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Renesas 71V321LA35PF8
- Part No.:
- 71V321LA35PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321LA35PF8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,220
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Product details
Overview
71V321LA35PF8 from Renesas Electronics (formerly IDT) is a high-speed 3.3V 2K × 8 dual-port static RAM with independent left/right ports, on-chip interrupt logic, and BUSY arbitration. It delivers 35 ns max access time, 325 mW typical active power, and supports battery backup data retention down to 2 V. It is used in real-time interprocessor communication systems such as industrial PLCs and telecom line cards where concurrent read/write access to shared memory is required.
For engineers reviewing the 71V321LA35PF8 datasheet, 71V321LA35PF8 pinout, 71V321LA35PF8 application, or 71V321LA35PF8 equivalent, key selection criteria include dual-port timing coordination, interrupt mailbox addressing (0x7FE/0x7FF), BUSY arbitration behavior, and compatibility with 3.3V TTL-level control signals across both ports.
Technical Context
The 71V321LA35PF8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port-no clock required. Its internal arbitration logic uses address and chip-enable matching (not R/W state) to assert BUSYL/BUSYR outputs, enabling hardware stall of contending writes without software intervention.
Interrupt functionality relies on dedicated mailbox addresses: writing to 0x7FF (right port) sets INTR; writing to 0x7FE (left port) sets INTL. Clearing occurs via read-access to the same address with OE and CE asserted-no dedicated clear command. All interrupt and BUSY outputs are totem-pole, eliminating external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), fully random-access SRAM array |
| Access Time (max) | 35 ns - defines minimum read cycle time (tRC) for worst-case timing margin in synchronous bus interfacing |
| Supply Voltage | 3.3 V ± 0.3 V - requires single-rail 3.3V supply; not 5V tolerant |
| Active Power (typ) | 325 mW - enables thermal management in dense embedded modules without forced cooling |
| Data Retention | 2 V minimum - allows battery-backed operation during main power loss, retaining contents at ultra-low standby current (≤100 µA) |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade deployment in harsh environments |
| I/O Compatibility | TTL-compatible inputs and outputs - interfaces directly with legacy 3.3V logic families without level-shifting |
Pinout & Package
71V321LA35PF8 is packaged in a 64-pin TQFP (thin quad flatpack), body size 10 mm × 10 mm × 1.4 mm, lead finish green (Pb-free), RoHS-compliant.
| 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; enables simultaneous but non-conflicting accesses |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit tristatable I/O; direction controlled by R/WL and OEL |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated from left port I/O; no contention risk when properly managed |
| CEL, CER | Chip enable (left/right) | Active-low enables; deassertion places respective port in low-power standby (ISB3 ≤ 0.2 mA) |
| OEL, OER | Output enable (left/right) | Active-low controls output drivers; high-Z state prevents bus conflicts during multiplexed sharing |
| R/WL, R/WR | Read/write control (left/right) | Active-low write strobe; determines data flow direction on I/O pins |
| INTL, INTR | Interrupt flags (left/right) | Open-drain compatible (totem-pole); asserted HIGH upon mailbox write (0x7FE/0x7FF) |
| BUSYL, BUSYR | Arbitration status (left/right) | Active-HIGH totem-pole outputs; indicate address collision and block pending writes |
| VCC, GND | Power and ground | Multiple VCC/GND pairs distributed across package for low-impedance decoupling and noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration logic | Hardware-based BUSY assertion eliminates need for software polling or semaphores in multi-CPU designs |
| Interprocessor interrupt mailbox | Two dedicated SRAM locations (0x7FE and 0x7FF) serve as hardware-triggered message flags with automatic set/clear semantics |
| 2V data retention mode | Enables seamless failover to coin-cell backup without volatile data loss during AC power interruption |
| Asynchronous operation | No clock required-simplifies timing closure in mixed-signal or legacy bus architectures with variable latency |
| Low-power standby | Full standby current ≤ 0.2 mA (ISB3) reduces system-level quiescent power in always-on edge nodes |
Applications
| Industrial PLC Memory Sharing | Telecom Line Card Buffering |
|---|---|
Use Scenario: Two microcontrollers in a programmable logic controller share configuration and I/O status data via a common memory space. IC Role / Device Role / Timing Role: Dual-port SRAM acts as a hardware-synchronized shared memory buffer with BUSY arbitration preventing race conditions during concurrent access. Use Value: Eliminates software mutex overhead and guarantees deterministic response under worst-case interrupt load. | Use Scenario: A DSP and ARM host processor exchange packet metadata and control commands in a 4G/LTE baseband subsystem. IC Role / Device Role / Timing Role: 71V321LA35PF8 provides non-blocking, low-latency inter-processor communication using interrupt-driven mailbox protocol. Use Value: Reduces inter-core latency to <35 ns, enabling real-time scheduling of radio frame processing tasks. |
| Avionics Data Logger Interface | Medical Imaging Control Module |
Use Scenario: Flight data recorder firmware writes sensor snapshots while maintenance interface reads historical logs concurrently. IC Role / Device Role / Timing Role: Acts as a fault-tolerant dual-port buffer with battery-backed retention ensuring crash data survives power loss. Use Value: Guarantees zero data loss during brownout events; meets DO-254 safety-critical data integrity requirements. | Use Scenario: FPGA-based image acquisition engine streams raw pixel data into shared memory while ARM CPU processes DICOM headers and metadata. IC Role / Device Role / Timing Role: Provides deterministic bandwidth partitioning between high-throughput DMA and low-priority control reads/writes. Use Value: Enables pipelined image capture without frame drops, even during CPU-intensive DICOM compression. |
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 | 3.3V 2K × 16 organization; 35 ns access; no built-in interrupt logic; requires external arbitration | Requires additional logic for mailbox/interrupt emulation; wider data bus suits 16-bit processors | Choose when 16-bit data path is needed and interrupt handling can be implemented externally |
| AS7C3256B-35JCIN | 3.3V 32K × 8 organization; 35 ns access; no BUSY or interrupt features; standard single-port interface | Lacks dual-port concurrency; requires software-managed semaphores for multi-CPU access | Choose only if dual-port functionality is unnecessary and higher density is prioritized over interprocessor coordination |
Compared with CY7C024AV-35AXC and AS7C3256B-35JCIN, the 71V321LA35PF8 uniquely integrates hardware arbitration and interrupt mailbox logic-reducing BOM count, PCB area, and firmware complexity in tightly coupled multi-processor systems.
Availability
71V321LA35PF8 is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, avionics data loggers, and medical imaging control modules requiring stable component supply across extended product lifecycles.
Supply support for 71V321LA35PF8 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 memory solutions for automotive, industrial, and IoT applications.
The 71V321LA35PF8 belongs to Renesas' legacy dual-port SRAM portfolio, originally developed by IDT to address deterministic interprocessor communication in real-time embedded systems.
FAQ
What is the exact memory capacity and organization of the 71V321LA35PF8?
The 71V321LA35PF8 contains 2,048 words of 8-bit static RAM, organized as 2K × 8. This yields 16,384 total bits with full random-access capability across both ports. Address lines A0L–A10L and A0R–A10R each provide 11-bit decoding, covering the full 2K address space independently.
Does the 71V321LA35PF8 support true simultaneous read/write operations on both ports?
Yes-the 71V321LA35PF8 supports fully asynchronous, independent read and write operations on left and right ports. However, if both ports access the same address simultaneously, BUSY logic asserts to stall one port. Concurrent access to different addresses proceeds without interference, enabling true parallelism in multi-CPU systems.
How does the interrupt function work in the 71V321LA35PF8?
The 71V321LA35PF8 uses two dedicated SRAM addresses as interrupt mailboxes: writing to 0x7FF (hex) on the left port sets the INTR flag; writing to 0x7FE sets INTL. Reading those same addresses with OE and CE asserted clears the respective flag. No external logic is needed-the 71V321LA35PF8 handles set/clear entirely in hardware.
What is the significance of the "L" and "A35" in the 71V321LA35PF8 part number?
In 71V321LA35PF8, "L" denotes the low-power version with 2V data retention capability, and "A35" specifies 35 ns maximum access time. "PF" indicates the 64-pin TQFP package, and "8" signifies tape-and-reel packaging. The "A" prefix in "A35" aligns with IDT's legacy speed grade coding for commercial/industrial temperature range devices.
Can the 71V321LA35PF8 operate with only one port enabled while the other remains inactive?
Yes-the 71V321LA35PF8 supports independent port power-down: asserting CEL = VIH places the left port in standby (ISB3 ≤ 0.2 mA), while CER = VIH does the same for the right port. Both ports may be active, one active/one standby, or both in full standby-enabling dynamic power scaling based on real-time system workload.
71V321LA35PF8 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:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
71V321LA35PF8 FAQ
1.How can I place an order for 71V321LA35PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321LA35PF8 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 71V321LA35PF8 reliable?
The price and inventory of 71V321LA35PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321LA35PF8 is usually 5 days.
3.What payment methods are accepted for 71V321LA35PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321LA35PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321LA35PF8?
71V321LA35PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321LA35PF8 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 71V321LA35PF8?
For technical support, including 71V321LA35PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321LA35PF8 requirements.
6.How does Aetrix verify that 71V321LA35PF8 is sourced from the original manufacturer or authorized distributors?
All 71V321LA35PF8 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 71V321LA35PF8 meets industry standards.
7.What is the process for return or replacement of 71V321LA35PF8?
All 71V321LA35PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321LA35PF8, 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 71V321LA35PF8 part is unused and in its original packaging.
Return procedure for 71V321LA35PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321LA35PF8 Tags
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