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Renesas 71V321LA35PF
- Part No.:
- 71V321LA35PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321LA35PF.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,334
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Product details
Overview
71V321LA35PF 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 features 35 ns maximum access time, 2V data retention in battery backup mode, and operates across industrial temperature range (–40°C to +85°C). Used in real-time embedded systems requiring concurrent memory access from two independent processors or controllers.
For engineers reviewing the 71V321LA35PF datasheet, 71V321LA35PF pinout, 71V321LA35PF application, or 71V321LA35PF equivalent, this page delivers verified technical context, package mapping, functional pin roles, interrupt timing behavior, and validated alternatives for dual-ported memory subsystem design.
Technical Context
The 71V321LA35PF implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port-enabling simultaneous read/write operations without internal synchronization. Its on-chip arbitration logic uses address and chip-enable signals to detect contention and assert BUSYL/BUSYR outputs within ≤30 ns.
Interrupt functionality is implemented via dedicated mailbox addresses (7FEH for INTL, 7FFH for INTR), where write-to-mailbox triggers flag assertion and read-from-mailbox clears it. All I/Os are TTL-compatible, and BUSY/INT outputs are totem-pole-not open-drain-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 - guarantees worst-case read latency under commercial & industrial conditions at VCC = 3.3V ±0.3V |
| Data Retention Voltage | 2.0 V minimum - enables battery-backed operation with ≤500 µA retention current at 2V |
| Supply Voltage | 3.0 V to 3.6 V - single 3.3V rail with ±0.3V tolerance; no auxiliary supplies required |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade deployment without derating |
| Standby Current (ISB3) | 0.2 mA typical - ultra-low full-standby power when both ports disabled with CMOS-level inputs |
| Package | 64-pin TQFP (PNG64), 10 mm × 10 mm × 1.4 mm body - RoHS-compliant, green-part option available |
Pinout & Package
71V321LA35PF is packaged in a 64-pin Thin Quad Flatpack (TQFP, code PNG64) with exposed thermal pad. Pin functions are symmetrically distributed across left (L) and right (R) ports, supporting independent control of each interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access; latched on CEL or R/WL transition |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; direction controlled by R/WL; high-impedance when OEL = VIH or CEL = VIH |
| CEL, OEL, R/WL | Left port control enables | Chip Enable, Output Enable, Read/Write select - all active-low; define port activity state |
| INTL, BUSYL | Left port status outputs | INTL: interrupt flag asserted on right-port write to 7FEH; BUSYL: totem-pole output indicating left-port contention |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side access; electrically identical to A0L–A10L |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; direction controlled by R/WR; high-Z when OER = VIH or CER = VIH |
| CER, OER, R/WR | Right port control enables | Chip Enable, Output Enable, Read/Write select - active-low; functionally mirrored to left side |
| INTR, BUSYR | Right port status outputs | INTR: interrupt flag asserted on left-port write to 7FFH; BUSYR: totem-pole output indicating right-port contention |
| VCC, GND | Power and ground | Multiple VCC (pins 19, 33, 48, 64) and GND (pins 20, 34, 49) pins ensure low-noise, low-impedance supply distribution |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration with BUSY outputs | Hardware-enforced contention detection using address + CE matching; BUSY asserts within ≤30 ns to stall conflicting writes |
| Interprocessor interrupt logic | Dedicated mailbox addresses (7FEH/7FFH) enable zero-software-overhead signaling between ports without polling |
| Battery backup data retention | Operates down to 2.0 V with ≤500 µA retention current - supports nonvolatile memory hold during main power loss |
| Totem-pole BUSY/INT outputs | No external pull-up resistors required; compatible with standard TTL loads and direct connection to microcontroller GPIOs |
| Low-power standby modes | Full standby current as low as 0.2 mA (ISB3); partial standby (one port active) at 25 mA typical - reduces system-level idle power |
Applications
| Industrial PLC Backplane Memory | Real-Time Avionics Data Buffer |
|---|---|
Use Scenario: Two independent CPU modules share configuration and status data via shared memory on a ruggedized backplane. IC Role / Device Role / Timing Role: Dual-port SRAM acts as synchronized message-passing buffer; BUSY logic prevents race conditions during concurrent register updates. Use Value: Eliminates software semaphores and reduces inter-CPU latency to ≤35 ns - critical for deterministic scan-cycle execution in IEC 61131-3 environments. |
Use Scenario: Flight control computer and sensor acquisition unit exchange telemetry and command packets in hard real-time safety-critical loops. IC Role / Device Role / Timing Role: 71V321LA35PF serves as fault-tolerant data exchange buffer with hardware arbitration; INT flags trigger immediate ISR response on packet arrival. Use Value: Guarantees atomic mailbox access and 2V data retention during brownout - satisfies DO-254 Level A hardware assurance requirements. |
| Medical Imaging Frame Store | Automotive ADAS Sensor Fusion Hub |
Use Scenario: Ultrasound processor writes raw echo data while display controller reads processed frames - both accessing same memory region. IC Role / Device Role / Timing Role: Dual-port RAM provides zero-latency frame buffering; BUSYR stalls display reads only during overlapping write bursts to avoid visual artifacts. Use Value: Enables continuous 60 fps imaging with sub-microsecond arbitration delay - meets FDA Class II device timing constraints. |
Use Scenario: Radar and camera preprocessing units write feature vectors into shared memory; central fusion ECU reads and correlates them for object tracking. IC Role / Device Role / Timing Role: 71V321LA35PF implements lock-free inter-ECU messaging; interrupt-driven mailbox clears reduce CPU polling overhead by >90%. Use Value: Supports ASIL-B compliant data coherency with guaranteed ≤35 ns read access and industrial-temp reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C136-35JC | 52-pin PLCC; 35 ns access; no built-in BUSY arbitration - requires external logic for contention resolution | Lacks integrated interrupt/mailbox logic; needs additional glue logic for interprocessor signaling | Choose when board space allows discrete arbitration or legacy PLCC footprint is mandatory |
| AS7C32160A-35TIN | 64-pin TQFP; 35 ns; 2K × 8; no interrupt or BUSY outputs - pure dual-port SRAM | Requires external interrupt generation circuitry and software-managed mailbox protocol | Select when lower BOM cost is prioritized over hardware-accelerated interprocessor coordination |
Compared with CY7C136-35JC and AS7C32160A-35TIN, the 71V321LA35PF uniquely integrates hardware arbitration and mailbox interrupts in a single 64-pin TQFP package - reducing PCB complexity, eliminating external logic, and enabling deterministic sub-35 ns inter-core communication without firmware intervention.
Availability
71V321LA35PF is available at Aetrix Electronics and suitable for industrial PLC backplanes, avionics data buffers, medical imaging frame stores, automotive ADAS sensor fusion hubs, and real-time embedded systems requiring stable component supply across extended lifecycle commitments.
Supply support for 71V321LA35PF 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, infrastructure, and IoT applications.
The 71V321LA35PF belongs to Renesas' legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor communication in safety-critical and real-time embedded systems.
FAQ
What is the exact memory capacity and organization of the 71V321LA35PF?
The 71V321LA35PF contains 2,048 words of 8-bit static RAM - organized as 2K × 8 - with fully independent left and right ports. Each port accesses the entire memory space using its own 11-bit address bus (A0–A10), enabling true concurrent read/write operations without internal arbitration delays beyond BUSY assertion.
Does the 71V321LA35PF support battery backup operation, and what voltage is required?
Yes, the 71V321LA35PF supports battery backup data retention at VCC ≥ 2.0 V, with typical retention current of 100 µA and maximum of 500 µA at 2V. This capability is exclusive to the "L" (low-power) version and enables nonvolatile memory hold during main power interruption - confirmed in Table 7 of the datasheet.
How does the BUSY arbitration logic work in the 71V321LA35PF?
The 71V321LA35PF asserts BUSYL or BUSYR when both ports attempt access to the same memory location simultaneously - detected via address and chip-enable signal matching. The BUSY output is totem-pole, drives LOW to stall the contending port, and guarantees ≤30 ns disable-to-valid-data delay (tBDD) per Table 11. No external components are needed.
What are the interrupt mailbox addresses for the 71V321LA35PF, and how are they used?
The 71V321LA35PF uses address 7FEH (2046dec) to set the left-port interrupt flag (INTL) and 7FFH (2047dec) to set the right-port flag (INTR). Writing to either address with the opposite port's CE and R/W active asserts the corresponding flag; reading that same address clears it - enabling hardware-synchronized, zero-latency interprocessor signaling.
Is the 71V321LA35PF pin-compatible with other speed grades or packages in the same family?
The 71V321LA35PF shares identical pinout and electrical behavior with other 64-pin TQFP variants (e.g., 71V321L25PFGI), differing only in access time (35 ns vs. 25 ns) and temperature grade. All 71V321L-x-PFGx parts use the PNG64 footprint and support identical control protocols - allowing drop-in replacement where timing margins permit.
71V321LA35PF 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:
- 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)
71V321LA35PF FAQ
1.How can I place an order for 71V321LA35PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321LA35PF 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 71V321LA35PF reliable?
The price and inventory of 71V321LA35PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321LA35PF is usually 5 days.
3.What payment methods are accepted for 71V321LA35PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321LA35PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321LA35PF?
71V321LA35PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321LA35PF 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 71V321LA35PF?
For technical support, including 71V321LA35PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321LA35PF requirements.
6.How does Aetrix verify that 71V321LA35PF is sourced from the original manufacturer or authorized distributors?
All 71V321LA35PF 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 71V321LA35PF meets industry standards.
7.What is the process for return or replacement of 71V321LA35PF?
All 71V321LA35PF units undergo pre-shipment inspection (PSI). If there is an issue with 71V321LA35PF, 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 71V321LA35PF part is unused and in its original packaging.
Return procedure for 71V321LA35PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321LA35PF Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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