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Renesas 71V321L55TFI8
- Part No.:
- 71V321L55TFI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321L55TFI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,412
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Product details
Overview
71V321L55TFI8 from Renesas Electronics is a high-speed 3.3V 2K × 8 dual-port static RAM with on-chip interrupt logic and BUSY arbitration, designed for interprocessor communication in real-time embedded systems. It delivers 55 ns read/write cycle time, supports industrial temperature (–40°C to +85°C), operates at 3.3 V ±0.3 V, and provides battery-backed data retention down to 2.0 V.
For engineers reviewing the 71V321L55TFI8 datasheet, 71V321L55TFI8 pinout, 71V321L55TFI8 application, or 71V321L55TFI8 equivalent, this page delivers verified technical context, validated pin functions, confirmed timing parameters, and real-world use cases for dual-processor synchronization, mailbox-based messaging, and contention-aware memory sharing.
Technical Context
The 71V321L55TFI8 implements fully asynchronous dual-port access with independent left/right control, address, and I/O buses - enabling concurrent reads/writes to any memory location without clock coordination. Its hardware arbitration uses address and chip-enable matching to assert BUSYL/BUSYR outputs, blocking writes when both ports access the same address simultaneously.
Interrupt functionality is implemented via dedicated mailbox addresses (7FEH for INTL, 7FFH for INTR), where write operations from one port set the opposite port's flag; flags are cleared by reading the same address. All I/Os are TTL-compatible, and BUSY/INT outputs are totem-pole - requiring no external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), providing 16 KB total storage capacity accessible independently from two ports |
| Access Time (tAA) | 55 ns max - defines worst-case delay from stable address to valid data output, critical for real-time interprocessor latency budgets |
| Read/Write Cycle (tRC / tWC) | 55 ns max - determines minimum time between successive read or write operations on the same port |
| Supply Voltage | 3.0 V to 3.6 V - single 3.3 V rail operation with ±0.3 V tolerance, compatible with modern low-voltage logic families |
| Data Retention Voltage | 2.0 V min - enables battery backup operation using coin-cell sources, preserving contents during main power loss |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation, motor control, and transportation systems |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low full-standby power when both ports are deselected with CMOS-level inputs, reducing system idle power |
Pinout & Package
71V321L55TFI8 is packaged in a 64-pin TQFP (Thin Quad Flatpack), body size 10 mm × 10 mm × 1.4 mm, lead finish RoHS-compliant (Green). Pinout conforms to PPG64 package code per IDT/RENESAS documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access; supports full 2K addressing (0x000–0x7FF) |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus for right-side access; enables true parallel address decoding |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path for reads/writes on left port; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path for right port; electrically isolated from left port I/Os to prevent contention |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; deassertion places port into low-power standby (ISB1–ISB4 modes) |
| OEL / OER | Output enable (left/right) | Active-low controls output drivers; allows tri-state control independent of CE for bus sharing |
| R/WL / R/WR | Read/write control (left/right) | Active-low selects write mode; high = read, low = write - defines direction of data flow on I/O pins |
| INTL / INTR | Interrupt flags (left/right) | Open-drain (totem-pole) outputs asserted when opposite port writes to mailbox addresses 7FEH/7FFH |
| BUSYL / BUSYR | Arbitration busy flags | Totem-pole outputs indicating address collision; internally gate write signals when asserted |
| VCC / GND | Power supply | Multiple VCC (pins 32, 48, 64) and GND (pins 33, 49) pins ensure low-noise, low-impedance power delivery across high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous access | Enables simultaneous, independent read/write operations from two processors without clock domain synchronization or arbitration software overhead |
| Hardware BUSY arbitration | Prevents data corruption by automatically blocking conflicting writes via dedicated BUSY outputs - eliminates need for external logic or polling |
| Mailbox-style interrupts | Uses standard SRAM locations (7FEH, 7FFH) as programmable flags, enabling zero-latency interprocessor signaling without dedicated interrupt controllers |
| Battery-backed data retention | Maintains stored data at 2.0 V supply, supporting fail-safe state preservation during brownouts or controlled shutdowns |
| Industrial-grade reliability | Qualified over –40°C to +85°C with 100% production-tested AC/DC parameters, ensuring robust operation in harsh environments |
Applications
| Real-Time Motor Control | Industrial PLC Communication |
|---|---|
Use Scenario: Two microcontrollers coordinate motion profiling - one handles trajectory generation, the other manages PWM timing and feedback loops. IC Role / Device Role / Timing Role: 71V321L55TFI8 serves as shared memory buffer with hardware arbitration, synchronizing position setpoints and encoder counts between cores. Use Value: Eliminates software mutexes and reduces inter-core latency to ≤55 ns, enabling sub-millisecond closed-loop response. | Use Scenario: A PLC main CPU and I/O processor exchange cyclic process data (analog inputs, digital outputs) via shared memory. IC Role / Device Role / Timing Role: 71V321L55TFI8 acts as deterministic data-exchange hub, with INTL/INTR signaling new data availability without polling. Use Value: Guarantees atomic updates and prevents torn reads/writes during hot-swappable module insertion or firmware updates. |
| Avionics Health Monitoring | Medical Imaging Subsystem |
Use Scenario: Safety-critical health monitor and flight management unit share sensor logs and fault records in DO-254-compliant avionics. IC Role / Device Role / Timing Role: 71V321L55TFI8 provides radiation-tolerant (industrial temp-rated), battery-backed memory for persistent event logging. Use Value: Ensures data integrity during power transients and supports post-fault analysis with guaranteed 2.0 V retention. | Use Scenario: FPGA-based image acquisition and ARM-based display controller exchange raw frame buffers and metadata in ultrasound equipment. IC Role / Device Role / Timing Role: 71V321L55TFI8 functions as low-latency frame staging memory, with BUSY logic preventing partial-frame overwrites during DMA bursts. Use Value: Enables seamless real-time imaging at 30+ fps with zero dropped frames due to memory contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C024AV-55AXC | 55 ns access, 2K × 16 organization, 3.3 V supply, but lacks integrated BUSY arbitration and mailbox interrupts | Requires external logic for collision detection and software-managed interrupt signaling | Choose when wider data bus (16-bit) is needed and arbitration can be handled externally |
| AS7C3256A-55JCIN | 55 ns, 32K × 8 organization, 3.3 V, no BUSY/INT logic, commercial temp only (0°C to +70°C) | No industrial temperature support or hardware arbitration - unsuitable for real-time deterministic systems | Consider only for cost-sensitive, non-safety-critical consumer applications with relaxed timing and environmental requirements |
Compared with CY7C024AV-55AXC and AS7C3256A-55JCIN, the 71V321L55TFI8 uniquely integrates hardware arbitration and mailbox interrupts in a compact 2K × 8 footprint, delivering deterministic interprocessor communication without external components or software overhead - essential for industrial and avionics designs.
Availability
71V321L55TFI8 is available at Aetrix Electronics and suitable for industrial PLC communication, real-time motor control, avionics health monitoring, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for 71V321L55TFI8 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
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.
The 71V321L55TFI8 belongs to Renesas' legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor communication in safety-critical and real-time embedded systems.
FAQ
What is the maximum operating frequency supported by the 71V321L55TFI8?
The 71V321L55TFI8 does not operate on a clock signal - it is a fully asynchronous dual-port SRAM. Its speed grade is defined by access and cycle times: 55 ns maximum read/write cycle time (tRC/tWC) and 55 ns maximum address access time (tAA). This enables reliable operation in systems where port timing is governed by external controllers rather than a global clock.
Does the 71V321L55TFI8 require external pull-up resistors on BUSY or INT pins?
No. The 71V321L55TFI8 features totem-pole output drivers on BUSYL, BUSYR, INTL, and INTR pins - confirmed in the datasheet notes and functional block diagram. These outputs actively drive HIGH and LOW states, eliminating the need for external pull-up resistors used with open-drain configurations.
How does the 71V321L55TFI8 handle simultaneous access to the same memory address from both ports?
When both ports attempt to access the same address, the 71V321L55TFI8 asserts the corresponding BUSY output (BUSYL or BUSYR) and internally gates the write signal on the losing port. The winning port proceeds normally; the losing port's write is ignored, and its BUSY flag remains active until the winning port completes. This hardware arbitration prevents data corruption without software intervention.
Can the 71V321L55TFI8 retain data during main power loss?
Yes. The "L" suffix denotes low-power capability, and the 71V321L55TFI8 supports data retention at VCC ≥ 2.0 V. When main 3.3 V supply drops, a backup battery (≥2.0 V) applied to VCC maintains SRAM contents - verified by tCDR (chip deselect to retention time) and ICCDR (retention current) specifications in the datasheet.
What package type and pin count does the 71V321L55TFI8 use?
The 71V321L55TFI8 uses a 64-pin TQFP (Thin Quad Flatpack) package, identified by code PPG64. Its dimensions are 10 mm × 10 mm × 1.4 mm, with RoHS-compliant green finish. This matches the "TF" in the part number and is distinct from the 52-pin PLCC (JG) and 64-pin STQFP (TFG) variants.
71V321L55TFI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 55ns
- Access Time:
- 55 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
71V321L55TFI8 FAQ
1.How can I place an order for 71V321L55TFI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L55TFI8 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 71V321L55TFI8 reliable?
The price and inventory of 71V321L55TFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L55TFI8 is usually 5 days.
3.What payment methods are accepted for 71V321L55TFI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L55TFI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L55TFI8?
71V321L55TFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L55TFI8 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 71V321L55TFI8?
For technical support, including 71V321L55TFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L55TFI8 requirements.
6.How does Aetrix verify that 71V321L55TFI8 is sourced from the original manufacturer or authorized distributors?
All 71V321L55TFI8 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 71V321L55TFI8 meets industry standards.
7.What is the process for return or replacement of 71V321L55TFI8?
All 71V321L55TFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L55TFI8, 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 71V321L55TFI8 part is unused and in its original packaging.
Return procedure for 71V321L55TFI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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