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Renesas 71V321SA55PF
- Part No.:
- 71V321SA55PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71V321SA55PF.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,841
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Product details
Overview
71V321SA55PF 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 supports fully asynchronous access from independent left/right ports, delivers 55 ns read/write cycle time, operates across commercial temperature range (0°C to +70°C), and features TTL-compatible I/O with single 3.3V supply.
For engineers reviewing the 71V321SA55PF datasheet, 71V321SA55PF pinout, 71V321SA55PF application, or 71V321SA55PF equivalent, this page provides verified technical context, package mapping, real-world use scenarios, and validated alternative options for dual-port SRAM selection in real-time co-processor architectures.
Technical Context
The 71V321SA55PF implements hardware-based port arbitration via totem-pole BUSY outputs (BUSYL/BUSYR) that assert when both ports simultaneously access the same memory address-enabling deterministic conflict resolution without software overhead. Its interrupt logic uses dedicated mailbox addresses (7FEH for INTL, 7FFH for INTR) to signal cross-port events with ≤45 ns set/reset timing.
It supports battery-backed data retention down to 2.0V (L-version only), though the 'S' suffix in 71V321SA55PF confirms standard-power operation (typ. 55 mA dynamic current, 1.0 mA full standby). The device uses CMOS process technology and requires no external pull-ups on BUSY/INT lines due to internal totem-pole drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits = 16,384 bits), enabling byte-wide parallel data exchange between two processors. |
| Access Time | 55 ns max (tRC, tWC), defining minimum cycle interval for reliable read/write operations at full speed. |
| Supply Voltage | 3.0–3.6 V (nominal 3.3 V), ensuring compatibility with modern low-voltage digital logic families without level-shifting. |
| Operating Temperature | 0°C to +70°C (Commercial grade), suitable for industrial control panels, test equipment, and communications infrastructure. |
| Power Consumption | Typ. 55 mA active current (both ports), 1.0 mA full standby (ISB3), enabling efficient power management in always-on systems. |
| Interrupt Timing | tINS/tINR ≤ 45 ns, allowing rapid inter-processor signaling with minimal latency in time-critical firmware handshakes. |
| BUSY Arbitration Delay | tBDD ≤ 45 ns, guaranteeing fast detection and blocking of conflicting writes before memory corruption occurs. |
Pinout & Package
71V321SA55PF is packaged in a 64-pin TQFP (Thin Quad Flatpack), measuring 10 mm × 10 mm × 1.4 mm, with lead-free (Green) finish and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (0–2047 decimal); enables full 2K addressing. |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus for right-side access; allows concurrent reads/writes to different locations. |
| I/O0L–I/O7L | Left port bidirectional data bus | 8-bit parallel interface; direction controlled by R/WL and OEL; high-impedance when deselected. |
| I/O0R–I/O7R | Right port bidirectional data bus | Electrically isolated 8-bit bus; supports simultaneous independent data transfers with left port. |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; deassertion places port in low-power standby (ISB1–ISB4). |
| OEL / OER | Output enable (left/right) | Controls tri-state output drivers; allows shared bus usage without contention when disabled. |
| R/WL / R/WR | Read/write control (left/right) | Defines data flow direction per port; write asserted when LOW, read when HIGH (with OE enabled). |
| INTL / INTR | Interrupt flags (left/right) | Open-drain compatible (totem-pole), active-high signals indicating mailbox writes (7FEH/7FFH). |
| BUSYL / BUSYR | Arbitration busy flags (left/right) | Totem-pole outputs asserting LOW during address collision; used to stall contending port access. |
| VCC / GND | Power and ground | Multiple VCC pins require decoupling near package; all GND pins must be connected to common ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent asynchronous ports | Enables true parallel processor access without clock synchronization or arbitration firmware overhead. |
| Hardware BUSY arbitration | Prevents memory corruption by automatically gating writes on contested addresses using dedicated BUSY outputs. |
| Programmable interrupt mailboxes | Uses standard SRAM locations (7FEH, 7FFH) as user-defined message registers for lightweight inter-processor signaling. |
| Low-power standby modes | Four distinct ISB states (ISB1–ISB4) allow fine-grained power control per port based on CE/SE input levels. |
| TTL-compatible 3.3V I/O | Eliminates need for voltage translators when interfacing with legacy 3.3V microcontrollers and FPGAs. |
Applications
| Industrial PLC Co-Processor Interface | Real-Time Data Acquisition Buffer |
|---|---|
Use Scenario: Two microcontrollers-one handling motion control, another managing HMI-share sensor and actuator data via shared memory. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency inter-processor buffer; BUSY logic prevents race conditions during simultaneous register updates. Use Value: Enables deterministic response under 55 ns cycle time, eliminating polling delays and reducing firmware complexity in safety-critical loops. |
Use Scenario: High-speed ADC streams samples to one port while a DSP reads and processes batches from the other port. IC Role / Device Role / Timing Role: Serves as ping-pong memory buffer; interrupt flags signal full/empty status without CPU intervention. Use Value: Sustains continuous 18.2 MB/s throughput (55 ns × 8-bit), avoiding FIFO overflow in 1 MSPS+ acquisition systems. |
| Telecom Line Card Control Plane | Automotive ADAS Sensor Fusion Hub |
Use Scenario: Baseband processor and packet controller exchange configuration tables and status reports across redundant communication paths. IC Role / Device Role / Timing Role: Provides non-blocking memory access for control-plane messaging; INTL/INTR flags trigger immediate context switches. Use Value: Reduces inter-processor latency to ≤45 ns, meeting sub-100 µs response requirements for OAM&P traffic management. |
Use Scenario: Camera and radar processors write timestamped object lists into shared memory for fusion algorithm execution. IC Role / Device Role / Timing Role: Acts as deterministic data rendezvous point; BUSY arbitration ensures atomic updates to critical tracking structures. Use Value: Guarantees memory coherency across heterogeneous SoCs without cache coherency protocols or software locks. |
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-55AXC | 55 ns access, 2K × 16 organization, 3.3V, but lacks integrated BUSY arbitration logic and uses separate semaphore pins. | Requires external logic for collision detection; better suited for wider-data-width systems where 16-bit access is preferred. | Select when 16-bit bus width is required and external arbitration is acceptable; avoid if deterministic hardware BUSY is mandatory. |
| Renesas 71V3555SA55PFG | Same 64-pin TQFP package and 55 ns speed, but 8K × 8 organization and enhanced interrupt vector support (INT0/INT1). | Offers larger memory footprint and dual-interrupt capability for complex multi-threaded firmware designs. | Choose for scalability beyond 2K; verify PCB layout compatibility-pinout differs in address/data grouping despite identical footprint. |
Compared with CY7C024AV-55AXC and 71V3555SA55PFG, the 71V321SA55PF delivers unique on-die BUSY arbitration and mailbox-style interrupts in a compact 2K × 8 form factor-making it optimal for cost-sensitive, latency-critical dual-processor interfaces where minimal external components are required.
Availability
71V321SA55PF is available at Aetrix Electronics and suitable for industrial PLC co-processor interfaces, real-time data acquisition buffers, and telecom line card control planes requiring stable component supply and long-term production continuity.
Supply support for 71V321SA55PF 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 71V321SA55PF belongs to Renesas' legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware-enforced memory coherency is essential.
FAQ
What is the maximum operating frequency supported by the 71V321SA55PF?
The 71V321SA55PF does not specify a clock frequency-it is a fully asynchronous SRAM. Its performance is defined by timing parameters: 55 ns read cycle time (tRC) and 55 ns write cycle time (tWC), corresponding to a theoretical maximum sustained transfer rate of approximately 18.2 million operations per second per port under ideal conditions.
Does the 71V321SA55PF support battery backup for data retention?
No-the 'S' suffix in 71V321SA55PF denotes standard-power operation. Battery backup with 2.0V data retention is exclusive to 'L' versions (e.g., 71V321L55PF). The 71V321SA55PF draws typical active current of 55 mA and full standby current of 1.0 mA, optimized for main-supply-only systems.
How are the INTL and INTR interrupt flags triggered in the 71V321SA55PF?
In the 71V321SA55PF, INTL asserts when the right port writes to address 7FEH; INTR asserts when the left port writes to 7FFH. Both flags clear automatically upon reading the respective address with CE and OE asserted-no dedicated reset command is needed. Timing is guaranteed ≤45 ns (tINS/tINR).
Can the 71V321SA55PF be used in depth-expanded memory arrays?
Yes-when expanding depth (e.g., stacking multiple 71V321SA55PFs for larger capacity), the BUSY outputs must be externally ANDed because BUSY arbitration is per-device. Figure 3 in the datasheet shows routing for depth expansion; no modification to the 71V321SA55PF itself is required beyond proper CE decoding and BUSY logic gating.
What is the meaning of the 'PF' suffix in 71V321SA55PF?
The 'PF' in 71V321SA55PF is the package code denoting 64-pin TQFP (Thin Quad Flatpack), per Renesas ordering nomenclature. It corresponds to the PNG64 package type, with dimensions 10 mm × 10 mm × 1.4 mm and lead-free (Green) finish-confirmed in the official Orderable Part Information table.
71V321SA55PF 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:
- 55ns
- Access Time:
- 55 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)
71V321SA55PF FAQ
1.How can I place an order for 71V321SA55PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321SA55PF 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 71V321SA55PF reliable?
The price and inventory of 71V321SA55PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321SA55PF is usually 5 days.
3.What payment methods are accepted for 71V321SA55PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321SA55PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321SA55PF?
71V321SA55PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321SA55PF 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 71V321SA55PF?
For technical support, including 71V321SA55PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321SA55PF requirements.
6.How does Aetrix verify that 71V321SA55PF is sourced from the original manufacturer or authorized distributors?
All 71V321SA55PF 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 71V321SA55PF meets industry standards.
7.What is the process for return or replacement of 71V321SA55PF?
All 71V321SA55PF units undergo pre-shipment inspection (PSI). If there is an issue with 71V321SA55PF, 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 71V321SA55PF part is unused and in its original packaging.
Return procedure for 71V321SA55PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321SA55PF Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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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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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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