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Renesas 71V321L35JGI8
- Part No.:
- 71V321L35JGI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
71V321L35JGI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,988
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Product details
Overview
71V321L35JGI8 from Renesas Electronics (formerly IDT) is a high-speed, 3.3V, 2K × 8 dual-port static RAM with on-chip interrupt logic and BUSY arbitration for interprocessor communication. It features 35 ns max access time, 1 mW typical standby power, battery-backed data retention down to 2 V, and operates across –40°C to +85°C industrial temperature range in 52-pin PLCC package.
For engineers reviewing the 71V321L35JGI8 datasheet, 71V321L35JGI8 pinout, 71V321L35JGI8 application, or 71V321L35JGI8 equivalent, key selection criteria include dual-port asynchronous read/write timing, port-to-port interrupt flag behavior (INTL/INTR), BUSY arbitration response latency, and low-voltage data retention capability under battery backup.
Technical Context
The 71V321L35JGI8 implements fully independent left/right ports with separate address, control, and bidirectional I/O buses-enabling true concurrent access without internal arbitration delay. Its on-chip arbitration logic asserts BUSYL/BUSYR outputs when both ports attempt simultaneous access to the same memory location, gating writes on the contending side.
Interrupt functionality uses dedicated mailbox addresses (7FEH for INTL, 7FFH for INTR) to signal cross-port events; flags are set by write operations and cleared by read accesses to those locations. All control signals-including CE, OE, R/W, and BUSY-are TTL-compatible and driven as totem-pole outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits = 2048 words × 8-bit wide; supports byte-level parallel access per port |
| Access Time (max) | 35 ns - defines minimum read cycle time (tRC) for reliable data capture at full speed |
| Supply Voltage | 3.0 V to 3.6 V - single 3.3 V ±0.3 V rail; no auxiliary supplies required |
| Standby Current (typ) | 1 mW at 3.3 V - enables ultra-low-power hold mode during processor idle periods |
| Data Retention Voltage | 2.0 V minimum - preserves memory contents during main supply loss using backup battery |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Package | 52-pin PLCC (PLG52) - surface-mount, leaded, hermetically sealed ceramic body |
Pinout & Package
71V321L35JGI8 is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC, code PLG52), measuring approximately 19.05 mm × 19.05 mm × 4.32 mm, with J-lead configuration and moisture sensitivity level (MSL) 3 per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for left-side memory access (0–2047 decimal) |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; direction controlled by R/WL and OEL |
| CEL, OEL, R/WL | Left port control enables | Chip Enable, Output Enable, Read/Write select - all active-low |
| INTL, BUSYL | Left port status outputs | Interrupt flag (open-drain compatible) and BUSY indicator (totem-pole) |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus for right-side access |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated 8-bit data path with separate control |
| CER, OER, R/WR | Right port control enables | Functionally identical to left-side controls but electrically isolated |
| INTR, BUSYR | Right port status outputs | Interrupt flag and BUSY output - totem-pole, no pull-up required |
| VCC, GND | Power and ground | Multiple VCC pins (pins 21, 33, 47) and GND pins (pins 20, 32, 46) ensure low-noise supply distribution |
| NC | No-connect | Pins 12, 13, 24, 25, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45 - must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous operation | Enables real-time interprocessor communication without shared clock or software coordination |
| Hardware BUSY arbitration | Prevents data corruption during simultaneous access via automatic write-gating and deterministic priority resolution |
| Port-specific interrupt flags (INTL/INTR) | Reduces polling overhead by signaling cross-port events using dedicated SRAM mailbox addresses (7FEH/7FFH) |
| Battery-backed data retention | Maintains valid memory state at 2 V supply - critical for fail-safe systems during brownout or power-loss scenarios |
| Totem-pole BUSY/INT outputs | Eliminates need for external pull-up resistors, simplifying PCB layout and reducing BOM count |
Applications
| Industrial PLC Communication Module | Avionics Data Logger Interface |
|---|---|
Use Scenario: Two microcontrollers exchange sensor telemetry and control commands via shared memory in a ruggedized programmable logic controller. IC Role / Device Role / Timing Role: 71V321L35JGI8 serves as dual-access buffer with hardware arbitration, eliminating race conditions during concurrent read/write cycles. Use Value: 35 ns access time ensures sub-microsecond inter-CPU handshaking; BUSY logic prevents corrupted writes during transient load spikes. | Use Scenario: Flight data recorder captures timestamped avionics bus messages while simultaneously allowing ground maintenance system to query stored logs. IC Role / Device Role / Timing Role: 71V321L35JGI8 acts as non-blocking memory bridge between ARINC 429 receiver and diagnostic host interface. Use Value: Industrial temperature rating (–40°C to +85°C) and 2 V data retention guarantee integrity across extreme thermal cycles and emergency power loss. |
| Medical Imaging Frame Buffer | Automotive ADAS Sensor Fusion Hub |
Use Scenario: Real-time ultrasound image acquisition engine writes raw frames while display subsystem reads completed frames for rendering. IC Role / Device Role / Timing Role: 71V321L35JGI8 functions as ping-pong frame buffer with interrupt-driven synchronization between acquisition and display pipelines. Use Value: Independent left/right port timing allows continuous streaming without pipeline stalls; 1 mW standby power minimizes thermal load in compact enclosures. | Use Scenario: Radar and camera data streams are merged in an autonomous driving ECU before feeding neural network inference engines. IC Role / Device Role / Timing Role: 71V321L35JGI8 provides low-latency, deterministic memory sharing between heterogeneous sensor processors. Use Value: Hardware BUSY arbitration ensures deterministic worst-case latency (<30 ns tBDD) for safety-critical fusion decisions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C024AV-35AXC | 3.3 V, 2K × 16 organization; 35 ns access; 64-pin TQFP only | Wider data bus requires different PCB layout; no native 2K × 8 variant | Select when 16-bit data path aligns with host bus architecture and board space permits larger package |
| IS61LV25616AL-10TLI | 3.3 V, 256K × 16; 10 ns access; no BUSY/interrupt logic; 48-pin TSOP | Lacks hardware arbitration and interport signaling; higher density but functionally simpler | Choose for cost-sensitive, non-contention use cases where software-managed synchronization suffices |
Compared with CY7C024AV-35AXC and IS61LV25616AL-10TLI, the 71V321L35JGI8 uniquely delivers 2K × 8 dual-port operation with integrated BUSY arbitration and mailbox-style interrupts in a compact 52-pin PLCC-making it optimal for resource-constrained, safety-aware embedded systems requiring deterministic interprocessor coordination.
Availability
71V321L35JGI8 is available at Aetrix Electronics and suitable for industrial PLC communication modules, avionics data loggers, medical imaging frame buffers, automotive ADAS sensor fusion hubs, and ruggedized embedded controllers requiring stable component supply across extended lifecycle programs.
Supply support for 71V321L35JGI8 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The 71V321L35JGI8 belongs to Renesas' legacy dual-port SRAM product line-designed specifically for deterministic, low-latency interprocessor communication in real-time embedded systems where hardware arbitration and interrupt signaling are essential.
FAQ
What is the maximum operating temperature range for the 71V321L35JGI8?
The 71V321L35JGI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Recommended Operating Temperature and Supply Voltage" table (page 3 of the datasheet) and applies to all speed grades including the 35 ns version. The device maintains full functionality-including 35 ns access time and 1 mW standby current-across this full range without derating.
Does the 71V321L35JGI8 require external pull-up resistors on BUSY or INT pins?
No, the 71V321L35JGI8 does not require external pull-up resistors on BUSYL, BUSYR, INTL, or INTR pins. As stated in the Functional Block Diagram notes and Pin Configurations section, all BUSY and INT outputs are totem-pole drivers. This eliminates the need for external components and ensures fast, clean signal transitions without rise-time degradation.
How does the 71V321L35JGI8 handle simultaneous access to the same memory address from both ports?
When both ports attempt access to the same address, the 71V321L35JGI8 asserts the corresponding BUSY output (BUSYL or BUSYR) and gates the write signal on the contending port. The winning port proceeds normally; the losing port's write is internally inhibited. This behavior is defined in Truth Table I (page 12) and detailed in the "Busy Logic" section (page 13), ensuring deterministic arbitration without data corruption.
What memory address triggers the INTL interrupt flag on the 71V321L35JGI8?
The INTL interrupt flag on the 71V321L35JGI8 is asserted when the right port writes to memory address 7FEH (2046 decimal). As specified in the "Interrupts" section (page 13) and Truth Table II (page 12), this write must occur with CER = VIL and R/WR = VIL. The flag is cleared when the left port reads from 7FEH with CEL = OEL = VIL.
Is the 71V321L35JGI8 still in active production and supported by Renesas?
The 71V321L35JGI8 was discontinued per Renesas Product Discontinuation Notice PDN# SP-17-02, with last-time-buy expiring June 15, 2018. However, Aetrix Electronics maintains verified legacy inventory with full traceability and offers lifecycle availability coordination-including obsolescence forecasting and cross-reference guidance-for ongoing production programs relying on this part.
71V321L35JGI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- 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:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
71V321L35JGI8 FAQ
1.How can I place an order for 71V321L35JGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 71V321L35JGI8 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 71V321L35JGI8 reliable?
The price and inventory of 71V321L35JGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 71V321L35JGI8 is usually 5 days.
3.What payment methods are accepted for 71V321L35JGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 71V321L35JGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 71V321L35JGI8?
71V321L35JGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 71V321L35JGI8 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 71V321L35JGI8?
For technical support, including 71V321L35JGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 71V321L35JGI8 requirements.
6.How does Aetrix verify that 71V321L35JGI8 is sourced from the original manufacturer or authorized distributors?
All 71V321L35JGI8 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 71V321L35JGI8 meets industry standards.
7.What is the process for return or replacement of 71V321L35JGI8?
All 71V321L35JGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 71V321L35JGI8, 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 71V321L35JGI8 part is unused and in its original packaging.
Return procedure for 71V321L35JGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
71V321L35JGI8 Tags
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