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Renesas 70V05S35J8
- Part No.:
- 70V05S35J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
70V05S35J8.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,284
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Product details
Overview
70V05S35J8 from IDT (now Renesas) is a high-speed 3.3V 8K × 8 dual-port static RAM with true independent left/right ports, 35 ns maximum access time, TTL-compatible I/O, and on-chip semaphore and interrupt logic - used in real-time inter-processor communication, video frame buffers, and industrial motion control systems where simultaneous read/write access to shared memory is required.
For engineers reviewing the 70V05S35J8 datasheet, 70V05S35J8 pinout, 70V05S35J8 application, or 70V05S35J8 equivalent, key selection criteria include bus arbitration timing (tAPS, tBDD), BUSY/INT flag behavior, master/slave cascading capability, and industrial-grade temperature support (–40°C to +85°C).
Technical Context
The 70V05S35J8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port. It integrates hardware semaphore logic for eight flags (addressed via A0–A2), automatic port arbitration, and push-pull BUSY/INT outputs - eliminating need for external logic in master/slave configurations.
It supports two distinct operational modes: RAM access (CE = VIL, SEM = VIH) and semaphore access (CE = VIH, SEM = VIL). Port-to-port contention resolution uses address-match arbitration (tAPS ≤ 35 ns) or CE-timing arbitration (tBAC), with BUSY assertion blocking writes during conflict.
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) | 35 ns max - guarantees valid data at I/O pins within 35 ns after stable address and CE/OE assertion |
| Supply Voltage | 3.3 V ± 0.3 V - single-supply operation compatible with modern low-voltage digital systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Standby Current (ISB) | 660 µW typ. - ultra-low power consumption during inactive port states, enabling energy-efficient designs |
| Bus Arbitration | Hardware-supported via BUSY flag and M/S pin - enables deterministic master/slave cascading for 16-bit+ data width expansion |
| Semaphore Support | 8 dedicated flags with full read/write control - provides atomic resource locking across ports without software overhead |
Pinout & Package
70V05S35J8 is packaged in a 68-pin PLCC (Plastic Leaded Chip Carrier) with 0.05-inch lead pitch. The package body measures approximately 0.95 in × 0.95 in × 0.17 in and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A12L | Left port address inputs | 13-bit address bus for left-side memory access (8K = 2¹³) |
| 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-state controlled by OEL and R/WL |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; tri-state controlled by OER and R/WR |
| CEL, CER | Chip enable (left/right) | Active-low enables respective port; deassertion places I/O in high-impedance state |
| OEL, OER | Output enable (left/right) | Active-low controls output drivers - allows read-only gating independent of CE |
| R/WL, R/WR | Read/write control (left/right) | Active-low write; high = read - defines direction for I/O bus during CE/OE active |
| SEML, SEMR | Semaphore enable (left/right) | Active-high selects semaphore register access mode (vs. RAM mode when low) |
| BUSYL, BUSYR | Busy flag (left/right) | Push-pull output (master) or input (slave); indicates port contention during address match |
| INTL, INTR | Interrupt flag (left/right) | Push-pull output; asserts when opposite port writes to configured interrupt address |
| M/S | Master/Slave select | VIL configures as slave (BUSY input); VIH configures as master (BUSY output) |
| VDD, VSS | Power and ground | Multiple VDD/VSS pins ensure low-noise supply distribution and signal integrity |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port architecture | Enables simultaneous, independent reads/writes to same or different addresses - no internal arbitration delay for non-conflicting accesses |
| Hardware semaphore logic | Eight dedicated flags accessible via A0–A2; eliminates need for external latches or software polling in multi-processor resource sharing |
| Configurable master/slave mode | M/S pin sets BUSY as input (slave) or output (master), enabling scalable 16-bit+ memory expansion without glue logic |
| Interrupt generation | INTL/INTR assert on write to user-defined address - provides hardware-triggered event signaling between processors |
| Industrial temperature range | –40°C to +85°C operation with guaranteed 35 ns access time - suitable for factory automation and transportation electronics |
| Low-power standby | 660 µW typical ISB - reduces system-level power budget during idle periods without sacrificing wake-up latency |
Applications
| Industrial Motion Controller | Real-Time Video Frame Buffer |
|---|---|
|
Use Scenario: Two microcontrollers coordinate motor position and sensor feedback in closed-loop servo systems. IC Role / Device Role / Timing Role: Shared memory buffer with atomic semaphore-controlled access ensures deterministic handoff of position commands and encoder data. Use Value: Eliminates race conditions during concurrent read/write - guarantees synchronized motion profiles with sub-microsecond arbitration latency. |
Use Scenario: FPGA-based video processor writes captured frames while DSP reads for compression, with zero-frame-drop requirements. IC Role / Device Role / Timing Role: Dual-port SRAM acts as ping-pong frame buffer; left port handles capture, right port handles encode. Use Value: 35 ns access enables real-time 1080p60 streaming without FIFO bottlenecks or external arbitration logic. |
| Multi-Core Communication Hub | Avionics Data Logger |
|
Use Scenario: ARM Cortex-A and RISC-V cores exchange telemetry and control packets in safety-critical embedded systems. IC Role / Device Role / Timing Role: Inter-processor mailbox using semaphore flags for lock-free message passing and interrupt-driven notification. Use Value: Hardware semaphore reduces inter-core latency to <5 ns vs. software mutex - critical for deterministic response under load. |
Use Scenario: Flight data recorder captures sensor streams from multiple analog/digital sources while simultaneously offloading to flash storage. IC Role / Device Role / Timing Role: Dual-port RAM buffers incoming sensor data (left port) while background controller reads and formats it (right port). Use Value: Industrial temp rating and 35 ns access ensure reliable operation during rapid thermal transients and high-throughput logging. |
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 | 3.3V 8K × 16 dual-port SRAM; 35 ns access; 100-pin TQFP; no integrated semaphore logic | Requires external logic for semaphore/arbiter functions; wider data bus but larger footprint | Select when 16-bit word width is mandatory and external arbitration is acceptable |
| IDT70V25L25PFGI | 3.3V 32K × 16 dual-port SRAM; 25 ns access; 100-pin TQFP; includes semaphore and interrupt | Higher density and faster speed, but incompatible pinout and larger package | Select when higher capacity and lower latency justify PCB redesign and cost increase |
Compared with CY7C024AV-35AXC and IDT70V25L25PFGI, the 70V05S35J8 uniquely balances 8-bit data width, 68-pin PLCC compactness, integrated semaphore/INT/BUSY logic, and industrial temperature support - making it optimal for space-constrained, cost-sensitive dual-processor systems requiring hardware-coordinated memory access.
Availability
70V05S35J8 is available at Aetrix Electronics and suitable for industrial motion controllers, real-time video processing systems, and avionics data loggers requiring stable component supply across extended production lifecycles.
Supply support for 70V05S35J8 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 (formerly Integrated Device Technology) is a global semiconductor leader specializing in high-performance memory, timing, and interface solutions for industrial, automotive, and communications markets.
The 70V05S35J8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems demanding hardware-enforced concurrency control.
FAQ
What is the maximum operating temperature range for the 70V05S35J8?
The 70V05S35J8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all electrical parameters including 35 ns access time, BUSY arbitration timing, and standby current - verified per the official Renesas datasheet DSC2941/12 revision June 2019.
Does the 70V05S35J8 support true simultaneous read operations on both ports?
Yes, the 70V05S35J8 supports true simultaneous reads from both ports to the same or different memory locations without contention or arbitration delay. Its dual-port SRAM cell architecture enables independent, fully asynchronous access - confirmed in the Functional Block Diagram and Truth Table I of the 70V05S35J8 datasheet.
How does the BUSY signal behave when the 70V05S35J8 is configured as a slave?
When M/S = VIL, the 70V05S35J8 operates in slave mode and BUSYL/BUSYR become inputs. In this configuration, an external master drives BUSY to inhibit writes during contention - as documented in Note 1 of the Functional Block Diagram and Pin Configurations section of the 70V05S35J8 datasheet.
Can the 70V05S35J8 be used in a 16-bit data bus configuration?
Yes, the 70V05S35J8 supports 16-bit expansion via master/slave cascading. When two devices are connected with M/S = VIH (master) and M/S = VIL (slave), the BUSY output of the master controls write enable on the slave - enabling full-speed, error-free 16-bit operation without additional logic, per the device description on page 2 of the 70V05S35J8 datasheet.
What is the function of the SEM pins on the 70V05S35J8?
The SEML and SEMR pins on the 70V05S35J8 select semaphore register access mode: when SEM = VIH and CE = VIL, the device operates in RAM mode; when SEM = VIL and CE = VIH, it enters semaphore mode - allowing read/write control of eight hardware flags via A0–A2, as defined in Truth Table II and the AC Electrical Characteristics table on page 10 of the 70V05S35J8 datasheet.
70V05S35J8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 68-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:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 35ns
- Access Time:
- 35 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)
70V05S35J8 FAQ
1.How can I place an order for 70V05S35J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V05S35J8 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 70V05S35J8 reliable?
The price and inventory of 70V05S35J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V05S35J8 is usually 5 days.
3.What payment methods are accepted for 70V05S35J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V05S35J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V05S35J8?
70V05S35J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V05S35J8 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 70V05S35J8?
For technical support, including 70V05S35J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V05S35J8 requirements.
6.How does Aetrix verify that 70V05S35J8 is sourced from the original manufacturer or authorized distributors?
All 70V05S35J8 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 70V05S35J8 meets industry standards.
7.What is the process for return or replacement of 70V05S35J8?
All 70V05S35J8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V05S35J8, 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 70V05S35J8 part is unused and in its original packaging.
Return procedure for 70V05S35J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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