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Renesas 72235LB10TFG
- Part No.:
- 72235LB10TFG
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 64-LQFP
- Datasheet:
-
72235LB10TFG.pdf
- Description:
- IC FIFO SYNC 2KX18 6.5NS 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,050
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Product details
Overview
72235LB10TFG from Integrated Device Technology (IDT) is a 2,048 × 18-bit synchronous FIFO memory IC with dual-clock operation, 10 ns read/write cycle time, programmable Almost-Empty/Almost-Full flags, and Half-Full flag capability - deployed in optical disk controllers, LAN interface buffers, and interprocessor communication links.
For engineers reviewing the 72235LB10TFG datasheet, 72235LB10TFG pinout, 72235LB10TFG application, or 72235LB10TFG equivalent, this page delivers verified timing parameters, industrial-grade temperature support (–40°C to +85°C), TQFP-64 package details, and direct alternatives for depth/width expansion scenarios requiring deterministic latency and zero fall-through architecture.
Technical Context
The 72235LB10TFG implements a dual-port, zero fall-through time architecture with independent read/write pointer logic, asynchronous flag generation (PAE/PAF/HF), and synchronized status flags (EF/FF). It supports both single-clock (coincident RCLK/WCLK) and dual-clock (asynchronous RCLK/WCLK) modes with tSKEW1 ≥ 5 ns and tSKEW2 ≥ 5 ns for reliable full/empty boundary detection.
Its offset register programming enables configurable Almost-Empty (default 127 words from empty) and Almost-Full (default 127 words from full) thresholds via LD/WEN/RCLK-controlled state machine. Expansion is supported via WXI/WXO and RXI/RXO pins in daisy-chain depth configurations, with FL grounded for single-device use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 2,048 × 18-bit - provides 36,864 bits of buffered data storage for burst-to-stream conversion. |
| Cycle Time | 10 ns - enables 100 MHz maximum clock frequency for high-throughput data staging. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails. |
| Flag Latency | tWFF ≤ 6.5 ns, tREF ≤ 6.5 ns - ensures rapid full/empty status propagation synchronized to WCLK/RCLK edges. |
| Programmable Offset | 127-word default for PAE/PAF - allows precise buffer watermarking for flow control in real-time systems. |
| Output Enable Delay | tOE = 3–6 ns - guarantees fast tri-state control for bus sharing in multi-device systems. |
Pinout & Package
72235LB10TFG is housed in a 64-lead thin quad flatpack (TQFP) package with 0.5 mm pitch, 10 mm × 10 mm body, and exposed thermal pad (STQFP variant per order code TF). Pin 1 marked by top-left corner notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D17 | Data Input Bus | 18-bit parallel input path; latched on rising edge of WCLK when WEN = LOW. |
| Q0–Q17 | Data Output Bus | 18-bit parallel output; three-state controlled by OE, updated on rising RCLK when REN = LOW. |
| WCLK / RCLK | Independent Clock Inputs | Asynchronous or coincident clocks; enable deterministic dual-clock buffering with skew tolerance ≥5 ns. |
| WEN / REN | Write/Read Enable Controls | Gate data transfer; inhibit writes when FF = LOW, inhibit reads when EF = LOW. |
| OE | Output Enable | Active-LOW control for high-impedance output bus - essential for shared data bus architectures. |
| RS | Hardware Reset | Asynchronous reset of pointers and flags; required before first write after power-up. |
| LD | Offset Register Load | Enables programming of PAE/PAF thresholds via D0–D11 (write) or Q0–Q11 (read) during dedicated load cycles. |
| FL, WXI, RXI | Expansion Control Inputs | Ground for single-device mode; configure daisy-chain depth expansion with FL = LOW on first device. |
| FF, EF, PAF, PAE, WXO/HF, RXO | Status & Expansion Outputs | FF/EF are synchronous to WCLK/RCLK; PAF/PAE/HF are asynchronous; WXO/RXO drive next device in chain. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-clock zero fall-through architecture | Eliminates read-after-write latency; enables concurrent read/write at full speed without data corruption. |
| Programmable Almost-Empty/Full flags | Configurable watermarks (default 127 words) allow custom flow control without external logic or software polling. |
| Half-Full flag (HF) capability | Provides symmetric buffer occupancy signal for balanced data rate management in ping-pong or streaming applications. |
| Depth expandable via daisy-chain | WXO/RXO pins enable seamless stacking of multiple 72235LB10TFG devices to increase total FIFO depth beyond 2,048 words. |
| Industrial temperature range | –40°C to +85°C operation with no performance degradation - suitable for embedded industrial controllers and telecom line cards. |
Applications
| Optical Disk Controller Buffer | LAN Interface Data Staging |
|---|---|
|
Use Scenario: Buffers bursty read/write transfers between optical drive servo controller and host interface ASIC. IC Role / Device Role / Timing Role: Synchronous FIFO providing deterministic latency, depth-matched to sector size (2,048 bytes), with HF flag triggering DMA prefetch. Use Value: Eliminates wait states during seek operations; 10 ns cycle time sustains sustained 200 MB/s throughput across ATAPI/IDE bus. |
Use Scenario: Isolates MAC-layer packet assembly logic from PHY-layer serialization timing jitter in 10/100 Mbps Ethernet transceivers. IC Role / Device Role / Timing Role: Dual-clock FIFO decoupling asynchronous MAC clock domain (50 MHz) from PHY clock (25 MHz). Use Value: Prevents packet loss during clock domain crossing; PAF/PAE flags trigger early packet discard or backpressure signaling. |
| Interprocessor Communication Link | Real-Time Signal Processing Pipeline |
|
Use Scenario: Bridges two DSPs performing parallel FFT processing, where one generates coefficients and the other consumes them. IC Role / Device Role / Timing Role: High-reliability data conduit with RS-initiated pointer reset and EF/FF flag handshaking. Use Value: Guarantees lossless transfer of 18-bit coefficient vectors; 127-word PAF threshold prevents overflow during burst coefficient updates. |
Use Scenario: Stages sensor data between ADC sampling stage (1 MSPS) and FPGA-based FIR filter engine (200 MHz). IC Role / Device Role / Timing Role: Clock-domain translator with WCLK synchronized to ADC sample clock and RCLK derived from FPGA PLL. Use Value: Absorbs jitter-induced sample misalignment; HF flag triggers adaptive filter window shift to maintain real-time latency budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72235LB15TFG | 15 ns cycle time (66.7 MHz max), higher ICC1 typical current (2.85 + 1.30×fS mA), identical pinout and feature set. | Suitable for lower-speed designs where 100 MHz timing margin is unnecessary; reduces EMI and power consumption. | Select when system clock < 66.7 MHz and thermal/power constraints favor slower grade. |
| ON Semiconductor MC100EPF11DTG | ECL-based 2K × 18 FIFO, 3.3 V supply, 3.5 ns access time, differential PECL I/O, no programmable flags. | Used in ultra-low-latency RF front-end buffering; requires level-shifting and separate flag logic for flow control. | Choose only for sub-ns timing-critical applications with existing ECL infrastructure; not drop-in compatible. |
Compared with IDT72235LB15TFG and MC100EPF11DTG, the 72235LB10TFG uniquely balances 100 MHz performance, industrial temperature support, integrated programmable flags, and 5 V CMOS compatibility - making it optimal for cost-sensitive, mixed-signal embedded systems requiring robust, self-contained buffering.
Availability
72235LB10TFG is available at Aetrix Electronics and suitable for optical disk controllers, LAN interface modules, and interprocessor communication links requiring stable component supply and long-term industrial lifecycle support.
Supply support for 72235LB10TFG 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, and high-performance interconnect solutions.
The IDT722xxLB family was designed specifically for deterministic, low-latency data buffering in industrial and communications equipment - emphasizing clock domain isolation, expandability, and programmable flow control without external logic.
FAQ
What is the maximum operating frequency of the 72235LB10TFG?
The 72235LB10TFG supports a maximum clock cycle time of 10 ns, corresponding to a 100 MHz maximum frequency for both read and write clocks. This rating is guaranteed across the full industrial temperature range (–40°C to +85°C) and 4.5 V to 5.5 V supply voltage, with AC timing parameters including tCLKH ≥ 4.5 ns and tCLKL ≥ 4.5 ns.
Does the 72235LB10TFG support single-clock or dual-clock operation?
Yes, the 72235LB10TFG supports both modes: RCLK and WCLK may be tied together for single-clock operation, or run asynchronously for dual-clock domain bridging. The device includes tSKEW1 ≥ 5 ns and tSKEW2 ≥ 5 ns specifications to ensure reliable FF and EF flag updates under asynchronous conditions.
How is the Half-Full flag (HF) implemented on the 72235LB10TFG?
On the 72235LB10TFG, the HF function is multiplexed onto the WXO pin. In single-device mode (WXI/RXI grounded), HF asserts LOW when exactly 1,024 words (half of 2,048) are stored. It remains LOW until the difference between write and read pointers drops to ≤1,024, then resets HIGH on the next RCLK rising edge - enabling symmetric buffer monitoring without external logic.
What are the default programmable flag offsets for the 72235LB10TFG?
The 72235LB10TFG defaults to 127-word offsets for both PAE and PAF at power-on reset - meaning PAE asserts when 127 words remain before empty, and PAF asserts when 127 words remain before full. These values are stored in the offset registers and can be reprogrammed via LD/WEN sequence using D0–D11 inputs.
Can multiple 72235LB10TFG devices be cascaded for greater depth?
Yes - the 72235LB10TFG supports depth expansion via daisy-chain configuration using WXI/WXO and RXI/RXO pins. FL must be grounded on the first device and HIGH on all subsequent devices. Each device contributes its full 2,048-word depth, with WXO pulses signaling last-location writes to the next device's WXI input.
72235LB10TFG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 7200
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 36K (2K x 18)
- Function:
- Synchronous
- Data Rate:
- 100MHz
- Access Time:
- 6.5ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 60mA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Depth, Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- No
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
72235LB10TFG FAQ
1.How can I place an order for 72235LB10TFG through Aetrix?
Please submit a Request for Quotation (RFQ) for 72235LB10TFG 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 72235LB10TFG reliable?
The price and inventory of 72235LB10TFG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 72235LB10TFG is usually 5 days.
3.What payment methods are accepted for 72235LB10TFG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 72235LB10TFG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 72235LB10TFG?
72235LB10TFG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 72235LB10TFG 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 72235LB10TFG?
For technical support, including 72235LB10TFG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 72235LB10TFG requirements.
6.How does Aetrix verify that 72235LB10TFG is sourced from the original manufacturer or authorized distributors?
All 72235LB10TFG 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 72235LB10TFG meets industry standards.
7.What is the process for return or replacement of 72235LB10TFG?
All 72235LB10TFG units undergo pre-shipment inspection (PSI). If there is an issue with 72235LB10TFG, 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 72235LB10TFG part is unused and in its original packaging.
Return procedure for 72235LB10TFG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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