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Renesas 72V205L15PFGI8
- Part No.:
- 72V205L15PFGI8
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 64-LQFP
- Datasheet:
-
72V205L15PFGI8.pdf
- Description:
- IC FIFO SYNC 256X18 10NS 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,768
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Product details
Overview
72V205L15PFGI8 from Integrated Device Technology (IDT) is a 3.3 V, 256 × 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 IDT Standard and First Word Fall-Through (FWFT) timing modes and is used for data buffering in LAN controllers, interprocessor communication, and optical disk interfaces.
For engineers reviewing the 72V205L15PFGI8 datasheet, 72V205L15PFGI8 pinout, 72V205L15PFGI8 application, or 72V205L15PFGI8 equivalent, key selection factors include its 15 ns speed grade, 64-pin TQFP package, programmable almost-empty/empty flags, and dual-clock asynchronous operation capability.
Technical Context
The 72V205L15PFGI8 implements a clocked, dual-port FIFO architecture with independent read (RCLK/REN) and write (WCLK/WEN) control paths. Its flag logic supports configurable register buffering (single/double/triple) and synchronous/asynchronous timing for PAE/PAF flags, selected at reset via FL/RXI/WXI pins.
It features 18-bit parallel I/O, 5 V-tolerant inputs, output enable (OE) for three-state control, and depth/width expansion support via WXO/RXO daisy-chaining. The device uses high-speed submicron CMOS and delivers 100 MHz maximum clock frequency under commercial conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 256 × 18 bits - fixed buffer size suitable for short-packet buffering without external address management |
| Cycle Time | 15 ns - guarantees ≤15 ns latency between clock edge and valid flag/data transitions |
| Supply Voltage | 3.0–3.6 V - compatible with 3.3 V system rails; 5 V input tolerance simplifies interface with legacy 5 V logic |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and telecom infrastructure |
| Max Clock Frequency | 66.7 MHz - derived from 15 ns tCLK; enables sustained 66.7 Mwords/s throughput in dual-clock mode |
| Flag Configuration | Programmable PAE/PAF offsets + HF flag - allows custom flow-control thresholds for real-time data pacing |
| Package | 64-pin TQFP (10 mm × 10 mm) - surface-mount compatible with standard reflow profiles and IPC-7351B land patterns |
Pinout & Package
72V205L15PFGI8 is housed in a 64-lead thin quad flatpack (TQFP), order code PF, with 0.5 mm lead pitch and exposed thermal pad (not electrically connected). Pin 1 is marked by a corner notch; pin numbering follows standard counter-clockwise convention from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D17 | Data Input Bus | 18-bit parallel write path; accepts data on WCLK rising edge when WEN = LOW |
| Q0–Q17 | Data Output Bus | 18-bit parallel read path; outputs data on RCLK rising edge when REN = LOW and OE = LOW |
| WCLK / RCLK | Independent Clock Inputs | Asynchronous or coincident clocks; skew tolerance ≥6 ns ensures robust dual-clock domain crossing |
| WEN / REN | Write/Read Enable Controls | Active-LOW enables; inhibit writes when FF = LOW, reads when EF/OR = LOW |
| OE | Output Enable | Active-LOW places Q0–Q17 in high-impedance state - enables bus sharing without external transceivers |
| RS | Hardware Reset | Active-LOW initializes pointers, flags, and offset registers; required before first write after power-up |
| LD | Offset Load Control | Active-LOW enables loading of PAE/PAF offset values from D0–D11 into internal registers on WCLK/RCLK edges |
| FL / WXI / RXI | Configuration Inputs | Set timing mode (Standard/FWFT), flag buffering depth, and PAE/PAF synchronization at reset (per Table 3) |
| FF/IR / EF/OR / PAE / PAF / HF / WXO / RXO | Status & Expansion Flags | Open-drain-compatible outputs; HF indicates >128 words stored; WXO/RXO enable daisy-chain depth expansion |
| VCC / GND | Power & Ground | One VCC (3.3 V) and seven GND pins - low-inductance layout minimizes switching noise and ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| First Word Fall-Through (FWFT) mode | Delivers first written word to Q-bus within 3 RCLK cycles - eliminates initial read latency in streaming applications |
| Programmable Almost-Empty/Full flags | Configurable thresholds via LD-controlled offset registers - enables adaptive flow control without firmware intervention |
| Dual-clock asynchronous operation | Supports independent RCLK/WCLK domains with guaranteed setup/hold and skew margins - simplifies clock domain crossing |
| Depth expandability via daisy chain | WXO/RXO pins allow stacking multiple 72V205L15PFGI8 devices to form larger FIFOs - no external logic required |
| Industrial temperature qualification | Validated across –40°C to +85°C - ensures reliable operation in uncontrolled ambient environments |
Applications
| LAN Controller Buffering | Interprocessor Communication |
|---|---|
|
Use Scenario: Buffering Ethernet MAC-to-PCIe bridge traffic with bursty packet arrival and deterministic egress scheduling. IC Role / Device Role / Timing Role: Synchronous FIFO decouples mismatched clock domains (e.g., 125 MHz PCIe vs. 50 MHz MAC) while maintaining packet integrity. Use Value: 256 × 18-bit depth absorbs typical Ethernet frame bursts; FWFT mode reduces first-packet latency by up to 3 clock cycles. |
Use Scenario: Real-time data exchange between DSP and microcontroller in motor control systems with strict jitter budgets. IC Role / Device Role / Timing Role: Dual-clock FIFO isolates processor clocks and provides handshake-free data transfer using EF/OR and FF/IR flags. Use Value: 15 ns cycle time supports >66 MHz handshaking; programmable PAE/PAF enables dynamic buffer watermarking for priority task preemption. |
| Optical Disk Controller Interface | Industrial PLC Data Acquisition |
|
Use Scenario: Bridging ATAPI/ATA interface between DVD controller ASIC and host processor during high-speed read/write operations. IC Role / Device Role / Timing Role: 18-bit wide FIFO matches CD/DVD sector data width; OE pin enables shared data bus with other peripherals. Use Value: 5 V-tolerant inputs interface directly with legacy ATA signaling; Half-Full flag triggers DMA prefetch before buffer underflow. |
Use Scenario: Aggregating analog sensor samples from multiple ADCs into a single FPGA-based processing pipeline. IC Role / Device Role / Timing Role: Industrial-grade FIFO buffers time-stamped samples across clock domains (e.g., 10 MHz ADC vs. 100 MHz FPGA fabric). Use Value: –40°C to +85°C rating ensures reliability in cabinet-mounted PLCs; RS pin enables synchronized reset during firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 72V205L15TFGI8 | Same die, STQFP package (PP64-1); identical electrical specs and timing | Requires different PCB footprint and reflow profile due to thinner STQFP body and thermal pad design | Select when board space constraints favor STQFP or thermal dissipation requires enhanced pad exposure |
| 72V205L10PFGI8 | 10 ns cycle time (100 MHz max), otherwise identical pinout, functionality, and package | Higher performance margin for systems requiring tighter timing closure or future frequency scaling | Choose when design targets >66.7 MHz clock rates or needs headroom for signal integrity derating |
Compared with 72V205L15PFGI8, the 72V205L15TFGI8 offers identical functionality in a thermally optimized STQFP, while the 72V205L10PFGI8 provides faster timing at the cost of higher power consumption - both require no schematic changes but may need layout adjustments.
Availability
72V205L15PFGI8 is available at Aetrix Electronics and suitable for LAN controllers, interprocessor communication links, and optical disk interfaces requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for 72V205L15PFGI8 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-speed, low-power synchronous data buffering in communications and embedded systems - emphasizing clock domain isolation, programmable flow control, and industrial reliability.
FAQ
What is the maximum operating frequency of the 72V205L15PFGI8?
The 72V205L15PFGI8 supports a maximum clock frequency of 66.7 MHz, derived from its 15 ns cycle time specification. This applies to both RCLK and WCLK under industrial conditions (VCC = 3.3 V ± 0.3 V, TA = –40°C to +85°C). The device achieves this while maintaining full timing compliance for all flags and data outputs, as verified in AC Electrical Characteristics tables.
Does the 72V205L15PFGI8 support both IDT Standard and First Word Fall-Through (FWFT) timing modes?
Yes, the 72V205L15PFGI8 supports both timing modes. Mode selection occurs during hardware reset (RS assertion) based on the logic levels of FL, RXI, and WXI pins per Table 3 in the datasheet. In FWFT mode, the first written word appears on Q0–Q17 within three RCLK cycles without requiring REN assertion - a key differentiator for low-latency streaming.
How is the Half-Full (HF) flag asserted in the 72V205L15PFGI8?
The HF flag goes LOW when exactly 129 words are stored in the 72V205L15PFGI8 - i.e., one word beyond half capacity (256/2 = 128). This behavior is consistent across both IDT Standard and FWFT modes and is independent of programmable flag offsets. HF is internally generated and does not require external configuration.
Can the 72V205L15PFGI8 be used in a daisy-chain depth expansion configuration?
Yes, the 72V205L15PFGI8 supports daisy-chain depth expansion using WXO and RXO pins. In this configuration, FL is grounded on the first device and pulled HIGH on subsequent devices. WXI and RXI of each downstream device connect to WXO and RXO of the prior device, enabling seamless stacking without external logic or address decoding.
What are the default programmable flag offset values for the 72V205L15PFGI8?
The 72V205L15PFGI8 defaults to an empty offset (n) of 31 and a full offset (m) of 31 at reset. This means PAE asserts LOW when 31 words remain before empty, and PAF asserts LOW when 31 words remain before full. These values can be reloaded via LD-controlled writes to D0–D11 during normal operation or reset sequence.
72V205L15PFGI8 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:
- 4.5K (256 x 18)
- Function:
- Synchronous
- Data Rate:
- 66.7MHz
- Access Time:
- 10ns
- 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:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
72V205L15PFGI8 FAQ
1.How can I place an order for 72V205L15PFGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 72V205L15PFGI8 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 72V205L15PFGI8 reliable?
The price and inventory of 72V205L15PFGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 72V205L15PFGI8 is usually 5 days.
3.What payment methods are accepted for 72V205L15PFGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 72V205L15PFGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 72V205L15PFGI8?
72V205L15PFGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 72V205L15PFGI8 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 72V205L15PFGI8?
For technical support, including 72V205L15PFGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 72V205L15PFGI8 requirements.
6.How does Aetrix verify that 72V205L15PFGI8 is sourced from the original manufacturer or authorized distributors?
All 72V205L15PFGI8 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 72V205L15PFGI8 meets industry standards.
7.What is the process for return or replacement of 72V205L15PFGI8?
All 72V205L15PFGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 72V205L15PFGI8, 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 72V205L15PFGI8 part is unused and in its original packaging.
Return procedure for 72V205L15PFGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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