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Renesas 72255LA20TF
- Part No.:
- 72255LA20TF
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 64-LQFP
- Datasheet:
-
72255LA20TF.pdf
- Description:
- IC FIFO SYNC 8KX18 12NS 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,994
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Product details
Overview
IDT72255LA20TF from Integrated Device Technology is a high-speed, 8,192 × 18-bit synchronous CMOS FIFO memory with independent read/write clocks, 10 ns clock cycle time, fixed low-latency first-word access, and programmable Almost-Empty/Almost-Full flags - used in telecom data buffering and video frame synchronization.
For engineers reviewing the IDT72255LA20TF datasheet, IDT72255LA20TF pinout, IDT72255LA20TF application, or IDT72255LA20TF equivalent, key selection considerations include FWFT vs. IDT Standard timing mode configuration, 64-pin STQFP package compatibility, industrial temperature support (–40°C to +85°C), and retransmit functionality for packet replay in networking systems.
Technical Context
This FIFO eliminates frequency ratio constraints between RCLK and WCLK - both clocks operate fully independently from DC to 100 MHz. Its architecture features dual-register-buffered EF/FF in IDT Standard mode and triple-buffered OR/IR in FWFT mode, with deterministic latency of ≤12 ns for flag transitions and ≤10 ns for data access.
The device implements a dedicated offset register bank for PAE and PAF, supporting two default thresholds (127 or 1,023 words) selected at Master Reset via LD, and full user reprogramming via serial (26-bit) or parallel loading - enabling precise buffer-level signaling for real-time flow control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 8,192 × 18-bit - provides 147,456 bits of buffered storage for bursty data streams like Ethernet frames or video lines. |
| Clock Cycle Time | 20 ns - supports up to 50 MHz operation, verified across industrial temperature range (–40°C to +85°C). |
| Data Access Time | 12 ns - guarantees valid output within 12 ns after RCLK edge, critical for tight-timing synchronous interfaces. |
| First Word Latency | Fixed and short - eliminates variable-cycle counting delay; enables predictable pipeline alignment in FWFT mode. |
| Power Consumption | ICC1 ≤ 80 mA active / ICC2 ≤ 20 mA standby - auto power-down reduces idle current without external control. |
| Timing Modes | IDT Standard and First Word Fall Through (FWFT) - selected at Master Reset via FWFT/SI pin state. |
| Flag Programmability | PAE & PAF offsets configurable via serial (26-bit) or parallel load - supports custom flow-control thresholds per system requirement. |
Pinout & Package
Package: 64-pin Slim Thin Quad Flat Pack (STQFP), order code TF, 10 mm × 10 mm body, 0.5 mm pitch, lead-free (green) option available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D17 | Data Input Bus | 18-bit parallel input path; latched on rising WCLK when WEN = LOW. |
| Q0–Q17 | Data Output Bus | 18-bit tristatable output; enabled by OE, synchronized to RCLK/REN in IDT mode or RCLK-only in FWFT mode. |
| WCLK / RCLK | Independent Clock Inputs | No frequency dependency: both support DC–50 MHz operation with skew tolerance up to 25 ns (tSKEW4). |
| WEN / REN | Write/Read Enable Controls | Edge-triggered enable; REN ignored when FIFO is empty (EF = HIGH / OR = LOW). |
| FF/IR, EF/OR, HF, PAF, PAE | Status Flag Outputs | Five dedicated flags: FF/IR and EF/OR are mode-selectable; HF, PAF, PAE always active and programmable. |
| MRS / PRS / RT / FWFT/SI / LD / SEN / OE / DC | Control & Configuration Inputs | MRS resets pointers and configures mode/offset defaults; PRS retains settings; RT enables reread from start; LD selects serial/parallel programming; DC must be tied to VCC or GND. |
Key Features
| Feature | Design Value |
|---|---|
| Independent RCLK/WCLK operation | Removes prior frequency-ratio restrictions - simplifies clock domain bridging in mixed-rate systems like PCIe-to-ASIC interconnects. |
| Fixed first-word latency | Eliminates variable-cycle delay in prior SuperSync devices - ensures deterministic timing for real-time audio/video buffers. |
| Retransmit (RT) function | Resets read pointer to zero on rising RCLK without disturbing write pointer or flag settings - enables packet replay without FIFO flush. |
| Auto power-down | Reduces ICC2 to ≤20 mA during idle cycles - lowers thermal load in dense telecom line cards. |
| Two-mode timing selection | IDT Standard (EF/FF) for traditional request-driven access; FWFT (OR/IR) for immediate first-word availability - selectable per system need. |
Applications
| Telecom Data Buffering | Video Frame Synchronization |
|---|---|
Use Scenario: Absorbing jitter between OC-48 SONET framer and backplane switch ASIC with asynchronous clocks. IC Role / Device Role / Timing Role: Asynchronous FIFO bridge providing elastic storage with FWFT mode for immediate payload availability on link startup. Use Value: Eliminates frame loss during clock recovery lock-in by delivering first cell within 3 RCLK cycles, reducing sync acquisition time by >40%. | Use Scenario: Aligning HDMI source and display pixel clocks in broadcast-grade video scalers. IC Role / Device Role / Timing Role: Dual-clock depth buffer holding one full line (1,920 × 18-bit) while converting between 74.25 MHz and 148.5 MHz domains. Use Value: Enables seamless format conversion with <1-line latency using HF flag to trigger line-readout handoff. |
| Industrial Protocol Gateway | Network Packet Replay |
Use Scenario: Bridging Modbus RTU (9.6 kbps) and EtherCAT (100 Mbps) in PLC I/O modules. IC Role / Device Role / Timing Role: Rate-matching FIFO with programmable PAE/PAF thresholds to prevent overflow under bursty fieldbus traffic. Use Value: Configurable 127-word almost-empty threshold triggers early DMA refill, sustaining 99.99% uptime under 100% bus utilization. | Use Scenario: Replaying corrupted TCP segments in hardware-accelerated firewall appliances. IC Role / Device Role / Timing Role: Retransmit-capable FIFO storing up to 8K packets; RT pin initiates repeat read without CPU intervention. Use Value: Reduces replay latency to <200 ns (vs. software-based retransmit), cutting TCP retransmission timeout by 3×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72255LA20PF | Same electrical specs and pinout, but in 64-pin TQFP (PN64) instead of STQFP (PP64); 1.2 mm height vs. 1.0 mm. | TQFP variant better suited for through-hole prototyping or legacy board layouts; STQFP preferred for space-constrained telecom modules. | Select IDT72255LA20PF only if mechanical compatibility with existing TQFP footprints is required. |
| ON Semiconductor NB7L14M | Different architecture: 2K × 18-bit, 3.3V supply, LVDS I/O, no FWFT mode or retransmit; max fCLK = 800 MHz. | Targeted at ultra-high-speed SerDes buffering, not large-depth asynchronous bridging; lacks programmable flags and industrial temp grade. | Choose NB7L14M only for sub-ns jitter-critical 3.3V systems where depth < 2K suffices and FWFT is unnecessary. |
Compared with IDT72255LA20PF, the IDT72255LA20TF offers identical functionality in a thinner, surface-mount-optimized STQFP package - critical for modern 1RU telecom blades. Versus NB7L14M, it trades raw speed for deep buffering, deterministic latency, and industrial reliability - making it suitable for infrastructure-grade data flow control rather than high-frequency signal conditioning.
Availability
IDT72255LA20TF is available at Aetrix Electronics and suitable for telecom infrastructure, broadcast video equipment, and industrial protocol gateways requiring stable component supply, long-lifecycle support, and industrial temperature compliance.
Supply support for IDT72255LA20TF 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, designs high-performance timing, memory interface, and RF solutions for communications and computing markets.
The IDT72255LA family delivers deep, low-latency FIFOs optimized for asynchronous data bridging in telecom, video, and industrial networks - emphasizing deterministic timing, flexible flag control, and robust industrial operation.
FAQ
What is the maximum operating frequency of the IDT72255LA20TF?
The IDT72255LA20TF supports a maximum clock cycle time of 20 ns, corresponding to 50 MHz operation for both RCLK and WCLK. This rating is guaranteed across the full industrial temperature range (–40°C to +85°C) with VCC = 5.0 V ±10%. No frequency ratio constraint exists between the two clocks, allowing independent operation from DC to 50 MHz.
Does the IDT72255LA20TF support First Word Fall Through (FWFT) mode?
Yes, the IDT72255LA20TF supports FWFT mode. The timing mode is selected at Master Reset via the FWFT/SI pin: HIGH configures FWFT mode (enabling OR/IR flags and immediate first-word output after three RCLK edges), while LOW selects IDT Standard mode (requiring REN assertion for all reads). Both modes are fully supported and electrically characterized.
What package type is used for the IDT72255LA20TF?
The IDT72255LA20TF uses a 64-pin Slim Thin Quad Flat Pack (STQFP), order code TF, with 0.5 mm pitch and 10 mm × 10 mm body size. It is mechanically and electrically pin-compatible with the TQFP variant (IDT72255LA20PF), differing only in profile height (1.0 mm vs. 1.2 mm) and moisture sensitivity level.
How is the programmable Almost-Empty (PAE) flag configured on the IDT72255LA20TF?
The PAE flag offset is configured via internal 18-bit registers loaded either serially (26-bit sequence via SI pin) or in parallel (via D0–D17). Default values (127 or 1,023 words) are set at Master Reset based on LD pin state. Reprogramming is allowed anytime post-reset, and current values can be read back in parallel via Q0–Q17.
Is the IDT72255LA20TF qualified for industrial temperature operation?
Yes, the IDT72255LA20TF is explicitly rated for industrial temperature operation from –40°C to +85°C, as confirmed in the datasheet's Recommended Operating Conditions and AC Electrical Characteristics tables. This rating applies to all speed grades including the 20 ns variant, and includes full characterization of tA, tCLK, ICC1, and flag timing across the range.
72255LA20TF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 7200
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 144K (8K x 18)
- Function:
- Synchronous
- Data Rate:
- 50MHz
- Access Time:
- 12ns
- Voltage - Supply:
- 4 V ~ 5.5 V
- Current - Supply (Max):
- 80mA
- Bus Directional:
- Uni-Directional
- Expansion Type:
- Depth, Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- Yes
- FWFT Support:
- Yes
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
72255LA20TF FAQ
1.How can I place an order for 72255LA20TF through Aetrix?
Please submit a Request for Quotation (RFQ) for 72255LA20TF 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 72255LA20TF reliable?
The price and inventory of 72255LA20TF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 72255LA20TF is usually 5 days.
3.What payment methods are accepted for 72255LA20TF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 72255LA20TF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 72255LA20TF?
72255LA20TF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 72255LA20TF 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 72255LA20TF?
For technical support, including 72255LA20TF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 72255LA20TF requirements.
6.How does Aetrix verify that 72255LA20TF is sourced from the original manufacturer or authorized distributors?
All 72255LA20TF 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 72255LA20TF meets industry standards.
7.What is the process for return or replacement of 72255LA20TF?
All 72255LA20TF units undergo pre-shipment inspection (PSI). If there is an issue with 72255LA20TF, 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 72255LA20TF part is unused and in its original packaging.
Return procedure for 72255LA20TF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
72255LA20TF Tags
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