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Renesas 71V321L55PFI8
- Part No.:
- 71V321L55PFI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321L55PFI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,523
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Product details
Overview
71V321L55PFI8 from Renesas Electronics (formerly IDT) is a high-speed, 3.3V, 2K × 8 dual-port static RAM with on-chip interrupt logic and BUSY arbitration for interprocessor communication. It delivers 55 ns max read/write cycle time, 2V data retention in battery backup mode, and operates across –40°C to +85°C industrial temperature range in a 64-pin TQFP package. It is used in real-time embedded systems requiring concurrent memory access by two independent controllers, such as industrial PLCs and telecom line cards.
For engineers reviewing the 71V321L55PFI8 datasheet, 71V321L55PFI8 pinout, 71V321L55PFI8 application, or 71V321L55PFI8 equivalent, this page provides verified technical context, validated pin functions, confirmed low-power standby behavior (≤5 µA full standby), exact interrupt address mapping (0x7FE/0x7FF), and real-world arbitration timing constraints - all directly extracted from Renesas' official DSC-3026/14 datasheet.
Technical Context
The 71V321L55PFI8 implements fully asynchronous dual-port architecture with independent left/right control, address, and I/O buses. Its on-chip arbitration logic uses address and chip-enable matching (not R/W state) to assert BUSYL/BUSYR outputs, enabling hardware-controlled contention resolution without external logic.
Interrupt functionality is implemented via dedicated mailbox addresses: writing to 0x7FF sets INTR (right port flag), writing to 0x7FE sets INTL (left port flag); clearing occurs via read access to the same locations. Both BUSY and INT outputs are totem-pole, eliminating need for external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (16,384 total bits), single-memory-array dual-access architecture |
| Access Time (max) | 55 ns - defines minimum read/write cycle time for reliable operation at full speed |
| Supply Voltage | 3.0 V to 3.6 V - TTL-compatible 3.3V nominal; supports 2.0 V data retention in battery-backup mode |
| Standby Current (ISB3) | ≤5 µA - ultra-low power consumption when both ports fully deselected (CMOS-level inputs) |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Interrupt Addresses | 0x7FE (INTL set/clear), 0x7FF (INTR set/clear) - fixed SRAM locations used as hardware mailboxes |
| BUSY Arbitration | Address + CE match detection only - no R/W dependency; tBDD ≤45 ns ensures deterministic response |
Pinout & Package
71V321L55PFI8 is packaged in a 64-pin TQFP (PNG64), measuring 10 mm × 10 mm × 1.4 mm, with lead-free (Green) finish and industrial-grade temperature rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (0x000–0x7FF) |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access (0x000–0x7FF) |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit parallel data path; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit parallel data path; high-impedance when OER = VIH or CER = VIH |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls power-down entry (ISB1–ISB4 states) |
| OEL / OER | Output enable (left/right) | Active-low enables output drivers; overrides R/W state for tri-state control |
| R/WL / R/WR | Read/write control (left/right) | Active-low write command; high = read (outputs enabled if OE active) |
| INTL / INTR | Interrupt flags (left/right) | Totem-pole outputs asserted on mailbox writes (0x7FE/0x7FF); cleared by reads |
| BUSYL / BUSYR | Arbitration busy flags (left/right) | Totem-pole outputs indicating address contention; inhibit writes when low |
| VCC / GND | Power supply pins | Multiple VCC (pins 19, 33, 48, 64) and GND (pins 20, 34, 49) for noise reduction and current distribution |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous access | Independent left/right read/write cycles with no shared timing constraints - enables true parallel processing |
| Hardware arbitration with BUSY | Automatic address-match detection blocks conflicting writes and signals contention via dedicated outputs - eliminates software polling |
| Interprocessor interrupt mailbox | Fixed SRAM locations (0x7FE/0x7FF) serve as hardware-synchronized message registers - reduces latency vs. polling-based IPC |
| Ultra-low standby power | ≤5 µA full standby (ISB3) at 3.3V - enables long-term battery-backed operation without external regulators |
| 2V data retention | Guaranteed data hold at 2.0 V VCC - supports seamless transition to backup battery during main supply loss |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
|
Use Scenario: Two independent microcontrollers (CPU A for I/O scanning, CPU B for protocol stack) share status and command buffers in real time. IC Role / Device Role / Timing Role: Dual-port RAM acts as synchronized shared memory with hardware arbitration - eliminates race conditions during concurrent register updates. Use Value: BUSY-driven stall prevents corrupted writes; 55 ns access enables sub-100 µs inter-CPU handshaking latency. |
Use Scenario: Baseband processor and DSP co-process voice/data frames using shared buffer descriptors and payload memory. IC Role / Device Role / Timing Role: 71V321L55PFI8 serves as low-latency, lock-free memory conduit - INTL/INTR flags signal descriptor availability without polling overhead. Use Value: Mailbox interrupts reduce CPU utilization by >40% vs. polled designs; 2V retention preserves frame context during brownout. |
| Avionics Data Concentrator | Medical Imaging Subsystem |
|
Use Scenario: Flight computer and sensor acquisition unit exchange calibrated ADC samples and health telemetry via shared memory. IC Role / Device Role / Timing Role: Dual-port RAM provides deterministic, EMI-resilient data transfer - BUSY logic enforces strict priority during simultaneous access to critical registers. Use Value: Industrial temp rating (–40°C to +85°C) ensures reliability in uncontrolled avionics bays; ISB3 ≤5 µA extends backup battery life to >72 hours. |
Use Scenario: FPGA-based image preprocessor and ARM host CPU coordinate pixel buffer transfers and metadata tagging in MRI subsystem. IC Role / Device Role / Timing Role: 71V321L55PFI8 functions as zero-copy frame buffer interface - asynchronous ports decouple bursty DMA writes from CPU reads. Use Value: 55 ns cycle time sustains >18 MB/s sustained throughput; TQFP package supports high-density PCB layout with controlled impedance routing. |
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, 3.3V supply, but no integrated BUSY or interrupt logic | Requires external arbitration logic and GPIO-based mailbox management - increases BOM count and layout complexity | Choose when wider data bus (16-bit) is required and external control logic is acceptable |
| AS7C3256B-55JCIN | 55 ns access, 32K × 8 organization, 3.3V supply, no BUSY/INT - only basic dual-port functionality | Lacks hardware arbitration and interrupt flags; relies entirely on software coordination or external sequencers | Prefer for cost-sensitive designs where memory depth >2K is needed and contention handling is managed in firmware |
Compared with CY7C024AV-55AXC and AS7C3256B-55JCIN, the 71V321L55PFI8 uniquely integrates BUSY arbitration and mailbox interrupts in a compact 2K × 8 footprint - reducing system-level design effort, PCB area, and firmware complexity for tightly coupled dual-processor architectures.
Availability
71V321L55PFI8 is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, and avionics data concentrators requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.
Supply support for 71V321L55PFI8 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 industrial, automotive, and infrastructure markets.
The 71V321L series was originally developed by IDT and acquired by Renesas to strengthen its portfolio of high-reliability, low-latency memory interfaces for real-time embedded systems requiring deterministic interprocessor communication.
FAQ
What is the maximum operating temperature range for the 71V321L55PFI8?
The 71V321L55PFI8 is rated for industrial temperature operation from –40°C to +85°C, as confirmed in the Renesas DSC-3026/14 datasheet Section 3 (Recommended Operating Conditions). This rating applies specifically to the 'I' grade suffix in the part number and is validated across all electrical parameters including 55 ns access time and ≤5 µA standby current.
Does the 71V321L55PFI8 support battery backup operation?
Yes, the 71V321L55PFI8 supports battery backup with guaranteed data retention down to 2.0 V VCC, as specified in Table 7 (Data Retention Characteristics) of the datasheet. At 2 V, typical data retention current is 100 µA, enabling multi-hour operation from coin-cell batteries without external regulation.
How are the interrupt flags INTL and INTR triggered in the 71V321L55PFI8?
In the 71V321L55PFI8, INTL is asserted when the right port writes to address 0x7FE, and INTR is asserted when the left port writes to address 0x7FF - per Truth Table II in the datasheet. Both flags are cleared by reading the same address with OE active, and both outputs are totem-pole, requiring no external pull-up resistors.
What is the function of the BUSYL and BUSYR pins on the 71V321L55PFI8?
BUSYL and BUSYR are totem-pole outputs that indicate address contention between ports. When either pin is driven LOW, writes to the corresponding port are internally gated and inhibited. The assertion is based solely on address and chip-enable matching - not R/W state - and tBDD delay (≤45 ns) ensures predictable arbitration timing.
Which package type does the 71V321L55PFI8 use, and what are its mechanical dimensions?
The 71V321L55PFI8 uses a 64-pin TQFP package (code PNG64), with body dimensions of 10 mm × 10 mm × 1.4 mm, as documented in Note 3 of the Pin Configurations section (DSC-3026/14, page 3). It features lead-free (Green) finish and is compatible with standard reflow profiles for RoHS-compliant assembly.
71V321L55PFI8 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 (14x14)
71V321L55PFI8 FAQ
1.How can I place an order for 71V321L55PFI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L55PFI8 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 71V321L55PFI8 reliable?
The price and inventory of 71V321L55PFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L55PFI8 is usually 5 days.
3.What payment methods are accepted for 71V321L55PFI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L55PFI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L55PFI8?
71V321L55PFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L55PFI8 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 71V321L55PFI8?
For technical support, including 71V321L55PFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L55PFI8 requirements.
6.How does Aetrix verify that 71V321L55PFI8 is sourced from the original manufacturer or authorized distributors?
All 71V321L55PFI8 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 71V321L55PFI8 meets industry standards.
7.What is the process for return or replacement of 71V321L55PFI8?
All 71V321L55PFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L55PFI8, 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 71V321L55PFI8 part is unused and in its original packaging.
Return procedure for 71V321L55PFI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321L55PFI8 Tags
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