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Renesas 7140SA25JI8
- Part No.:
- 7140SA25JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140SA25JI8.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
7140SA25JI8 from IDT is a 1K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting independent asynchronous access on left and right ports with 25ns max read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C) - used in real-time inter-processor communication and shared-memory embedded controllers.
For engineers reviewing the 7140SA25JI8 datasheet, 7140SA25JI8 pinout, 7140SA25JI8 application, or 7140SA25JI8 equivalent, this page delivers verified electrical specs, port arbitration behavior, BUSY input timing, industrial-grade reliability data, and direct alternative part comparisons for dual-port SRAM selection in deterministic multi-core or FPGA-CPU co-processing designs.
Technical Context
The 7140SA25JI8 operates as a SLAVE dual-port SRAM with dedicated BUSY input pins (BUSYL, BUSYR) that inhibit writes when asserted low - unlike the MASTER IDT7130 which drives BUSY outputs. Its arbitration logic responds only to external BUSY signals, not internal contention detection.
It supports fully asynchronous R/W control per port, with separate CE, OE, and R/W lines for each side, enabling concurrent read/write operations across ports when no address conflict occurs; write-to-read propagation delay (tDDD) is 35ns max at 25ns speed grade, critical for low-latency inter-processor handshaking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), providing compact shared buffer space for dual-processor synchronization without external width expansion logic. |
| Access Time | 25ns maximum read cycle time (tRC), enabling integration into 40MHz bus systems with guaranteed timing margin under industrial temperature conditions. |
| Supply Voltage | 5.0V ±10% (4.5V–5.5V), compatible with legacy TTL and mixed-signal 5V system rails without level-shifting. |
| Operating Temp | –40°C to +85°C, qualified for industrial automation, motor control, and transportation electronics where ambient thermal cycling exceeds commercial grade limits. |
| Standby Current | 25mA max (ISB1, TTL-level inputs), enabling low-power sleep modes in battery-backed or energy-conscious embedded systems. |
| BUSY Role | Input-only (not output): BUSYL/BUSYR must be driven externally (e.g., by IDT7130 MASTER) to block writes during address contention - no internal arbitration logic. |
| Package | 48-pin ceramic flatpack (FP48), hermetically sealed for high-reliability applications requiring moisture resistance and long-term stability. |
Pinout & Package
48-pin ceramic flatpack (FP48) package with 0.75″ × 0.75″ body size and side-brazed leads; pin 1 index corner marked, all VCC pins require local decoupling, all GND pins must be connected to common ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 25, 48) | Ground reference | Four dedicated ground connections minimize ground bounce and ensure stable I/O thresholds during simultaneous port access. |
| VCC (Pins 23, 26) | Power supply | Dual VCC pins reduce IR drop and support localized 0.1µF ceramic decoupling near each power entry point. |
| CEL / CER | Chip enable (left/right) | Active-low enables isolate each port's memory array; required HIGH to enter standby mode and achieve ISB1/ISB3 current levels. |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers independently; allows one port to drive data while the other remains high-Z for bus sharing. |
| R/WL / R/WR | Read/write direction (left/right) | High = read, low = write; determines data flow direction per port without requiring external direction control logic. |
| BUSYL / BUSYR | BUSY input (left/right) | Active-low inputs that internally inhibit writes when asserted - must be driven by external MASTER device (e.g., IDT7130) during address conflicts. |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs signaling inter-port events; require external pull-up resistors to generate interrupt requests to host processors. |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses (0–1023) per port; no internal address latching - addresses must remain stable throughout tAA and tACE windows. |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data paths with tristate control; share same pins for read and write, eliminating need for separate DQ/DQ̅ lines. |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only architecture | Eliminates redundant arbitration logic - reduces die area, power, and complexity when paired with IDT7130 MASTER in 16-bit+ systems. |
| Asynchronous dual-port operation | Enables true concurrent access: left port can read while right port writes to non-overlapping addresses, maximizing throughput in real-time IPC. |
| External BUSY-driven write inhibition | Guarantees deterministic resolution of address contention via external signal coordination, avoiding race conditions inherent in distributed arbitration. |
| TTL-compatible interface | Direct connection to legacy microcontrollers, FPGAs, and ASICs without level translators - VIH = 2.2V min, VIL = 0.8V max at 5V supply. |
| Industrial temperature qualification | Validated operation from –40°C to +85°C ensures reliability in factory-floor PLCs, railway signaling, and outdoor telecom equipment. |
Applications
| Real-Time Inter-Processor Communication | Digital Signal Processing Buffering |
|---|---|
Use Scenario: Two microcontrollers exchange sensor data and control commands via shared memory with minimal latency and no software polling overhead. IC Role / Device Role / Timing Role: 7140SA25JI8 serves as SLAVE port in MASTER/SLAVE pair with IDT7130, accepting writes from MASTER and providing reads to secondary CPU. Use Value: 25ns tRC and deterministic BUSY-controlled arbitration eliminate bus locking, enabling sub-100ns inter-core message turnaround. | Use Scenario: An FPGA-based DSP engine streams filtered audio samples to a host ARM processor for display and logging. IC Role / Device Role / Timing Role: 7140SA25JI8 provides dual-access buffer between FPGA (writing processed frames) and ARM (reading for playback). Use Value: Independent left/right ports allow continuous write streaming and non-blocking read access, sustaining 40MB/s effective throughput. |
| Motor Control Co-Processor Interface | Redundant Safety Controller Synchronization |
Use Scenario: A safety-certified MCU monitors real-time motor position feedback while a performance MCU executes PID loops - both access shared status registers. IC Role / Device Role / Timing Role: 7140SA25JI8 acts as SLAVE in dual-ported memory subsystem, with safety MCU reading status and performance MCU writing updates. Use Value: BUSY input coordination prevents corrupted writes during concurrent access, satisfying IEC 61508 SIL-3 data integrity requirements. | Use Scenario: Dual lockstep microcontrollers compare results in real time using shared memory to detect divergence before actuation. IC Role / Device Role / Timing Role: 7140SA25JI8 provides atomic read-modify-write capability via port arbitration, ensuring synchronized state snapshots. Use Value: tAPS = 5ns setup guarantees priority resolution within nanosecond-scale timing budgets required for functional safety diagnostics. |
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-25AXC | 5V, 2K × 16, 25ns, TQFP-100; includes on-chip arbitration and BUSY output - functions as standalone MASTER/SLAVE unit. | Requires no companion chip; supports wider data bus but occupies larger PCB area and consumes higher active current (120mA vs. 110mA). | Select when expanding beyond 1K×8 or needing integrated arbitration without external MASTER. |
| AS7C31026B-25JCIN | 3.3V, 1K × 16, 25ns, SOJ-44; CMOS-only interface, no BUSY arbitration - relies on external logic or software coordination. | Lower power (ISB = 1µA) and voltage compatibility with modern low-voltage SoCs, but lacks hardware contention management. | Select for 3.3V systems where deterministic hardware arbitration is handled elsewhere or unnecessary. |
Compared with CY7C024AV-25AXC and AS7C31026B-25JCIN, the 7140SA25JI8 offers unique SLAVE-only simplicity and proven industrial reliability in ceramic FP48 packaging - ideal when pairing with IDT7130 MASTER for cost-optimized, high-integrity 1K×8 shared memory.
Availability
7140SA25JI8 is available at Aetrix Electronics and suitable for industrial motor control, real-time inter-processor communication, and safety-critical embedded systems requiring stable component supply across extended product lifecycles.
Supply support for 7140SA25JI8 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
IDT (Integrated Device Technology) is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance silicon solutions for communications, computing, and industrial markets.
The IDT7140 product line delivers dual-port SRAMs optimized for deterministic, low-latency inter-processor communication - designed specifically for MASTER/SLAVE expansion architectures in ruggedized embedded systems.
FAQ
What is the role of 7140SA25JI8 in a MASTER/SLAVE dual-port SRAM configuration?
The 7140SA25JI8 functions exclusively as a SLAVE device - it accepts BUSY input signals (BUSYL/BUSYR) from a MASTER device like the IDT7130 to inhibit writes during address contention. It contains no internal arbitration logic and relies entirely on external BUSY coordination, making it simpler and lower-power than standalone dual-port SRAMs. This architecture ensures deterministic resolution of port conflicts in real-time systems.
Does 7140SA25JI8 support battery backup data retention?
No, the 7140SA25JI8 does not support battery backup data retention. That feature is exclusive to the LA (low-power) variants such as 7140LA25JI8, which guarantee data retention down to 2.0V. The 'SA' suffix indicates standard active power consumption (550mW typ.) and operation only within the normal 4.5V–5.5V supply range - no sub-3V retention mode is implemented in the 7140SA25JI8.
What is the maximum operating temperature range certified for 7140SA25JI8?
7140SA25JI8 is certified for industrial temperature operation from –40°C to +85°C. This rating is explicitly confirmed in the datasheet's "Recommended Operating Temperature" table and applies to all SA-speed grades including the 25ns version. It is not rated for military (–55°C to +125°C) or extended commercial (0°C to +70°C only) ranges - the 'I' in the part number suffix 'JI8' denotes industrial qualification.
Can 7140SA25JI8 operate as a standalone dual-port SRAM without a MASTER device?
No, 7140SA25JI8 cannot operate reliably as a standalone dual-port SRAM. Its BUSYL and BUSYR pins are inputs only - they must be actively driven by an external MASTER device (e.g., IDT7130) to manage address contention. Without those BUSY signals, simultaneous writes to the same address will result in undefined or corrupted data, as the 7140SA25JI8 has no internal mechanism to detect or resolve conflicts.
What package type is used for 7140SA25JI8, and what are its mechanical characteristics?
7140SA25JI8 uses a 48-pin ceramic flatpack (FP48) package with dimensions approximately 0.75 inch × 0.75 inch × 0.11 inch. It features side-brazed leads, hermetic sealing, and a ceramic body - providing superior moisture resistance, thermal stability, and long-term reliability for aerospace, defense, and industrial applications where plastic packages are unsuitable.
7140SA25JI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-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:
- 8Kbit
- Memory Organization:
- 1K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
7140SA25JI8 FAQ
1.How can I place an order for 7140SA25JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA25JI8 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 7140SA25JI8 reliable?
The price and inventory of 7140SA25JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA25JI8 is usually 5 days.
3.What payment methods are accepted for 7140SA25JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA25JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA25JI8?
7140SA25JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA25JI8 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 7140SA25JI8?
For technical support, including 7140SA25JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA25JI8 requirements.
6.How does Aetrix verify that 7140SA25JI8 is sourced from the original manufacturer or authorized distributors?
All 7140SA25JI8 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 7140SA25JI8 meets industry standards.
7.What is the process for return or replacement of 7140SA25JI8?
All 7140SA25JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA25JI8, 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 7140SA25JI8 part is unused and in its original packaging.
Return procedure for 7140SA25JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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