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Renesas 71321LA25PF
- Part No.:
- 71321LA25PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321LA25PF.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,477
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Product details
Overview
IDT71321LA25PF from Integrated Device Technology is a high-speed 2K × 8 dual-port static RAM with interrupt logic and BUSY arbitration, designed as a MASTER device for interprocessor communication in real-time embedded systems. It delivers 25 ns max access time, supports TTL-compatible 5V ±10% supply, operates across –40°C to +85°C industrial temperature range, and enables battery-backed data retention at 2V - used in dual-CPU arbitration buffers and shared-memory co-processor interfaces.
For engineers reviewing the IDT71321LA25PF datasheet, IDT71321LA25PF pinout, IDT71321LA25PF application, or IDT71321LA25PF equivalent, key selection criteria include its MASTER-only arbitration logic, open-drain BUSYL/INTL outputs requiring 270Ω pull-ups, 2K×8 asynchronous dual-port architecture, and LA-series ultra-low standby current (1 µA typical full standby).
Technical Context
The IDT71321LA25PF implements fully independent left/right ports with separate address, control, and I/O buses, enabling true asynchronous read/write access to any memory location without internal contention. Its on-chip arbitration logic monitors CE and address signals (not R/W state) to assert BUSYL/BUSYR outputs when port-to-port address matches occur - critical for deterministic write-inhibit behavior in master/slave configurations.
Interrupt functionality uses dedicated mailbox addresses (7FEH for INTL, 7FFH for INTR) with edge-triggered flag assertion and software-clear capability. The LA variant integrates battery backup support: data retention at 2V with ≤100 µA ICCDR, while maintaining 25 ns access timing and 1 µA ISB3 full-standby current under CMOS-level inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit wide), dual-port SRAM with independent left/right address spaces |
| Access Time (max) | 25 ns - guarantees worst-case read latency for real-time deterministic response in industrial controllers |
| Supply Voltage | 5.0 V ±10% - compatible with standard TTL logic families and legacy 5V system rails |
| Standby Current (ISB3) | 1 µA typical - enables ultra-low-power operation during CPU idle cycles in battery-backed systems |
| Data Retention Voltage | 2.0 V minimum - preserves memory contents during main power loss using backup battery |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications without derating |
| Interrupt Mailbox Addresses | 7FEH (INTL set), 7FFH (INTR set) - fixed SRAM locations used for hardware-triggered interprocessor signaling |
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 decimal) |
| A0R–A10R | Right port address inputs | 11-bit address bus for right-side memory access; identical mapping to left port |
| 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 automatic power-down mode when deasserted |
| OEL / OER | Output enable (left/right) | Active-low enables data output drivers; overrides R/W state for tri-state control |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of I/O bus transfer |
| BUSYL / BUSYR | BUSY flag (output only) | Open-drain outputs requiring 270Ω pull-up; asserted low during port-to-port address conflict |
| INTL / INTR | Interrupt flags (output only) | Open-drain outputs requiring 270Ω pull-up; indicate mailbox writes to 7FEH/7FFH |
| VCC / GND | Power supply pins | Multiple VCC/GND pairs ensure stable noise margin and low-impedance return paths |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration logic | Hardware-based BUSY generation from CE + address match - eliminates need for external arbitration logic in multi-CPU designs |
| Dual interrupt mailbox architecture | Fixed 7FEH/7FFH SRAM locations trigger INTL/INTR flags - enables zero-latency interprocessor messaging without polling |
| Ultra-low standby power (LA version) | 1 µA ISB3 current with CMOS-level inputs - extends battery life in always-on backup memory applications |
| 2V data retention capability | Guaranteed memory hold at 2.0 V VCC - supports seamless transition to backup power without data loss |
| Master-only BUSY output configuration | BUSYL/BUSYR are open-drain outputs (not inputs) - defines strict MASTER role in IDT71321/IDT71421 width-expansion topologies |
Applications
| Industrial Dual-Processor PLCs | Military Avionics Shared Memory Buffers |
|---|---|
Use Scenario: Two independent CPUs share sensor data and control commands via a common memory space in a ruggedized programmable logic controller. IC Role / Device Role / Timing Role: IDT71321LA25PF acts as MASTER dual-port SRAM, providing deterministic BUSY arbitration and interrupt-driven mailbox signaling between ARM and DSP cores. Use Value: Eliminates software locks and polling overhead; 25 ns access ensures sub-microsecond inter-core message latency under worst-case contention. |
Use Scenario: Flight control computers require fault-tolerant, non-volatile shared memory for real-time telemetry exchange between redundant processing channels. IC Role / Device Role / Timing Role: IDT71321LA25PF serves as battery-backed dual-port buffer, retaining critical flight parameters during main power interruption. Use Value: 2V data retention and –40°C to +85°C operation guarantee memory integrity across extreme environmental conditions. |
| Medical Imaging Co-Processor Interfaces | Automotive ADAS Sensor Fusion Modules |
Use Scenario: FPGA-based image preprocessor and ARM application processor coordinate frame buffering and analysis in portable ultrasound equipment. IC Role / Device Role / Timing Role: IDT71321LA25PF provides asynchronous, lock-free memory access between FPGA DMA engine and CPU subsystem. Use Value: Independent left/right ports allow concurrent write (FPGA) and read (CPU) operations without pipeline stalls or bus turnaround delays. |
Use Scenario: Radar and camera processors exchange object detection metadata in autonomous driving ECUs with strict real-time deadlines. IC Role / Device Role / Timing Role: IDT71321LA25PF functions as interrupt-driven mailbox SRAM, synchronizing sensor fusion results via 7FEH/7FFH flags. Use Value: Hardware-triggered interrupts reduce CPU load by >90% versus polling-based inter-processor communication. |
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 CY7C136-25JC | 52-pin PLCC package; no built-in BUSY arbitration logic; requires external logic for port conflict resolution | Lacks native interrupt mailboxes and MASTER/SLAVE expansion support | Select when board layout favors PLCC or when external arbitration is already implemented |
| ISSI IS61LV25616AL-10TLI | Single-port, 256K × 16 organization; no dual-port or interrupt capability; 10 ns access | Not functionally equivalent - lacks dual-port, BUSY, or interrupt features entirely | Consider only for cost-sensitive, non-contention applications where interprocessor signaling is handled elsewhere |
Compared with CY7C136-25JC and IS61LV25616AL-10TLI, the IDT71321LA25PF uniquely integrates hardware arbitration and interrupt mailboxes in a single 52-pin STQFP package - reducing BOM count and PCB area while guaranteeing deterministic inter-CPU synchronization without firmware overhead.
Availability
IDT71321LA25PF is available at Aetrix Electronics and suitable for industrial PLCs, avionics data recorders, and medical imaging co-processors requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for IDT71321LA25PF 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 power solutions for communications and computing infrastructure.
The IDT71321LA25PF belongs to IDT's high-speed dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware arbitration and low-latency mailbox signaling are critical.
FAQ
What distinguishes IDT71321LA25PF from the SA version?
The IDT71321LA25PF is the low-power LA variant, featuring 1 µA typical full-standby current (ISB3) and guaranteed 2V data retention - unlike the SA version which lacks battery backup and draws 15 µA in full standby. Both share identical 25 ns access timing and pinout, but LA enables extended offline memory hold in power-fail scenarios.
Can IDT71321LA25PF operate as a SLAVE device in MASTER/SLAVE configurations?
No. The IDT71321LA25PF is exclusively a MASTER device: BUSYL and BUSYR are open-drain outputs only, and on-chip arbitration logic is present. For SLAVE operation, IDT71421LA25PF must be used - it accepts BUSY as an input and lacks internal arbitration circuitry.
What pull-up resistor value is required for BUSYL and INTL pins?
IDT71321LA25PF requires a 270Ω pull-up resistor on each open-drain BUSYL and INTL pin, as specified in the functional block diagram notes and AC test load figures. This value ensures proper voltage rise time and noise immunity while meeting VOL ≤ 0.5 V at 16 mA sink current.
How does interrupt clearing work in IDT71321LA25PF?
To clear the INTL flag in IDT71321LA25PF, the left port must perform a read or write access to address 7FEH with CEL = OEL = VIL (R/WL is don't-care). Similarly, INTR is cleared by accessing 7FFH from the right port with CER = OER = VIL - per Truth Table II in the datasheet.
Is IDT71321LA25PF pin-compatible with other speed grades like IDT71321LA35PF?
Yes. All IDT71321LA variants (20/25/35/55 ns) share identical 52-pin STQFP (PPG52) packaging and pinout. Speed grade differences affect only internal timing parameters - no PCB redesign is needed when upgrading or downgrading within the LA family.
71321LA25PF 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:
- 25ns
- Access Time:
- 25 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)
71321LA25PF FAQ
1.How can I place an order for 71321LA25PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321LA25PF 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 71321LA25PF reliable?
The price and inventory of 71321LA25PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321LA25PF is usually 5 days.
3.What payment methods are accepted for 71321LA25PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321LA25PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321LA25PF?
71321LA25PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321LA25PF 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 71321LA25PF?
For technical support, including 71321LA25PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321LA25PF requirements.
6.How does Aetrix verify that 71321LA25PF is sourced from the original manufacturer or authorized distributors?
All 71321LA25PF 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 71321LA25PF meets industry standards.
7.What is the process for return or replacement of 71321LA25PF?
All 71321LA25PF units undergo pre-shipment inspection (PSI). If there is an issue with 71321LA25PF, 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 71321LA25PF part is unused and in its original packaging.
Return procedure for 71321LA25PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321LA25PF Tags
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AT24C02C-XHM-T
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