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Renesas 72235LB10PFG8
- Part No.:
- 72235LB10PFG8
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 64-LQFP
- Datasheet:
-
72235LB10PFG8.pdf
- Description:
- IC FIFO SYNC 2KX18 6.5NS 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,457
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Product details
Overview
72235LB10PFG8 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, and industrial temperature range (–40°C to +85°C). It supports programmable Almost-Empty/Almost-Full flags, Half-Full flag, and depth/width expansion for buffering in LAN controllers, interprocessor communication, and optical disk interfaces.
For engineers reviewing the 72235LB10PFG8 datasheet, 72235LB10PFG8 pinout, 72235LB10PFG8 application, or 72235LB10PFG8 equivalent, key selection criteria include its 18-bit bidirectional data width, asynchronous clock domain support, 5 V single-supply operation, and TQFP-64 packaging with verified pinout and flag timing behavior.
Technical Context
This device implements a dual-port zero fall-through time architecture with independent read/write pointers, offset-register-based programmable status flags (PAE/PAF), and daisy-chain expansion logic via WXI/WXO and RXI/RXO pins. Its internal RAM array is organized as 2,048 words × 18 bits, with all flags synchronized to their respective clocks (FF/PAF to WCLK; EF/PAE/HF to RCLK).
The FIFO supports both single-clock (RCLK = WCLK) and dual-clock modes, with reset-initiated pointer alignment, output enable (OE) for three-state control, and configurable default offsets (127 for PAE/PAF at power-up). Expansion requires FL grounding on first device and high-level assertion on subsequent devices in chain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 2,048 × 18-bit - provides 36,864-bit buffer capacity for high-throughput data staging between mismatched-speed subsystems. |
| Cycle Time | 10 ns - enables 100 MHz maximum clock frequency for real-time streaming in LAN and storage controllers. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails without level-shifting. |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded systems including motor drives and telecom infrastructure. |
| Flag Types | EF/FF (synchronous), PAE/PAF (asynchronous), HF (dual-purpose) - enables precise buffer management across clock domains with minimal latency overhead. |
| Package | TQFP-64 (PN64-1) - surface-mount package with 0.5 mm pitch, suitable for automated PCB assembly and thermal dissipation up to 60 mA ICC1. |
| Expansion Support | Daisy-chain depth expansion via WXI/WXO and RXI/RXO - allows stacking multiple 72235LB10PFG8 units to build larger FIFOs without external logic. |
Pinout & Package
72235LB10PFG8 is packaged in a 64-lead thin quad flatpack (TQFP) with 0.5 mm pitch, compliant with JEDEC MO-159AC. The package includes seven ground pins and five VCC pins distributed for low-noise power delivery.
| 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 path; driven only when OE = LOW and REN = LOW. |
| WCLK / RCLK | Independent Clock Inputs | Asynchronous clock domains: WCLK controls write pointer advancement; RCLK controls read pointer and EF/HF/PAE timing. |
| WEN / REN | Write/Read Enable Controls | Active-LOW enables data transfer per clock edge; ignored when FF = LOW (write) or EF = LOW (read). |
| OE | Output Enable | Active-LOW enables Q-bus drivers; HIGH places outputs in high-impedance state for bus sharing. |
| RS | Master Reset | Active-LOW resets both pointers to zero, initializes flags (FF/PAF = HIGH; EF/PAE = LOW), and clears output register. |
| LD | Offset Register Load Control | Active-LOW initiates loading of PAE/PAF offset values from D0–D11 (write mode) or reads them to Q0–Q11 (read mode). |
| FL / WXI / RXI | Expansion Configuration | FL = LOW indicates first device in daisy chain; WXI/RXI = LOW for single-device or width-expansion mode. |
| WXO/HF / RXO | Expansion Outputs | WXO/HF serves as half-full indicator (single device) or pulse signal to next device's WXI (depth expansion); RXO pulses on last-read event. |
| FF / EF / PAF / PAE | Status Flags | FF: asserted LOW when full (synchronized to WCLK); EF: asserted LOW when empty (synchronized to RCLK); PAF/PAE: asynchronous, programmable thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-clock domain operation | Enables seamless bridging between independent clock domains (e.g., CPU ↔ peripheral bus) without handshake logic or glue circuitry. |
| Programmable Almost-Empty/Full flags | Default 127-word offset allows early warning of buffer underflow/overflow, enabling proactive DMA or interrupt-driven data flow control. |
| Half-Full flag (HF) | Provides deterministic midpoint status for balanced read/write scheduling in real-time streaming applications like video frame buffering. |
| Daisy-chain depth expansion | Supports cascading multiple 72235LB10PFG8 devices using WXO→WXI and RXO→RXI connections, scaling total depth linearly without external address logic. |
| Zero fall-through time architecture | Eliminates pipeline delay between write and subsequent read of same location-critical for low-latency echo cancellation or test pattern generation. |
Applications
| LAN Controller Buffering | Interprocessor Communication |
|---|---|
Use Scenario: High-speed packet buffering between MAC and PHY layers in 10/100 Mbps Ethernet controllers. IC Role / Device Role / Timing Role: Synchronous FIFO decouples variable-length packet arrival from fixed-rate transmit scheduling. Use Value: 2,048-word depth absorbs bursty traffic while 10 ns cycle time sustains line-rate throughput without backpressure. | Use Scenario: Shared-memory messaging between heterogeneous processors (e.g., DSP + ARM) with mismatched clock domains. IC Role / Device Role / Timing Role: Dual-clock FIFO acts as timing-isolated data conduit with independent read/write clocks. Use Value: Asynchronous EF/FF flags prevent race conditions; programmable PAE/PAF enable adaptive flow control based on software-defined thresholds. |
| Optical Disk Controller Interface | Industrial Motion Control Buffering |
Use Scenario: Buffering sector data between CD/DVD read head electronics and host interface controller. IC Role / Device Role / Timing Role: High-reliability FIFO manages jitter-prone analog-to-digital sampling streams before error correction processing. Use Value: Industrial temperature rating (–40°C to +85°C) ensures stable operation in enclosed optical drive enclosures; Half-Full flag aids servo loop timing predictability. | Use Scenario: Staging position commands and feedback data between motion controller FPGA and servo amplifier. IC Role / Device Role / Timing Role: Deterministic latency FIFO synchronizes real-time command execution with encoder sampling intervals. Use Value: Zero fall-through time guarantees immediate visibility of newly written control words; daisy-chain expansion supports multi-axis coordination with shared buffer pool. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72235LB15PFG8 | 15 ns cycle time (vs. 10 ns); lower max clock frequency (66.7 MHz vs. 100 MHz); identical pinout and feature set. | Suitable for cost-sensitive designs where 100 MHz timing margin is unnecessary; reduced power consumption at lower frequency. | Select when system clock rate ≤66.7 MHz and timing slack permits relaxed cycle time. |
| ON Semiconductor NB3N502DG | 2,048 × 9-bit configuration (half width); LVDS-compatible I/O; 3.3 V supply only; no PAE/PAF programming. | Targeted at serial-link buffering (e.g., PCIe gen1); lacks programmable flags and industrial temp grade. | Choose only for narrow-bus, low-voltage, high-speed serial applications-not drop-in replacement for 18-bit parallel buffering. |
Compared with IDT72235LB15PFG8, the 72235LB10PFG8 delivers 50% faster throughput for time-critical buffering; versus NB3N502DG, it offers double data width, 5 V compatibility, and full flag programmability essential for deterministic industrial control.
Availability
72235LB10PFG8 is available at Aetrix Electronics and suitable for LAN controllers, interprocessor communication links, and optical disk interfaces requiring stable component supply and long-term industrial-grade availability.
Supply support for 72235LB10PFG8 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 solutions for communications, computing, and industrial markets.
The IDT722xxLB SyncFIFO family was designed specifically for high-speed, low-latency data buffering in systems requiring clock domain isolation, programmable flow control, and scalable memory depth-targeting networking, storage, and real-time embedded applications.
FAQ
What is the maximum operating frequency of the 72235LB10PFG8?
The 72235LB10PFG8 supports a maximum clock frequency of 100 MHz, derived from its 10 ns read/write cycle time specification. This timing is guaranteed across the full industrial temperature range (–40°C to +85°C) and 4.5 V to 5.5 V supply voltage. Both WCLK and RCLK may operate at this rate independently in dual-clock mode, enabling sustained 100 MHz data throughput in each direction.
Does the 72235LB10PFG8 support depth expansion, and how is it implemented?
Yes, the 72235LB10PFG8 supports daisy-chain depth expansion using WXO/HF and RXO outputs connected to WXI and RXI inputs of subsequent devices. In this configuration, FL must be grounded on the first device and pulled HIGH on all others. Each device contributes its full 2,048-word depth, allowing linear scaling of total FIFO capacity without external address decoding logic.
What are the default offset values for the PAE and PAF flags in the 72235LB10PFG8?
The 72235LB10PFG8 defaults to a 127-word offset for both Programmable Almost-Empty (PAE) and Programmable Almost-Full (PAF) flags after reset. This means PAE asserts LOW when 127 words remain before empty, and PAF asserts LOW when 127 words remain before full-providing robust early-warning margins for flow control in real-time systems.
How does the Half-Full (HF) flag behave in single-device mode versus daisy-chain mode?
In single-device mode, the 72235LB10PFG8's WXO/HF pin functions as a Half-Full flag, going LOW when exactly 1,024 words (half of 2,048) are stored and remaining LOW until the count drops to ≤1,023. In daisy-chain depth expansion mode, WXO/HF instead generates a pulse upon writing to the last physical location of that device's RAM, signaling the next device to accept data.
Is the 72235LB10PFG8 pin-compatible with other members of the IDT722xxLB family?
Yes, all IDT722xxLB devices-including 72205LB, 72215LB, 72225LB, 72235LB, and 72245LB-share identical pinouts and package footprints (TQFP-64 and PLCC-68). This allows direct substitution within the same PCB layout when adjusting buffer depth (256–4,096 words), provided timing and power requirements are met for the selected speed grade.
72235LB10PFG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 7200
- 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:
- 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 (14x14)
72235LB10PFG8 FAQ
1.How can I place an order for 72235LB10PFG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 72235LB10PFG8 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 72235LB10PFG8 reliable?
The price and inventory of 72235LB10PFG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 72235LB10PFG8 is usually 5 days.
3.What payment methods are accepted for 72235LB10PFG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 72235LB10PFG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 72235LB10PFG8?
72235LB10PFG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 72235LB10PFG8 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 72235LB10PFG8?
For technical support, including 72235LB10PFG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 72235LB10PFG8 requirements.
6.How does Aetrix verify that 72235LB10PFG8 is sourced from the original manufacturer or authorized distributors?
All 72235LB10PFG8 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 72235LB10PFG8 meets industry standards.
7.What is the process for return or replacement of 72235LB10PFG8?
All 72235LB10PFG8 units undergo pre-shipment inspection (PSI). If there is an issue with 72235LB10PFG8, 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 72235LB10PFG8 part is unused and in its original packaging.
Return procedure for 72235LB10PFG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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