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Renesas 7140LA25JI
- Part No.:
- 7140LA25JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140LA25JI.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,226
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Product details
Overview
7140LA25JI from IDT is a 1K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting fully asynchronous left/right port access with 25ns max read cycle time, 1mW typical standby power, and 2V battery backup data retention. It operates on single 5V ±10% supply across –40°C to +85°C industrial temperature range and is used in real-time interprocessor communication subsystems requiring concurrent read/write without external arbitration logic.
For engineers reviewing the 7140LA25JI datasheet, 7140LA25JI pinout, 7140LA25JI application, or 7140LA25JI equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-temperature operation, battery-retention capability, and exact SLAVE-side BUSY input behavior - all critical for deterministic dual-port memory integration in embedded control and avionics data buffers.
Technical Context
The 7140LA25JI implements two independent TTL-compatible ports (left and right), each with dedicated address (A0–A9), data (I/O0–I/O7), and control lines (CEL/CER, OEL/OER, R/WL/R/WR). Its SLAVE role means BUSYL and BUSYR are inputs-not outputs-used to inhibit writes during contention, unlike the MASTER IDT7130 which drives BUSY signals.
Arbitration is handled externally via the MASTER's BUSY outputs feeding into the 7140LA25JI's BUSY inputs; internal port-to-port timing parameters-including tWB (write-to-BUSY input delay), tWDD (write pulse to data delay), and tDDD (write data valid to read data delay)-are specified at 25ns speed grade and validated for industrial temperature operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit data width per port) |
| Access Time | 25ns maximum read cycle time (tRC) - defines minimum clock period for synchronous interface or maximum toggle rate for asynchronous burst reads |
| Supply Voltage | 5.0V ±10% - requires single-rail 4.5–5.5V supply; no separate I/O or core voltage rails |
| Standby Current | 1mW typical (≈200µA at 5V) - enables ultra-low-power hold mode during processor sleep in battery-backed systems |
| Data Retention | 2.0V minimum VCC - retains memory contents down to 2V supply, enabling seamless switchover to backup battery |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade deployment in motor drives, PLCs, and ruggedized communications equipment |
| Port Configuration | SLAVE-only dual-port - accepts BUSY inputs (BUSYL/BUSYR) to gate writes; no internal arbitration logic or BUSY output drivers |
Pinout & Package
7140LA25JI is packaged in a 48-pin ceramic flatpack (FP48), measuring approximately 0.75 in × 0.75 in × 0.11 in, with lead finish suitable for high-reliability soldering and hermetic sealing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | All GND pins must be connected to system ground plane; multiple pins ensure low-impedance return path for both ports |
| VCC | Power supply | All VCC pins require decoupling (0.1µF ceramic + 10µF tantalum) near package; failure causes functional instability or latch-up |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; when high, port enters ISB1 standby (≈25mA) or ISB3 full standby (≈0.2mA with CMOS-level inputs) |
| OEL / OER | Output enable (left/right) | Active-low controls I/O bus drivers; high-Z state prevents bus contention during multi-port sharing |
| R/WL / R/WR | Read/write direction (left/right) | High = read, low = write; must remain stable during address and CE transitions to avoid metastability or invalid data capture |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address bus per port; supports full 1K address space; no internal address latching - addresses must be held stable during access windows |
| I/O0L–I/O7L / I/O0R–I/O7R | Bidirectional data (left/right) | CMOS-compatible 8-bit I/O; driven only when OE and CE active low and R/W indicates read; tri-stated otherwise |
| BUSYL / BUSYR | BUSY input (left/right) | SLAVE-only function: low = write inhibited on corresponding port; requires pull-up resistor if driven open-drain by MASTER (IDT7130) |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs asserted low to signal inter-port events (e.g., flag set/clear); require external pull-up for proper logic level |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port SLAVE architecture | Enables scalable 16-bit+ memory width using IDT7130 MASTER without discrete glue logic or timing-critical arbitration circuits |
| 2V data retention | Guarantees nonvolatile memory hold during main power loss - critical for fault logging and state recovery in industrial controllers |
| Industrial temperature support | Validated operation from –40°C to +85°C ensures reliability in uncontrolled environments like factory automation and outdoor telecom nodes |
| Ultra-low standby power | 1mW typical (ISB3) reduces thermal load and extends battery life in always-on monitoring systems with infrequent memory access |
| TTL-compatible signaling | Direct interface with legacy microcontrollers and FPGAs without level-shifting; VIH = 2.2V min, VIL = 0.8V max simplifies drive requirements |
Applications
| Real-Time Interprocessor Communication | Redundant Control System Memory Buffer |
|---|---|
|
Use Scenario: Two independent MCUs exchange status, commands, and sensor data via shared memory without software handshaking or polling overhead. IC Role / Device Role / Timing Role: 7140LA25JI serves as SLAVE port in a MASTER/SLAVE pair with IDT7130, accepting BUSY-controlled writes and providing simultaneous read access to both processors. Use Value: Eliminates need for semaphores or interrupt-driven coordination; 25ns access enables sub-microsecond data transfer latency between safety-critical control loops. |
Use Scenario: Primary and backup controllers maintain synchronized state in rail signaling or aerospace flight computers using mirrored memory regions. IC Role / Device Role / Timing Role: 7140LA25JI provides one half of a dual-port buffer where primary writes and backup reads occur concurrently under BUSY-gated arbitration. Use Value: Enables zero-downtime failover: backup controller reads latest state while primary writes new updates - all within deterministic 25ns timing bounds. |
| Battery-Backed Event Logger | Industrial PLC Dual-Port Data Exchange |
|
Use Scenario: Programmable logic controller logs fault timestamps and operational parameters during AC power loss using onboard coin-cell battery. IC Role / Device Role / Timing Role: 7140LA25JI retains 1K of critical event history at 2V supply, with low 200µA retention current minimizing battery drain over years. Use Value: Guarantees forensic data integrity after extended brownouts - no volatile SRAM refresh circuitry required, reducing BOM and layout complexity. |
Use Scenario: Modular PLC backplane connects CPU, I/O modules, and motion controllers via shared memory mapped over dual-port SRAM. IC Role / Device Role / Timing Role: 7140LA25JI acts as SLAVE in multi-drop dual-port configuration, allowing CPU to write commands while I/O modules read status in parallel. Use Value: Achieves deterministic 25ns inter-module data exchange - faster than CAN FD or EtherCAT mailbox protocols - for high-speed motion profiling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C135-25JC | 25ns access, 1K × 8, but uses 3-state BUSY outputs (not inputs); requires external arbitration logic for SLAVE-equivalent behavior | Not drop-in: lacks native SLAVE BUSY-input gating; needs additional logic to replicate 7140LA25JI's contention-handling behavior | Select only if redesigning arbitration layer is acceptable and CY7C135's JEDEC-standard PLCC-44 footprint aligns with existing layout |
| IDT7142LA25JI | Same SLAVE architecture and pinout, but 2K × 8 capacity; identical 25ns timing, 2V retention, and industrial temp rating | Direct upgrade path: doubles memory depth while preserving timing, power, and interface compatibility | Choose when application requires >1K data buffering without changing PCB layout or firmware memory map structure |
Compared with CY7C135-25JC and IDT7142LA25JI, the 7140LA25JI uniquely delivers true SLAVE-side BUSY input gating in a 48-pin flatpack - eliminating external arbitration components and enabling immediate use in legacy IDT7130-based systems without timing recalculations or layout changes.
Availability
7140LA25JI is available at Aetrix Electronics and suitable for real-time interprocessor communication, battery-backed event logging, and industrial PLC dual-port data exchange requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial-temperature performance.
Supply support for 7140LA25JI 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 high-performance timing, memory, and interface solutions, now part of Renesas Electronics.
The IDT7140 family was designed specifically for deterministic dual-port memory expansion in safety-critical embedded systems - emphasizing low-latency arbitration, battery retention, and industrial-grade reliability without external logic.
FAQ
What is the role of 7140LA25JI in a MASTER/SLAVE dual-port memory system?
The 7140LA25JI functions exclusively as the SLAVE device: it receives BUSY signals (BUSYL/BUSYR) from the MASTER IDT7130 to gate writes during address contention, has no internal arbitration logic, and relies on external BUSY inputs to enforce deterministic access ordering. This eliminates need for discrete arbitration chips in 16-bit+ memory expansions.
Does 7140LA25JI support battery backup, and what is the minimum retention voltage?
Yes, the 7140LA25JI supports battery backup with guaranteed data retention down to 2.0V VCC (VDR), consuming ≤4000µA at 2V in industrial temperature range. This allows direct connection to a 3V coin cell through a diode or LDO, maintaining memory state during main power failure without external refresh circuitry.
What is the meaning of BUSYL and BUSYR pins on 7140LA25JI?
On the 7140LA25JI, BUSYL and BUSYR are inputs - not outputs - used to inhibit writes on the left or right port respectively. When pulled low (e.g., by IDT7130's open-drain BUSY output), the corresponding port ignores R/WL/R/WR transitions and holds data stable. Pull-up resistors are required on these lines for proper operation.
Can 7140LA25JI operate across the full industrial temperature range?
Yes, the 7140LA25JI is fully specified and tested for operation from –40°C to +85°C, including all DC and AC parameters (e.g., 25ns tRC, 1mW standby, 2V retention). This qualification meets industrial standards for programmable logic controllers, motor drives, and outdoor base station equipment.
How does the 7140LA25JI differ from the IDT7130 in pin functionality?
The 7140LA25JI omits on-chip arbitration logic and replaces BUSY outputs with BUSY inputs (BUSYL/BUSYR), removes the INT output driver on the MASTER side, and lacks the IDT7130's internal priority resolution. Its pinout matches the IDT7130 for mechanical compatibility but reassigns BUSY pins strictly as SLAVE control inputs - requiring external pull-ups and MASTER-driven assertion.
7140LA25JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tube
- 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)
7140LA25JI FAQ
1.How can I place an order for 7140LA25JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA25JI 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 7140LA25JI reliable?
The price and inventory of 7140LA25JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA25JI is usually 5 days.
3.What payment methods are accepted for 7140LA25JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA25JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA25JI?
7140LA25JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA25JI 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 7140LA25JI?
For technical support, including 7140LA25JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA25JI requirements.
6.How does Aetrix verify that 7140LA25JI is sourced from the original manufacturer or authorized distributors?
All 7140LA25JI 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 7140LA25JI meets industry standards.
7.What is the process for return or replacement of 7140LA25JI?
All 7140LA25JI units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA25JI, 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 7140LA25JI part is unused and in its original packaging.
Return procedure for 7140LA25JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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