent devices - scales total depth beyond 2,048 words without external logic.
Register-Buffered Flags	Single/double/triple buffering (per Table 4/5) eliminates metastability on EF/FF/IR/OR boundaries - trade-off is added clock-cycle delay for flag assertion.

Applications

LAN Controller Buffering	Interprocessor Communication
Use Scenario: Buffering Ethernet frame payloads between MAC and PHY layers in industrial switches with bursty traffic patterns. IC Role / Device Role / Timing Role: Synchronous FIFO decouples mismatched clock domains (e.g., 125 MHz MAC vs. 50 MHz PHY), absorbing jitter and preventing overrun/underrun. Use Value: 2,048 × 18-bit depth accommodates jumbo frames (9,000-byte payload) with margin; 10 ns cycle time sustains line-rate throughput at 1 Gbps.	Use Scenario: Exchanging command/status packets between dual ARM Cortex-M7 cores in a redundant control system. IC Role / Device Role / Timing Role: Dual-clock FIFO isolates core clock domains while enabling deterministic handshaking via EF/FF flags and programmable PAE/PAF for priority interrupt generation. Use Value: FWFT mode delivers first response packet in ≤30 ns (3×10 ns RCLK), accelerating fault detection; industrial temp rating ensures reliability in sealed enclosures.
Optical Disk Controller Interface	Real-Time Data Acquisition Buffer
Use Scenario: Temporarily storing sector-aligned data streams from CD/DVD read heads before ECC processing and host transfer. IC Role / Device Role / Timing Role: High-speed FIFO absorbs mechanical seek latency spikes and bridges variable read rate (e.g., CLV) to fixed USB 2.0 host interface clock. Use Value: 5 V input tolerance allows direct connection to legacy analog front-end ICs; half-full flag (HF) triggers preemptive DMA fetch to minimize buffer underflow.	Use Scenario: Capturing synchronized 16-bit ADC samples from 8-channel sensor array at 1 MSPS for edge AI preprocessing. IC Role / Device Role / Timing Role: Write-side clocked by ADC sampling clock (WCLK), read-side clocked by DSP core (RCLK); PAE flag alerts when <128 words remain to prevent overflow during burst compute. Use Value: Programmable PAE offset (default 127) matches real-time processing latency; TQFP-64 package fits compact PCB layouts with minimal trace length for signal integrity.

LAN Controller Buffering

Interprocessor Communication

Use Scenario: Buffering Ethernet frame payloads between MAC and PHY layers in industrial switches with bursty traffic patterns.

IC Role / Device Role / Timing Role: Synchronous FIFO decouples mismatched clock domains (e.g., 125 MHz MAC vs. 50 MHz PHY), absorbing jitter and preventing overrun/underrun.

Use Value: 2,048 × 18-bit depth accommodates jumbo frames (9,000-byte payload) with margin; 10 ns cycle time sustains line-rate throughput at 1 Gbps.

Use Scenario: Exchanging command/status packets between dual ARM Cortex-M7 cores in a redundant control system.

IC Role / Device Role / Timing Role: Dual-clock FIFO isolates core clock domains while enabling deterministic handshaking via EF/FF flags and programmable PAE/PAF for priority interrupt generation.

Use Value: FWFT mode delivers first response packet in ≤30 ns (3×10 ns RCLK), accelerating fault detection; industrial temp rating ensures reliability in sealed enclosures.

Optical Disk Controller Interface

Real-Time Data Acquisition Buffer

Use Scenario: Temporarily storing sector-aligned data streams from CD/DVD read heads before ECC processing and host transfer.

IC Role / Device Role / Timing Role: High-speed FIFO absorbs mechanical seek latency spikes and bridges variable read rate (e.g., CLV) to fixed USB 2.0 host interface clock.

Use Value: 5 V input tolerance allows direct connection to legacy analog front-end ICs; half-full flag (HF) triggers preemptive DMA fetch to minimize buffer underflow.

Use Scenario: Capturing synchronized 16-bit ADC samples from 8-channel sensor array at 1 MSPS for edge AI preprocessing.

IC Role / Device Role / Timing Role: Write-side clocked by ADC sampling clock (WCLK), read-side clocked by DSP core (RCLK); PAE flag alerts when <128 words remain to prevent overflow during burst compute.

Use Value: Programmable PAE offset (default 127) matches real-time processing latency; TQFP-64 package fits compact PCB layouts with minimal trace length for signal integrity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
72V235L15TFG8	15 ns cycle time (66.7 MHz max), higher ICC1 (typ. 25 mA vs. 30 mA at 100 MHz), identical pinout and feature set.	Suitable where 100 MHz operation is unnecessary; lower power in moderate-speed systems.	Select when system clock ≤66.7 MHz and power budget favors reduced active current over peak throughput.
72V233L10TFG8	1,024 × 18-bit depth (half capacity), same 10 ns timing, identical package and flag architecture.	Applicable in space-constrained designs with smaller buffering needs, e.g., UART bridging or low-bandwidth sensor aggregation.	Choose when 1,024-word depth suffices and board area or BOM cost optimization is prioritized over maximum buffer headroom.

Compared with 72V235L15TFG8, the 72V235L10TFG8 delivers 50% higher bandwidth (100 MHz vs. 66.7 MHz) at the cost of ~20% higher active current; versus 72V233L10TFG8, it doubles depth for extended burst tolerance without changing layout or firmware flag-handling logic.

Availability

72V235L10TFG8 is available at Aetrix Electronics and suitable for industrial networking equipment, embedded controller subsystems, and real-time data acquisition systems requiring stable component supply and long-term lifecycle support.

Supply support for 72V235L10TFG8 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 signal conditioning ICs, acquired by Renesas Electronics in 2019.

The IDT72V2xx5 family was designed for high-reliability, low-latency data buffering in industrial and communications infrastructure, emphasizing configurable timing modes, expandability, and robust flag signaling for autonomous flow control.

FAQ

What is the memory organization of the 72V235L10TFG8?

The 72V235L10TFG8 features a 2,048 × 18-bit synchronous FIFO memory array, meaning it stores 2,048 words of 18-bit parallel data. This organization supports wide-data-path buffering without external addressing logic and is fixed per device - not software-configurable. The "235" in the part number explicitly denotes the 2,048-word depth within the IDT72V2xx5 family.

Does the 72V235L10TFG8 support both single-clock and dual-clock operation?

Yes, the 72V235L10TFG8 supports both configurations. When RCLK is tied to WCLK, it operates in single-clock mode with coordinated read/write timing. When driven independently, it functions in dual-clock mode - enabling asynchronous data transfer between domains. The device guarantees proper flag behavior (e.g., FF/EF) only if RCLK–WCLK skew meets tSKEW1 ≥5 ns minimum per AC specifications.

How is the First Word Fall-Through (FWFT) mode enabled on the 72V235L10TFG8?

FWFT mode is configured during hardware reset (RS LOW) using the FL, RXI, and WXI pin states per Table 3 in the datasheet. For FWFT, FL=0, RXI=0, WXI=1 selects asynchronous timing with triple/double flag buffering; FL=1, RXI=0, WXI=1 selects synchronous timing. The mode is latched at reset release and remains active until next reset - no runtime reconfiguration is possible.

What are the default programmable flag offset values for the 72V235L10TFG8?

The 72V235L10TFG8 defaults to 127 words from empty for PAE and 127 words from full for PAF - consistent with all IDT72V225/235/245 variants. These offsets are loaded into internal registers at power-up and can be modified via the LD/WEN sequence writing D0–D11. Reading back offsets is supported only in IDT Standard mode using RCLK/REN with LD LOW.

Is the 72V235L10TFG8 pin-compatible with other devices in the IDT72V2xx5 family?

Yes, all IDT72V2xx5 devices (72V205/215/225/235/245) share identical 64-pin TQFP packaging, pin assignments, and electrical interface - including D0–D17, Q0–Q17, WCLK, RCLK, and flag signals. Depth differences (256 to 4,096 words) are internal; external connections and timing parameters (e.g., tCLK=10 ns for L10 grade) are fully compatible, enabling drop-in replacement where depth requirements align.

72V235L10TFG8 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: 72V

Package/Case:: 64-LQFP

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Memory Size:: 36K (2K x 18)

Function:: Synchronous

Data Rate:: 100MHz

Access Time:: 6.5ns

Voltage - Supply:: 3 V ~ 3.6 V

Current - Supply (Max):: 30mA

Bus Directional:: Uni-Directional

Expansion Type:: Depth, Width

Programmable Flags Support:: Yes

Retransmit Capability:: No

FWFT Support:: Yes

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Supplier Device Package:: 64-TQFP (10x10)

72V235L10TFG8 FAQ

1.How can I place an order for 72V235L10TFG8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 72V235L10TFG8 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 72V235L10TFG8 reliable?

The price and inventory of 72V235L10TFG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 72V235L10TFG8 is usually 5 days.

3.What payment methods are accepted for 72V235L10TFG8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 72V235L10TFG8 transactions.

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4.How is shipping managed for 72V235L10TFG8?

72V235L10TFG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 72V235L10TFG8 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 72V235L10TFG8?

For technical support, including 72V235L10TFG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 72V235L10TFG8 requirements.

6.How does Aetrix verify that 72V235L10TFG8 is sourced from the original manufacturer or authorized distributors?

All 72V235L10TFG8 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 72V235L10TFG8 meets industry standards.

7.What is the process for return or replacement of 72V235L10TFG8?

All 72V235L10TFG8 units undergo pre-shipment inspection (PSI). If there is an issue with 72V235L10TFG8, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 72V235L10TFG8 part is unused and in its original packaging.

Return procedure for 72V235L10TFG8:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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