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Renesas 71321SA35TF8
- Part No.:
- 71321SA35TF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321SA35TF8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,830
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Product details
Overview
71321SA35TF8 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 systems. It delivers 35 ns max read cycle time, operates on single 5V ±10% supply, supports industrial temperature range (–40°C to +85°C), and features open-drain BUSY/INT outputs requiring 270Ω pull-up resistors - used in real-time embedded control and multi-CPU data exchange applications.
For engineers reviewing the 71321SA35TF8 datasheet, 71321SA35TF8 pinout, 71321SA35TF8 application, or 71321SA35TF8 equivalent, key selection criteria include its MASTER arbitration capability, dual-interrupt flag support (INTL/INTR), 35 ns timing grade, 52-pin STQFP package, and compatibility with IDT71421 SLAVE devices for 16-bit+ memory expansion.
Technical Context
The 71321SA35TF8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port contention via BUSY signaling - asserting BUSYL/BUSYR outputs when address matches occur, with tBDD ≤ 35 ns delay to valid data after BUSY deassertion.
Interrupt functionality uses dedicated mailbox addresses (7FEH for INTL, 7FFH for INTR) triggered by cross-port writes; interrupt flags are cleared by reading those same locations. Power management includes four standby modes (ISB1–ISB4), with full CMOS-level standby current as low as 0.2 mA (typ.) in LA variants - though 71321SA35TF8 is SA-grade with 25 mA ISB1 (industrial).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), dual-access SRAM array with no refresh required |
| Max Read Cycle Time | 35 ns - defines minimum time between successive reads on same port |
| Supply Voltage | 4.5 V to 5.5 V - TTL-compatible single 5V rail; VCC pins must be decoupled per datasheet layout rules |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Standby Current (ISB1) | 25 mA (max, industrial) - power consumed when both ports disabled (CEL = CER = VIH) |
| Interrupt Mailbox Addresses | 7FEH (left INTL set), 7FFH (right INTR set) - user-defined 8-bit message storage locations |
| BUSY Output Type | Open-drain - requires external 270Ω pull-up resistor to VCC for proper logic level and timing |
Pinout & Package
71321SA35TF8 is packaged in 52-pin STQFP (PPG52), body size 10 mm × 10 mm × 1.4 mm, with exposed thermal pad. Pin 1 marked by dot; all VCC and GND pins require dedicated PCB routing per datasheet layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (000H–7FFH) |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; direction controlled by R/WL and OEL |
| R/WL, CEL, OEL | Left port control signals | Read/write enable, chip select, output enable - fully asynchronous operation |
| INTL, BUSYL | Left port interrupt & busy | INTL: open-drain interrupt flag; BUSYL: open-drain busy output (MASTER only) |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access (000H–7FFH) |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; direction controlled by R/WR and OER |
| R/WR, CER, OER | Right port control signals | Read/write enable, chip select, output enable - independent of left port timing |
| INTR, BUSYR | Right port interrupt & busy | INTR: open-drain interrupt flag; BUSYR: open-drain busy output (MASTER only) |
| VCC, GND | Power supply | Multiple VCC/GND pins - must be connected to minimize noise and ensure stable operation |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration logic | Resolves simultaneous access conflicts without external logic; asserts BUSY within 20 ns (tBAA) to block conflicting writes |
| Dual interrupt flags (INTL/INTR) | Hardware mailbox signaling enables lock-free interprocessor messaging using dedicated 7FEH/7FFH addresses |
| Master-only BUSY outputs | BUSYL/BUSYR drive open-drain LOW during contention - directly usable as write-inhibit for SLAVE devices in width-expanded systems |
| Four standby power modes | Supports dynamic power gating per port: ISB1 (both ports disabled), ISB2 (one active), ISB3/ISB4 (CMOS-level input hold) |
| 52-pin STQFP (PPG52) | Compact 10 mm × 10 mm footprint with thermal pad - optimized for high-density industrial PCB layouts |
Applications
| Real-Time Multi-CPU Control Systems | Industrial PLC Memory Expansion |
|---|---|
Use Scenario: Two microcontrollers share sensor data and actuator commands via shared memory without software locks or polling. IC Role / Device Role / Timing Role: 71321SA35TF8 acts as MASTER dual-port RAM with hardware arbitration, enabling deterministic <35 ns inter-processor data exchange. Use Value: Eliminates CPU stalls and race conditions; BUSY signaling ensures atomic write operations across ports without firmware overhead. | Use Scenario: PLC backplane requires expandable 16-bit memory for ladder logic execution and I/O mapping with deterministic latency. IC Role / Device Role / Timing Role: 71321SA35TF8 serves as MASTER in width-expanded configuration with IDT71421 SLAVE devices, delivering full-speed 16-bit access. Use Value: Enables error-free 16-bit word transfers without external glue logic; BUSY propagation maintains coherency across multiple SLAVE devices. |
| Avionics Data Acquisition Units | Medical Imaging Frame Buffers |
Use Scenario: Flight computer and sensor processing unit exchange telemetry and control packets in hard real-time safety-critical loops. IC Role / Device Role / Timing Role: 71321SA35TF8 provides interrupt-driven mailbox communication (INTL/INTR) with guaranteed 25 ns interrupt set/reset timing. Use Value: Reduces inter-processor latency below 50 ns; interrupt flags eliminate polling, freeing CPU cycles for computation. | Use Scenario: MRI subsystem buffers image frames between acquisition FPGA and display processor with zero-copy transfer. IC Role / Device Role / Timing Role: 71321SA35TF8 operates as standalone dual-port buffer - left port accepts raw pixel data, right port streams processed frames. Use Value: Asynchronous dual access prevents FIFO overflow; 35 ns access supports >28 MHz pixel clock rates in 8-bit mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT71421SA35TF8 | SLAVE-only device; BUSY pins are inputs, no arbitration logic, no INTL/INTR generation | Requires pairing with MASTER (e.g., 71321SA35TF8) for width expansion; cannot operate stand-alone as interrupt-capable memory | Select when building 16-bit+ arrays where 71321SA35TF8 handles arbitration and interrupts |
| Cypress CY7C136-35JC | 35 ns, 2K × 8 dual-port SRAM; no built-in interrupt logic or BUSY arbitration; separate interrupt controller needed | Lacks hardware mailbox and automatic port conflict resolution - requires external logic or firmware coordination | Choose for cost-sensitive designs where interrupt arbitration is handled in software or external ASIC |
Compared with IDT71421SA35TF8 and CY7C136-35JC, the 71321SA35TF8 uniquely integrates MASTER arbitration, dual interrupt flags, and open-drain BUSY outputs - enabling self-contained interprocessor communication without external logic or timing-critical firmware intervention.
Availability
71321SA35TF8 is available at Aetrix Electronics and suitable for real-time multi-CPU control systems, industrial PLC memory expansion, avionics data acquisition units, and medical imaging frame buffers requiring stable component supply and long-term industrial lifecycle support.
Supply support for 71321SA35TF8 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, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs for communications, computing, and industrial markets.
The IDT71321 product line was engineered specifically for deterministic interprocessor communication in resource-constrained embedded systems - delivering hardware-accelerated arbitration and interrupt signaling to replace software-managed shared memory protocols.
FAQ
What is the function of the BUSY pins on the 71321SA35TF8?
The BUSYL and BUSYR pins on the 71321SA35TF8 are open-drain outputs that assert LOW when port contention occurs - i.e., when both left and right ports attempt to access the same memory address simultaneously. This signal blocks writes on the losing port, ensuring data integrity. External 270Ω pull-up resistors to VCC are mandatory for correct voltage levels and timing compliance per datasheet Figure 3.
Can the 71321SA35TF8 operate as a standalone dual-port RAM without a SLAVE device?
Yes, the 71321SA35TF8 functions fully as a standalone 2K × 8 dual-port SRAM with interrupt and arbitration capabilities. It does not require pairing with an IDT71421 SLAVE device unless expanding data bus width beyond 8 bits. In standalone mode, both BUSYL and BUSYR serve as contention indicators, and INTL/INTR provide cross-port messaging without external components.
What are the exact mailbox addresses used for interrupt generation in the 71321SA35TF8?
The 71321SA35TF8 uses address 7FEH (2046 decimal) to set the left-port interrupt flag (INTL) and address 7FFH (2047 decimal) to set the right-port interrupt flag (INTR). Writing to these locations with the opposite port's chip and write-enable asserted triggers the respective flag; reading the same address clears it. These locations remain accessible as general SRAM when interrupts are unused.
Does the 71321SA35TF8 support battery backup data retention?
No, the 71321SA35TF8 is an SA-grade device and does not support battery backup data retention. Only LA-grade variants (e.g., 71321LA35TF8) guarantee 2V data retention with typical ICCDR ≤ 100 µA. The SA version requires continuous 4.5–5.5V supply for operation and retains no data below VCC minima.
What is the significance of the 'TF8' suffix in the 71321SA35TF8 part number?
The 'TF8' suffix in 71321SA35TF8 denotes the 52-pin STQFP (PPG52) package variant with industrial temperature range (–40°C to +85°C) and lead-free, RoHS-compliant finish. It distinguishes this version from PLCC (e.g., TF1), TQFP (e.g., TF2), and commercial-grade (e.g., TF0) variants - confirming mechanical compatibility and thermal qualification for harsh environments.
71321SA35TF8 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:
- 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 (10x10)
71321SA35TF8 FAQ
1.How can I place an order for 71321SA35TF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321SA35TF8 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 71321SA35TF8 reliable?
The price and inventory of 71321SA35TF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321SA35TF8 is usually 5 days.
3.What payment methods are accepted for 71321SA35TF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321SA35TF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321SA35TF8?
71321SA35TF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321SA35TF8 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 71321SA35TF8?
For technical support, including 71321SA35TF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321SA35TF8 requirements.
6.How does Aetrix verify that 71321SA35TF8 is sourced from the original manufacturer or authorized distributors?
All 71321SA35TF8 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 71321SA35TF8 meets industry standards.
7.What is the process for return or replacement of 71321SA35TF8?
All 71321SA35TF8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321SA35TF8, 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 71321SA35TF8 part is unused and in its original packaging.
Return procedure for 71321SA35TF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321SA35TF8 Tags
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