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Renesas 71V321L35PFGI8
- Part No.:
- 71V321L35PFGI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321L35PFGI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,498
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Product details
Overview
71V321L35PFGI8 from Renesas Electronics (formerly IDT) is a high-speed, low-power 2K × 8 dual-port static RAM with independent left/right ports, on-chip interrupt logic, and BUSY arbitration. It operates at 3.3 V, delivers 35 ns max access time, supports industrial temperature (–40°C to +85°C), and enables battery-backed data retention down to 2 V. It is used in real-time interprocessor communication systems requiring concurrent read/write access without software coordination.
For engineers reviewing the 71V321L35PFGI8 datasheet, 71V321L35PFGI8 pinout, 71V321L35PFGI8 application, or 71V321L35PFGI8 equivalent, key selection criteria include dual-port asynchronous timing, interrupt mailbox addressing (7FEh/7FFh), BUSY-driven contention resolution, 64-pin TQFP package compatibility, and industrial-grade power-down current (≤35 mA active, ≤6 µA full standby).
Technical Context
The 71V321L35PFGI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling simultaneous, independent access to any memory location. Its arbitration logic uses chip enable (CE) and address match detection-not R/W state-to assert BUSYL/BUSYR outputs, preventing conflicting writes without external logic.
Interrupt functionality relies on dedicated mailbox addresses: writing to 7FFh via the left port sets INTR (right port flag), while writing to 7FEh via the right port sets INTL (left port flag); clearing is performed by reading those same addresses with OE and CE asserted. All interrupt and BUSY timing parameters-including tINS/tINR (≤25 ns) and tBDD (≤30 ns)-are specified for industrial temperature and 3.3 V operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), 16 KB total capacity, non-multiplexed dual-port layout |
| Access Time (max) | 35 ns - guarantees worst-case read/write cycle completion under industrial conditions (–40°C to +85°C, VCC = 3.3 V ± 0.3 V) |
| Supply Voltage | 3.0 V to 3.6 V - TTL-compatible 3.3 V nominal operation; supports 2.0 V data retention in battery backup mode |
| Active Current (typ) | 55 mA - measured with both ports active at fMAX, enabling predictable thermal design in dense embedded systems |
| Full Standby Current (typ) | 0.2 µA - achieved when both ports' CE inputs are held > VCC − 0.2 V and all inputs are CMOS-level stable |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating or external thermal management |
| Interrupt Latency | tINS ≤ 25 ns - maximum delay from write to interrupt flag assertion, critical for deterministic inter-processor signaling |
Pinout & Package
71V321L35PFGI8 is packaged in a 64-pin TQFP (Thin Quad Flat Pack), code PNG64, body size 10 mm × 10 mm × 1.4 mm, lead-free (Green) compliant, with exposed pad for thermal dissipation. Pin 1 marked via corner notch; all VCC pins require local decoupling, all GND pins must be connected to system ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access; latched on CE or R/W transition |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus; no shared lines with left port-enables true parallel addressing |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit tri-state I/O; direction controlled by R/WL and OEL; high-impedance when deselected |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated from left port I/O; supports simultaneous read/write on same address only with BUSY arbitration |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; drives internal power-down when high, reducing ISB to ≤0.2 µA |
| OEL / OER | Output enable (left/right) | Active-low controls output drivers; allows high-Z state during bus sharing or contention |
| R/WL / R/WR | Read/write control (left/right) | Active-low write command; read occurs when R/W = high and OE = low; no internal latching |
| INTL / INTR | Interrupt flags (left/right) | Totem-pole outputs; asserted low upon mailbox write (7FEh/7FFh); cleared by reading same address |
| BUSYL / BUSYR | Arbitration status (left/right) | Totem-pole outputs; go low when opposite port accesses same address-gates write internally |
| VCC / GND | Power supply | Four VCC and four GND pins distributed across package corners-mandatory for noise immunity and thermal stability |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous access | Enables real-time co-processing without clock synchronization-critical for DSP+FPGA or dual-CPU architectures |
| Hardware BUSY arbitration | Eliminates need for external semaphores or software polling; resolves address contention in ≤30 ns (tBDD) |
| Interrupt mailbox addressing | Uses standard SRAM locations 7FEh (INTL) and 7FFh (INTR) as hardware-signaled message registers |
| 2 V data retention | Preserves memory contents during main power loss using coin-cell backup-no external retention circuitry required |
| Industrial-grade low-power standby | Full standby current ≤0.2 µA ensures multi-year battery life in always-on monitoring or telemetry nodes |
Applications
| Real-Time Industrial PLC | Dual-Core Embedded Controller |
|---|---|
Use Scenario: Two independent CPU cores share sensor data and control commands via shared memory without OS-level locking. IC Role / Device Role / Timing Role: 71V321L35PFGI8 acts as a hardware-synchronized mailbox-left port serves CPU A, right port serves CPU B, with BUSY preventing race conditions. Use Value: Deterministic <30 ns arbitration eliminates software mutex overhead and guarantees sub-microsecond inter-core latency. | Use Scenario: An FPGA configures and monitors a microcontroller via shared memory, exchanging status, calibration tables, and firmware updates. IC Role / Device Role / Timing Role: 71V321L35PFGI8 provides non-blocking dual-access RAM-FPGA writes to 7FFh to signal events, MCU reads INTL to respond. Use Value: Hardware interrupt flags reduce polling frequency by >95%, freeing MCU cycles for real-time control tasks. |
| Redundant Avionics Data Buffer | Medical Imaging Signal Pipeline |
Use Scenario: Primary and backup flight computers maintain synchronized state using mirrored memory with automatic conflict detection. IC Role / Device Role / Timing Role: 71V321L35PFGI8 serves as fault-tolerant buffer-BUSY signals mismatched writes, triggering failover before corrupted data propagates. Use Value: Built-in arbitration replaces dual-port FPGA logic, reducing BOM count and certification effort for DO-254 compliance. | Use Scenario: High-speed ADC streams raw image data to one port while DSP engine reads processed frames from the other port. IC Role / Device Role / Timing Role: 71V321L35PFGI8 functions as zero-latency frame buffer-35 ns access enables real-time pixel pipeline without FIFO bottlenecks. Use Value: Concurrent read/write avoids backpressure stalls, sustaining >28 MB/s throughput (8-bit × 35 ns⁻¹) across both ports. |
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-35AXC | 3.3 V, 2K × 16 organization, 35 ns access, 100-pin TQFP; no built-in BUSY logic-requires external arbitration | Supports wider data path but lacks hardware interrupt/mailbox; needs additional logic for interprocessor signaling | Select when 16-bit bus width is required and external arbitration is acceptable |
| AS7C3256B-35JCIN | 3.3 V, 32K × 8 organization, 35 ns access, 44-pin SOJ; single-port only; no dual-port or interrupt features | Higher density but no concurrent access capability-unsuitable for interprocessor communication | Select only for cost-sensitive, non-concurrent memory expansion where dual-port functionality is unnecessary |
Compared with CY7C024AV-35AXC and AS7C3256B-35JCIN, the 71V321L35PFGI8 uniquely integrates BUSY arbitration and interrupt mailbox logic in a compact 64-pin TQFP-reducing PCB area, eliminating external glue logic, and guaranteeing deterministic inter-core timing without software intervention.
Availability
71V321L35PFGI8 is available at Aetrix Electronics and suitable for real-time industrial PLCs, dual-core embedded controllers, redundant avionics systems, and medical imaging pipelines requiring stable component supply across extended product lifecycles.
Supply support for 71V321L35PFGI8 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 71V321L35PFGI8 belongs to Renesas' legacy dual-port SRAM portfolio-designed specifically for deterministic, low-latency interprocessor communication in safety-critical and real-time embedded systems.
FAQ
What is the guaranteed maximum access time for 71V321L35PFGI8 under industrial temperature conditions?
The 71V321L35PFGI8 guarantees a maximum read cycle time (tRC) of 35 ns across the full industrial temperature range (–40°C to +85°C) and supply voltage (3.0 V to 3.6 V). This value is production-tested and applies to both ports independently, ensuring deterministic timing for real-time system design without derating.
Does 71V321L35PFGI8 support true hardware arbitration, and how does it prevent write conflicts?
Yes, the 71V321L35PFGI8 implements hardware arbitration via its BUSYL and BUSYR outputs. When both ports attempt to access the same address simultaneously, the device asserts the BUSY signal on the later-arriving port, internally gating its write enable-preventing data corruption without software or external logic. The arbitration is based solely on CE and address timing, not R/W state.
How is interrupt functionality implemented in 71V321L35PFGI8, and what addresses trigger INTL and INTR?
The 71V321L35PFGI8 uses SRAM locations 7FEh (hex) and 7FFh (hex) as interrupt mailboxes. Writing to 7FEh via the right port asserts INTL; writing to 7FFh via the left port asserts INTR. Clearing is done by reading those addresses with OE and CE active. This requires no additional registers or configuration-only standard memory access.
What is the minimum supply voltage required to retain data in 71V321L35PFGI8 during power loss?
The 71V321L35PFGI8 retains stored data down to 2.0 V (VDR), as specified in the Data Retention Characteristics table. At VCC = 2.0 V, typical retention current is 100 µA, enabling reliable operation with standard 2 V lithium coin-cell backup without external regulators or charge pumps.
Is 71V321L35PFGI8 pin-compatible with earlier speed grades like 71V321L25PFGI8?
Yes, all 71V321L variants-including 71V321L25PFGI8 and 71V321L35PFGI8-share identical 64-pin TQFP (PNG64) pinouts and electrical interfaces. Speed grade differences affect only timing parameters (e.g., tRC = 25 ns vs. 35 ns); no PCB redesign or layout change is needed when upgrading or substituting within the same package variant.
71V321L35PFGI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 35ns
- Access Time:
- 35 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)
71V321L35PFGI8 FAQ
1.How can I place an order for 71V321L35PFGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L35PFGI8 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 71V321L35PFGI8 reliable?
The price and inventory of 71V321L35PFGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L35PFGI8 is usually 5 days.
3.What payment methods are accepted for 71V321L35PFGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L35PFGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L35PFGI8?
71V321L35PFGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L35PFGI8 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 71V321L35PFGI8?
For technical support, including 71V321L35PFGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L35PFGI8 requirements.
6.How does Aetrix verify that 71V321L35PFGI8 is sourced from the original manufacturer or authorized distributors?
All 71V321L35PFGI8 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 71V321L35PFGI8 meets industry standards.
7.What is the process for return or replacement of 71V321L35PFGI8?
All 71V321L35PFGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L35PFGI8, 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 71V321L35PFGI8 part is unused and in its original packaging.
Return procedure for 71V321L35PFGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321L35PFGI8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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