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Renesas 71V321LA45PF
- Part No.:
- 71V321LA45PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321LA45PF.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,667
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Product details
Overview
71V321LA45PF from Renesas Electronics is a high-speed 3.3V 2K × 8 dual-port static RAM with on-chip interrupt logic and BUSY arbitration, designed for interprocessor communication in embedded control systems. It delivers 45 ns max access time, 325 mW typical active power, and 2 V data retention-enabling battery-backed operation in industrial automation and real-time data exchange applications.
For engineers reviewing the 71V321LA45PF datasheet, 71V321LA45PF pinout, 71V321LA45PF application, or 71V321LA45PF equivalent, this page provides verified functional identity, validated PLCC-52 pin mapping, confirmed dual-port arbitration behavior, and two technically documented alternative parts for memory co-design and supply continuity planning.
Technical Context
The 71V321LA45PF implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses-supporting simultaneous read/write operations to distinct memory locations. Its on-chip arbitration logic uses address and chip-enable matching (not R/W state) to assert BUSYL/BUSYR outputs, enabling hardware stall coordination between processors.
Interrupt functionality is implemented via dedicated mailbox addresses: INTL asserts when right port writes to 0x7FE; INTR asserts when left port writes to 0x7FF. Both flags are cleared by reading the same location with OE and CE asserted-requiring no external logic for basic inter-core signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), providing 16 KB total capacity accessible from either port |
| Access Time (max) | 45 ns-guarantees deterministic latency for real-time control loops operating up to ~22 MHz |
| Supply Voltage | 3.0–3.6 V-TTL-compatible single 3.3 V rail eliminates level-shifting requirements in modern digital systems |
| Data Retention | 2.0 V minimum-enables reliable backup from coin-cell batteries during main power loss |
| Operating Temperature | −40°C to +85°C-qualified for industrial environments including motor drives and PLCs |
| Standby Current (ISB3) | 0.2 mA typical-supports ultra-low-power sleep modes without external power gating |
| Package | 52-pin PLCC (PLG52)-surface-mount compatible with standard reflow profiles and legacy repair workflows |
Pinout & Package
71V321LA45PF is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC, package code PLG52) with 0.050″ lead pitch and .75″ × .75″ body size. The package supports both through-hole prototyping and surface-mount production assembly.
| 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 lines | 8-bit parallel interface supporting concurrent read/write with right port under arbitration |
| CEL, OEL, R/WL | Left port control signals | Chip enable, output enable, and read/write direction-fully independent from right port controls |
| BUSYL, INTL | Left port status outputs | BUSYL indicates address contention on left port; INTL is interrupt flag set by right-port write to 0x7FE |
| A0R–A10R | Right port address inputs | Independent 11-bit address space-enables true asymmetrical processor coupling |
| I/O0R–I/O7R | Right port bidirectional data lines | Electrically isolated I/O path prevents bus contention without external isolation logic |
| CER, OER, R/WR | Right port control signals | Functionally identical to left controls but with separate timing domains and arbitration inputs |
| BUSYR, INTR | Right port status outputs | BUSYR signals contention on right port; INTR asserts when left port writes to 0x7FF |
| VCC, GND | Power and ground | Multiple VCC and GND pins distributed across package for low-noise operation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration with BUSY outputs | Hardware-enforced mutual exclusion using address+CE match detection-eliminates software polling overhead in multi-CPU designs |
| Interprocessor interrupt mailbox | Dedicated 0x7FE (left flag) and 0x7FF (right flag) SRAM locations act as hardware-triggered message registers with automatic flag clearing |
| 2 V data retention mode | Enables seamless transition to battery backup without external voltage supervisors or power-switching circuitry |
| Totem-pole BUSY/INT outputs | No external pull-ups required-reduces BOM count and PCB area in space-constrained industrial modules |
| Industrial temperature qualification | Guaranteed operation from −40°C to +85°C-validates use in uncontrolled enclosures such as factory-floor HMIs and motor controllers |
Applications
| Industrial PLC Communication Hub | Real-Time Motion Controller |
|---|---|
|
Use Scenario: Two microcontrollers-one handling HMI updates, the other managing servo loop execution-share sensor data and command status via shared memory. IC Role / Device Role / Timing Role: Dual-port RAM acts as synchronized data bridge with hardware arbitration preventing race conditions during concurrent access. Use Value: 45 ns access time enables sub-50 µs inter-core handshaking, meeting hard real-time deadlines in motion profiling. |
Use Scenario: FPGA-based trajectory generator writes position setpoints to RAM while ARM Cortex-M7 reads and executes closed-loop PID calculations. IC Role / Device Role / Timing Role: Memory serves as deterministic, low-latency buffer between high-speed logic and deterministic control processor. Use Value: BUSY signal stalls FPGA writes during ARM reads-ensuring atomic parameter updates without software locks. |
| Redundant Power Supply Monitor | Legacy System Data Bridge |
|
Use Scenario: Primary and backup power management units exchange fault logs and status flags using shared memory with battery backup. IC Role / Device Role / Timing Role: Dual-port SRAM provides non-volatile, cross-domain data exchange with guaranteed integrity during brownouts. Use Value: 2 V data retention preserves critical event logs for 72+ hours on CR2032, satisfying industrial traceability requirements. |
Use Scenario: Integrating a modern ARM SoC into an aging 8-bit microcontroller system-using RAM as protocol-transparent data conduit. IC Role / Device Role / Timing Role: Acts as voltage-level-agnostic interface layer, decoupling timing domains of dissimilar processors. Use Value: Independent left/right control logic eliminates need for glue logic or custom ASICs in legacy upgrade paths. |
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-45AXC | 45 ns access, 2K × 16 organization, 3.3 V only, no built-in interrupt logic | Requires external logic for mailbox-style interprocessor signaling; wider data bus suits DSP interfaces | Select when 16-bit data path or higher density per chip is prioritized over integrated interrupt capability |
| Renesas 71V3556SA45PFGI | 45 ns, 8K × 16, TQFP-100, includes JTAG debug port and enhanced arbitration | Supports deeper memory hierarchies and debug visibility; larger footprint increases layout complexity | Choose for scalable multi-core systems requiring >16 KB shared memory and in-circuit debugging support |
Compared with CY7C024AV-45AXC and 71V3556SA45PFGI, the 71V321LA45PF offers the smallest footprint and lowest gate count for basic dual-CPU coordination-making it optimal for cost-sensitive, space-constrained industrial controllers where mailbox interrupts reduce firmware complexity.
Availability
71V321LA45PF is available at Aetrix Electronics and suitable for industrial PLCs, real-time motion controllers, redundant power monitors, and legacy system upgrades requiring stable component supply and long-term lifecycle support.
Supply support for 71V321LA45PF 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 automotive, industrial, and infrastructure markets.
The 71V321L series was developed to simplify interprocessor communication in deterministic embedded systems-delivering hardware arbitration and interrupt signaling within a compact, low-power SRAM architecture.
FAQ
What is the exact memory organization and access width of the 71V321LA45PF?
The 71V321LA45PF implements a 2K × 8-bit (2048 words × 8-bit) dual-port static RAM structure. Each port accesses the full 2048-word address space independently via its own 11-bit address bus (A0–A10), with 8-bit bidirectional I/O lines (I/O0–I/O7). This configuration supports byte-level data exchange between two processors without width conversion logic.
Does the 71V321LA45PF require external pull-up resistors on BUSY or INT pins?
No. The 71V321LA45PF features totem-pole output drivers on BUSYL, BUSYR, INTL, and INTR pins-confirmed in the Functional Block Diagram and Pin Configuration notes. These outputs drive actively high and low without external biasing, eliminating pull-up resistors and reducing component count in industrial PCB layouts.
How does the 71V321LA45PF handle simultaneous access to the same memory address?
When both ports attempt access to the same address, the 71V321LA45PF asserts BUSYL or BUSYR (but never both simultaneously) based on which port's address and CE signals stabilize first. The BUSY output gates internal write logic on the delayed port-preventing data corruption without software intervention. Timing is governed by tAPS (5 ns arbitration priority setup).
What are the valid interrupt mailbox addresses for the 71V321LA45PF and how are they cleared?
The 71V321LA45PF uses fixed SRAM addresses for interrupt signaling: writing to 0x7FE (hex) with CER/R/WR asserted sets INTL; writing to 0x7FF sets INTR. Flags are cleared by reading the same address with CEL/OEL (for INTL) or CER/OER (for INTR) asserted-no separate reset command is needed, and the memory location remains user-writable for message payload storage.
Is the 71V321LA45PF compatible with industrial temperature requirements?
Yes. The 71V321LA45PF is qualified for operation from −40°C to +85°C, as explicitly stated in the Recommended Operating Conditions table and Ordering Information section. This rating applies to all speed grades including the 45 ns variant, making it suitable for deployment in unheated factory environments and outdoor industrial enclosures.
71V321LA45PF 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:
- 45ns
- Access Time:
- 45 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)
71V321LA45PF FAQ
1.How can I place an order for 71V321LA45PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321LA45PF 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 71V321LA45PF reliable?
The price and inventory of 71V321LA45PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321LA45PF is usually 5 days.
3.What payment methods are accepted for 71V321LA45PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321LA45PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321LA45PF?
71V321LA45PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321LA45PF 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 71V321LA45PF?
For technical support, including 71V321LA45PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321LA45PF requirements.
6.How does Aetrix verify that 71V321LA45PF is sourced from the original manufacturer or authorized distributors?
All 71V321LA45PF 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 71V321LA45PF meets industry standards.
7.What is the process for return or replacement of 71V321LA45PF?
All 71V321LA45PF units undergo pre-shipment inspection (PSI). If there is an issue with 71V321LA45PF, 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 71V321LA45PF part is unused and in its original packaging.
Return procedure for 71V321LA45PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321LA45PF Tags
-
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
-
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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