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Renesas 71321SA35PF
- Part No.:
- 71321SA35PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321SA35PF.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,668
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Product details
Overview
IDT71321SA35PF from Integrated Device Technology is a high-speed 2K × 8 dual-port static RAM with interrupt logic and on-chip arbitration, designed as a MASTER device for interprocessor communication. It delivers 35 ns max read cycle time, operates at 5V ±10%, supports industrial temperature range (–40°C to +85°C), and features open-drain BUSY/INT outputs requiring 270 Ω pull-up resistors - used in real-time embedded control systems requiring concurrent memory access.
For engineers reviewing the 71321SA35PF datasheet, 71321SA35PF pinout, 71321SA35PF application, or 71321SA35PF equivalent, key selection criteria include its master-mode arbitration logic, dual-interrupt flag support (INTL/INTR), BUSY output timing (tBAA ≤ 30 ns), and compatibility with IDT71421SLAVE devices in 16-bit+ width expansions.
Technical Context
The 71321SA35PF implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port contention using chip-enable and address-match detection - asserting BUSYL/BUSYR outputs when both ports access the same address, with tAPS = 5 ns priority setup time.
Interrupt functionality uses dedicated mailbox addresses: INTL asserts on right-port write to 0x7FE; INTR asserts on left-port write to 0x7FF. Both flags are cleared by reading the respective address with OE enabled - enabling lock-free inter-processor signaling without software polling overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), 16 kbit total capacity |
| Max Read Cycle Time | 35 ns - defines minimum clock period for synchronous bus interfaces |
| Supply Voltage | 5.0 V ±10% - requires single TTL-compatible rail; no separate I/O voltage needed |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control environments |
| Active Current (Typ) | 80 mA - corresponds to ~400 mW dynamic power at 5 V |
| Standby Current (ISB1) | 25 mA (TTL-level inputs) - enables low-power idle states during processor wait cycles |
| BUSY Access Time | tBAA ≤ 30 ns - determines worst-case latency for hardware arbitration response |
| Interrupt Set Time | tINS ≤ 25 ns - guarantees sub-30 ns notification of cross-port mailbox writes |
Pinout & Package
71321SA35PF is packaged in 52-pin STQFP (PPG52), measuring 10 mm × 10 mm × 1.4 mm, with exposed pad for thermal dissipation and 0.5 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left-port address inputs | 11-bit address bus for left-side memory access (0x000–0x7FF) |
| A0R–A10R | Right-port address inputs | 11-bit address bus for right-side memory access (0x000–0x7FF) |
| I/O0L–I/O7L | Left-port bidirectional data | 8-bit data path; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right-port bidirectional data | 8-bit data path; high-impedance when OER = VIH or CER = VIH |
| CEL / CER | Chip enable (left/right) | Active-low enables port access and disables internal circuitry for standby current reduction |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers; allows read-only mode while keeping port active |
| R/WL / R/WR | Read/write control (left/right) | Active-low initiates write; high enables read - decouples data direction from CE timing |
| INTL / INTR | Interrupt flags (open drain) | Asserted low on mailbox writes (0x7FE/0x7FF); require external 270 Ω pull-up |
| BUSYL / BUSYR | Arbitration busy flags (open drain) | Asserted low during address contention; inhibit writes on respective port |
| VCC / GND | Power supply pins | Multiple VCC/GND pairs ensure stable core voltage under fast switching transients |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration logic | Resolves simultaneous access to same address without external logic; eliminates race conditions in dual-CPU systems |
| Dual interrupt mailbox addressing | Hardware-triggered INTL/INTR flags via dedicated SRAM locations (0x7FE/0x7FF), enabling zero-latency inter-processor signaling |
| Open-drain BUSY/INT outputs | Support wired-OR expansion across multiple MASTER/SLAVE arrays - simplifies system-level BUSY bus design |
| Asynchronous dual-port operation | Independent left/right timing allows mismatched CPU clock domains (e.g., ARM + DSP) to share memory without synchronization overhead |
| Industrial temperature qualification | Guaranteed 35 ns performance across –40°C to +85°C - suitable for motor drives, PLCs, and transportation electronics |
| Low-power standby modes | ISB1 = 25 mA (TTL inputs) and ISB3 = 1.0 mA (CMOS inputs) reduce system power during idle periods |
Applications
| Real-Time Dual-CPU Communication | Industrial Motion Controller Buffer |
|---|---|
|
Use Scenario: Two microcontrollers exchange status and command data through shared memory without software locks or polling. IC Role / Device Role / Timing Role: MASTER dual-port RAM provides hardware-arbitrated concurrent access with BUSY-driven write inhibition and interrupt-based event signaling. Use Value: Eliminates CPU stalls and software mutex overhead; 35 ns arbitration ensures deterministic response in <100 µs control loops. |
Use Scenario: A motion controller's FPGA (right port) streams position setpoints into RAM while a safety MCU (left port) reads and validates them before actuation. IC Role / Device Role / Timing Role: Dual-port buffer isolates real-time I/O domain from safety-critical processing domain with hardware-enforced coherency. Use Value: Prevents data corruption during simultaneous access; BUSY assertion guarantees atomic updates of multi-word trajectory segments. |
| Automotive ADAS Sensor Fusion Hub | Medical Imaging Data Pipeline |
|
Use Scenario: Radar and camera processors write timestamped sensor frames into shared memory for fusion algorithm execution on a central SoC. IC Role / Device Role / Timing Role: High-speed 35 ns interface synchronizes heterogeneous sensor data ingestion with minimal latency skew. Use Value: Enables frame-aligned processing across domains; interrupt flags signal completion without CPU intervention, reducing SoC load. |
Use Scenario: An ultrasound front-end ASIC (right port) streams raw echo data into RAM while a DSP (left port) performs beamforming in real time. IC Role / Device Role / Timing Role: Asynchronous dual-port architecture absorbs bursty ADC output and steady DSP consumption rates. Use Value: Prevents FIFO overflow or underflow; 2K × 8 depth buffers one full scan line at typical clinical frame rates. |
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 CY7C1371DV33 | 3.3 V core, 25 ns access, QDR interface; no native BUSY arbitration logic | Requires external logic for contention resolution; suited for high-bandwidth cache-like use, not interprocessor signaling | Select only if migrating to 3.3 V systems and adding custom arbitration; not drop-in compatible |
| ISSI IS61WV20488BLL | Single-port, 55 ns, 3.3 V; no interrupt or BUSY features | Lacks hardware inter-processor coordination - forces software-managed semaphores and polling | Acceptable only for non-concurrent access scenarios where latency tolerance exceeds 50 ns |
Compared with CY7C1371DV33 and IS61WV20488BLL, the 71321SA35PF uniquely integrates master-mode arbitration and dual interrupt mailboxes - eliminating external glue logic and reducing firmware complexity in tightly coupled dual-CPU architectures.
Availability
71321SA35PF is available at Aetrix Electronics and suitable for industrial motion controllers, automotive ADAS sensor hubs, and medical imaging pipelines requiring stable component supply with guaranteed long-term availability.
Supply support for 71321SA35PF 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
Integrated Device Technology (IDT), now part of Renesas Electronics, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.
The IDT71321 family was engineered specifically for deterministic interprocessor communication in real-time embedded systems - delivering hardware-enforced memory coherency and low-latency signaling without software overhead.
FAQ
What is the function of the BUSY pins on the 71321SA35PF?
The BUSYL and BUSYR pins on the 71321SA35PF are open-drain outputs that assert low when both ports attempt to access the same memory address simultaneously. This signal inhibits writes on the affected port, preventing data corruption. External 270 Ω pull-up resistors are required per datasheet specification. The 71321SA35PF uses this hardware arbitration instead of software locks, ensuring deterministic behavior in dual-CPU systems.
How does interrupt handling work in the 71321SA35PF?
The 71321SA35PF implements hardware interrupts via two dedicated mailbox addresses: writing to 0x7FE sets the INTL flag (signaling the left port), and writing to 0x7FF sets the INTR flag (signaling the right port). Each flag is cleared by reading its respective address with OE enabled. This enables zero-software-overhead interprocessor signaling - critical for real-time systems where polling would introduce latency jitter. The 71321SA35PF guarantees tINS ≤ 25 ns interrupt assertion time.
Can the 71321SA35PF operate with a 3.3 V supply?
No, the 71321SA35PF requires a 5.0 V ±10% supply (4.5 V to 5.5 V) and is not rated for 3.3 V operation. Its input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and internal circuitry are designed for TTL-compatible logic levels. Attempting 3.3 V operation risks functional failure or excessive leakage. For 3.3 V dual-port SRAM alternatives, consider Cypress CY7C1371DV33 - but note it lacks the 71321SA35PF's integrated BUSY arbitration and interrupt mailboxes.
What package type is used for the 71321SA35PF?
The 71321SA35PF is supplied in a 52-pin STQFP (Small Thin Quad Flat Package), also designated PPG52, with dimensions of 10 mm × 10 mm × 1.4 mm and 0.5 mm lead pitch. This RoHS-compliant package includes an exposed thermal pad for enhanced heat dissipation in industrial applications. Pinout matches the PLCC variant electrically but offers improved thermal and mechanical reliability for surface-mount assembly.
Is the 71321SA35PF pin-compatible with the IDT71421SLAVE device?
No, the 71321SA35PF is not pin-compatible with the IDT71421SLAVE. While both share identical pin counts and physical footprints in matching packages (e.g., PPG52), their BUSY pin functions differ fundamentally: BUSYL/BUSYR are open-drain outputs on the 71321SA35PF (MASTER), but inputs on the IDT71421SLAVE. Swapping them without redesigning the BUSY routing and pull-up configuration will cause functional failure. The 71321SA35PF and IDT71421SLAVE are intended for complementary roles in width-expanded systems, not direct substitution.
71321SA35PF 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
71321SA35PF FAQ
1.How can I place an order for 71321SA35PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321SA35PF 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 71321SA35PF reliable?
The price and inventory of 71321SA35PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321SA35PF is usually 5 days.
3.What payment methods are accepted for 71321SA35PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321SA35PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321SA35PF?
71321SA35PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321SA35PF 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 71321SA35PF?
For technical support, including 71321SA35PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321SA35PF requirements.
6.How does Aetrix verify that 71321SA35PF is sourced from the original manufacturer or authorized distributors?
All 71321SA35PF 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 71321SA35PF meets industry standards.
7.What is the process for return or replacement of 71321SA35PF?
All 71321SA35PF units undergo pre-shipment inspection (PSI). If there is an issue with 71321SA35PF, 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 71321SA35PF part is unused and in its original packaging.
Return procedure for 71321SA35PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321SA35PF Tags
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