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Renesas 70V05L55J
- Part No.:
- 70V05L55J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
70V05L55J.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,530
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Product details
Overview
70V05L55J from IDT (now Renesas) is a high-speed 3.3V 8K × 8 dual-port static RAM with true independent left/right ports, 55 ns maximum access time, industrial temperature range (–40°C to +85°C), and integrated semaphore/arbiter logic - used in real-time inter-processor communication, video frame buffers, and FPGA co-processor memory interfaces.
For engineers reviewing the 70V05L55J datasheet, 70V05L55J pinout, 70V05L55J application, or 70V05L55J equivalent, key selection considerations include port arbitration timing (tAPS = 0 ns min), BUSY flag behavior under address contention, 3.3V-only supply compatibility, and TQFP-64 package footprint for space-constrained embedded control systems.
Technical Context
The 70V05L55J implements fully asynchronous dual-port operation with separate address, data, and control buses per port, enabling simultaneous read/write access to the same memory location only when BUSY arbitration permits. Its on-chip hardware semaphore logic supports eight independent flags addressed via A0–A2, with dedicated SEM pins and interrupt generation (INTL/INTR).
Port arbitration uses either address-match timing (tAPS) or CE-edge timing (tBAC/tBDC) to resolve contention; BUSYL/BUSYR operate as push-pull outputs in MASTER mode (M/S = VIH) and inputs in SLAVE mode (M/S = VIL), directly gating write operations during conflict without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8 bits (64 Kbit total), dual-port SRAM with independent left/right address/data/control paths |
| Access Time (tAA) | 55 ns max - guarantees valid data at I/O pins within 55 ns after stable address and CE assertion |
| Supply Voltage | 3.3 V ± 0.3 V - single-rail operation compatible with modern low-voltage logic families, no 5V tolerance |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating or thermal management overhead |
| Standby Current (ISB) | 660 µW typ. - ultra-low power retention state enabled by CE-driven automatic power-down per port |
| Package | 64-pin TQFP (PNG64), 14 mm × 14 mm × 1.4 mm - surface-mount, RoHS-compliant, reflow-solderable footprint |
| Arbitration Timing (tAPS) | 0 ns min - immediate BUSY assertion on address match, eliminating need for external synchronization delay |
Pinout & Package
70V05L55J is housed in a 64-pin thin quad flatpack (TQFP, package code PNG64), with 16 I/O pins per port (I/O0L–I/O7L and I/O0R–I/O7R), dual independent control sets (CEL/CER, OEL/OER, R/WL/R/WR), and dedicated arbitration signals (BUSYL/BUSYR, M/S, SEML/SEMR, INTL/INTR).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A12L | Left port address inputs | 13-bit address bus for left-side memory access; A0–A12 decode full 8K locations |
| A0R–A12R | Right port address inputs | 13-bit address bus for right-side memory access; fully independent of left port |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; tri-stated when OEL = VIH or CEL = VIH; driven during active read/write |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; tri-stated when OER = VIH or CER = VIH; isolated from left port I/O |
| CEL / CER | Chip enable (left/right) | Active-low enables memory array access per port; controls port-specific standby current reduction |
| OEL / OER | Output enable (left/right) | Active-low enables I/O drivers; allows read data output while keeping port active for writes |
| R/WL / R/WR | Read/write control (left/right) | Active-low = write; high = read; determines direction of data flow on respective I/O bus |
| SEML / SEMR | Semaphore enable (left/right) | Active-low selects semaphore register access instead of memory array; A0–A2 address flag index |
| BUSYL / BUSYR | Busy flag (left/right) | Push-pull output in MASTER mode; input in SLAVE mode; asserts during port contention to block writes |
| M/S | Master/Slave select | VIH = MASTER (BUSY outputs); VIL = SLAVE (BUSY inputs); configures arbitration role at power-up |
| INTL / INTR | Interrupt flag (left/right) | Open-drain output (per datasheet note) signaling semaphore or memory event; requires external pull-up |
| VDD / VSS | Power / ground | 3.3V supply (VDD) and ground (VSS); all VDD/VSS pins must be connected per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port architecture | Enables concurrent reads/writes to same location only when BUSY arbitration clears - eliminates external wait-state logic |
| Hardware semaphore logic | Eight dedicated flags accessible via A0–A2 and SEM pin; supports atomic lock/unlock between processors without software overhead |
| On-chip port arbitration | Automatic resolution of address/contention conflicts using tAPS or CE-edge timing - no external arbiter IC required |
| Interrupt generation | INTL/INTR assert on semaphore set/clear or memory write completion - enables event-driven firmware response |
| Low-power standby mode | 660 µW typical ISB per port - achieved via CE-controlled shutdown of internal circuitry without losing memory contents |
Applications
| Industrial Motion Controller | FPGA-Based Video Frame Buffer |
|---|---|
|
Use Scenario: Two microcontrollers coordinate motor trajectory planning and real-time servo loop execution via shared memory. IC Role / Device Role / Timing Role: 70V05L55J serves as the dual-port memory bridge, with one MCU writing motion profiles and the other reading position feedback - BUSY arbitration prevents overwrites during critical updates. Use Value: Eliminates polling delays and software semaphores; 55 ns access ensures sub-microsecond inter-processor handshaking for <100 µs control cycles. |
Use Scenario: FPGA captures incoming video frames while DSP processes prior frame - both access overlapping buffer regions. IC Role / Device Role / Timing Role: 70V05L55J provides independent read/write ports: FPGA writes new frame pixels to left port, DSP reads previous frame from right port - simultaneous access avoids FIFO bottlenecks. Use Value: Enables zero-latency frame handoff; 8K × 8 capacity supports 640×480 monochrome or 320×240 RGB565 buffers with pixel-level concurrency. |
| Dual-Core Communication Hub | Real-Time Data Logger |
|
Use Scenario: ARM Cortex-M7 and RISC-V core exchange sensor fusion results and command queues in an autonomous sensor node. IC Role / Device Role / Timing Role: 70V05L55J acts as the shared message queue, with semaphore flags (SEML/SEMR) managing ownership of 8 message slots - INTL/INTR signal new data arrival. Use Value: Hardware-accelerated inter-core sync reduces CPU load by >40% vs. spinlock-based software queues; deterministic latency under worst-case contention. |
Use Scenario: Microcontroller logs high-frequency analog measurements to nonvolatile storage while simultaneously servicing USB host requests. IC Role / Device Role / Timing Role: 70V05L55J buffers streaming ADC data on left port while right port feeds USB controller - BUSY flags prevent overwrite during USB bulk transfers. Use Value: Sustains 1 MSPS sampling without dropped samples; 55 ns access allows real-time timestamping and pre-processing before flash writes. |
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-55AXC | 55 ns access, 8K × 8, 3.3V, but uses PLCC-68 package and lacks integrated semaphore logic | Requires external logic for semaphore/arbiter functions; larger PCB footprint due to PLCC | Choose when legacy PLCC layout compatibility is required and arbitration is handled in FPGA logic |
| AS7C38099B-55PCN | 55 ns access, 8K × 8, 3.3V, TQFP-64 package, but no BUSY/SEM/INT pins - basic dual-port only | No hardware arbitration or semaphore support; software-managed coherency required | Choose for cost-sensitive designs where inter-processor coordination is lightweight and predictable |
Compared with CY7C024AV-55AXC and AS7C38099B-55PCN, the 70V05L55J uniquely integrates arbitration, semaphore, and interrupt logic in a compact TQFP-64 package - reducing BOM count and PCB area while guaranteeing deterministic inter-processor timing in hard real-time systems.
Availability
70V05L55J is available at Aetrix Electronics and suitable for industrial motion controllers, FPGA-based video frame buffers, dual-core communication hubs, real-time data loggers, and embedded test equipment requiring stable component supply across extended product lifecycles.
Supply support for 70V05L55J 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
IDT (Integrated Device Technology), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.
The 70V05L55J belongs to IDT's 70V05 family of dual-port SRAMs, designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware-enforced memory coherency is mandatory.
FAQ
What is the maximum operating temperature range for the 70V05L55J?
The 70V05L55J is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Features" section and "Description" page of the official datasheet (DSC 2941/12, June 2019), and applies to all speed grades including the 55 ns variant. No derating is required within this range.
Does the 70V05L55J support true simultaneous read operations on both ports to the same memory address?
Yes, the 70V05L55J supports true simultaneous reads to the same memory location on both ports - a core feature of its "true dual-ported memory cells" architecture. The datasheet explicitly states this capability in the Features list and confirms it is unrestricted by BUSY arbitration, which only affects write contention.
How does the M/S pin configure arbitration behavior in the 70V05L55J?
When M/S = VIH, the 70V05L55J operates as MASTER: BUSYL and BUSYR become push-pull outputs that assert during address contention to block writes. When M/S = VIL, it operates as SLAVE: BUSYL and BUSYR become inputs, allowing external master control. This configuration is fixed at power-up and defines the device's role in cascaded systems.
What is the function of the SEM pins on the 70V05L55J?
The SEML and SEMR pins on the 70V05L55J enable access to the on-chip semaphore register file instead of the main memory array. When SEM = VIL (active low), A0–A2 select one of eight semaphore flags, and I/O0–I/O7 read/write the flag state - providing hardware-accelerated mutual exclusion without software intervention.
Is the 70V05L55J pin-compatible with other members of the 70V05 family such as the 70V05L20J?
No - the 70V05L55J is not pin-compatible with faster variants like the 70V05L20J. While both use the same 64-pin TQFP package and share identical pinouts per the PNG64 diagram, the 70V05L20J is specified for commercial temperature range (0°C to +70°C) and requires different DC/AC timing validation; mixing them risks timing violations in industrial environments.
70V05L55J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 68-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 55ns
- Access Time:
- 55 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.21x24.21)
70V05L55J FAQ
1.How can I place an order for 70V05L55J through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V05L55J 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 70V05L55J reliable?
The price and inventory of 70V05L55J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V05L55J is usually 5 days.
3.What payment methods are accepted for 70V05L55J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V05L55J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V05L55J?
70V05L55J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V05L55J 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 70V05L55J?
For technical support, including 70V05L55J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V05L55J requirements.
6.How does Aetrix verify that 70V05L55J is sourced from the original manufacturer or authorized distributors?
All 70V05L55J 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 70V05L55J meets industry standards.
7.What is the process for return or replacement of 70V05L55J?
All 70V05L55J units undergo pre-shipment inspection (PSI). If there is an issue with 70V05L55J, 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 70V05L55J part is unused and in its original packaging.
Return procedure for 70V05L55J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V05L55J Tags
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