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Renesas 7140LA25PFI
- Part No.:
- 7140LA25PFI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7140LA25PFI.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,126
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Product details
Overview
7140LA25PFI 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 25 ns max read cycle time, 2V data retention capability, and industrial temperature range (–40°C to +85°C) in a 48-pin plastic DIP package for real-time inter-processor communication.
For engineers reviewing the 7140LA25PFI datasheet, 7140LA25PFI pinout, 7140LA25PFI application, or 7140LA25PFI equivalent, key selection criteria include BUSY input timing compatibility with IDT7130 master arbitration, low-power standby current (1 µA typical full standby), TTL-compatible 5V ±10% operation, and dual-port contention resolution without external logic.
Technical Context
The 7140LA25PFI operates as a SLAVE dual-port SRAM with dedicated BUSY inputs (BUSYL, BUSYR) that inhibit writes when asserted low-unlike the MASTER IDT7130 which drives open-drain BUSY outputs. It requires external pull-up resistors on BUSY pins per datasheet Note 2.
Its arbitration logic responds only to address match events from the MASTER port; it does not generate BUSY signals but accepts them to gate write operations. The device supports battery backup via 2V data retention mode with tCDR = 0 ns chip deselect-to-retention transition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), enabling compact dual-access buffer storage |
| Access Time | 25 ns max read cycle time (tRC), defining minimum clock period for synchronous interface integration |
| Supply Voltage | 5.0 V ±10%, compatible with standard TTL logic families without level translation |
| Operating Temp | –40°C to +85°C industrial grade, qualifying for embedded control and instrumentation environments |
| Standby Current | 1 µA typical full standby (ISB3), enabling ultra-low-power battery-backed operation |
| Data Retention | 2.0 V minimum VCC for data retention, allowing direct connection to coin-cell backup sources |
| Package | 48-pin plastic DIP (PDG48), providing through-hole mounting and legacy system compatibility |
Pinout & Package
48-pin plastic DIP (PDG48) package with 0.600-inch width, 0.19-inch height, and standard DIP footprint for PCB layout reuse.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1, 24) | Ground reference | Two dedicated ground pins reduce ground bounce during simultaneous port switching |
| VCC (Pin 23) | Power supply | Single 5V supply powers both ports; all VCC pins must be decoupled locally |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; independent control allows interleaved access |
| OEL / OER | Output enable (left/right) | Active-low gates I/O drivers; high-Z state prevents bus contention during idle |
| R/WL / R/WR | Read/write direction (left/right) | High = read, low = write; controls internal data path without OE dependency |
| BUSYL / BUSYR | Busy input (left/right) | Active-low write-inhibit signal from MASTER IDT7130; requires external pull-up |
| INTL / INTR | Interrupt flag (left/right) | Open-drain output indicating port-to-port interrupt event; needs pull-up resistor |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit addressing per port; no internal address latching-requires stable setup |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (bidirectional) | True bidirectional bus; direction controlled solely by R/W and CE, not OE |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration support | Accepts BUSY inputs from IDT7130 MASTER to automatically block conflicting writes-eliminates need for external arbitration logic |
| 2V data retention | Maintains stored data at 2.0 V VCC, enabling seamless switchover to backup battery without volatile loss |
| Ultra-low standby power | 1 µA typical ISB3 current allows >10-year battery life in maintenance-free backup applications |
| TTL-compatible interface | Direct connection to 5V microcontrollers and FPGAs without level shifters or bus buffers |
| Industrial temperature rating | Validated operation from –40°C to +85°C ensures reliability in motor drives, PLCs, and outdoor equipment |
Applications
| Real-Time Inter-Processor Communication | Digital Signal Processing Buffer |
|---|---|
Use Scenario: Two independent processors (e.g., ARM Cortex-M7 and DSP) share sensor data and control commands via shared memory without software handshaking. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM provides non-blocking, low-latency memory access with hardware-enforced write arbitration via BUSY inputs. Use Value: Eliminates CPU polling and reduces inter-processor latency to ≤25 ns, enabling deterministic response in closed-loop control systems. | Use Scenario: Audio codec transfers PCM samples between ADC and DAC subsystems using ping-pong buffering with zero-copy DMA. IC Role / Device Role / Timing Role: Dual-port SRAM acts as a synchronized FIFO buffer where one port handles incoming samples while the other feeds playback engine. Use Value: Prevents sample dropouts during burst transfers by decoupling read/write timing domains-no external glue logic required. |
| Redundant Control System Memory | Legacy Industrial Controller Upgrade |
Use Scenario: Safety-critical PLC uses dual CPUs running identical firmware; memory coherency maintained via mirrored dual-port access. IC Role / Device Role / Timing Role: 7140LA25PFI serves as fault-tolerant shared memory with automatic write blocking during address contention. Use Value: Guarantees atomic updates across redundant paths-prevents inconsistent state propagation during failover transitions. | Use Scenario: Retrofit of aging CNC controller replaces discrete logic-based memory expansion with integrated MASTER/SLAVE dual-port architecture. IC Role / Device Role / Timing Role: SLAVE device expands data bus width from 8-bit to 16-bit when paired with IDT7130SA25PFI MASTER. Use Value: Reduces board space by 40% and eliminates timing skew issues inherent in discrete address decoder + latch solutions. |
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 | 5V CMOS, 1K × 8, 25 ns, but lacks 2V data retention and BUSY arbitration inputs | Requires external arbitration logic and separate battery management circuitry | Choose only if legacy Cypress footprint compatibility is mandatory and backup retention is unnecessary |
| AS7C31025B-25JC | 5V, 1K × 8, 25 ns, no BUSY signaling; supports JTAG boundary scan | No hardware contention resolution-software-managed arbitration increases latency and complexity | Select when testability (JTAG) outweighs real-time arbitration needs and power budget permits higher standby draw |
Compared with CY7C135-25JC and AS7C31025B-25JC, the 7140LA25PFI uniquely integrates BUSY-input arbitration and 2V data retention in a single 48-pin DIP, reducing BOM count and enabling true zero-software-overhead inter-processor communication.
Availability
7140LA25PFI is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffers, redundant control system memory, and legacy industrial controller upgrades requiring stable component supply across extended production lifecycles.
Supply support for 7140LA25PFI 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 memory, timing, and interface solutions for communications, computing, and industrial markets.
The IDT7140 product line delivers dual-port SRAMs optimized for MASTER/SLAVE memory expansion architectures-designed specifically to eliminate external arbitration logic in multi-processor and real-time embedded systems.
FAQ
What is the function of BUSYL and BUSYR pins on the 7140LA25PFI?
BUSYL and BUSYR are active-low BUSY input pins on the 7140LA25PFI. When asserted low, they inhibit write operations to the corresponding port-this is how the SLAVE device receives arbitration control from the MASTER IDT7130. Per datasheet Note 2, these open-drain inputs require external pull-up resistors to VCC.
Does the 7140LA25PFI support battery backup operation?
Yes, the 7140LA25PFI supports battery backup operation with guaranteed data retention down to 2.0 V VCC. This is a feature exclusive to LA-grade devices (not SA variants). The 7140LA25PFI draws only 100 µA typical ICCDR at 2.0 V, enabling long-term retention from primary or backup cells.
Can the 7140LA25PFI operate as a standalone dual-port RAM without an IDT7130 MASTER?
Yes, the 7140LA25PFI can operate standalone as an 8-bit dual-port SRAM. However, its BUSY inputs must be held high (via pull-ups) since no external arbitration source is present. In this mode, users must manage address/contention externally-unlike MASTER/SLAVE configurations where arbitration is hardware-automated.
What is the maximum operating temperature range for the 7140LA25PFI?
The 7140LA25PFI is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in Table 03 ("Recommended Operating Temperature") and applies to all LA-speed grades including the 25 ns variant. Commercial and military grades exist but use different suffixes.
Which package type does the 7140LA25PFI use, and what are its mechanical dimensions?
The 7140LA25PFI uses a 48-pin plastic DIP (PDG48) package. Per datasheet Note 3, its body dimensions are approximately 0.55 inch × 0.61 inch × 0.19 inch (13.97 mm × 15.49 mm × 4.83 mm), conforming to standard through-hole DIP footprints for legacy board compatibility.
7140LA25PFI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- 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:
- 64-TQFP (14x14)
7140LA25PFI FAQ
1.How can I place an order for 7140LA25PFI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA25PFI 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 7140LA25PFI reliable?
The price and inventory of 7140LA25PFI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA25PFI is usually 5 days.
3.What payment methods are accepted for 7140LA25PFI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA25PFI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA25PFI?
7140LA25PFI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA25PFI 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 7140LA25PFI?
For technical support, including 7140LA25PFI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA25PFI requirements.
6.How does Aetrix verify that 7140LA25PFI is sourced from the original manufacturer or authorized distributors?
All 7140LA25PFI 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 7140LA25PFI meets industry standards.
7.What is the process for return or replacement of 7140LA25PFI?
All 7140LA25PFI units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA25PFI, 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 7140LA25PFI part is unused and in its original packaging.
Return procedure for 7140LA25PFI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA25PFI Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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