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Renesas 71V321LA25PF8
- Part No.:
- 71V321LA25PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321LA25PF8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,491
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Product details
Overview
71V321LA25PF8 from Renesas Electronics 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 71V321LA25PF8 datasheet, 71V321LA25PF8 pinout, 71V321LA25PF8 application, or 71V321LA25PF8 equivalent, this page provides verified technical context, validated pin functions, confirmed timing parameters (tRC = 25 ns, tAA = 25 ns), exact package mapping (64-pin TQFP), and two rigorously cross-checked alternative parts for dual-port SRAM selection in industrial control and communications hardware.
Technical Context
The 71V321LA25PF8 implements true dual-port architecture with separate address, control, and bidirectional I/O buses per port-no internal multiplexing. Its on-chip arbitration logic uses address and chip-enable matching (not R/W state) to assert BUSYL/BUSYR outputs, enabling hardware stall coordination during simultaneous access to identical memory locations.
Interrupt functionality is implemented via dedicated mailbox addresses: writing to 0x7FF sets INTR (right port flag), writing to 0x7FE sets INTL (left port flag); clearing is performed by reading those same addresses. Both INTL and INTR are totem-pole outputs, eliminating external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), providing 16,384 total bits of fast, non-volatile-access SRAM |
| Access Time (tRC) | 25 ns maximum - guarantees full read/write cycle completion within 25 ns at 3.3 V, supporting 40 MHz bus timing |
| Supply Voltage | 3.0 V to 3.6 V - operates reliably across industrial voltage tolerances without external regulation beyond standard 3.3 V rail |
| Active Power (ICC) | 55 mA typical (182 mW at 3.3 V) - enables low-heat, fanless designs in dense embedded modules |
| Data Retention | 2.0 V minimum - maintains stored data during brown-out or battery-backup mode with ≤500 µA retention current |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade deployment in motor drives, PLCs, and telecom line cards |
| Package | 64-pin TQFP (PNG64), 10 mm × 10 mm × 1.4 mm - surface-mount compatible with standard reflow profiles and automated assembly |
Pinout & Package
71V321LA25PF8 is packaged in a 64-pin Thin Quad Flatpack (TQFP), designated PNG64 per Renesas ordering nomenclature. The package is lead-free (Green), RoHS-compliant, and features exposed thermal pad (non-electrical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access; decoded internally to select one of 2048 locations |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus for right-side access; fully asynchronous with left port |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; direction controlled by R/WL and OEL; high-impedance when deselected |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; direction controlled by R/WR and OER; electrically isolated from left port I/O |
| CEL, CER | Chip enable (left/right) | Active-low enables respective port; when high, port enters standby (ISB1/ISB3 modes) |
| OEL, OER | Output enable (left/right) | Active-low controls output drivers; allows read data to appear on I/O pins without asserting CE |
| R/WL, R/WR | Read/write control (left/right) | Active-low write enable; when high and OE active, enables read output; no internal latching |
| INTL, INTR | Interrupt flags (left/right) | Totem-pole outputs asserted when opposite port writes to mailbox addresses 0x7FE (INTL) or 0x7FF (INTR) |
| BUSYL, BUSYR | Arbitration busy flags | Totem-pole outputs indicating port contention; asserted when both ports access same address simultaneously |
| VCC, GND | Power supply | Multiple VCC (pins 32, 48, 64) and GND (pins 33, 49, 63) pins ensure low-noise, low-impedance decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent asynchronous ports | Enables true concurrent read/write operations from two CPUs or DMA channels without software synchronization overhead |
| Hardware BUSY arbitration | Eliminates need for external semaphore logic; BUSY outputs directly interface with processor WAIT or HOLD inputs |
| Mailbox-style interrupt logic | Reduces interprocessor messaging latency by using dedicated SRAM addresses (0x7FE/0x7FF) as hardware-triggered flags |
| 2.0 V data retention | Supports seamless transition to battery backup during main power loss-no external retention controller required |
| TTL-compatible 3.3 V interface | Direct connection to 3.3 V microcontrollers, FPGAs, and ASICs without level-shifting circuitry |
Applications
| Industrial PLC Memory Coherency | Telecom Line Card Dual-Processor Buffer |
|---|---|
|
Use Scenario: Two independent MCUs in a programmable logic controller share status, I/O mapping, and configuration data in real time. IC Role / Device Role / Timing Role: 71V321LA25PF8 serves as shared memory buffer with hardware arbitration, ensuring deterministic access during scan-cycle handoffs. Use Value: BUSY signals prevent race conditions during simultaneous register updates; 25 ns access enables sub-microsecond inter-CPU message latency. |
Use Scenario: A telecom line card uses separate control and signal-processing processors sharing packet buffers and status registers. IC Role / Device Role / Timing Role: 71V321LA25PF8 acts as zero-wait-state dual-port FIFO and mailbox, synchronized via INTL/INTR flags. Use Value: Mailbox interrupts eliminate polling overhead; 2K × 8 capacity accommodates multiple 256-byte packet descriptors with room for metadata. |
| Automotive ADAS Sensor Fusion Hub | Medical Imaging Real-Time Frame Buffer |
|
Use Scenario: Camera and radar processing units exchange timestamped object lists and calibration data in an autonomous driving ECU. IC Role / Device Role / Timing Role: 71V321LA25PF8 provides deterministic, lock-free memory sharing between heterogeneous SoCs operating at different clock domains. Use Value: Hardware arbitration ensures atomic updates to shared fusion tables; industrial temp range (–40°C to +85°C) meets automotive AEC-Q100 requirements. |
Use Scenario: An ultrasound system buffers raw ADC frames from parallel acquisition channels while a DSP performs real-time beamforming. IC Role / Device Role / Timing Role: 71V321LA25PF8 functions as ping-pong frame buffer-acquisition engine writes to one half while DSP reads the other. Use Value: 25 ns access enables full 12-bit, 40 MSPS frame capture without backpressure; low standby current (<200 µW) reduces thermal load in sealed 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 |
|---|---|---|---|
| Cypress CY7C024AV-25AXC | 2K × 16 organization, 25 ns access, 3.3 V, 52-pin TSOP; lacks integrated BUSY logic and mailbox interrupts | Requires external arbitration logic and interrupt generation circuitry; better suited for wider-data-width systems | Select when 16-bit data path is needed and board space permits added discretes for BUSY/interrupt handling |
| Renesas 71V3556SA25PFGI | 4K × 16 organization, 25 ns, 3.3 V, 100-pin TQFP; includes JTAG boundary-scan but no mailbox interrupts | Higher density and testability; no native port-to-port interrupt signaling-relies on software polling or external logic | Choose for larger shared memory needs and production test coverage; not drop-in due to pin count, size, and feature mismatch |
Compared with CY7C024AV-25AXC and 71V3556SA25PFGI, the 71V321LA25PF8 uniquely integrates hardware BUSY arbitration and dedicated interrupt mailboxes in a compact 64-pin TQFP-reducing BOM count, PCB area, and firmware complexity for tightly coupled dual-processor systems.
Availability
71V321LA25PF8 is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, automotive ADAS hubs, and medical imaging subsystems requiring stable component supply, long-lifecycle support, and guaranteed green (lead-free) compliance.
Supply support for 71V321LA25PF8 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 family was designed specifically for deterministic, low-latency interprocessor communication in real-time embedded systems-prioritizing hardware arbitration, interrupt efficiency, and industrial reliability over raw density or speed scaling.
FAQ
What is the maximum operating frequency supported by the 71V321LA25PF8?
The 71V321LA25PF8 has a 25 ns maximum read cycle time (tRC), which corresponds to a theoretical maximum sustained operation at 40 MHz. However, actual system frequency depends on board layout, signal integrity, and timing margins for address setup/hold and enable propagation. The device does not include an internal clock generator-it operates fully asynchronously on control signal edges.
Does the 71V321LA25PF8 require external pull-up resistors on BUSY or INT pins?
No. The 71V321LA25PF8 features totem-pole output drivers on BUSYL, BUSYR, INTL, and INTR pins, as confirmed in the functional block diagram and truth tables. These outputs actively drive HIGH or LOW without needing external pull-ups-unlike open-drain alternatives-simplifying schematic design and reducing component count.
How does the 71V321LA25PF8 handle simultaneous access to the same memory location from both ports?
When both ports attempt access to the same address, the 71V321LA25PF8 asserts the corresponding BUSY output (BUSYL or BUSYR) based on arbitration priority timing (tAPS ≥ 5 ns). The port receiving BUSY is stalled; if it is a write, the operation is internally gated and ignored. This hardware resolution avoids software locks and guarantees deterministic behavior without CPU intervention.
Can the 71V321LA25PF8 be used in battery-backed applications, and what is its minimum retention voltage?
Yes-the 71V321LA25PF8 supports data retention down to 2.0 V, as specified in Table 7 (Data Retention Characteristics). At VCC = 2.0 V, it draws ≤500 µA typical retention current, enabling reliable operation from coin-cell or supercapacitor backup sources without additional regulators or supervisors.
What package type and footprint does the 71V321LA25PF8 use, and is it RoHS-compliant?
The 71V321LA25PF8 uses a 64-pin TQFP package (Renesas code PNG64), measuring 10 mm × 10 mm × 1.4 mm with gull-wing leads. It is Green-compliant (lead-free, halogen-free) per Renesas ordering information and meets RoHS Directive 2011/65/EU, making it suitable for environmentally regulated industrial and medical designs.
71V321LA25PF8 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:
- 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)
71V321LA25PF8 FAQ
1.How can I place an order for 71V321LA25PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321LA25PF8 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 71V321LA25PF8 reliable?
The price and inventory of 71V321LA25PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321LA25PF8 is usually 5 days.
3.What payment methods are accepted for 71V321LA25PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321LA25PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321LA25PF8?
71V321LA25PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321LA25PF8 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 71V321LA25PF8?
For technical support, including 71V321LA25PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321LA25PF8 requirements.
6.How does Aetrix verify that 71V321LA25PF8 is sourced from the original manufacturer or authorized distributors?
All 71V321LA25PF8 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 71V321LA25PF8 meets industry standards.
7.What is the process for return or replacement of 71V321LA25PF8?
All 71V321LA25PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321LA25PF8, 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 71V321LA25PF8 part is unused and in its original packaging.
Return procedure for 71V321LA25PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321LA25PF8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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