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Renesas 71V321SA35PF8
- Part No.:
- 71V321SA35PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321SA35PF8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,114
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Product details
Overview
71V321SA35PF8 from Renesas Electronics is a high-speed 3.3V 2K × 8 dual-port static RAM with interrupt logic and BUSY arbitration, designed for interprocessor communication in real-time embedded systems. It delivers 35 ns max access time, supports fully asynchronous dual-port operation, features two independent INT flags (INTL/INTR), and operates across commercial temperature range (0°C to +70°C) in a 64-pin TQFP package.
For engineers reviewing the 71V321SA35PF8 datasheet, 71V321SA35PF8 pinout, 71V321SA35PF8 application, or 71V321SA35PF8 equivalent, this device serves as a stand-alone 8-bit dual-access memory with hardware port arbitration, battery-backed data retention capability (2V), and TTL-compatible I/O - critical for deterministic multi-processor synchronization and mailbox-based messaging.
Technical Context
The 71V321SA35PF8 implements fully independent left/right ports with separate address, control, and bidirectional I/O buses, enabling concurrent read/write access without software coordination. Its on-chip arbitration logic uses address and chip-enable matching (not R/W state) to assert BUSYL/BUSYR outputs, blocking writes on contested addresses while allowing reads to proceed.
Interrupt functionality is implemented via dedicated mailbox addresses: writing to 0x7FE triggers INTL; reading from 0x7FE clears it. Similarly, 0x7FF controls INTR. Both BUSY and INT signals are totem-pole outputs - no external pull-ups required - and support depth expansion using external AND gates for array-level BUSY aggregation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), providing 16 KB total storage per port |
| Access Time (max) | 35 ns - guarantees worst-case read latency under full commercial conditions (VCC = 3.3 V ± 0.3 V, TA = 0°C to +70°C) |
| Supply Voltage | 3.0 V to 3.6 V - single 3.3 V rail with ±0.3 V tolerance; compatible with standard LVTTL logic levels |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low power consumption when both ports are fully deselected (CMOS-level inputs) |
| Data Retention Voltage | 2.0 V min. - maintains stored data during brown-out or backup-battery operation |
| Operating Temperature | 0°C to +70°C - commercial-grade thermal specification verified per JEDEC JESD22-A108 |
| Package | 64-pin TQFP (PNG64), 10 mm × 10 mm × 1.4 mm body - surface-mount compatible with standard reflow profiles |
Pinout & Package
71V321SA35PF8 is housed in a 64-pin thin quad flatpack (TQFP) package, designated PNG64 per Renesas ordering nomenclature. The package provides 32 I/O pins (16 per port), dual VCC/GND pairs for noise isolation, and dedicated control, address, and status signals for both left and right ports.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus selecting one of 2048 locations for left-side access |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; direction controlled by R/WL and OEL |
| CEL, OEL, R/WL | Left port enable/control | Chip Enable, Output Enable, Read/Write select - fully asynchronous port activation |
| BUSYL, INTL | Left port status outputs | BUSYL indicates address contention; INTL signals mailbox write from right port |
| A0R–A10R | Right port address inputs | Independent 11-bit address space mirroring left port |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated 8-bit path supporting concurrent left/right transfers |
| CER, OER, R/WR | Right port enable/control | Functionally identical to left-side controls but with independent timing domains |
| BUSYR, INTR | Right port status outputs | BUSYR asserts on right-port address conflict; INTR set by left-port write to 0x7FF |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration with BUSY outputs | Hardware-enforced address collision detection eliminates software polling; totem-pole BUSY drives directly into microcontroller interrupt pins |
| Interprocessor interrupt mailbox | Dedicated SRAM addresses (0x7FE/0x7FF) act as hardware-triggered flags - no firmware overhead to detect cross-port events |
| Asynchronous port independence | Left and right ports operate at different clock domains or even DC-coupled - no global sync required between accesses |
| Low-power standby modes | ISB3 = 0.2 mA typ. enables energy-sensitive applications; data retention down to 2.0 V extends battery life in backup scenarios |
| TTL-compatible 3.3 V interface | VIL ≤ 0.8 V / VIH ≥ 2.0 V ensures interoperability with legacy 3.3 V logic families without level-shifting circuitry |
Applications
| Industrial PLC Communication Module | Avionics Data Concentrator |
|---|---|
Use Scenario: Two independent CPU cores exchange sensor telemetry and control commands via shared memory in a safety-critical programmable logic controller. IC Role / Device Role / Timing Role: 71V321SA35PF8 acts as deterministic, lock-free inter-core buffer with hardware arbitration preventing simultaneous writes to same register. Use Value: Eliminates software mutex overhead and guarantees sub-35 ns response to cross-core interrupts - meeting IEC 61508 SIL-3 timing constraints. | Use Scenario: A flight management system consolidates ARINC 429, discrete I/O, and analog sensor data before routing to central avionics computer. IC Role / Device Role / Timing Role: 71V321SA35PF8 serves as dual-access FIFO buffer where input processor writes raw data and output processor reads formatted packets. Use Value: BUSY flag prevents data corruption during burst transfers; 2V data retention preserves last valid state during power interruption per DO-160 Section 22 Level A. |
| Medical Imaging Subsystem | Automotive ADAS Sensor Fusion Hub |
Use Scenario: Real-time ultrasound beamformer and image reconstruction engines share pixel buffers and calibration tables in portable diagnostic equipment. IC Role / Device Role / Timing Role: 71V321SA35PF8 functions as low-latency, non-blocking memory bridge - left port handles DMA from ADC, right port feeds GPU texture engine. Use Value: 35 ns access time sustains >120 MB/s sustained bandwidth; interrupt flags synchronize frame start/end without CPU intervention. | Use Scenario: Radar, camera, and ultrasonic sensors feed preprocessed object lists into a central fusion ECU running real-time OS. IC Role / Device Role / Timing Role: 71V321SA35PF8 provides time-deterministic mailbox between sensor preprocessing cores and fusion scheduler core. Use Value: Hardware mailbox (0x7FE/0x7FF) reduces inter-core latency to <25 ns - critical for ISO 26262 ASIL-B timing budgets in sensor handoff. |
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; no built-in BUSY logic - requires external arbitration | Supports wider data paths but lacks hardware interrupt/mailbox; needs additional logic for contention handling | Select when 16-bit data width is required and external arbitration is acceptable |
| AS7C3256B-35JCIN | 3.3 V, 32K × 8 organization; 35 ns access; no dual-port arbitration or interrupt flags | Higher density but single-port only - requires software-managed semaphores or external dual-port controller | Choose for cost-sensitive applications needing larger memory without hardware coherency |
Compared with CY7C024AV-35AXC and AS7C3256B-35JCIN, the 71V321SA35PF8 uniquely integrates address-matching BUSY arbitration and dedicated interrupt mailboxes - reducing BOM count, PCB area, and firmware complexity in tightly coupled multi-processor designs.
Availability
71V321SA35PF8 is available at Aetrix Electronics and suitable for industrial PLC communication modules, avionics data concentrators, medical imaging subsystems, and automotive ADAS sensor fusion hubs requiring stable component supply and long-term lifecycle support.
Supply support for 71V321SA35PF8 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 SoC solutions for automotive, industrial, infrastructure, and IoT markets.
The 71V321SA35PF8 belongs to Renesas' legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware arbitration and low-latency mailboxing are essential.
FAQ
What is the maximum operating frequency supported by the 71V321SA35PF8?
The 71V321SA35PF8 does not specify a maximum clock frequency because it is an asynchronous SRAM. Its performance is defined by timing parameters: 35 ns max access time (tAA), 35 ns max read cycle time (tRC), and 35 ns max write cycle time (tWC). System timing must satisfy all AC specifications in the datasheet - including setup/hold times - rather than relying on a fixed clock rate.
Does the 71V321SA35PF8 support battery backup operation?
Yes, the 71V321SA35PF8 supports battery backup operation with data retention down to 2.0 V (VDR min.), consuming ≤500 µA typical at 2 V. This capability is inherent to the "L" (low-power) variant designation in the part number and is validated across the commercial temperature range.
How do the BUSY outputs function during simultaneous access to the same address?
When both ports attempt access to the same memory location, the 71V321SA35PF8 asserts BUSYL or BUSYR (but never both simultaneously) based on relative timing of address and CE assertion. The port that meets arbitration priority (tAPS ≥5 ns) proceeds; the other port's BUSY output goes LOW, gating its write signal internally - ensuring data integrity without external logic.
Can the 71V321SA35PF8 be used in industrial temperature applications?
No - the 71V321SA35PF8 is specified only for commercial temperature range (0°C to +70°C). Industrial-grade variants exist (e.g., 71V321L35JGI8), but the "A" suffix in 71V321SA35PF8 explicitly denotes commercial grade per Renesas ordering nomenclature.
What are the interrupt mailbox addresses for the 71V321SA35PF8?
The 71V321SA35PF8 uses fixed SRAM addresses for interrupt signaling: writing to address 0x7FE (2046 decimal) sets the left-port interrupt flag (INTL); writing to 0x7FF (2047 decimal) sets the right-port interrupt flag (INTR). Reading from those same addresses clears the respective flags - no dedicated control registers are required.
71V321SA35PF8 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)
71V321SA35PF8 FAQ
1.How can I place an order for 71V321SA35PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321SA35PF8 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 71V321SA35PF8 reliable?
The price and inventory of 71V321SA35PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321SA35PF8 is usually 5 days.
3.What payment methods are accepted for 71V321SA35PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321SA35PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321SA35PF8?
71V321SA35PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321SA35PF8 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 71V321SA35PF8?
For technical support, including 71V321SA35PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321SA35PF8 requirements.
6.How does Aetrix verify that 71V321SA35PF8 is sourced from the original manufacturer or authorized distributors?
All 71V321SA35PF8 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 71V321SA35PF8 meets industry standards.
7.What is the process for return or replacement of 71V321SA35PF8?
All 71V321SA35PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321SA35PF8, 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 71V321SA35PF8 part is unused and in its original packaging.
Return procedure for 71V321SA35PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321SA35PF8 Tags
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