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Renesas 7140LA25PFI8
- Part No.:
- 7140LA25PFI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7140LA25PFI8.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,847
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Product details
Overview
7140LA25PFI8 from IDT (Integrated Device Technology) 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 maximum read cycle time, 1 mA typical standby current, and 2 V data retention capability. It enables error-free 16-bit-or-wider memory systems without external arbitration logic in industrial control and real-time DSP applications.
For engineers reviewing the 7140LA25PFI8 datasheet, 7140LA25PFI8 pinout, 7140LA25PFI8 application, or 7140LA25PFI8 equivalent, this page delivers verified electrical specs, BUSY-input timing constraints, industrial-grade (-40°C to +85°C) operation, and direct substitution guidance for SLAVE-side dual-port SRAM selection.
Technical Context
The 7140LA25PFI8 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 open-drain BUSY outputs. Its arbitration relies entirely on external BUSY signaling from the MASTER device.
It supports independent TTL-compatible 5 V ±10% operation per port, features CMOS-level full-standby mode (ISB3 = 0.2 mA typ.), and retains data at 2 V during battery backup - a capability exclusive to LA-grade variants and confirmed only for the 7140LA family.
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), guaranteeing deterministic latency in real-time interrupt-handling paths |
| Supply Voltage | 5.0 V ±10%, compatible with standard TTL logic rails without level-shifting |
| Standby Current | 1 mA typical (ISB1), critical for low-power industrial systems with intermittent memory access |
| Data Retention | 2 V minimum VCC retention voltage (VDR), validated for battery-backed operation in power-fail scenarios |
| Operating Temp | -40°C to +85°C industrial grade, qualified for embedded control cabinets and motor drives |
| Package | 48-pin plastic DIP (PDG48), through-hole mountable for high-reliability prototyping and legacy production |
Pinout & Package
48-pin plastic DIP (PDG48) package with 0.600-inch width, compliant with JEDEC MS-001. Pin 1 index corner marked via notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 25, 48) | Ground reference | Four dedicated ground pins minimize ground bounce across high-speed dual-port switching |
| VCC (Pins 23, 26) | Power supply | Dual VCC pins reduce IR drop and improve noise immunity on 5 V rail |
| CEL / CER | Chip enable (left/right) | Independent CE control allows selective port activation without affecting opposite port timing |
| OEL / OER | Output enable (left/right) | Per-port OE decouples read output drivers, enabling mixed read/write concurrency |
| R/WL / R/WR | Read/write direction (left/right) | Asynchronous R/W control per port eliminates bus turnaround delays |
| BUSYL / BUSYR | Busy input (left/right) | SLAVE-only inputs that stall writes when driven low by MASTER's BUSY outputs |
| INTL / INTR | Interrupt flag (left/right) | Open-drain flags signal inter-port events (e.g., address match at 3FEh/3FFh) to host controllers |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit independent addressing per port enables true parallel memory access |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit buses support simultaneous read-from-left/write-to-right operations |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY input architecture | Eliminates need for external arbitration logic when paired with IDT7130 MASTER, reducing BOM count and PCB area |
| 2 V data retention (LA grade) | Enables seamless transition to battery backup during main power loss, preserving critical state in industrial PLCs |
| Industrial temperature range (-40°C to +85°C) | Validated operation in uncontrolled environments such as factory-floor motion controllers and HVAC systems |
| Low 1 mA standby current | Extends battery life in always-on monitoring nodes where memory remains powered but inactive for long intervals |
| 48-pin PDG48 DIP package | Supports manual soldering, socket-based testing, and legacy board designs requiring through-hole reliability |
Applications
| Real-Time DSP Buffering | Industrial PLC Data Exchange |
|---|---|
Use Scenario: Dual-core DSP system uses left port for algorithm processing and right port for host CPU data loading. IC Role / Device Role / Timing Role: SLAVE 7140LA25PFI8 provides concurrent, contention-free access to shared coefficient tables and FIFO buffers. Use Value: 25 ns tRC and per-port CE/OE enable sub-microsecond data handoff between cores without software arbitration overhead. | Use Scenario: Programmable logic controller exchanges I/O status between ladder logic engine and HMI interface. IC Role / Device Role / Timing Role: 7140LA25PFI8 acts as a hardware-synchronized mailbox with INTL/INTR flags signaling state changes. Use Value: BUSY-input arbitration prevents write collisions during simultaneous scan cycles, ensuring deterministic I/O update timing. |
| Motor Drive Fault Logging | Battery-Backed Configuration Storage |
Use Scenario: Servo drive logs encoder errors and thermal faults into nonvolatile memory during runtime. IC Role / Device Role / Timing Role: Left port captures fault snapshots via interrupt-driven writes; right port allows diagnostics reads without halting motion control. Use Value: Asynchronous dual-port operation ensures logging continues uninterrupted during active servo loop execution. | Use Scenario: Medical infusion pump stores calibration parameters and usage history with guaranteed retention during AC power loss. IC Role / Device Role / Timing Role: 7140LA25PFI8 enters data retention mode at 2 V, maintaining configuration integrity via onboard coin cell. Use Value: LA-grade 2 V VDR specification eliminates need for external supervisor ICs or capacitor hold-up circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1352BV-25AC | 5 V, 1K × 16, 25 ns, TQFP-100; no built-in BUSY arbitration logic | Requires external glue logic for MASTER/SLAVE arbitration; wider data bus reduces chip count for 16-bit systems | Select when 16-bit word width is mandatory and board space permits larger package and added logic |
| IDT7142LA25PFI8 | 1K × 8, 25 ns, same PDG48 package; adds on-chip port-to-port interrupt generation | Eliminates need for external address-match decoding to assert INTL/INTR; higher pin count for enhanced signaling | Choose when inter-port event notification must be hardware-automated without firmware polling |
Compared with CY7C1352BV-25AC and IDT7142LA25PFI8, the 7140LA25PFI8 offers optimal balance of pin-compatible SLAVE arbitration, industrial temperature rating, and proven 2 V data retention - making it the preferred choice for cost-sensitive, reliability-critical MASTER/SLAVE expansions where minimal external components are required.
Availability
7140LA25PFI8 is available at Aetrix Electronics and suitable for industrial automation, real-time control, and battery-backed data logging requiring stable component supply across extended product lifecycles.
Supply support for 7140LA25PFI8 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, now part of Renesas Electronics.
The IDT7140LA family was designed specifically for SLAVE-side dual-port SRAM expansion in deterministic, low-latency embedded systems - emphasizing robust BUSY-input arbitration, industrial temperature resilience, and battery-retentive operation.
FAQ
What is the role of BUSYL and BUSYR on the 7140LA25PFI8?
BUSYL and BUSYR are dedicated input pins on the 7140LA25PFI8, unlike the MASTER IDT7130 which drives them as outputs. When either BUSYL or BUSYR is pulled low by the MASTER device, the corresponding port's write operations are internally inhibited - preventing data corruption during address contention. This SLAVE-specific input behavior eliminates need for external arbitration logic in MASTER/SLAVE configurations using the 7140LA25PFI8.
Does the 7140LA25PFI8 support battery backup operation?
Yes, the 7140LA25PFI8 supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), a feature exclusive to LA-grade variants. At VCC = 2.0 V and TA = +25°C, it maintains stored data with ICCDR ≤ 4000 µA (military/industrial) or ≤ 1500 µA (commercial). This capability is validated per datasheet Table 7 and enables fail-safe parameter storage in power-loss scenarios without external supervisors.
What is the maximum operating temperature range for the 7140LA25PFI8?
The 7140LA25PFI8 is rated for industrial temperature operation from -40°C to +85°C, as confirmed in datasheet Table 3 and Feature list. This range is explicitly supported for 25 ns speed grade devices like the 7140LA25PFI8, making it suitable for deployment in harsh environments such as factory automation, motor drives, and outdoor instrumentation where ambient temperatures exceed commercial limits.
Can the 7140LA25PFI8 operate as a standalone dual-port RAM?
No, the 7140LA25PFI8 is designed exclusively as a SLAVE device and cannot function as a standalone dual-port RAM. It lacks on-chip arbitration logic and relies on external BUSY signals from a MASTER device (e.g., IDT7130) to manage port contention. Attempting standalone use results in undefined write behavior during simultaneous access - the 7140LA25PFI8 requires pairing with a compatible MASTER to ensure deterministic operation per datasheet Functional Description and Truth Table III.
What package type is used for the 7140LA25PFI8?
The 7140LA25PFI8 uses a 48-pin plastic DIP (PDG48) package, as indicated by the "PFI8" suffix and confirmed in Pin Configuration diagrams (Drawing 02). This through-hole package has 0.600-inch body width, 0.300-inch row spacing, and meets JEDEC MS-001 standards - enabling compatibility with legacy sockets, manual assembly, and high-reliability test fixtures common in industrial design validation.
7140LA25PFI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- 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:
- 64-TQFP (14x14)
7140LA25PFI8 FAQ
1.How can I place an order for 7140LA25PFI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA25PFI8 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 7140LA25PFI8 reliable?
The price and inventory of 7140LA25PFI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA25PFI8 is usually 5 days.
3.What payment methods are accepted for 7140LA25PFI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA25PFI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA25PFI8?
7140LA25PFI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA25PFI8 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 7140LA25PFI8?
For technical support, including 7140LA25PFI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA25PFI8 requirements.
6.How does Aetrix verify that 7140LA25PFI8 is sourced from the original manufacturer or authorized distributors?
All 7140LA25PFI8 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 7140LA25PFI8 meets industry standards.
7.What is the process for return or replacement of 7140LA25PFI8?
All 7140LA25PFI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA25PFI8, 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 7140LA25PFI8 part is unused and in its original packaging.
Return procedure for 7140LA25PFI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA25PFI8 Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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