My Inquiry
My Account
Renesas 72225LB15TFGI8
- Part No.:
- 72225LB15TFGI8
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 64-LQFP
- Datasheet:
-
72225LB15TFGI8.pdf
- Description:
- IC FIFO SYNC 1KX18 10NS 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,078
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
72225LB15TFGI8 from Integrated Device Technology (IDT) is a 1,024 × 18-bit synchronous FIFO memory IC with dual-clock operation, 15 ns clock cycle time, and industrial temperature range (–40°C to +85°C). It provides programmable Almost-Empty/Almost-Full flags, Half-Full flag, and depth/width expandability for buffering in LAN controllers, interprocessor communication, and optical disk interfaces.
For engineers reviewing the 72225LB15TFGI8 datasheet, 72225LB15TFGI8 pinout, 72225LB15TFGI8 application, or 72225LB15TFGI8 equivalent, key selection criteria include its 18-bit bidirectional data width, asynchronous read/write clock support, 10 ns access time, and TQFP-64 package compatibility with legacy IDT SyncFIFO designs.
Technical Context
This device implements a dual-port zero fall-through time architecture with independent read/write pointers, offset-register-based programmable status flags, and daisy-chain expansion logic via WXI/WXO and RXI/RXO pins. Its internal RAM array is organized as 1,024 words × 18 bits, supporting both single-clock (coincident RCLK/WCLK) and dual-clock (asynchronous RCLK/WCLK) modes.
Flag generation is synchronized to respective clocks: EF and PAE to RCLK, FF and PAF to WCLK, while HF and expansion signals are edge-triggered on write/read completion. Reset initializes pointers and default offsets (127 for PAE/PAF), and LD enables direct programming of 12-bit empty/full offset registers via D0–D11 inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 1,024 × 18-bit - supports buffering up to 1,024 words of 18-bit parallel data without external address management. |
| Clock Cycle Time | 15 ns - enables 66.7 MHz maximum clock frequency for high-throughput data streaming applications. |
| Data Access Time | 10 ns - guarantees valid output data within 10 ns after RCLK rising edge, critical for timing-critical interface synchronization. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and telecom infrastructure. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic systems and tolerant of rail variation in noisy power domains. |
| Power Consumption | ICC1 ≤ 60 mA active, ICC2 ≤ 5 mA standby - low static and dynamic power suitable for power-sensitive embedded systems. |
| Flag Latency | tRSF ≤ 20 ns - ensures reset-to-flag assertion delay remains under 20 ns, enabling fast system initialization and recovery. |
Pinout & Package
72225LB15TFGI8 is packaged in a 64-lead thin quad flatpack (TQFP), designated by order code "TF" per IDT documentation. The package features seven ground pins and multiple VCC pins distributed for noise reduction and signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D17 | Data Inputs | 18-bit parallel input bus accepting data on WCLK rising edge when WEN = LOW. |
| Q0–Q17 | Data Outputs | 18-bit parallel output bus driving data on RCLK rising edge when REN = LOW and OE = LOW. |
| WCLK / RCLK | Write / Read Clock | Independent clock inputs enabling asynchronous or coincident operation; each controls pointer advancement and flag updates. |
| WEN / REN | Write / Read Enable | Active-LOW enables data transfer per clock edge; ignored when FIFO is full/empty to prevent overflow/underflow. |
| OE | Output Enable | Active-LOW places Q0–Q17 in active drive state; HIGH forces high-impedance for bus sharing or tri-state control. |
| RS | Reset | Active-LOW resets read/write pointers to zero, clears EF/PAE, sets FF/PAF/HF, and initializes offset registers to defaults. |
| LD | Load Control | Enables programming of 12-bit empty/full offset registers via D0–D11 (write) or Q0–Q11 (read) during dedicated load cycles. |
| EF / FF / PAE / PAF / HF | Status Flags | Asynchronous/synchronous outputs indicating FIFO occupancy state; used for handshaking and flow control in host systems. |
| WXI / WXO / RXI / RXO / FL | Expansion Interface | Supports daisy-chain depth expansion: FL selects first device; WXI/RXI grounded in single-device mode; WXO/RXO propagate full/empty pulses. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-clock architecture | Enables independent read/write clock domains (RCLK/WCLK), eliminating clock domain crossing logic in bridging applications. |
| Programmable Almost-Empty/Full flags | 12-bit offset registers allow custom trigger points (e.g., 127 words from empty/full), enabling precise buffer management in real-time systems. |
| Half-Full flag (HF) | Provides deterministic mid-buffer indication for balanced read/write scheduling without polling or software overhead. |
| Daisy-chain expansion | WXO/RXO pins enable seamless depth expansion across multiple devices while preserving single-device timing behavior. |
| Zero fall-through time | Guarantees immediate availability of first written word on read port after reset, reducing latency in burst-mode transfers. |
| Industrial-grade reliability | Qualified over –40°C to +85°C with 5.5 V absolute max rating and 10 ns undershoot tolerance, ensuring robustness in harsh environments. |
Applications
| LAN Controller Buffering | Interprocessor Communication |
|---|---|
Use Scenario: High-speed packet buffering between MAC and PHY layers in Ethernet switches and routers. IC Role / Device Role / Timing Role: Synchronous FIFO providing elastic storage to absorb jitter between mismatched clock domains (e.g., 125 MHz PHY vs. 100 MHz MAC). Use Value: Eliminates need for complex clock-domain-crossing FIFOs; 1,024-word depth accommodates worst-case packet bursts without overflow. | Use Scenario: Data exchange between heterogeneous processors (e.g., DSP and microcontroller) with independent clock trees. IC Role / Device Role / Timing Role: Dual-clock FIFO acting as a decoupling buffer, isolating read/write timing and preventing lock-step dependency. Use Value: Programmable PAE/PAF flags enable adaptive flow control-halting writes when receiver falls behind, avoiding data loss. |
| Optical Disk Controller Interface | Industrial Motion Control |
Use Scenario: Buffering sector data between optical pickup head and host controller during CD/DVD read/write operations. IC Role / Device Role / Timing Role: High-reliability FIFO managing variable-rate data streams from servo-controlled spindle motors and laser heads. Use Value: Industrial temperature rating (–40°C to +85°C) and 15 ns timing ensure stable operation inside enclosed optical drives. | Use Scenario: Real-time command and feedback buffering in CNC machines and robotic arms with strict jitter budgets. IC Role / Device Role / Timing Role: Deterministic latency FIFO synchronizing motion profile commands (from PLC) with encoder feedback (to servo driver). Use Value: HF flag triggers preemptive fetch of next motion segment; zero fall-through time minimizes command-to-action delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72225LB10TFGI | 10 ns clock cycle (100 MHz max), same 1,024×18 organization and TQFP-64 package. | Higher speed required for tighter timing margins; identical pinout and register compatibility. | Select when system clock exceeds 66.7 MHz and timing budget allows faster propagation delays. |
| ICS72225B15T | Post-IDT acquisition part from Renesas (formerly IDT); identical electrical specs and pinout, but updated green packaging and extended lifecycle support. | No functional change; preferred for new designs requiring long-term supply assurance and RoHS compliance. | Choose for production continuity and environmental compliance where legacy IDT branding is not mandated. |
Compared with 72225LB15TFGI8, IDT72225LB10TFGI offers higher speed at the cost of increased power and stricter layout constraints, while ICS72225B15T delivers identical performance with enhanced manufacturability and supply chain resilience.
Availability
72225LB15TFGI8 is available at Aetrix Electronics and suitable for LAN controllers, interprocessor communication links, optical disk interfaces, and industrial motion control systems requiring stable component supply and proven industrial-temperature reliability.
Supply support for 72225LB15TFGI8 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, Inc. (IDT) was a U.S.-based semiconductor company specializing in timing, memory interface, RF, and high-performance FIFO solutions before its acquisition by Renesas Electronics in 2019.
The IDT722xxLB family was designed specifically for high-speed, low-latency data buffering in communications and computing systems where deterministic timing and expandable depth are essential.
FAQ
What is the memory organization of the 72225LB15TFGI8?
The 72225LB15TFGI8 implements a 1,024 × 18-bit synchronous FIFO memory array. This means it stores up to 1,024 words, each 18 bits wide, with fully clocked read and write ports. The organization is fixed and does not require external address decoding, simplifying integration into data-path architectures where the 72225LB15TFGI8 serves as a dedicated elastic buffer.
Does the 72225LB15TFGI8 support asynchronous read and write clocks?
Yes, the 72225LB15TFGI8 supports fully asynchronous operation: RCLK and WCLK may run at different frequencies and phases. Flag updates (EF synchronized to RCLK, FF to WCLK) and data transfers remain reliable under this condition. The 72225LB15TFGI8 also supports coincident clocks for single-clock systems, maintaining full functionality in either mode without configuration changes.
What are the default values for the programmable Almost-Empty and Almost-Full offsets in the 72225LB15TFGI8?
The 72225LB15TFGI8 defaults to an Almost-Empty offset of 127 and an Almost-Full offset of 127 at power-on reset. These values mean PAE asserts when 127 words remain before empty, and PAF asserts when 127 words remain before full. Both offsets are stored in 12-bit registers and can be reprogrammed using the LD pin and D0–D11 inputs during dedicated load cycles.
Can the 72225LB15TFGI8 be used in depth-expansion configurations?
Yes, the 72225LB15TFGI8 supports daisy-chain depth expansion using WXI/WXO and RXI/RXO pins. In such configurations, FL is grounded on the first device and pulled HIGH on subsequent devices. The 72225LB15TFGI8 propagates write/read completion pulses via WXO/RXO, enabling seamless extension beyond 1,024 words while retaining all flag functionality and timing characteristics of a single device.
Is the 72225LB15TFGI8 compatible with 3.3 V logic systems?
No, the 72225LB15TFGI8 is a 5 V-only device with VCC specified from 4.5 V to 5.5 V. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output drive levels (VOH ≥ 2.4 V at –2 mA, VOL ≤ 0.4 V at 8 mA) are designed for TTL/5 V CMOS compatibility. Interfacing with 3.3 V systems requires level-shifting circuitry; direct connection risks unreliable operation or damage.
72225LB15TFGI8 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:
- 18K (1K 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 (10x10)
72225LB15TFGI8 FAQ
1.How can I place an order for 72225LB15TFGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 72225LB15TFGI8 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 72225LB15TFGI8 reliable?
The price and inventory of 72225LB15TFGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 72225LB15TFGI8 is usually 5 days.
3.What payment methods are accepted for 72225LB15TFGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 72225LB15TFGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 72225LB15TFGI8?
72225LB15TFGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 72225LB15TFGI8 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 72225LB15TFGI8?
For technical support, including 72225LB15TFGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 72225LB15TFGI8 requirements.
6.How does Aetrix verify that 72225LB15TFGI8 is sourced from the original manufacturer or authorized distributors?
All 72225LB15TFGI8 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 72225LB15TFGI8 meets industry standards.
7.What is the process for return or replacement of 72225LB15TFGI8?
All 72225LB15TFGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 72225LB15TFGI8, 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 72225LB15TFGI8 part is unused and in its original packaging.
Return procedure for 72225LB15TFGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
72225LB15TFGI8 Tags
-
7201LA15JGI
Renesas
-
7204L12JG
Renesas
-
72V82L15PAG8
Renesas
-
7205L15JGI
Renesas
-
7208L20JG
Renesas
-
72V2105L10PFG
Renesas
-
72V2111L15PFGI
Renesas
-
72V2113L6PFG
Renesas
-
72V36110L6PFG
Renesas
-
SN74ALVC7804-40DL
Texas Instruments
-
7202LA25JGI
Renesas
-
SN74V245-15PAG
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
