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Renesas 70V26S25J
- Part No.:
- 70V26S25J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
70V26S25J.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,037
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Product details
Overview
70V26S25J from Integrated Device Technology is a high-speed 3.3V 16K × 16 true dual-port static RAM with independent left/right ports, 25 ns max access time (commercial/industrial), on-chip semaphore logic, and hardware BUSY arbitration. It enables simultaneous asynchronous reads of the same memory location and supports MASTER/SLAVE cascading for 32-bit+ bus expansion in real-time multi-processor systems.
For engineers reviewing the 70V26S25J datasheet, 70V26S25J pinout, 70V26S25J application, or 70V26S25J equivalent, key selection criteria include dual-port timing compatibility, 84-pin PLCC package footprint, 3.3V ±0.3V supply operation, and integrated semaphore flag handling for inter-processor resource coordination without software overhead.
Technical Context
The 70V26S25J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - enabling concurrent read/write operations without internal synchronization delay. Its on-chip arbitration logic resolves contention via push-pull BUSY outputs (BUSYL/BUSYR) that gate writes when address matches occur across ports.
Semaphore functionality operates in a dedicated 3-bit address space (A0–A2), using I/O0 as write input and all I/O lines (I/O0–I/O15) as read outputs; CE = VIH and SEM = VIL enable semaphore access, decoupling it from main memory addressing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 16K × 16 bits (256 Kbit), true dual-port SRAM with independent left/right access paths |
| Access Time (tAA) | 25 ns max - guarantees full-speed data availability after address valid at 3.3V, commercial & industrial temp range |
| Supply Voltage | 3.3 V ±0.3 V - single TTL-compatible rail; no level-shifting required for 3.3V logic interfaces |
| Power Consumption | Active: 300 mW typ.; Standby: 3.3 mW typ. - low quiescent draw enables power-sensitive embedded designs |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments without derating |
| Package | 84-pin PLCC - surface-mount compatible with standard reflow profiles and board-level test access |
| Bus Width Control | Separate UBL/LBL and UBR/LBR - enables byte-selective writes for multiplexed data bus compatibility |
Pinout & Package
70V26S25J is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 1.12″ × 1.12″ body size and 0.05″ lead pitch. All VDD pins require connection to 3.3V supply; all VSS pins must be grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A13L / A0R–A13R | Address Inputs (Left/Right) | 14-bit address per port selects one of 16K locations; fully independent addressing enables concurrent access |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data I/O (Left/Right) | 16-bit parallel data path per port; upper/lower byte control via UBL/LBL and UBR/LBR |
| CEL / CER | Chip Enable (Left/Right) | Active-low enables respective port; drives internal circuitry into low-power standby when high |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low initiates write; high enables read - controls direction of I/O drivers per port |
| OEL / OER | Output Enable (Left/Right) | Active-low enables output drivers; allows tristate control independent of R/W state |
| UBL / UBR / LBL / LBR | Byte Select (Upper/Lower) | Enable write/read to upper (I/O8–I/O15) or lower (I/O0–I/O7) byte only - supports 8-bit bus interfacing |
| SEML / SEMR | Semaphore Enable (Left/Right) | Active-low enables semaphore register access; CE = VIH and SEM = VIL required for semaphore mode |
| BUSYL / BUSYR | Busy Flag (Left/Right) | Push-pull output (MASTER) or input (SLAVE); asserts when both ports access same address - blocks write until cleared |
| M/S | Master/Slave Select | VIH configures BUSYL/BUSYR as outputs (MASTER); VIL configures them as inputs (SLAVE) for cascaded arrays |
| VDD / VSS | Power / Ground | Multiple distributed VDD/VSS pins ensure stable 3.3V operation and low-noise grounding across high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write to any memory location - eliminates arbitration wait states in multi-core systems |
| Hardware Semaphore Logic | Eight dedicated latches accessible via A0–A2; supports token-passing resource locking without CPU intervention or software overhead |
| On-Chip BUSY Arbitration | Push-pull BUSY outputs resolve port conflicts automatically; no external logic needed for basic contention detection |
| MASTER/SLAVE Cascading | Single M/S pin configures device as master (BUSY output) or slave (BUSY input) - enables seamless 32-bit+ word expansion |
| Low-Power Standby Mode | 3.3 mW typical standby power (IDT70V26S variant) - extends battery life in portable or always-on industrial controllers |
Applications
| Industrial PLC Communication Buffer | Real-Time DSP Co-Processor Interface |
|---|---|
Use Scenario: Two independent PLC CPUs share status registers and I/O mapping tables via shared memory. IC Role / Device Role / Timing Role: 70V26S25J serves as non-blocking dual-port buffer - left port connects to main controller, right port to motion control module. Use Value: Eliminates polling delays and software handshaking; 25 ns access ensures deterministic response under 100 µs cycle times. | Use Scenario: A DSP and ARM host processor exchange FFT coefficients and filter parameters in real time. IC Role / Device Role / Timing Role: 70V26S25J acts as synchronized data conduit - left port handles DMA bursts from DSP, right port services ARM's cache-coherent reads. Use Value: Hardware semaphore flags prevent race conditions during coefficient updates without interrupt latency penalties. |
| Avionics Sensor Fusion Hub | Medical Imaging Pipeline Memory |
Use Scenario: Radar, INS, and GPS processors write timestamped sensor data into shared memory for fusion algorithms. IC Role / Device Role / Timing Role: 70V26S25J provides atomic, conflict-free write access - each sensor processor uses its own port with BUSY-driven backoff. Use Value: Ensures data integrity across safety-critical domains; 84-pin PLCC meets DO-254 mechanical reliability requirements. | Use Scenario: CT scanner front-end ASIC streams raw projection data while reconstruction engine reads completed slices. IC Role / Device Role / Timing Role: 70V26S25J functions as ping-pong frame buffer - left port accepts incoming projections, right port supplies reconstructed image tiles. Use Value: 16-bit width and 25 ns access sustain >1.2 Gbps aggregate throughput required for real-time volumetric rendering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C136-25JC | 5V-only supply; 25 ns access; 16K × 16; 84-pin PLCC; no integrated semaphore logic | Requires external arbitration logic for multi-processor use; incompatible with 3.3V-only systems | Select when legacy 5V infrastructure exists and semaphore functionality is implemented in FPGA or software |
| AS7C316000B-25JC | 3.3V supply; 25 ns access; 16K × 16; 84-pin PLCC; no BUSY or semaphore hardware | Lacks hardware arbitration - relies on software protocols or external logic for conflict resolution | Choose for cost-sensitive applications where deterministic timing is less critical than BOM simplification |
Compared with CY7C136-25JC and AS7C316000B-25JC, the 70V26S25J uniquely integrates both hardware BUSY arbitration and eight semaphore flags - eliminating external components and software overhead for real-time inter-processor coordination in 3.3V systems.
Availability
70V26S25J is available at Aetrix Electronics and suitable for industrial PLC communication buffers, real-time DSP co-processor interfaces, avionics sensor fusion hubs, medical imaging pipeline memory, and embedded multi-controller systems requiring stable component supply across extended product lifecycles.
Supply support for 70V26S25J 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 sensor signal conditioning ICs for high-performance computing and communications.
The IDT70V26 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - delivering hardware-accelerated memory sharing without software arbitration bottlenecks.
FAQ
What is the maximum operating temperature range for the 70V26S25J?
The 70V26S25J is rated for industrial temperature operation from −40°C to +85°C. This specification is guaranteed across the full 3.3V ±0.3V supply range and applies to all AC and DC electrical characteristics in the datasheet, including 25 ns access time and BUSY arbitration timing.
Does the 70V26S25J support simultaneous read operations from both ports to the same memory address?
Yes, the 70V26S25J supports true simultaneous reads from both ports to the same memory location without contention or timing penalty. This capability is enabled by its true dual-port SRAM cell architecture, which maintains independent bit-line sensing paths for left and right ports - a core feature confirmed in the Functional Block Diagram and Truth Table I.
How does the semaphore functionality work in the 70V26S25J?
The 70V26S25J contains eight dedicated semaphore latches addressed by A0–A2. To access them, CE must be high and SEM low. Writing "0" to I/O0 sets the latch (grants token); writing "1" releases it. All I/O lines (I/O0–I/O15) reflect the current latch value on read - enabling atomic lock/unlock sequences without software race conditions.
What is the role of the M/S pin on the 70V26S25J?
The M/S pin configures the 70V26S25J as either MASTER (M/S = VIH) or SLAVE (M/S = VIL). In MASTER mode, BUSYL and BUSYR function as push-pull outputs indicating port contention. In SLAVE mode, they become inputs used to receive BUSY signals from a master device - enabling scalable width expansion of dual-port memory arrays.
Can the 70V26S25J operate with a 2.5V supply voltage?
No, the 70V26S25J requires a nominal 3.3V supply with tolerance of ±0.3V (3.0V to 3.6V). Operation outside this range is not characterized or guaranteed. The Absolute Maximum Ratings specify VTERM up to +4.6V, but DC and AC specifications - including 25 ns access time and I/O voltage levels - are validated only within the 3.0–3.6V window.
70V26S25J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 84-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 16K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 84-PLCC (29.31x29.31)
70V26S25J FAQ
1.How can I place an order for 70V26S25J through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V26S25J 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 70V26S25J reliable?
The price and inventory of 70V26S25J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V26S25J is usually 5 days.
3.What payment methods are accepted for 70V26S25J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V26S25J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V26S25J?
70V26S25J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V26S25J 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 70V26S25J?
For technical support, including 70V26S25J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V26S25J requirements.
6.How does Aetrix verify that 70V26S25J is sourced from the original manufacturer or authorized distributors?
All 70V26S25J 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 70V26S25J meets industry standards.
7.What is the process for return or replacement of 70V26S25J?
All 70V26S25J units undergo pre-shipment inspection (PSI). If there is an issue with 70V26S25J, 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 70V26S25J part is unused and in its original packaging.
Return procedure for 70V26S25J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V26S25J Tags
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AT24C02C-XHM-T
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