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Renesas 7025S35JI
- Part No.:
- 7025S35JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
7025S35JI.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,035
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Product details
Overview
IDT7025S35JI from Integrated Device Technology (IDT) is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent left/right ports, 35 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to the same memory location-critical for real-time inter-processor communication in embedded control systems.
For engineers reviewing the IDT7025S35JI datasheet, IDT7025S35JI pinout, IDT7025S35JI application, or IDT7025S35JI equivalent, key selection criteria include dual-port arbitration timing (tBAA ≤ 20 ns), BUSY flag behavior under M/S = VIH, semaphore support for resource locking, and compatibility with 84-pin PLCC packaging for legacy industrial PCBs.
Technical Context
The IDT7025S35JI implements full hardware port arbitration with dedicated BUSY output (Master) or input (Slave), enabling deterministic conflict resolution without external logic. Its on-chip semaphore logic supports eight flags addressed via A0–A2, allowing atomic read-modify-write operations across ports.
It operates fully asynchronously from either port, with separate CE, R/W, OE, UB/LB, and SEM controls per side. The device supports battery backup data retention at 2V (L-version only), though the S-version prioritizes speed over ultra-low standby power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 16 bits (128 Kbit), true dual-port SRAM with independent address/data/control per port |
| Max Read Cycle Time | 35 ns - defines minimum clock period for synchronous interface or maximum burst rate in asynchronous systems |
| Operating Voltage | 5.0 V ±10% - compatible with legacy TTL/CMOS logic families without level-shifting |
| Temperature Range | –40°C to +85°C - qualified for industrial environments including motor drives and PLCs |
| Active Power (Typ) | 150 mA (both ports active, f = fMAX) - translates to ~750 mW at 5V, suitable for thermally constrained modules |
| Standby Current | 13 mA (ISB1, both ports disabled, TTL-level inputs) - enables low-power sleep modes without external power gating |
| Package | 84-pin PLCC (Plastic Leaded Chip Carrier) - surface-mount, rework-friendly, RoHS-compliant footprint |
Pinout & Package
Package: 84-pin Plastic Leaded Chip Carrier (PLCC), JEDEC MS-026AC compliant, body size ≈ 29.2 mm × 29.2 mm × 4.3 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A12L / A0R–A12R | Address Inputs (Left/Right) | 13-bit address per port; supports full 8K addressing independently on each side |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data Bus (Left/Right) | 16-bit parallel data path per port; byte-selectable via UBL/UBR and LBL/LBR |
| CEL / CER | Chip Enable (Left/Right) | Active-low enable per port; allows independent port activation or power-down control |
| R/WL / R/WR | Read/Write Control (Left/Right) | Defines direction per port; high = read, low = write - no bus turnaround delay required |
| OEL / OER | Output Enable (Left/Right) | Tri-states outputs independently; enables shared bus architectures with multiple devices |
| SEML / SEMR | Semaphore Enable (Left/Right) | Activates on-chip semaphore register access (A0–A2) for inter-port synchronization |
| BUSYL / BUSYR | Busy Flag (Left/Right) | When M/S = H (Master), BUSYR asserts during contention; when M/S = L (Slave), BUSYL is input for arbitration coordination |
| M/S | Master/Slave Select | Configures device role in cascaded systems; determines BUSY signal direction and arbitration priority |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables concurrent read/write from both ports to same address - eliminates software polling or external arbitration logic |
| Hardware Semaphore Logic | Eight dedicated flags accessible via A0–A2; supports atomic lock/unlock sequences without CPU intervention |
| On-Chip Port Arbitration | Automatic BUSY assertion resolves contention within 20 ns (tBAA); guarantees deterministic access ordering |
| Separate Byte Enables | UBL/LBL and UBR/LBR allow independent upper/lower byte writes - essential for mixed-width data transfers |
| Master/Slave Cascading | Supports 32-bit+ word expansion using M/S pin; eliminates glue logic when stacking devices for wider data buses |
Applications
| Industrial PLC Memory Buffer | Real-Time DSP Co-Processor Interface |
|---|---|
Use Scenario: Shared memory between main PLC CPU and motion control coprocessor executing servo loop updates at 10 kHz. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency inter-processor mailbox; BUSY flag prevents write collisions during simultaneous access. Use Value: Eliminates need for handshake protocols or FIFO buffers, reducing jitter in closed-loop timing by up to 35 ns per transaction. | Use Scenario: Offloading FFT computation from host MCU to dedicated DSP while maintaining synchronized data exchange. IC Role / Device Role / Timing Role: Provides concurrent read (DSP fetches coefficients) and write (MCU streams new samples) to overlapping memory regions. Use Value: Enables pipelined processing with no bus arbitration overhead - sustains 35 ns read cycles while supporting 20 ns write pulses. |
| Avionics Data Concentrator | Medical Imaging Frame Store |
Use Scenario: Aggregating sensor data from multiple ARINC-429 receivers into a central flight management unit. IC Role / Device Role / Timing Role: Acts as time-deterministic buffer with semaphore-controlled access; ensures priority-based data ingestion without packet loss. Use Value: Hardware semaphore flags prevent race conditions during interrupt-driven data capture - critical for DO-254 compliance. | Use Scenario: Storing uncompressed 12-bit X-ray frames (2048 × 2048) for real-time contrast enhancement prior to display. IC Role / Device Role / Timing Role: Serves as dual-port frame buffer: one port accepts ADC stream, second port feeds GPU pipeline at pixel-clock rate. Use Value: 35 ns access time supports >28 MHz pixel clocks; byte-select capability matches 12-bit packed data formats without padding overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C133-35JC | 35 ns access, 8K × 16, 5V, 84-pin PLCC - identical speed/temp/package but Cypress implementation lacks integrated semaphore logic | Requires external logic for resource locking; less suitable for tightly coupled multi-CPU systems | Prefer IDT7025S35JI where semaphore-based synchronization is required; CY7C133-35JC fits simpler ping-pong buffering. |
| AS7C3256A-35JC | 35 ns, 16K × 16, 5V, 84-pin PLCC - double density but no BUSY arbitration or M/S cascading support | Higher capacity for larger buffers, but lacks hardware conflict detection - increases firmware complexity | Select IDT7025S35JI for deterministic arbitration in safety-critical designs; AS7C3256A-35JC suits cost-sensitive, single-controller applications. |
Compared with CY7C133-35JC and AS7C3256A-35JC, the IDT7025S35JI uniquely integrates BUSY-driven arbitration and on-chip semaphores - reducing BOM count and eliminating race-condition risks in multi-processor real-time systems.
Availability
IDT7025S35JI is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.
Supply support for IDT7025S35JI 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, and RF solutions for communications and industrial markets.
The IDT7025 family was designed specifically for high-reliability dual-processor interconnect applications demanding deterministic latency, hardware arbitration, and seamless 32-bit bus expansion - targeting aerospace, factory automation, and test equipment.
FAQ
What is the maximum operating temperature range for the IDT7025S35JI?
The IDT7025S35JI is rated for the industrial temperature range of –40°C to +85°C, as confirmed in the Absolute Maximum Ratings table and Operating Conditions section of the official datasheet. This makes it suitable for deployment in harsh environments such as motor control cabinets and outdoor telecom infrastructure where ambient temperatures exceed commercial-grade limits.
Does the IDT7025S35JI support battery backup data retention?
No, the IDT7025S35JI does not support battery backup data retention. That feature is exclusive to the 'L' variant (e.g., IDT7025L35JI), which specifies 2V data retention in its DC Electrical Characteristics. The 'S' suffix denotes the standard-speed, higher-power version optimized for performance rather than ultra-low standby current.
How does the M/S pin affect BUSY signal behavior in the IDT7025S35JI?
When M/S = H (high), the IDT7025S35JI operates as Master: BUSYR becomes an output that asserts during port contention. When M/S = L (low), it operates as Slave: BUSYL functions as an input, allowing external arbitration control. This configuration is mandatory for cascading multiple IDT7025S35JI devices into wider memory systems.
Can the IDT7025S35JI be used in a 32-bit data path configuration?
Yes, the IDT7025S35JI supports 32-bit expansion via Master/Slave cascading. Two devices can be configured-one as Master (M/S = H), one as Slave (M/S = L)-with their BUSY signals interconnected to enable full-speed, error-free 32-bit word access without additional discrete logic, as documented in the Functional Description and Pin Configurations sections.
What is the purpose of the SEM pin on the IDT7025S35JI?
The SEM (Semaphore Enable) pin on the IDT7025S35JI activates the on-chip semaphore register bank. When SEM = L, the device interprets A0–A2 as semaphore address lines and routes I/O0–I/O15 to eight dedicated flags - enabling atomic lock/unlock operations between ports without CPU intervention or external memory-mapped registers.
7025S35JI 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:
- 128Kbit
- Memory Organization:
- 8K x 16
- 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:
- 84-PLCC (29.31x29.31)
7025S35JI FAQ
1.How can I place an order for 7025S35JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7025S35JI 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 7025S35JI reliable?
The price and inventory of 7025S35JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7025S35JI is usually 5 days.
3.What payment methods are accepted for 7025S35JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7025S35JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7025S35JI?
7025S35JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7025S35JI 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 7025S35JI?
For technical support, including 7025S35JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7025S35JI requirements.
6.How does Aetrix verify that 7025S35JI is sourced from the original manufacturer or authorized distributors?
All 7025S35JI 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 7025S35JI meets industry standards.
7.What is the process for return or replacement of 7025S35JI?
All 7025S35JI units undergo pre-shipment inspection (PSI). If there is an issue with 7025S35JI, 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 7025S35JI part is unused and in its original packaging.
Return procedure for 7025S35JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7025S35JI Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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AT24C08C-STUM-T
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