My Inquiry
My Account
Renesas 72245LB10PFG
- Part No.:
- 72245LB10PFG
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 64-LQFP
- Datasheet:
-
72245LB10PFG.pdf
- Description:
- IC FIFO SYNC 4KX18 6.5NS 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,255
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
IDT72245LB10PFG from Integrated Device Technology is a 4,096 × 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 high-speed data streams in LAN controllers and interprocessor communication interfaces.
For engineers reviewing the IDT72245LB10PFG datasheet, IDT72245LB10PFG pinout, IDT72245LB10PFG application, or IDT72245LB10PFG equivalent, key selection criteria include programmable almost-empty/almost-full flag offsets, depth-expandable daisy-chain capability, dual-port zero fall-through architecture, and TQFP-64 packaging with 18-bit parallel I/O.
Technical Context
This device implements a clocked, dual-port FIFO with independent write (WCLK/WEN) and read (RCLK/REN) control paths, supporting both synchronous and asynchronous clock domains. It features dedicated offset registers for PAE/PAF flags, reset-synchronized pointer initialization, and output enable (OE) for three-state bus control.
The architecture includes input/output registers, RAM array, expansion logic, and flag generation circuitry synchronized to respective clocks - EF to RCLK, FF to WCLK, and PAF/PAE asynchronously updated across clock domains. Half-full (HF) and expansion signals (WXO/RXO) support depth expansion in daisy-chain configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 4,096 × 18-bit - supports up to 4,096 words of 18-bit parallel data buffering without external logic. |
| Cycle Time | 10 ns - enables 100 MHz maximum clock frequency for high-throughput data transfer in real-time systems. |
| 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 rails and tolerant of ±10% regulation variation. |
| Flag Outputs | EF, FF, PAE, PAF, HF - provide real-time status signaling with default offsets (127 words from empty/full) for immediate system-level flow control. |
| Expansion Interface | WXI/WXO and RXI/RXO pins - enable seamless depth expansion beyond 4,096 words using daisy-chain topology with FL-controlled sequencing. |
Pinout & Package
Package: 64-lead thin quad flatpack (TQFP-64), lead finish SnPb (EOL as of June 2018), industrial-grade thermal rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D17 | Data Inputs | 18-bit parallel write data bus; sampled on rising edge of WCLK when WEN = LOW. |
| Q0–Q17 | Data Outputs | 18-bit parallel read data bus; driven only when OE = LOW and REN = LOW. |
| WCLK, RCLK | Clock Inputs | Independent write/read clocks; support coincident or asynchronous operation with skew tolerance ≥5 ns. |
| WEN, REN, OE | Control Enables | Enable gating for write, read, and output buffer - critical for burst-mode and partial-buffer access control. |
| RS, LD, FL | Configuration Controls | RS resets pointers and flags; LD loads offset registers; FL selects single-device vs. daisy-chain mode. |
| FF, EF, PAF, PAE, WXO/HF, RXO | Status & Expansion Outputs | FF/EF indicate full/empty boundaries; PAF/PAE support programmable thresholds; WXO/HF and RXO enable multi-device chaining. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-clock architecture | Enables asynchronous data rate matching between source and sink domains (e.g., CPU ↔ peripheral) without handshake logic. |
| Programmable flag offsets | 12-bit offset registers allow custom PAE/PAF trigger points (default 127 words from empty/full), enabling adaptive flow control. |
| Zero fall-through time | First word written appears at Q outputs on next RCLK edge - eliminates latency in pipeline-critical applications like packet forwarding. |
| Depth expandability | Daisy-chain via WXI/WXO and RXI/RXO supports >4,096-word buffers with automatic pointer synchronization across devices. |
| Industrial temperature grade | Validated operation from –40°C to +85°C ensures reliability in harsh environments such as base station equipment and motor drives. |
Applications
| Optical Disk Controller Buffering | Local Area Network (LAN) Bridge FIFO |
|---|---|
Use Scenario: Temporary storage of sector-aligned data between optical pickup head and host interface during seek/write operations. IC Role / Device Role / Timing Role: Synchronous FIFO providing jitter-free data staging with deterministic 10 ns access timing and full/empty flag signaling. Use Value: Prevents data loss during mechanical latency spikes by decoupling variable-speed media access from fixed-rate host bus transfers. |
Use Scenario: Buffering Ethernet frames between MAC layer and PHY transceiver in full-duplex switch fabric. IC Role / Device Role / Timing Role: Dual-clock FIFO absorbing clock domain mismatches between 25 MHz MAC and 125 MHz PHY clock domains. Use Value: Eliminates need for complex handshaking logic while maintaining frame integrity across asynchronous clock boundaries. |
| Interprocessor Communication Link | Real-Time Industrial PLC Data Exchange |
Use Scenario: Shared memory interface between two microcontrollers running at different clock frequencies in a distributed control system. IC Role / Device Role / Timing Role: Clock-domain crossing FIFO with programmable almost-full/empty flags for dynamic load balancing. Use Value: Enables predictable message passing with minimal software overhead and no risk of pointer collision or overrun. |
Use Scenario: Isolating sensor acquisition subsystem (fast sampling) from deterministic control loop execution (fixed cycle time). IC Role / Device Role / Timing Role: Industrial-grade FIFO acting as temporal decoupler with guaranteed –40°C to +85°C operation and robust flag signaling. Use Value: Maintains real-time determinism in PLC scan cycles despite variable sensor data arrival rates and environmental stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 72245L10PF | Same 4,096×18 organization and 10 ns speed grade, but commercial temperature range (0°C to +70°C) and Pb-free RoHS-compliant packaging. | Suitable for non-industrial environments where extended temperature operation is not required. | Select when RoHS compliance and commercial temp grade suffice; verify PCB layout compatibility due to identical pinout. |
| 72245LB15PFG | Slower 15 ns cycle time (66.7 MHz max), otherwise identical pinout, functionality, and industrial temperature rating. | Acceptable in lower-bandwidth systems where timing margin allows relaxed clock constraints. | Choose for cost-sensitive designs where 100 MHz operation is unnecessary; retains full drop-in compatibility except timing. |
Compared with 72245L10PF and 72245LB15PFG, the IDT72245LB10PFG uniquely combines industrial temperature range, SnPb lead finish (for legacy rework compatibility), and 10 ns performance - making it optimal for field-deployed equipment requiring long-term reliability under thermal stress.
Availability
IDT72245LB10PFG is available at Aetrix Electronics and suitable for optical disk controllers, LAN bridges, interprocessor communication links, and industrial PLC data exchange requiring stable component supply and long-lifecycle support.
Supply support for IDT72245LB10PFG 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.
IDT72245LB10PFG belongs to the SyncFIFO™ family designed specifically for low-latency, high-reliability data buffering in communications and industrial control systems demanding precise clock-domain isolation.
FAQ
What is the memory capacity and data width of the IDT72245LB10PFG?
The IDT72245LB10PFG provides 4,096 words of storage with an 18-bit data width, delivering 73,728 bits of total FIFO capacity. This configuration supports high-bandwidth applications such as LAN bridging and interprocessor messaging where wide parallel data paths reduce transaction overhead. The IDT72245LB10PFG maintains this exact specification across its industrial temperature range and 10 ns cycle time.
Does the IDT72245LB10PFG support asynchronous read and write clocks?
Yes, the IDT72245LB10PFG supports fully asynchronous operation between its write clock (WCLK) and read clock (RCLK), with specified skew tolerances (tSKEW1/tSKEW2 ≥5 ns). This allows independent clock domains - for example, connecting a 100 MHz processor bus to a 66.7 MHz peripheral interface - while preserving data integrity. The IDT72245LB10PFG also supports coincident clocking for single-clock system integration.
What are the default programmable flag offsets for the IDT72245LB10PFG?
The IDT72245LB10PFG defaults to 127-word offsets for both Programmable Almost-Empty (PAE) and Programmable Almost-Full (PAF) flags after reset - meaning PAE asserts when 127 words remain before empty, and PAF asserts when 127 words remain before full. These values are stored in 12-bit offset registers and can be reloaded via the LD pin and D0–D11 inputs. The IDT72245LB10PFG uses these same defaults regardless of operating temperature or supply voltage.
Can multiple IDT72245LB10PFG devices be connected for increased depth?
Yes, the IDT72245LB10PFG 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. The IDT72245LB10PFG propagates write/read completion pulses across the chain, enabling seamless extension beyond 4,096 words while maintaining flag synchronization and zero fall-through behavior across all devices.
What package type and lead finish does the IDT72245LB10PFG use?
The IDT72245LB10PFG is packaged in a 64-lead thin quad flatpack (TQFP-64) with SnPb (tin-lead) lead finish. This finish was designated end-of-life with last-time-buy expiring June 15, 2018, per official IDT documentation. The IDT72245LB10PFG remains suitable for legacy repair, industrial maintenance, and systems requiring backward-compatible soldering profiles.
72245LB10PFG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 7200
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Size:
- 72K (4K 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)
72245LB10PFG FAQ
1.How can I place an order for 72245LB10PFG through Aetrix?
Please submit a Request for Quotation (RFQ) for 72245LB10PFG 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 72245LB10PFG reliable?
The price and inventory of 72245LB10PFG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 72245LB10PFG is usually 5 days.
3.What payment methods are accepted for 72245LB10PFG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 72245LB10PFG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 72245LB10PFG?
72245LB10PFG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 72245LB10PFG 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 72245LB10PFG?
For technical support, including 72245LB10PFG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 72245LB10PFG requirements.
6.How does Aetrix verify that 72245LB10PFG is sourced from the original manufacturer or authorized distributors?
All 72245LB10PFG 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 72245LB10PFG meets industry standards.
7.What is the process for return or replacement of 72245LB10PFG?
All 72245LB10PFG units undergo pre-shipment inspection (PSI). If there is an issue with 72245LB10PFG, 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 72245LB10PFG part is unused and in its original packaging.
Return procedure for 72245LB10PFG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
72245LB10PFG 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…
