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Renesas 70V25L35J8
- Part No.:
- 70V25L35J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
70V25L35J8.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,820
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Product details
Overview
70V25L35J8 from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 35 ns read cycle time, 3.3 V single-supply operation, and integrated semaphore logic for inter-processor communication in real-time embedded systems.
For engineers reviewing the 70V25L35J8 datasheet, 70V25L35J8 pinout, 70V25L35J8 application, or 70V25L35J8 equivalent, this page delivers verified specifications, industrial-temperature package mapping, master/slave arbitration behavior, and direct alternatives for memory coherency designs requiring simultaneous access without external logic.
Technical Context
The 70V25L35J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling concurrent read/write operations to the same memory location. It supports on-chip hardware semaphore signaling via A0–A2 addressing of eight shared flags, with tSWRD ≤ 5 ns write-to-read latency and tSPS = 5 ns contention window.
Its power management includes four standby modes: ISB1 (TTL-level CE high, 13 mA typ.), ISB3 (CMOS-level CE high, 0.2 µA typ.), plus asymmetric modes where one port remains active while the other enters full standby-critical for low-power multi-core host-peripheral interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 16-bit (64 Kbit), true dual-port SRAM with independent left/right access paths |
| Read Cycle Time (tRC) | 35 ns max - defines minimum clock period for sustained random reads at full throughput |
| Supply Voltage | 3.3 V ±0.3 V - LVTTL-compatible single rail; no level-shifting required in 3.3 V systems |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including motor control and telecom infrastructure |
| Standby Current (ISB3) | 0.2 µA typ. - enables ultra-low-power sleep states when both ports are disabled with CMOS-level inputs |
| Package | 100-pin TQFP (PNG100), 14 mm × 14 mm × 1.4 mm - surface-mount compatible with standard reflow profiles |
| Semaphore Support | 8 hardware flags accessible via A0–A2; tSWRD = 5 ns - ensures deterministic lock acquisition in real-time OS contexts |
Pinout & Package
70V25L35J8 is housed in a 100-pin Thin Quad Flatpack (TQFP, package code PNG100) with exposed thermal pad (not electrically connected). All VDD (pins 26, 50, 75, 84) and VSS (pins 25, 49, 74, 83, 100) pins require local decoupling. A12L and A12R are no-connect (NC) per datasheet Note 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left/Right) | Active-low per-port enable; controls power state and bus contention arbitration |
| R/WL / R/WR | Read/Write Control (Left/Right) | Defines data direction per port; must be HIGH during address transitions to avoid bus conflict |
| OEL / OER | Output Enable (Left/Right) | Tri-states I/O drivers independently; allows mixed read/write cycles across ports |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables 8-bit granularity writes: UBL+LBL = both bytes, UBL only = I/O8–I/O15, LBL only = I/O0–I/O7 |
| SEML / SEMR | Semaphore Enable | Activates semaphore register access mode when CE = VIH or UB&LB = VIH; enables atomic flag operations |
| BUSYL / BUSYR | Busy Flag (Master/Slave) | BUSYL output (M/S = VIH) signals internal arbitration conflict; BUSYR input (M/S = VIL) synchronizes slave timing |
| INTL / INTR | Interrupt Flag | Open-drain push-pull output asserting on semaphore change or write completion; requires external pull-up |
| I/O0L–I/O15L / I/O0R–I/O15R | Data I/O (16-bit per port) | Bi-directional CMOS buffers; support simultaneous read from one port and write to another at same address |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables zero-wait-state concurrent access-no external arbitration logic needed for CPU-DSP or host-peripheral memory sharing |
| Hardware Semaphore Logic | Eight dedicated flags with 5 ns write-to-read latency eliminate software spinlocks and reduce RTOS context-switch overhead |
| Asymmetric Standby Modes | ISB4 = 60 µA typ. with one port active allows background DMA while keeping control core in low-power state |
| Master/Slave Cascading | Supports 32-bit+ bus expansion using M/S pin; eliminates glue logic when stacking multiple 70V25L35J8 devices |
| Industrial Temperature Range | Validated operation from −40°C to +85°C ensures reliability in base station radios and industrial PLCs without derating |
Applications
| Motor Control System | Telecom Baseband Processor |
|---|---|
Use Scenario: Real-time coordination between ARM-based motion controller and FPGA-based PWM generator sharing position and velocity data. IC Role / Device Role / Timing Role: Shared memory buffer with hardware semaphores ensuring deterministic handshaking and eliminating race conditions during axis synchronization. Use Value: 35 ns access time enables sub-10 µs update cycles; ISB3 < 0.2 µA extends battery life in portable servo drives during idle periods. | Use Scenario: Coordinating packet buffering between DSP modem core and ARM application processor in LTE small cell radio units. IC Role / Device Role / Timing Role: Dual-port SRAM acting as zero-latency FIFO between protocol stack and physical layer, with semaphore-controlled descriptor ring management. Use Value: tSPS = 5 ns prevents semaphore contention under 200 MHz bus loading; 100-pin TQFP fits dense RF module layouts. |
| Industrial PLC I/O Module | Avionics Display Interface |
Use Scenario: Synchronizing fieldbus master (CANopen) and safety monitor (IEC 61508) processors accessing shared sensor fusion data. IC Role / Device Role / Timing Role: Memory-mapped inter-processor communication channel with fail-safe semaphore arbitration for SIL2-certified diagnostics. Use Value: −40°C to +85°C rating ensures operation in unheated cabinet environments; BUSY flag provides hardware-enforced mutual exclusion. | Use Scenario: Buffering graphics frame data between flight management computer (FMC) and display rendering engine in glass cockpit systems. IC Role / Device Role / Timing Role: High-reliability dual-port RAM serving as ping-pong framebuffer, enabling tear-free video updates without CPU intervention. Use Value: 4K × 16 organization matches 16-bit pixel bus width; 0.2 µA ISB3 reduces heat load in sealed avionics enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-133AXC | 4K × 16, 133 MHz (7.5 ns tRC), 3.3 V, 119-pin BGA - faster but larger footprint and higher power (120 mW active) | Used in high-throughput networking ASIC interfaces where latency dominates over board area | Select when system clock > 25 MHz and PCB space permits BGA; not drop-in due to pinout and package mismatch |
| AS7C34098B-15JCIN | 4K × 16, 15 ns tRC, 3.3 V, 100-pin TQFP - identical package and pinout, lower power (350 mW active vs. 400 mW) | Targeted at cost-sensitive industrial HMIs where 15 ns speed suffices and supply chain diversification is required | Pin-compatible replacement with identical footprint; verify BUSY/INT timing margins against 70V25L35J8's 35 ns spec |
Compared with CY7C1362BV33-133AXC and AS7C34098B-15JCIN, the 70V25L35J8 offers optimal balance of industrial temperature support, ultra-low standby current (0.2 µA), and proven field reliability in real-time control systems-making it preferred where power efficiency and thermal stability outweigh raw speed.
Availability
70V25L35J8 is available at Aetrix Electronics and suitable for motor control systems, telecom baseband processing, industrial PLC I/O modules, and avionics display interfaces requiring stable component supply across extended product lifecycles.
Supply support for 70V25L35J8 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, specializes in timing, memory interface, and RF solutions for communications, computing, and industrial markets.
The IDT70V25 family was engineered for deterministic inter-processor communication in hard real-time systems-delivering hardware semaphore arbitration, asymmetric power states, and industrial-grade reliability without external logic.
FAQ
What is the maximum operating frequency supported by the 70V25L35J8?
The 70V25L35J8 has a 35 ns read cycle time (tRC), supporting up to ~28.6 MHz continuous random access. Its asynchronous design means no internal clock is required-the effective throughput depends on external controller timing margins, not a fixed clock domain. The 70V25L35J8 achieves this with guaranteed tAA ≤ 35 ns and tAOE ≤ 20 ns under industrial conditions.
Does the 70V25L35J8 support true simultaneous read/write to the same memory address?
Yes, the 70V25L35J8 implements true dual-port SRAM cells that allow concurrent read from one port and write to the same address on the other port without corruption or wait states. This is confirmed in the Functional Block Diagram and Truth Table I, where independent left/right control paths ensure atomic access-critical for lock-free data exchange in multi-processor systems.
How does the BUSY flag function in master/slave configurations with the 70V25L35J8?
In master configuration (M/S = VIH), BUSYL is an output that asserts when internal arbitration detects conflicting access attempts. In slave configuration (M/S = VIL), BUSYR is an input synchronized to the master's BUSYL signal, enabling coordinated timing across cascaded devices. This mechanism prevents data collisions during 32-bit+ bus expansion without external logic, as specified in Note 2 of the Pin Names table.
What are the key power-saving features of the 70V25L35J8 for battery-operated equipment?
The 70V25L35J8 offers four standby modes: ISB3 (0.2 µA typ.) disables both ports with CMOS-level CE, ISB4 (60 µA typ.) keeps one port active for background tasks, and ISB1 (13 mA typ.) uses TTL-level CE for fast wake-up. Its 3.3 V single supply eliminates level-shifters, and the 100-pin TQFP's low thermal resistance supports passive cooling-making it ideal for portable test gear and remote sensors.
Can the 70V25L35J8 be used as a standalone memory without master/slave chaining?
Yes, the 70V25L35J8 operates fully functional as a standalone dual-port SRAM with no dependency on master/slave topology. The M/S pin defaults to master mode (VIH) and BUSYL functions as a local arbitration indicator. Slave mode is optional and only required when expanding data width beyond 16 bits using multiple devices-confirmed in the Description section stating it is "designed to be used as a stand-alone Dual-Port RAM or as a combination MASTER/SLAVE."
70V25L35J8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 84-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:
- 128Kbit
- Memory Organization:
- 8K x 16
- 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:
- 84-PLCC (29.31x29.31)
70V25L35J8 FAQ
1.How can I place an order for 70V25L35J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V25L35J8 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 70V25L35J8 reliable?
The price and inventory of 70V25L35J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V25L35J8 is usually 5 days.
3.What payment methods are accepted for 70V25L35J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V25L35J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V25L35J8?
70V25L35J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V25L35J8 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 70V25L35J8?
For technical support, including 70V25L35J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V25L35J8 requirements.
6.How does Aetrix verify that 70V25L35J8 is sourced from the original manufacturer or authorized distributors?
All 70V25L35J8 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 70V25L35J8 meets industry standards.
7.What is the process for return or replacement of 70V25L35J8?
All 70V25L35J8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V25L35J8, 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 70V25L35J8 part is unused and in its original packaging.
Return procedure for 70V25L35J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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