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Renesas 71321LA35PFI8
- Part No.:
- 71321LA35PFI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
71321LA35PFI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
IDT71321LA35PFI8 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 in real-time embedded systems. It delivers 35 ns max read cycle time, 2V battery-backed data retention, industrial temperature operation (–40°C to +85°C), and supports fully asynchronous dual-port access - used in avionics data buffers, industrial PLC memory coherency modules, and redundant controller synchronization circuits.
For engineers reviewing the IDT71321LA35PFI8 datasheet, IDT71321LA35PFI8 pinout, IDT71321LA35PFI8 application, or IDT71321LA35PFI8 equivalent, key selection criteria include its MASTER-only BUSY output behavior, 52-pin STQFP package compatibility, interrupt mailbox addressing at 7FEh/7FFh, and low-power LA-series standby current of 1 µA (full CMOS standby) - critical for battery-backed fail-safe memory designs.
Technical Context
The IDT71321LA35PFI8 implements on-chip port arbitration logic that asserts BUSYL/BUSYR outputs based solely on chip enable (CEL/CER) and address match timing - independent of R/W state - enabling deterministic contention resolution between two processors. Its interrupt generation is triggered by writes to dedicated SRAM addresses (7FEh for INTL, 7FFh for INTR), with set/reset timing validated at ≤45 ns (tINS/tINR).
As a MASTER-only device, it features open-drain BUSY outputs requiring 270 Ω pull-up resistors, while SLAVE devices (e.g., IDT71421) use those signals as write-inhibit inputs. The LA variant guarantees 2 V data retention with ICCDR ≤ 1.5 mA at +25°C, and operates across full 4.5–5.5 V supply range with TTL-compatible I/O levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), dual-port architecture enabling simultaneous read/write access from independent buses |
| Access Time (tRC) | 35 ns max - defines minimum read cycle interval; enables 28.6 MHz sustained throughput per port |
| Supply Voltage | 4.5 V to 5.5 V - supports standard 5 V ±10% industrial power rails without regulation overhead |
| Data Retention | 2 V minimum - allows backup from coin cell or supercapacitor during main power loss, preserving SRAM contents |
| Standby Current (ISB3) | 0.2 mA typ. (full CMOS standby) - enables ultra-low-power hold mode for battery-critical applications |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, transportation, and harsh-environment embedded use |
| Interrupt Latency | tINS ≤ 45 ns - ensures sub-50 ns flag assertion after mailbox write, supporting hard real-time inter-processor 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; supports full 2K address space |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus enabling concurrent access to same or different locations |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit TTL-compatible data path; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated data path; no internal bus contention between ports |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls automatic power-down into ISB1/ISB2/ISB3/ISB4 states |
| OEL / OER | Output enable (left/right) | Active-low enables data drivers; high-impedance when disabled, allowing bus sharing |
| R/WL / R/WR | Read/write control (left/right) | Defines direction: VIH = read, VIL = write; determines internal data path routing |
| BUSYL / BUSYR | Busy arbitration flags (output) | Open-drain outputs requiring external 270 Ω pull-up; indicate address contention to block writes |
| INTL / INTR | Interrupt flags (output) | Active-low open-drain outputs signaling mailbox writes (7FEh/7FFh); require pull-up for logic HIGH |
| VCC / GND | Power supply pins | Multiple VCC/GND pairs ensure stable core and I/O rail decoupling; all must be connected |
Key Features
| Feature | Design Value |
|---|---|
| On-chip arbitration logic | Resolves port contention deterministically using CE/address timing only - eliminates need for external priority encoder or glue logic |
| Dual interrupt mailboxes | Hardware-triggered INTL/INTR flags via dedicated SRAM addresses (7FEh/7FFh), enabling zero-software-latency inter-processor messaging |
| 2V data retention | Guaranteed memory hold at 2 V supply - supports seamless transition to battery backup without data loss or system reset |
| Industrial temperature grade | Validated operation from –40°C to +85°C - suitable for under-hood automotive, factory floor, and outdoor infrastructure deployments |
| 52-pin STQFP footprint | Compact 10 mm × 10 mm package with exposed thermal pad - enables high-density PCB layout while maintaining thermal performance |
Applications
| Avionics Data Buffering | Redundant Controller Synchronization |
|---|---|
Use Scenario: Dual-CPU flight management system exchanging telemetry and command packets via shared memory. IC Role / Device Role / Timing Role: MASTER IDT71321LA35PFI8 provides synchronized, contention-free access with BUSY arbitration and hardware interrupts. Use Value: Eliminates software polling delays; tINS ≤ 45 ns interrupt latency ensures sub-50 ns response to critical fault events. |
Use Scenario: Hot-standby industrial PLC pair maintaining identical state images with atomic updates. IC Role / Device Role / Timing Role: IDT71321LA35PFI8 acts as coherent memory bridge with 2V retention for state preservation during switchover. Use Value: ISB3 ≤ 0.2 mA standby current extends battery life >1 year; 35 ns access enables real-time state mirroring. |
| Medical Imaging Frame Store | Test Equipment Pattern Memory |
Use Scenario: MRI subsystem buffering raw sensor frames between acquisition FPGA and processing CPU. IC Role / Device Role / Timing Role: Dual-port SRAM serves as ping-pong buffer - one port writes frame N while other reads frame N−1. Use Value: Asynchronous operation prevents pipeline stalls; 35 ns tRC supports ≥28 MHz frame streaming without wait states. |
Use Scenario: Automated test equipment storing stimulus/response patterns for semiconductor wafer probing. IC Role / Device Role / Timing Role: IDT71321LA35PFI8 provides deterministic, glitch-free pattern access with BUSY-controlled write protection. Use Value: Hardware arbitration prevents corrupted pattern writes during concurrent debug access - eliminating firmware-level lock management. |
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 CY7C1371DV33-166BZI | 3.3 V supply, 166 MHz QDR interface, no BUSY arbitration logic, no interrupt mailboxes | Requires external arbitration logic and interrupt generation circuitry; suited for high-bandwidth cache, not real-time IPC | Select only if migrating to 3.3 V system with QDR bus and external control logic available |
| IDT71421LA35PFI8 | SLAVE-only variant; BUSY pins are inputs (not outputs); no on-chip arbitration logic; identical timing and retention | Must be paired with IDT71321LA35PFI8 in MASTER/SLAVE configuration for >8-bit bus expansion | Use only as companion SLAVE in 16-bit+ memory systems - not standalone replacement |
Compared with CY7C1371DV33-166BZI, IDT71321LA35PFI8 offers integrated hardware arbitration and interrupt signaling at 5 V, reducing BOM count and firmware complexity for real-time IPC; versus IDT71421LA35PFI8, it provides MASTER functionality essential for autonomous BUSY generation and system-level coordination.
Availability
IDT71321LA35PFI8 is available at Aetrix Electronics and suitable for avionics data buffering, redundant controller synchronization, and medical imaging frame storage requiring stable component supply, long-term lifecycle support, and industrial-grade reliability.
Supply support for IDT71321LA35PFI8 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 power management ICs for communications, computing, and industrial markets.
IDT71321LA35PFI8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in safety-critical and real-time embedded systems where hardware arbitration and low-latency signaling are mandatory.
FAQ
What is the function of BUSYL and BUSYR on IDT71321LA35PFI8?
BUSYL and BUSYR are open-drain arbitration outputs on IDT71321LA35PFI8 that signal address contention between ports. When asserted LOW, they inhibit writes to the corresponding port. Each requires a 270 Ω external pull-up resistor to VCC. These signals are generated solely from CE and address timing - not R/W state - ensuring deterministic resolution in real-time systems using IDT71321LA35PFI8.
Does IDT71321LA35PFI8 support battery backup operation?
Yes, IDT71321LA35PFI8 supports battery backup operation with guaranteed data retention at VCC = 2.0 V. In this mode, ICCDR is ≤1.5 mA (typical), enabling extended hold time from coin cells or supercapacitors. This feature is exclusive to LA variants and is validated per datasheet Table 6 - a key differentiator from SA versions and most competing dual-port SRAMs.
Can IDT71321LA35PFI8 be used as a SLAVE device in a MASTER/SLAVE configuration?
No, IDT71321LA35PFI8 is strictly a MASTER device. Its BUSY pins are outputs, and it contains on-chip arbitration logic - features absent in SLAVE devices like IDT71421LA35PFI8. Attempting to use IDT71321LA35PFI8 as a SLAVE will result in incorrect BUSY behavior and potential data corruption. For SLAVE functionality, IDT71421LA35PFI8 must be selected instead.
How are the interrupt flags INTL and INTR triggered on IDT71321LA35PFI8?
INTL is asserted when the right port writes to address 7FEh; INTR is asserted when the left port writes to address 7FFh - both defined in Truth Table II. Clearing requires reading the same address with OE and CE active. Timing is specified as tINS ≤ 45 ns (max), ensuring hard real-time responsiveness. These are hardware-generated flags; no firmware polling is needed for IDT71321LA35PFI8 interrupt handling.
What package type is used for IDT71321LA35PFI8?
IDT71321LA35PFI8 uses a 52-pin STQFP (PPG52) package measuring 10 mm × 10 mm × 1.4 mm. This lead-free, RoHS-compliant package features an exposed thermal pad and is distinct from the 64-pin TQFP variants. Pinout matches the PPG52 diagram in the datasheet (Figure 3a), with dedicated VCC/GND pairs for noise immunity - critical for stable operation in IDT71321LA35PFI8 applications.
71321LA35PFI8 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
71321LA35PFI8 FAQ
1.How can I place an order for 71321LA35PFI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71321LA35PFI8 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 71321LA35PFI8 reliable?
The price and inventory of 71321LA35PFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71321LA35PFI8 is usually 5 days.
3.What payment methods are accepted for 71321LA35PFI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71321LA35PFI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71321LA35PFI8?
71321LA35PFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71321LA35PFI8 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 71321LA35PFI8?
For technical support, including 71321LA35PFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71321LA35PFI8 requirements.
6.How does Aetrix verify that 71321LA35PFI8 is sourced from the original manufacturer or authorized distributors?
All 71321LA35PFI8 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 71321LA35PFI8 meets industry standards.
7.What is the process for return or replacement of 71321LA35PFI8?
All 71321LA35PFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71321LA35PFI8, 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 71321LA35PFI8 part is unused and in its original packaging.
Return procedure for 71321LA35PFI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71321LA35PFI8 Tags
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