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Renesas 70V25S20J8
- Part No.:
- 70V25S20J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 84-LCC (J-Lead)
- Datasheet:
-
70V25S20J8.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 84PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
IDT70V25S20J8 from Integrated Device Technology is a high-speed 3.3V 4K x 16 dual-port static RAM with true independent left/right port access, 20 ns maximum read cycle time (tRC), 400 mW typical active power, and industrial temperature support (–40°C to +85°C). It enables simultaneous asynchronous reads/writes to shared memory in real-time inter-processor communication systems.
For engineers reviewing the IDT70V25S20J8 datasheet, IDT70V25S20J8 pinout, IDT70V25S20J8 application, or IDT70V25S20J8 equivalent, key selection criteria include dual-port arbitration logic, on-chip semaphore support, BUSY/INT flag signaling, LVTTL-compatible 3.3V operation, and 100-pin TQFP packaging for embedded control and telecom data buffering.
Technical Context
The IDT70V25S20J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent access without external arbitration. Its on-chip hardware supports semaphore flag management via A0–A2 addressing and dedicated SEM pins, ensuring deterministic resource locking between processors.
It features master/slave cascading capability using the M/S pin to expand bus width beyond 16 bits, with BUSY output (master) or input (slave) coordination. Power management includes CE-controlled automatic standby mode, achieving 3.3 mW typical standby current at 3.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 16-bit (64 Kbit), dual-port SRAM with independent left/right ports |
| Access Time (tAA) | 20 ns max - guarantees deterministic latency for real-time processor-to-processor data exchange |
| Read Cycle Time (tRC) | 20 ns max - defines minimum clock period for continuous burst reads on either port |
| Supply Voltage | 3.3 V ± 0.3 V - LVTTL-compatible single supply eliminates level-shifting in 3.3V system designs |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and base station applications |
| Active Power (typ.) | 400 mW - enables thermal budgeting in dense multi-chip modules without forced cooling |
| Standby Current (typ.) | 3.3 mW - supports low-power sleep modes in battery-backed or energy-conscious systems |
Pinout & Package
Package: 100-pin TQFP (PNG100), 14 mm × 14 mm × 1.4 mm body, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A11L | Left port address inputs | 12-bit address bus for left-side memory access (4K = 2¹²) |
| A0R–A11R | Right port address inputs | Independent 12-bit address bus for right-side access; no timing dependency on left port |
| I/O0L–I/O7L, I/O8L–I/O15L | Left port bidirectional data | Two 8-bit byte lanes supporting multiplexed bus compatibility via UBL/LBL |
| I/O0R–I/O7R, I/O8R–I/O15R | Right port bidirectional data | Full 16-bit parallel interface per port; no shared data lines between ports |
| CEL, CER | Chip enable (left/right) | Independent port gating - disabling one port reduces dynamic current while preserving other port operation |
| R/WL, R/WR | Read/write control (left/right) | Asynchronous control: LOW = write, HIGH = read; no internal state machine or clock required |
| OEL, OER | Output enable (left/right) | Tri-state control for data bus sharing; allows connection to common system data bus with external arbitration |
| UBL, LBL, UBR, LBR | Upper/lower byte select | Enables byte-level writes - critical for mixed-endian or partial-word update scenarios |
| SEML, SEMR | Semaphore enable | Activates 8-flag semaphore register (addressed by A0–A2) for inter-processor synchronization |
| BUSYL, BUSYR | Busy flag (input/output) | M/S = VIH → BUSY is output (master); M/S = VIL → BUSY is input (slave); resolves port contention |
| INTL, INTR | Interrupt flag | Open-drain push-pull output signals semaphore event or write completion to host processor |
| M/S | Master/slave select | Configures device role in cascaded configurations - enables 32-bit+ memory expansion without glue logic |
| VDD, VSS | Power and ground | Multiple VDD/VSS pins distributed across package for low-impedance supply routing and noise reduction |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port memory cells | Enables simultaneous read of identical memory locations by both ports - essential for lock-free status mirroring |
| On-chip port arbitration logic | Resolves contention automatically without external logic or software polling - reduces system latency and firmware complexity |
| Full hardware semaphore support | Eight dedicated flags accessible via A0–A2 and SEM pins - provides atomic test-and-set for multi-processor resource locking |
| Separate upper/lower byte control | Supports 8-bit peripheral interfacing on 16-bit bus - avoids unnecessary full-word writes in microcontroller co-processor systems |
| Master/slave cascading capability | Permits 32-bit or wider memory expansion using multiple IDT70V25S20J8 devices - eliminates need for external bus-width translators |
Applications
| Industrial PLC Data Exchange | Telecom Line Card Buffering |
|---|---|
Use Scenario: Two independent MCUs in a programmable logic controller share real-time I/O status and configuration tables. IC Role / Device Role / Timing Role: Dual-port SRAM acts as coherent shared memory with hardware arbitration, eliminating software mutex overhead. Use Value: 20 ns access ensures sub-microsecond inter-processor message latency, meeting hard real-time scan-cycle deadlines. | Use Scenario: High-speed packet processing ASIC and ARM-based management CPU coordinate frame buffers and statistics in a 10G line card. IC Role / Device Role / Timing Role: IDT70V25S20J8 serves as zero-wait-state buffer with independent read/write ports for concurrent data ingestion and analysis. Use Value: 4K × 16 organization and 20 ns tRC support sustained 50 MB/s throughput per port without pipeline stalls. |
| Avionics Sensor Fusion Hub | Medical Imaging Subsystem |
Use Scenario: Safety-critical flight control processor and redundant monitoring processor exchange sensor fusion results and health status. IC Role / Device Role / Timing Role: Acts as fault-tolerant shared memory with BUSY/INT signaling for deterministic handshaking and error detection. Use Value: –40°C to +85°C rating and 3.3 mW standby power ensure reliable operation in unheated avionics bays with constrained thermal envelopes. | Use Scenario: FPGA-based image acquisition engine and DSP subsystem transfer raw pixel frames and metadata in MRI or CT scanner front-end. IC Role / Device Role / Timing Role: Provides non-blocking memory conduit with semaphore-controlled access to prevent frame corruption during concurrent capture and processing. Use Value: Hardware semaphores reduce software interrupt load by >90% versus polled flag schemes, improving deterministic scheduling of time-critical reconstruction tasks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-20ZXC | 4K × 16, 20 ns, 3.3 V, but uses different pinout (100-pin TQFP variant with distinct signal mapping) and lacks native master/slave BUSY chaining | Requires PCB redesign for pin compatibility; suitable only where cascading is not needed | Select when existing layout accommodates Cypress pin assignment and semaphore logic is implemented externally |
| AS7C34098B-20TIN | 4K × 16, 20 ns, 3.3 V, but no built-in semaphore logic or BUSY arbitration - relies on external logic or software coordination | Increases BOM count and firmware complexity for multi-processor sync; no hardware contention resolution | Choose only for cost-sensitive, single-master systems where arbitration is handled at application layer |
Compared with CY7C1362BV33-20ZXC and AS7C34098B-20TIN, the IDT70V25S20J8 delivers integrated hardware arbitration and semaphore support in a drop-in-capable 100-pin TQFP footprint, reducing system-level design effort and improving determinism in tightly coupled dual-processor architectures.
Availability
IDT70V25S20J8 is available at Aetrix Electronics and suitable for industrial PLC data exchange, telecom line card buffering, and avionics sensor fusion requiring stable component supply and long-term lifecycle assurance.
Supply support for IDT70V25S20J8 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 high-performance computing solutions.
The IDT70V25 family was designed specifically for real-time inter-processor communication in industrial control, telecom infrastructure, and safety-critical embedded systems requiring deterministic dual-port memory access.
FAQ
What is the maximum operating frequency supported by the IDT70V25S20J8?
The IDT70V25S20J8 does not operate on a clock signal - it is a fully asynchronous dual-port SRAM. Its performance is defined by timing parameters: 20 ns maximum read cycle time (tRC) and 20 ns maximum address access time (tAA). This enables reliable operation in systems where either port can initiate reads/writes at any time without synchronization, supporting effective data rates up to 50 MHz in burst-mode applications.
Does the IDT70V25S20J8 support true simultaneous read operations from both ports to the same memory location?
Yes, the IDT70V25S20J8 uses true dual-port memory cells that allow concurrent reads from both left and right ports to the exact same address without contention or data corruption. This capability is fundamental to its use in mirrored status registers and real-time data logging where both processors must observe identical state values with zero propagation delay.
How is semaphore functionality implemented in the IDT70V25S20J8?
The IDT70V25S20J8 integrates eight hardware semaphore flags accessed via A0–A2 address lines and controlled by the SEML/SEMR pins. When SEM is asserted, I/O0 writes to or reads from the selected flag; all I/O pins reflect the flag value during read. This provides atomic test-and-set behavior without software intervention, enabling robust resource locking between independent processors sharing the device.
What is the function of the M/S pin on the IDT70V25S20J8, and how does it affect BUSY signaling?
The M/S pin configures the IDT70V25S20J8 as master (M/S = VIH) or slave (M/S = VIL). In master mode, BUSYL/BUSYR are outputs indicating local port contention; in slave mode, they become inputs accepting BUSY signals from a master device. This enables daisy-chained arbitration across multiple IDT70V25S20J8 devices for wider memory expansion without external logic.
Can the IDT70V25S20J8 be used in systems requiring extended temperature operation beyond commercial grade?
Yes, the IDT70V25S20J8 is rated for industrial temperature range (–40°C to +85°C), as confirmed in the datasheet's "Maximum Operating Temperature" table and "Recommended DC Operating Conditions." This makes it suitable for deployment in outdoor telecom equipment, factory automation controllers, and transportation electronics where ambient conditions exceed standard commercial limits.
70V25S20J8 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:
- 20ns
- Access Time:
- 20 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)
70V25S20J8 FAQ
1.How can I place an order for 70V25S20J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V25S20J8 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 70V25S20J8 reliable?
The price and inventory of 70V25S20J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V25S20J8 is usually 5 days.
3.What payment methods are accepted for 70V25S20J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V25S20J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V25S20J8?
70V25S20J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V25S20J8 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 70V25S20J8?
For technical support, including 70V25S20J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V25S20J8 requirements.
6.How does Aetrix verify that 70V25S20J8 is sourced from the original manufacturer or authorized distributors?
All 70V25S20J8 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 70V25S20J8 meets industry standards.
7.What is the process for return or replacement of 70V25S20J8?
All 70V25S20J8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V25S20J8, 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 70V25S20J8 part is unused and in its original packaging.
Return procedure for 70V25S20J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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