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Renesas 71321LA20PF8
- Part No.:
- 71321LA20PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321LA20PF8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,104
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Product details
Overview
IDT71321LA20PF8 from Integrated Device Technology is a high-speed 2K × 8 dual-port static RAM with interrupt and BUSY arbitration logic, designed as a MASTER device for interprocessor communication. It delivers 20 ns max read cycle time, 5V ±10% single-supply operation, industrial temperature range (–40°C to +85°C), and battery-backed data retention down to 2V - enabling use in fault-tolerant embedded control systems requiring concurrent access from two independent buses.
For engineers reviewing the IDT71321LA20PF8 datasheet, IDT71321LA20PF8 pinout, IDT71321LA20PF8 application, or IDT71321LA20PF8 equivalent, key selection criteria include its master-mode arbitration logic, dual-interrupt flag support (INTL/INTR), 2V data retention capability, open-drain BUSY output requiring 270Ω pull-up, and compatibility with 52-pin STQFP packaging for space-constrained industrial PCB layouts.
Technical Context
The IDT71321LA20PF8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses - permitting simultaneous read/write operations without internal contention detection on the same port. Its on-chip arbitration logic monitors CE and address signals (not R/W state) to assert BUSYL/BUSYR outputs when address matches occur across ports, blocking writes during conflict.
As a MASTER device, it features open-drain BUSY outputs (requiring external 270Ω pull-up), integrated interrupt mailbox at addresses 7FEh (left INT set) and 7FFh (right INT set), and automatic power-down via CE-driven standby modes - achieving 1 µA typical full-standby current (ISB3) under CMOS-level inputs at VCC = 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), dual-port SRAM with separate left/right address/control/I/O |
| Access Time (tRC) | 20 ns max - enables real-time interprocessor handshaking in <25 ns timing-critical systems |
| Data Retention Voltage | 2.0 V min - supports battery backup operation during main power loss in industrial controllers |
| Supply Voltage | 4.5 V to 5.5 V - TTL-compatible single 5V ±10% rail, no auxiliary supplies required |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications without derating |
| Standby Current (ISB3) | 0.2 µA typ. - ultra-low leakage in full CMOS standby mode with CE high and inputs at rail |
| Interrupt Address Map | INTL asserted on right-port write to 7FEh; INTR asserted on left-port write to 7FFh - software-accessible mailbox protocol |
Pinout & Package
Package: 52-pin STQFP (PPG52), 10 mm × 10 mm × 1.4 mm body, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (0–2047) |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access (0–2047) |
| 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 respective port; controls power-down entry/exit |
| OEL / OER | Output enable (left/right) | Active-low enables I/O drivers; overrides R/W for tristate control |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of I/O data flow |
| INTL / INTR | Interrupt flags (open-drain) | Asserted low on mailbox write; require external pull-up resistors |
| BUSYL / BUSYR | BUSY arbitration flags (open-drain) | Asserted low during address-match contention; require 270Ω pull-up per IDT spec |
| VCC / GND | Power supply pins | Multiple VCC/GND pairs ensure stable noise margin across high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| Master-mode arbitration logic | Hardware-based BUSY assertion on address match - eliminates need for external glue logic in multi-processor shared-memory designs |
| Dual interrupt mailbox | User-defined 8-bit message storage at 7FEh/7FFh - enables lightweight inter-core signaling without polling overhead |
| 2V data retention | Preserves memory contents during brown-out or battery-backup scenarios - critical for safety-critical logging and state recovery |
| Ultra-low ISB3 standby | 0.2 µA typical current with CMOS-level inputs - extends battery life in always-on monitoring subsystems |
| 52-pin STQFP package | 10 mm × 10 mm footprint with exposed thermal pad - supports high-density industrial PCB layouts and thermal management |
Applications
| Industrial PLC Backplane Interface | Avionics Dual-Channel Data Logger |
|---|---|
Use Scenario: Two independent microcontrollers share sensor data and control commands via a common memory buffer on a ruggedized backplane. IC Role / Device Role / Timing Role: IDT71321LA20PF8 acts as MASTER dual-port SRAM, providing atomic read/write access with hardware BUSY arbitration to prevent data corruption during simultaneous access. Use Value: Eliminates software semaphores and reduces inter-core latency to ≤20 ns, meeting IEC 61131-3 deterministic response requirements. |
Use Scenario: Redundant flight control computers log telemetry to shared memory while maintaining independent operation during partial failure. IC Role / Device Role / Timing Role: IDT71321LA20PF8 serves as fault-isolated message buffer with 2V data retention, preserving last-known-good state during power interruption. Use Value: Enables DO-254 compliance via hardware-enforced write inhibition and non-volatile state capture without external EEPROM. |
| Medical Imaging Real-Time Buffer | Automotive ADAS Sensor Fusion Hub |
Use Scenario: High-speed image acquisition FPGA streams pixel data to a DSP for real-time processing, requiring zero-wait-state memory sharing. IC Role / Device Role / Timing Role: IDT71321LA20PF8 provides concurrent 20 ns access from FPGA (left port) and DSP (right port), synchronized via INTL/INTR handshake. Use Value: Sustains >40 MB/s sustained throughput with deterministic interrupt latency (<25 ns), satisfying FDA Class II imaging timing constraints. |
Use Scenario: Radar and camera processors exchange pre-processed object lists in autonomous driving ECU, requiring lock-free memory coherency. IC Role / Device Role / Timing Role: IDT71321LA20PF8 operates as MASTER SRAM with BUSY arbitration, preventing race conditions during simultaneous radar/camera list updates. Use Value: Guarantees atomic mailbox updates at AEC-Q100 Grade 2 temperature range, reducing ASIL-B software verification burden. |
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 CY7C1371D-200BAXI | 3.3V core, 16-bit bus width, no built-in BUSY arbitration - requires external logic for contention resolution | Lacks native interrupt mailbox and 2V retention; suited for lower-power 3.3V systems without industrial temp requirement | Select only if migrating to 3.3V infrastructure and adding discrete arbitration logic is acceptable |
| ON Semiconductor NVSRAM NVRAM71321LA20PF8 | Same pinout and timing but adds nonvolatile shadow RAM - retains data indefinitely after power loss without battery | Higher cost and larger package; overqualified where battery backup suffices | Choose when permanent data persistence is required beyond 2V battery window, e.g., black-box recording |
Compared with CY7C1371D-200BAXI, IDT71321LA20PF8 delivers native hardware arbitration and 2V retention at 5V operation, reducing BOM count and simplifying design for industrial control. Versus NVRAM71321LA20PF8, it offers lower cost and smaller footprint where battery-backed retention meets system reliability targets.
Availability
IDT71321LA20PF8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, avionics data loggers, and medical imaging buffers requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for IDT71321LA20PF8 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, and RF solutions for communications and industrial markets.
IDT71321LA20PF8 belongs to the legacy IDT71321/71421 dual-port SRAM family, engineered specifically for deterministic interprocessor communication in real-time embedded systems requiring hardware-enforced memory coherency.
FAQ
What is the function of the BUSY pins on the IDT71321LA20PF8?
The BUSYL and BUSYR pins on the IDT71321LA20PF8 are open-drain outputs that signal address-contention events between ports. When both ports attempt access to the same memory location, the IDT71321LA20PF8 asserts the corresponding BUSY pin low to inhibit writes on the contending port. Each BUSY pin requires an external 270Ω pull-up resistor to VCC per IDT specification DSC-2691/17.
Does the IDT71321LA20PF8 support true dual-port concurrent read/write operations?
Yes, the IDT71321LA20PF8 supports fully asynchronous concurrent access: one port may read while the other writes, or both may read independently. However, simultaneous writes to the same address trigger BUSY arbitration to prevent corruption. The IDT71321LA20PF8 implements this at the hardware level using CE and address inputs - no R/W state evaluation is performed during arbitration.
How does the interrupt functionality work in the IDT71321LA20PF8?
The IDT71321LA20PF8 uses dedicated mailbox addresses: writing to 7FEh (hex) via the right port sets the INTL flag, and writing to 7FFh via the left port sets the INTR flag. Clearing is achieved by reading those addresses with OE active. Both INTL and INTR are open-drain outputs requiring pull-up resistors. This mechanism enables lock-free interprocessor signaling without software polling in the IDT71321LA20PF8.
What is the significance of the 'LA' suffix in IDT71321LA20PF8?
The 'LA' suffix in IDT71321LA20PF8 denotes the low-power, battery-backed variant - distinct from the 'SA' commercial version. It guarantees data retention down to 2.0 V VCC and achieves 0.2 µA typical full-standby current (ISB3) under CMOS-level inputs. This makes the IDT71321LA20PF8 suitable for applications requiring persistent memory state during main power interruption.
Can the IDT71321LA20PF8 be used as a SLAVE device in a master/slave configuration?
No, the IDT71321LA20PF8 is exclusively a MASTER device. It contains on-chip arbitration logic and open-drain BUSY outputs - features absent in SLAVE devices like the IDT71421. For slave functionality, the IDT71421LA20PF8 must be used, where BUSY pins serve as inputs to disable writes during contention. Mixing IDT71321LA20PF8 (MASTER) with IDT71421LA20PF8 (SLAVE) enables scalable 16-bit+ memory expansion without external logic.
71321LA20PF8 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:
- 20ns
- Access Time:
- 20 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)
71321LA20PF8 FAQ
1.How can I place an order for 71321LA20PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321LA20PF8 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 71321LA20PF8 reliable?
The price and inventory of 71321LA20PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321LA20PF8 is usually 5 days.
3.What payment methods are accepted for 71321LA20PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321LA20PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321LA20PF8?
71321LA20PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321LA20PF8 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 71321LA20PF8?
For technical support, including 71321LA20PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321LA20PF8 requirements.
6.How does Aetrix verify that 71321LA20PF8 is sourced from the original manufacturer or authorized distributors?
All 71321LA20PF8 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 71321LA20PF8 meets industry standards.
7.What is the process for return or replacement of 71321LA20PF8?
All 71321LA20PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321LA20PF8, 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 71321LA20PF8 part is unused and in its original packaging.
Return procedure for 71321LA20PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321LA20PF8 Tags
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AT24C02C-XHM-T
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