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Renesas 71V321L25PFGI8
- Part No.:
- 71V321L25PFGI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321L25PFGI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,526
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Product details
Overview
71V321L25PFGI8 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 supports fully asynchronous access from independent left/right ports, delivers 25 ns max read cycle time, consumes 325 mW typical active power, and retains data down to 2.0 V for battery backup operation. It is used in real-time embedded systems requiring concurrent memory access between two processors or DMA engines.
For engineers reviewing the 71V321L25PFGI8 datasheet, 71V321L25PFGI8 pinout, 71V321L25PFGI8 application, or 71V321L25PFGI8 equivalent, key selection criteria include dual-port arbitration timing (tBDD ≤ 45 ns), interrupt flag behavior (INTL/INTR set/clear via dedicated mailbox addresses 7FEh/7FFh), industrial temperature support (–40°C to +85°C), and TQFP-64 package compatibility with PCB layout constraints.
Technical Context
The 71V321L25PFGI8 implements hardware-based port arbitration using totem-pole BUSYL/BUSYR outputs that assert when both ports simultaneously access the same address - regardless of read/write direction - enabling deterministic contention resolution without software intervention. Its interrupt logic uses fixed mailbox addresses (7FEh for INTL, 7FFh for INTR) where write operations from one port trigger flags readable by the other port.
Each port features independent CE/OE/R/W controls, full TTL-compatible I/O, and automatic power-down when CE = VIH. The device operates exclusively from a single 3.3 V supply (3.0–3.6 V), with standby current as low as 0.2 mA (ISB3, CMOS-level inputs) and data retention at 2.0 V, making it suitable for hybrid power architectures with backup batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (16,384 bits), fully random-access SRAM array |
| Access Time (tRC) | 25 ns max - defines minimum cycle time for consecutive reads/writes |
| Supply Voltage | 3.3 V ± 0.3 V - single-rail operation; no separate VDDQ or analog rails required |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Active Power (typ.) | 325 mW - enables thermal management in dense multi-processor modules |
| Data Retention Voltage | 2.0 V min - supports nonvolatile hold mode during main supply loss |
| Interrupt Latency (tINS) | 25 ns max - ensures timely interprocessor signaling in hard real-time loops |
Pinout & Package
71V321L25PFGI8 is packaged in a 64-pin TQFP (Thin Quad Flat Pack), body size 10 mm × 10 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant green finish. Pin 1 is marked by a dot; all VCC pins must be decoupled locally, and all GND pins require low-impedance grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (0–2047) |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access (0–2047) |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; high-impedance when OER = VIH or CER = VIH |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; drives internal power-down when high |
| OEL / OER | Output enable (left/right) | Active-low enables output drivers; does not affect input receivers |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; controls direction of I/O bus transceivers |
| INTL / INTR | Interrupt flag outputs | Open-drain compatible (totem-pole); asserted when opposite port writes to 7FEh/7FFh |
| BUSYL / BUSYR | Arbitration busy outputs | Totem-pole outputs; go low when opposite port accesses same address |
| VCC / GND | Power supply pins | Four VCC and four GND pins distributed for low-noise, low-impedance routing |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration with BUSY outputs | Hardware-enforced conflict detection and resolution without CPU overhead or external logic |
| Interprocessor interrupt mailbox | Dedicated 8-bit SRAM locations (7FEh/7FFh) provide zero-latency, lock-free message passing |
| Single 3.3 V supply operation | Eliminates need for level shifters or auxiliary voltage rails in modern 3.3 V system designs |
| Industrial temperature range | Guaranteed functionality across –40°C to +85°C ambient, supporting harsh deployment environments |
| Low-power standby modes | Full standby current as low as 0.2 mA enables energy-efficient sleep states in battery-backed systems |
Applications
| Real-Time Dual-Core Control | Redundant Safety Controller |
|---|---|
Use Scenario: Two ARM Cortex-R5 cores share sensor fusion data and actuator command buffers in an automotive ADAS domain controller. IC Role / Device Role / Timing Role: 71V321L25PFGI8 serves as a shared memory hub with hardware arbitration, eliminating software locks and ensuring deterministic latency under worst-case contention. Use Value: Enables sub-25 ns inter-core data exchange while maintaining functional safety integrity via atomic mailbox interrupts and BUSY-stall synchronization. | Use Scenario: A dual-channel PLC module uses independent microcontrollers for primary and backup control paths, sharing status, diagnostics, and configuration tables. IC Role / Device Role / Timing Role: 71V321L25PFGI8 acts as a fault-tolerant memory bridge, allowing cross-checking of state variables and failover coordination via interrupt-driven mailbox updates. Use Value: Provides guaranteed data coherency and synchronized failover response (<50 ns BUSY disable-to-data delay) without external arbitration logic. |
| Industrial Ethernet Bridge | Avionics Data Concentrator |
Use Scenario: An EtherCAT master node interfaces with FPGA-based motion control logic and a real-time Linux host, exchanging cyclic process data and configuration parameters. IC Role / Device Role / Timing Role: 71V321L25PFGI8 functions as a high-bandwidth, low-latency buffer between protocol stack and hardware accelerator, with independent port timing. Use Value: Delivers 25 ns access time and 325 mW active power, enabling deterministic 100 µs cycle times in multi-axis servo systems. | Use Scenario: A DO-254-certified flight data recorder aggregates ARINC 429, MIL-STD-1553, and discrete I/O streams into a unified timestamped buffer before storage. IC Role / Device Role / Timing Role: 71V321L25PFGI8 provides radiation-tolerant (industrial-grade) dual-port buffering with 2 V data retention for brownout resilience. Use Value: Ensures continuous data capture during transient power faults, meeting DO-160 Section 22 Level A requirements for voltage sag immunity. |
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-25AXC | 2K × 16 organization, 25 ns access, 3.3 V, but lacks integrated BUSY arbitration and mailbox interrupts | Requires external logic for contention handling and software-managed messaging | Choose when wider data bus (16-bit) is needed and arbitration can be implemented externally |
| AS7C3256B-25JCIN | 32K × 8 organization, 25 ns, 3.3 V, no dual-port arbitration or interrupt logic; standard single-port SRAM | Needs external dual-port controller (e.g., FPGA) for concurrent access support | Choose only if memory density >2K × 8 is required and full dual-port logic resides elsewhere |
Compared with CY7C024AV-25AXC and AS7C3256B-25JCIN, the 71V321L25PFGI8 uniquely integrates hardware arbitration and interrupt mailbox logic in a 2K × 8 footprint, reducing BOM count and eliminating software synchronization overhead in tightly coupled dual-processor systems.
Availability
71V321L25PFGI8 is available at Aetrix Electronics and suitable for real-time dual-core control, redundant safety controllers, industrial Ethernet bridges, and avionics data concentrators requiring stable component supply across extended product lifecycles.
Supply support for 71V321L25PFGI8 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 delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The 71V321L25PFGI8 belongs to Renesas' legacy dual-port SRAM product line, originally developed by IDT, designed specifically for deterministic interprocessor communication in hard real-time embedded systems with minimal external logic.
FAQ
What is the operating temperature range supported by the 71V321L25PFGI8?
The 71V321L25PFGI8 is rated for industrial temperature operation from –40°C to +85°C. This range is fully specified across all DC and AC electrical characteristics, including access time, power consumption, and BUSY/interrupt timing parameters. It does not support extended or military temperature grades.
Does the 71V321L25PFGI8 require external pull-up resistors on BUSY or interrupt pins?
No. The 71V321L25PFGI8 features totem-pole outputs on BUSYL, BUSYR, INTL, and INTR pins, meaning they actively drive both HIGH and LOW states. External pull-up resistors are unnecessary and should not be used, as they may cause contention or excessive current draw during output transitions.
How does the mailbox interrupt mechanism work in the 71V321L25PFGI8?
The 71V321L25PFGI8 uses fixed SRAM addresses 7FEh (for INTL) and 7FFh (for INTR) as mailbox locations. Writing to 7FEh from the right port asserts INTL; writing to 7FFh from the left port asserts INTR. Clearing is done by reading those same addresses with OE and CE asserted on the respective port. No additional control registers or configuration is required.
Can the 71V321L25PFGI8 operate from a 2.5 V supply?
No. The 71V321L25PFGI8 is strictly a 3.3 V device, with recommended supply range 3.0 V to 3.6 V. Operation below 3.0 V violates the Absolute Maximum Ratings and will result in undefined behavior, including failure to retain data or respond to control signals. The 2.0 V specification applies only to data retention mode during backup, not active operation.
What is the significance of the 'PFGI8' suffix in 71V321L25PFGI8?
The 'PFGI8' suffix denotes: P = TQFP package, F = 64-pin count, G = green (lead-free) finish, I = industrial temperature grade (–40°C to +85°C), and 8 = tape-and-reel packaging. This distinguishes it from commercial-grade (C) or PLCC-packaged variants, confirming its suitability for ruggedized industrial deployments.
71V321L25PFGI8 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:
- 25ns
- Access Time:
- 25 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)
71V321L25PFGI8 FAQ
1.How can I place an order for 71V321L25PFGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L25PFGI8 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 71V321L25PFGI8 reliable?
The price and inventory of 71V321L25PFGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L25PFGI8 is usually 5 days.
3.What payment methods are accepted for 71V321L25PFGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L25PFGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L25PFGI8?
71V321L25PFGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L25PFGI8 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 71V321L25PFGI8?
For technical support, including 71V321L25PFGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L25PFGI8 requirements.
6.How does Aetrix verify that 71V321L25PFGI8 is sourced from the original manufacturer or authorized distributors?
All 71V321L25PFGI8 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 71V321L25PFGI8 meets industry standards.
7.What is the process for return or replacement of 71V321L25PFGI8?
All 71V321L25PFGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L25PFGI8, 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 71V321L25PFGI8 part is unused and in its original packaging.
Return procedure for 71V321L25PFGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321L25PFGI8 Tags
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