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Renesas 72215LB15PFGI
- Part No.:
- 72215LB15PFGI
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 64-LQFP
- Datasheet:
-
72215LB15PFGI.pdf
- Description:
- IC FIFO SYNC 512X18 10NS 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,700
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Product details
Overview
IDT72215LB15PFGI from Integrated Device Technology is a 512 × 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), used for buffering data in LAN controllers, interprocessor communication, and optical disk interfaces.
For engineers reviewing the IDT72215LB15PFGI datasheet, IDT72215LB15PFGI pinout, IDT72215LB15PFGI application, or IDT72215LB15PFGI equivalent, key selection criteria include programmable Almost-Empty/Almost-Full flag offsets, depth-expandable daisy-chain capability, TQFP-64 packaging, 5 V supply compatibility, and submicron CMOS low-power timing performance.
Technical Context
This device implements a dual-port zero fall-through time architecture with independent read and write pointer logic, supporting both asynchronous and coincident clock modes. Its flag logic includes synchronized Empty/Full flags and asynchronous Programmable Almost-Empty/Almost-Full flags with default offsets of 63 words from empty/full boundaries.
The FIFO uses high-performance submicron CMOS technology and supports depth expansion via WXI/WXO and RXI/RXO pins in daisy-chain configurations. It features dedicated offset registers loaded via LD/WEN/RCLK control sequences, enabling runtime reconfiguration of flag thresholds without interrupting data flow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 512 × 18-bit - provides 9,216 bits of buffered storage, sufficient for burst-mode packet alignment in serial-to-parallel bridging applications. |
| Cycle Time | 15 ns - enables up to 66.7 MHz clock operation, meeting timing requirements for high-speed interface synchronization between mismatched bus domains. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic families and legacy industrial power rails. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and telecom infrastructure equipment. |
| Flag Architecture | EF/FF synchronized to RCLK/WCLK; PAE/PAF asynchronous - allows real-time status monitoring without clock domain crossing constraints on critical boundary conditions. |
| Programmable Offsets | Default PAE/PAF = 63 words - configurable via D0–D11 during LD mode, enabling adaptive buffer management for variable payload sizes. |
| Package | TQFP-64 (PN64-1) - surface-mount footprint with 0.5 mm pitch, optimized for automated assembly and thermal dissipation in dense PCB layouts. |
Pinout & Package
Package: 64-lead thin quad flatpack (TQFP), PN64-1 order code, lead finish SnPb (EOL as of June 2018).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D17 | Data Inputs | 18-bit parallel write data bus; sampled on rising WCLK when WEN = LOW. |
| Q0–Q17 | Data Outputs | 18-bit parallel read data bus; driven only when OE = LOW and EF = HIGH. |
| WCLK / RCLK | Write / Read Clock | Independent clock inputs enabling asynchronous dual-clock operation or synchronous single-clock mode when tied together. |
| WEN / REN | Write / Read Enable | Active-low controls that gate data transfer; ignored when FF/EF are asserted. |
| OE | Output Enable | Tri-states Q0–Q17 outputs when HIGH, allowing shared bus usage without external buffers. |
| RS | Reset | Asynchronous reset initializing pointers and flags; required before first write after power-up. |
| LD | Load Control | Enables programming of PAE/PAF offset registers using D0–D11 (write) or reading via Q0–Q11 (read). |
| FL / WXI / RXI | Expansion Controls | Configure single-device, width-expansion, or daisy-chain depth-expansion modes; grounded in standalone use. |
| FF / EF / PAE / PAF / WXO/HF / RXO | Status & Expansion Flags | FF/EF synchronized to clocks; PAE/PAF asynchronous; WXO/HF serves as half-full indicator or daisy-chain pulse signal. |
| VCC / GND | Power & Ground | Eight dedicated ground pins and multiple VCC pins minimize noise coupling and ensure stable operation at 66.7 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-clock architecture | Enables seamless bridging between independent clock domains (e.g., CPU ↔ peripheral bus) without metastability risk from handshaking logic. |
| Programmable Almost-Empty/Almost-Full flags | Allows dynamic threshold setting for early warning of buffer underflow/overflow, supporting adaptive flow control in real-time systems. |
| Daisy-chain depth expansion | Supports stacking multiple IDT72215LB15PFGI devices to increase total depth beyond 512 words while retaining single-device control interface. |
| Half-Full flag (HF) | Provides deterministic mid-buffer status indication for load-balancing decisions in multi-stage pipeline architectures. |
| Output enable (OE) | Eliminates need for external bus transceivers in shared-data-bus topologies, reducing component count and layout complexity. |
Applications
| LAN Controller Buffering | Interprocessor Communication |
|---|---|
|
Use Scenario: Buffering Ethernet frame payloads between MAC and PHY layers with variable-length packets and bursty traffic patterns. IC Role / Device Role / Timing Role: Synchronous FIFO acting as elastic buffer to absorb clock domain skew and jitter between 25 MHz MAC and 125 MHz PHY clocks. Use Value: Prevents packet loss during clock rate mismatches; 512-word depth accommodates worst-case jumbo frame bursts with headroom for arbitration latency. |
Use Scenario: Exchanging command/status messages between two microcontrollers operating at different clock frequencies in an automotive ECU. IC Role / Device Role / Timing Role: Dual-clock FIFO decoupling write-side (main MCU) and read-side (sensor MCU) timing domains without software handshake overhead. Use Value: Enables deterministic message delivery with ≤15 ns latency per word; programmable PAE/PAF allows tuning for priority-based interrupt generation. |
| Optical Disk Interface | Industrial Data Acquisition |
|
Use Scenario: Temporarily storing sector-aligned data streams from CD/DVD read heads before error correction and host transfer. IC Role / Device Role / Timing Role: High-speed 18-bit FIFO synchronizing 33 MHz ATAPI interface with variable-rate spindle motor encoder signals. Use Value: 10 ns cycle time ensures no bottleneck at peak transfer rates; HF flag triggers DMA prefetch to maintain continuous streaming. |
Use Scenario: Aggregating analog-to-digital samples from multiple 16-bit ADCs into a unified stream for FPGA-based signal processing. IC Role / Device Role / Timing Role: Depth-expandable FIFO collecting interleaved channel data across four synchronized ADCs before batch transfer. Use Value: Daisy-chain capability scales buffer depth to match acquisition window length; industrial temp rating ensures reliability in uncooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 72215L15PF | Same die, Pb-free (RoHS-compliant) variant; identical AC/DC specs and pinout. | No functional difference; suitable for new designs requiring lead-free compliance. | Select 72215L15PF if RoHS certification is mandatory; IDT72215LB15PFGI remains viable for legacy repair or industrial stock replenishment. |
| SN74V293-15PAG | Texas Instruments 512 × 18 FIFO; 15 ns cycle time but uses 3.3 V supply and has different flag timing behavior (synchronous PAF/PAE). | Requires level-shifting for 5 V systems; not drop-in due to voltage and flag synchronization differences. | Choose SN74V293-15PAG only when migrating to 3.3 V architecture; verify flag timing alignment in dual-clock use cases before substitution. |
Compared with 72215L15PF and SN74V293-15PAG, IDT72215LB15PFGI offers native 5 V operation and asynchronous programmable flags-critical for legacy industrial systems where voltage translation adds cost and timing uncertainty.
Availability
IDT72215LB15PFGI is available at Aetrix Electronics and suitable for LAN controller buffering, interprocessor communication, and optical disk interface applications requiring stable component supply amid end-of-life transitions.
Supply support for IDT72215LB15PFGI 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-speed interconnect solutions.
IDT72215LB15PFGI belongs to the SyncFIFO™ family designed specifically for deterministic, low-latency data buffering in mixed-clock-domain systems such as networking, storage, and industrial control.
FAQ
What is the memory organization and maximum operating frequency of IDT72215LB15PFGI?
IDT72215LB15PFGI provides a 512 × 18-bit memory array, delivering 9,216 bits of synchronous FIFO storage. Its 15 ns cycle time supports a maximum clock frequency of 66.7 MHz, verified under industrial temperature conditions (–40°C to +85°C) with 5 V ±10% supply. This performance enables reliable use in high-throughput bridging applications like LAN controllers and interprocessor links.
Does IDT72215LB15PFGI support depth expansion, and how is it implemented?
Yes, IDT72215LB15PFGI supports depth expansion via daisy-chain configuration using WXI/WXO and RXI/RXO pins. In this mode, FL is grounded on the first device and set HIGH on subsequent units. Each device signals completion of full/empty conditions to the next via WXO→WXI and RXO→RXI pulses, preserving atomicity across the expanded buffer without external logic.
What are the default values for the programmable Almost-Empty and Almost-Full flags in IDT72215LB15PFGI?
IDT72215LB15PFGI defaults to 63-word offsets for both PAE and PAF flags-i.e., PAE asserts when 63 words remain before empty, and PAF asserts when 63 words remain before full. These values are stored in internal offset registers and can be reloaded dynamically via the LD/WEN/RCLK sequence using D0–D11 inputs.
Is IDT72215LB15PFGI compatible with 3.3 V logic systems?
No, IDT72215LB15PFGI is specified for 4.5 V to 5.5 V operation and is not 3.3 V tolerant. Input high voltage (VIH) requires ≥2.0 V, but DC characteristics and timing parameters are validated only at 5 V. Interfacing with 3.3 V systems requires level-shifting circuitry; for native 3.3 V operation, consider alternatives like SN74V293-15PAG.
How does the Half-Full flag (WXO/HF) function in single-device mode for IDT72215LB15PFGI?
In single-device mode (FL, WXI, RXI grounded), the WXO/HF pin functions as a Half-Full flag: it goes LOW when the FIFO contains ≥256 words (half of 512 depth) and remains LOW until the word count drops to ≤255. The flag updates asynchronously on the next WCLK edge after crossing the threshold and resets HIGH on the subsequent RCLK edge.
72215LB15PFGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 7200
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 9K (512 x 18)
- Function:
- Synchronous
- Data Rate:
- 66.7MHz
- Access Time:
- 10ns
- 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:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
72215LB15PFGI FAQ
1.How can I place an order for 72215LB15PFGI through Aetrix?
Please submit a Request for Quotation (RFQ) for 72215LB15PFGI 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 72215LB15PFGI reliable?
The price and inventory of 72215LB15PFGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 72215LB15PFGI is usually 5 days.
3.What payment methods are accepted for 72215LB15PFGI?
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4.How is shipping managed for 72215LB15PFGI?
72215LB15PFGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 72215LB15PFGI 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 72215LB15PFGI?
For technical support, including 72215LB15PFGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 72215LB15PFGI requirements.
6.How does Aetrix verify that 72215LB15PFGI is sourced from the original manufacturer or authorized distributors?
All 72215LB15PFGI 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 72215LB15PFGI meets industry standards.
7.What is the process for return or replacement of 72215LB15PFGI?
All 72215LB15PFGI units undergo pre-shipment inspection (PSI). If there is an issue with 72215LB15PFGI, 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 72215LB15PFGI part is unused and in its original packaging.
Return procedure for 72215LB15PFGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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