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Renesas 72255LA20PF
- Part No.:
- 72255LA20PF
- Manufacturer:
- Renesas
- Category:
- FIFOs Memory
- Package:
- 64-LQFP
- Datasheet:
-
72255LA20PF.pdf
- Description:
- IC FIFO SYNC 8KX18 12NS 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,290
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Product details
Overview
IDT72255LA20PF from Integrated Device Technology (IDT) 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 - deployed in telecom line cards for buffering packetized voice data between mismatched DSP and serial interface domains.
For engineers reviewing the IDT72255LA20PF datasheet, IDT72255LA20PF pinout, IDT72255LA20PF application, or IDT72255LA20PF equivalent, key selection considerations include FWFT vs. IDT Standard timing mode configuration, 64-pin TQFP package compatibility, industrial temperature support (–40°C to +85°C), and retransmit functionality for protocol retry handling.
Technical Context
This FIFO implements dual-clock architecture with fully asynchronous RCLK and WCLK inputs-no frequency ratio constraints, eliminating the FS pin used in prior SuperSync generations. Its internal RAM array feeds into separate input and output registers, enabling simultaneous read/write operations without arbitration logic.
The device supports two distinct timing modes selected at Master Reset: IDT Standard mode (EF/FF flag behavior, REN-required first-word access) and First Word Fall Through (FWFT) mode (OR/IR flags, automatic first-word output after three RCLK edges). Flag logic includes hardware-programmable offsets loaded via parallel (D0–D17) or serial (SI) paths using LD/SEN/WEN control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width | 8,192 × 18 bits - provides 147,456-bit buffer capacity for burst-mode data alignment across clock domains. |
| Clock Cycle Time | 10 ns - enables 100 MHz maximum clock frequency for high-throughput streaming applications. |
| Data Access Time | 8 ns - guarantees deterministic latency from write to valid read output under worst-case conditions. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems requiring thermal robustness. |
| Supply Voltage | 5.0 V ±10% - compatible with legacy 5V TTL/CMOS logic families and mixed-voltage board designs. |
| Power Consumption | 80 mA active / 20 mA standby - auto power-down reduces idle current by 75% during FIFO inactivity. |
| Flag Outputs | EF/OR, FF/IR, HF, PAE, PAF - five status signals with user-defined thresholds support precise buffer management without external logic. |
Pinout & Package
Package: 64-pin Thin Quad Flat Pack (TQFP), order code PF - RoHS-compliant lead-free finish, 10 mm × 10 mm body, 0.5 mm pitch, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D17 | Data Inputs | 18-bit parallel write bus; accepts data on rising WCLK when WEN = LOW. |
| Q0–Q17 | Data Outputs | 18-bit parallel read bus; outputs driven only when OE = LOW and REN = LOW (IDT mode) or OR = HIGH (FWFT mode). |
| WCLK / RCLK | Independent Clock Inputs | Asynchronous write/read clocks; no frequency relationship required - eliminates clock domain crossing constraints. |
| WEN / REN | Write/Read Enable Controls | Edge-triggered enables; WEN gates writes, REN gates reads (except first word in FWFT mode). |
| OE | Output Enable | Three-state control of Q0–Q17; asserts high-impedance state when OE = HIGH. |
| MRS / PRS | Master/Partial Reset | MRS clears pointers and flags; PRS resets pointers only - preserves programmable flag settings during runtime recovery. |
| RT | Retransmit Control | Asserted on rising RCLK edge to reset read pointer to zero - enables repeat reads without data loss or external counter. |
| FWFT/SI | Mode Select / Serial Input | LOW at MRS selects IDT Standard mode; HIGH selects FWFT mode; post-reset functions as serial programming input. |
| LD / SEN | Load / Serial Enable | LD selects parallel vs. serial offset programming during MRS; SEN enables serial bitstream loading on WCLK edges. |
| PAE / PAF / EF/OR / FF/IR / HF | Status Flag Outputs | Programmable threshold flags signal buffer occupancy; EF/OR and FF/IR are mode-selectable; HF is always active. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed first-word latency | Eliminates variable-cycle delay in prior FIFOs - ensures predictable 3-RCLK (FWFT) or 1-REN+1-RCLK (IDT) access timing. |
| Retransmit operation | Hardware-initiated read pointer reset via RT pin - avoids software overhead in error-recovery protocols like HDLC or ATM cell retransmission. |
| Auto power-down | Zero-activity detection reduces ICC2 to 20 mA - cuts standby power by >75% versus always-on FIFOs in intermittent-data systems. |
| Programmable flag offsets | PAE/PAF thresholds set to 127 or 1,023 words via LD pin at reset, or reprogrammed serially/parallel - enables adaptive flow control without FPGA logic. |
| Depth expansion support | FWFT mode allows cascading multiple IDT72255LA20PF units in series using Q→D interconnect - scales buffer depth without glue logic or address translation. |
Applications
| Telecom Line Card Buffering | Industrial Protocol Gateway |
|---|---|
Use Scenario: Synchronizing TDM voice streams between a 125 MHz DSP and a 2.048 MHz E1 framer IC. IC Role / Device Role / Timing Role: Asynchronous data bridge with independent RCLK/WCLK domains; absorbs jitter and rate mismatches via 8K-word depth. Use Value: Eliminates packet loss during clock drift events; FWFT mode delivers immediate first-sample availability for real-time echo cancellation. |
Use Scenario: Converting Modbus RTU frames from RS-485 to Ethernet TCP packets in a factory-floor gateway. IC Role / Device Role / Timing Role: Dual-port FIFO buffers serial receive data until TCP stack is ready; handles variable-length frame bursts up to 256 bytes. Use Value: Prevents UART overrun errors during network congestion; programmable PAF triggers DMA fetch before FIFO overflows. |
| Video Frame Synchronization | Test Equipment Data Capture |
Use Scenario: Aligning 1080p video pixel data from a 74.25 MHz HDMI receiver to a 148.5 MHz display controller. IC Role / Device Role / Timing Role: Pixel-domain FIFO with 18-bit wide bus; manages horizontal blanking interval timing skew between source and sink. Use Value: Maintains frame integrity across clock domains; HF flag triggers line-buffer flush to prevent vertical tearing artifacts. |
Use Scenario: Capturing high-speed digital stimulus-response sequences in automated test equipment (ATE) with 100 MHz sampling. IC Role / Device Role / Timing Role: High-bandwidth capture buffer accepting parallel test vectors; decouples pattern generator clock from analysis subsystem. Use Value: Enables continuous 1.5 Msample capture at full speed; retransmit (RT) allows repeated waveform playback without reloading memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FIFO memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72255LA15PF | 15 ns clock cycle (66.7 MHz max), higher access time (10 ns), same 8K×18 organization and pinout. | Suitable where lower throughput suffices and cost sensitivity favors slower speed grade. | Select when system clock budget permits relaxed timing margins and BOM cost optimization is prioritized. |
| ON Semiconductor NB7L14M | 8K×18, 2.5V supply, LVDS I/O, 2.5 Gbps serial interface - not pin-compatible; requires level-shifting and layout redesign. | Targets high-speed serial backplanes rather than parallel-bus buffering; lacks FWFT mode and retransmit. | Consider only for new 2.5V/LVDS designs requiring differential signaling; not a drop-in replacement. |
Compared with IDT72255LA20PF, the IDT72255LA15PF trades 100 MHz performance for lower cost and power, while the NB7L14M shifts to serial architecture with incompatible voltage and interface requirements - making IDT72255LA20PF the sole option for existing 5V parallel-bus, FWFT-enabled, industrial-temperature designs.
Availability
IDT72255LA20PF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial protocol gateways, video synchronization, and automated test equipment requiring stable component supply across extended product lifecycles.
Supply support for IDT72255LA20PF 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance FIFO solutions before its acquisition by Renesas Electronics in 2019.
IDT72255LA20PF belongs to the SuperSync FIFO family - designed specifically for high-reliability, multi-clock-domain buffering in networking, telecom, and industrial control systems where deterministic latency and flexible flag management are critical.
FAQ
What is the maximum operating frequency of the IDT72255LA20PF?
The IDT72255LA20PF supports a maximum clock cycle time of 10 ns, corresponding to a 100 MHz clock frequency for both RCLK and WCLK inputs. This specification is guaranteed across the industrial temperature range (–40°C to +85°C) with VCC = 5.0 V ±10%, per AC Electrical Characteristics Table on page 6 of the datasheet.
Does the IDT72255LA20PF support both IDT Standard and First Word Fall Through (FWFT) timing modes?
Yes, the IDT72255LA20PF supports both timing modes. The mode is selected during Master Reset (MRS) based on the logic level of the FWFT/SI pin: LOW configures IDT Standard mode (EF/FF flags, REN-required reads), HIGH configures FWFT mode (OR/IR flags, automatic first-word output). Both modes are fully supported in the same silicon.
How is the programmable Almost-Empty (PAE) flag threshold configured on the IDT72255LA20PF?
The PAE threshold is set via the Empty Offset register. At Master Reset, LD = LOW selects 127-word default offset with parallel programming; LD = HIGH selects 1,023-word default with serial programming. Offsets can be reloaded post-reset using D0–D17 (parallel) or SI (serial) with LD/SEN/WEN control, as detailed in Figures 3–4 and Tables 1–2.
Can the IDT72255LA20PF be used in industrial temperature applications?
Yes, the IDT72255LA20PF is explicitly qualified for industrial temperature operation from –40°C to +85°C, as stated in the "Commercial and Industrial Temperature Ranges" header and confirmed in the Recommended DC Operating Conditions table (page 5). It meets all AC/DC specifications across this range with VCC = 5.0 V ±10%.
What package type is used for the IDT72255LA20PF?
The IDT72255LA20PF uses a 64-pin Thin Quad Flat Pack (TQFP) with order code PF, as specified in the Pin Configurations section (page 2) and ordering information. It features 0.5 mm pitch, 10 mm × 10 mm body, and lead-free (RoHS-compliant) finish - distinct from the STQFP (TF) variant.
72255LA20PF 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 (14x14)
72255LA20PF FAQ
1.How can I place an order for 72255LA20PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 72255LA20PF 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 72255LA20PF reliable?
The price and inventory of 72255LA20PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 72255LA20PF is usually 5 days.
3.What payment methods are accepted for 72255LA20PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 72255LA20PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 72255LA20PF?
72255LA20PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 72255LA20PF 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 72255LA20PF?
For technical support, including 72255LA20PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 72255LA20PF requirements.
6.How does Aetrix verify that 72255LA20PF is sourced from the original manufacturer or authorized distributors?
All 72255LA20PF 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 72255LA20PF meets industry standards.
7.What is the process for return or replacement of 72255LA20PF?
All 72255LA20PF units undergo pre-shipment inspection (PSI). If there is an issue with 72255LA20PF, 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 72255LA20PF part is unused and in its original packaging.
Return procedure for 72255LA20PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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