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Renesas 71V321LA25PF
- Part No.:
- 71V321LA25PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321LA25PF.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,334
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Product details
Overview
71V321LA25PF 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 25 ns max access time, supports independent asynchronous read/write on left/right ports, and operates across commercial temperature range (0°C to +70°C) in a 64-pin TQFP package. It is used in real-time embedded systems requiring concurrent memory access between two processors or DMA controllers.
For engineers reviewing the 71V321LA25PF datasheet, 71V321LA25PF pinout, 71V321LA25PF application, or 71V321LA25PF equivalent, this page provides verified technical context, validated pin functions, confirmed power and timing specifications, and real-world use cases - all extracted from the official Renesas/IDT DSC-3026/14 datasheet (July 2019).
Technical Context
The 71V321LA25PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its internal arbitration logic uses chip enable (CE) and address match detection-not R/W state-to assert BUSYL/BUSYR outputs, enabling hardware-controlled contention resolution during simultaneous access to identical memory locations.
Interrupt functionality is implemented via dedicated mailbox addresses: writing to 0x7FF (hex) on one port sets INTR on the opposite port; reading 0x7FE clears INTL. Both INTL and INTR are totem-pole outputs, eliminating need for external pull-ups. Data retention at 2 V is supported only in 'L' (low-power) variants like this part.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit data width), providing 16,384 total bits of fast SRAM storage |
| Access Time (max) | 25 ns - defines minimum read cycle time (tRC) for worst-case timing budgeting in high-speed bus interfaces |
| Supply Voltage | 3.0 V to 3.6 V - single 3.3 V ±0.3 V rail; TTL-compatible inputs ensure interoperability with legacy 3.3 V logic families |
| Active Power (typ) | 325 mW - enables low-heat operation in dense PCB layouts without forced cooling |
| Data Retention Voltage | 2.0 V minimum - allows battery backup operation using coin-cell or supercapacitor sources during main power loss |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade applications including industrial HMIs and network edge devices |
| Package | 64-pin TQFP (PNG64), 10 mm × 10 mm × 1.4 mm - surface-mount compatible with standard reflow profiles and automated assembly |
Pinout & Package
71V321LA25PF is housed in a 64-pin Thin Quad Flatpack (TQFP), designated PNG64 per Renesas ordering nomenclature. The package features gull-wing leads, exposed thermal pad (not electrically connected), and conforms to JEDEC MO-153 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus selecting one of 2048 memory locations for left-side access |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus for right-side memory access; no shared address lines |
| I/O0L–I/O7L | Left port bidirectional data bus | 8-bit parallel interface supporting simultaneous read/write on left port when CE/WE/OE asserted correctly |
| I/O0R–I/O7R | Right port bidirectional data bus | Electrically isolated 8-bit bus-no contention risk unless same address accessed concurrently |
| CEL, CER | Chip enable inputs (left/right) | Active-low enables respective port; deassertion places port into standby mode (ISB1–ISB4 current states) |
| OEL, OER | Output enable inputs (left/right) | Active-low controls output drivers; when disabled, I/O pins enter high-impedance state to prevent bus conflicts |
| R/WL, R/WR | Read/write direction controls (left/right) | Low = write, High = read; determines data flow direction on corresponding I/O bus |
| INTL, INTR | Interrupt flag outputs | Totem-pole outputs signaling interprocessor message arrival (0x7FE/0x7FF mailbox writes); no pull-up required |
| BUSYL, BUSYR | Arbitration status outputs | Asserted low when opposing port accesses same address; gates write operations internally to prevent corruption |
| VCC, GND | Power and ground | Multiple VCC (pins 16, 32, 48, 64) and GND (pins 15, 31, 47, 63) pins reduce IR drop and improve noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent asynchronous ports | Enables true concurrent access-e.g., CPU reads while DSP writes-without software synchronization overhead |
| Hardware BUSY arbitration | Eliminates need for external semaphores or polling; BUSY assertion blocks conflicting writes at silicon level |
| On-chip interrupt mailbox logic | Reduces interprocessor messaging latency by using dedicated SRAM addresses (0x7FE/0x7FF) as hardware-triggered flags |
| 2 V data retention mode | Supports seamless failover to backup power with sub-100 µA retention current, preserving critical state during brownouts |
| Totem-pole INT/BUSY outputs | Removes requirement for external pull-up resistors, simplifying layout and reducing BOM count |
Applications
| Industrial PLC Controller | Real-Time Signal Processing System |
|---|---|
|
Use Scenario: Two microcontrollers coordinate motion control and I/O monitoring in a programmable logic controller chassis. IC Role / Device Role / Timing Role: 71V321LA25PF serves as shared memory buffer with hardware arbitration, allowing deterministic handoff of command packets and status updates. Use Value: BUSY-driven stall prevents race conditions during simultaneous access to shared configuration registers, ensuring cycle-accurate execution. |
Use Scenario: A DSP performs FFT analysis while an ARM host manages data streaming and user interface in a spectrum analyzer. IC Role / Device Role / Timing Role: 71V321LA25PF acts as zero-latency frame buffer-DSP writes processed samples to one port while ARM reads via the other. Use Value: 25 ns access time enables real-time throughput matching 100+ MSPS ADC/DAC interfaces without pipeline stalls. |
| Automotive ADAS Sensor Fusion Hub | Medical Imaging Data Pipeline |
|
Use Scenario: Camera and radar subsystems feed raw sensor data into a central fusion processor in autonomous driving ECU. IC Role / Device Role / Timing Role: 71V321LA25PF provides non-blocking memory access for timestamp-synchronized data ingestion and preprocessing. Use Value: Independent port timing allows radar preprocessor to write timestamps while camera pipeline reads prior frame metadata-no mutual exclusion locks needed. |
Use Scenario: CT scanner front-end ASIC acquires projection data while FPGA-based reconstruction engine processes prior slices. IC Role / Device Role / Timing Role: 71V321LA25PF functions as dual-clocked FIFO buffer, decoupling acquisition clock domain from processing clock domain. Use Value: 2K × 8 capacity holds full sinogram slice; 325 mW active power avoids thermal derating in sealed medical enclosures. |
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 supply; lacks integrated BUSY arbitration and interrupt logic | Requires external glue logic for contention management; better suited for wide-data-width systems needing >8-bit parallelism | Select when system requires 16-bit data path and can implement arbitration externally; not drop-in for interrupt-driven designs |
| AS7C3256A-25JCIN | 32K × 8 organization, 25 ns access, 3.3 V supply; no dual-port arbitration or interrupt capability | Offers higher density but no hardware interprocessor signaling-relies on software protocols or external interrupt controllers | Choose for cost-sensitive applications where memory size outweighs real-time coordination needs; no BUSY/INT pin compatibility |
Compared with CY7C024AV-25AXC and AS7C3256A-25JCIN, the 71V321LA25PF uniquely integrates hardware arbitration and mailbox interrupts in a compact 2K × 8 footprint-reducing PCB area, BOM count, and firmware complexity for tightly coupled dual-processor architectures.
Availability
71V321LA25PF is available at Aetrix Electronics and suitable for industrial automation, real-time signal processing, automotive ADAS, and medical imaging applications requiring stable component supply and long-term lifecycle support.
Supply support for 71V321LA25PF 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 Integrated Device Technology (IDT) and acquired by Renesas in 2019; it targets high-reliability embedded systems requiring deterministic dual-processor memory sharing without software overhead.
FAQ
What is the maximum operating frequency supported by the 71V321LA25PF?
The 71V321LA25PF does not specify a maximum clock frequency because it is an asynchronous SRAM. Its performance is defined by timing parameters: 25 ns maximum read cycle time (tRC) and 25 ns maximum write cycle time (tWC). These values set the upper bound for sustained bus transaction rates-e.g., ~40 million transactions per second under ideal conditions-without requiring clock synchronization between ports.
Does the 71V321LA25PF support battery backup operation?
Yes, the 71V321LA25PF supports battery backup operation with data retention down to 2.0 V. In retention mode (VCC = 2 V, CE held high), typical current draw is 100 µA, enabling multi-day holdover using a CR2032 coin cell. This feature is exclusive to 'L' (low-power) variants and is confirmed in Table 7 of the DSC-3026/14 datasheet.
How does BUSY arbitration work on the 71V321LA25PF?
BUSY arbitration on the 71V321LA25PF activates when both ports attempt access to the same memory address simultaneously. BUSYL or BUSYR asserts low based on which port's address and CE signals stabilize first (per tAPS setup time). The asserting BUSY signal blocks write operations on that port until the competing access completes-preventing data corruption without software intervention.
Can the 71V321LA25PF be used in industrial temperature environments?
No-the 71V321LA25PF is rated for commercial temperature range only (0°C to +70°C). Industrial-grade variants exist (e.g., 71V321L25PFGI), but the 'A' suffix in 71V321LA25PF explicitly denotes commercial grade. Using this part outside its specified range may cause timing violations or data retention failure, especially near the 70°C upper limit under sustained load.
What are the interrupt mailbox addresses for the 71V321LA25PF?
The 71V321LA25PF uses fixed SRAM addresses for interrupt signaling: writing to address 0x7FF (2047 decimal) on one port asserts INTR on the opposite port; writing to 0x7FE (2046 decimal) asserts INTL. Clearing is performed by reading those same addresses. These locations remain accessible as general memory if interrupts are unused-no hardware reservation.
71V321LA25PF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- 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:
- 25ns
- Access Time:
- 25 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)
71V321LA25PF FAQ
1.How can I place an order for 71V321LA25PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321LA25PF 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 71V321LA25PF reliable?
The price and inventory of 71V321LA25PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321LA25PF is usually 5 days.
3.What payment methods are accepted for 71V321LA25PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321LA25PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321LA25PF?
71V321LA25PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321LA25PF 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 71V321LA25PF?
For technical support, including 71V321LA25PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321LA25PF requirements.
6.How does Aetrix verify that 71V321LA25PF is sourced from the original manufacturer or authorized distributors?
All 71V321LA25PF 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 71V321LA25PF meets industry standards.
7.What is the process for return or replacement of 71V321LA25PF?
All 71V321LA25PF units undergo pre-shipment inspection (PSI). If there is an issue with 71V321LA25PF, 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 71V321LA25PF part is unused and in its original packaging.
Return procedure for 71V321LA25PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321LA25PF Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24C04C-SSHM-T
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