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Renesas 7140LA35PF
- Part No.:
- 7140LA35PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7140LA35PF.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,150
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Product details
Overview
7140LA35PF 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 35ns max read cycle time, 1mW standby power, and 2V battery-backed data retention. It enables error-free 16-bit-or-wider memory systems without external arbitration logic in industrial control and real-time signal processing.
For engineers reviewing the 7140LA35PF datasheet, 7140LA35PF pinout, 7140LA35PF application, or 7140LA35PF equivalent, this page delivers verified timing parameters (tRC = 35ns, tAA = 35ns), BUSY input behavior, dual-port arbitration constraints, and package-specific I/O capacitance (CIN = 9pF, COUT = 10pF) critical for deterministic multi-processor memory coherency design.
Technical Context
The 7140LA35PF operates as a SLAVE in MASTER/SLAVE configurations with IDT7130, accepting BUSY input signals (BUSYL/BUSYR) to inhibit writes during address contention-no on-chip arbitration logic. Its dual independent ports support simultaneous read/write operations with TTL-compatible 5V ±10% supply and CMOS-level standby control.
It implements battery backup via VCC = 2.0V data retention mode (ICCDR ≤ 4000µA at MIL/IND temp), requires external pull-up resistors on open-drain INTL/INTR outputs, and uses separate CE/OE/R/W controls per port to enable full asynchronous operation without inter-port synchronization overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit data bus per port) |
| Access Time (tRC) | 35ns max - defines minimum read cycle interval for reliable data capture |
| Standby Current (ISB3) | 0.2mA typ. - ultra-low power consumption when both ports disabled with CMOS-level CE |
| Data Retention Voltage | 2.0V min - enables non-volatile hold using backup battery without system power |
| I/O Capacitance | CIN = 9pF, COUT = 10pF - determines trace length limits and termination requirements for 35ns timing |
| Operating Temp Range | –40°C to +85°C - qualified for industrial environments without derating |
| Supply Voltage | 4.5V to 5.5V - compatible with standard 5V TTL logic families and legacy industrial rails |
Pinout & Package
7140LA35PF is supplied in a 48-pin ceramic flatpack (FP48) package measuring approximately 0.75″ × 0.75″ × 0.11″, with 24 pins per side and pin 1 marked by a notch or dot. All VCC pins require local decoupling; all GND pins must be connected to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A9L | Left port address inputs | 10-bit address bus selecting one of 1024 memory locations for left-side access |
| A0R–A9R | Right port address inputs | Independent 10-bit address bus for concurrent right-side memory access |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; direction controlled by R/WL and OEL; high-impedance when disabled |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; direction controlled by R/WR and OER; isolated from left port I/O |
| CEL, CER | Chip enable (active low) | Port activation control; ISB1/ISB2 current states depend on CE assertion per port |
| OEL, OER | Output enable (active low) | Enables data drivers only; does not affect internal memory access or power state |
| R/WL, R/WR | Read/write control (active low = write) | Determines data flow direction on respective I/O bus; no effect on opposite port |
| BUSYL, BUSYR | Busy input (SLAVE mode) | Active-low signals from IDT7130 MASTER that block writes to corresponding port during contention |
| INTL, INTR | Interrupt flag outputs (open drain) | Require external pull-up; indicate port-to-port communication events (e.g., address 3FE/3FF writes) |
| VCC, GND | Power and ground | Multiple VCC/GND pins distributed across package for low-noise, low-inductance supply routing |
Key Features
| Feature | Design Value |
|---|---|
| Fully asynchronous dual-port operation | Enables independent, unsynchronized reads/writes on left and right ports without clock or handshake coordination |
| SLAVE-only BUSY input interface | Eliminates need for external arbitration logic when paired with IDT7130 MASTER in 16-bit+ systems |
| 2V battery-backed data retention | Maintains stored data during main power loss-critical for industrial black-box logging and fault recovery |
| TTL-compatible 5V supply | Direct interfacing with legacy microcontrollers, FPGAs, and ASICs without level-shifting circuitry |
| Industrial temperature qualification | Guaranteed operation from –40°C to +85°C with no derating-suitable for uncontrolled cabinet environments |
| Low-power standby (1mW typ.) | Reduces thermal load and extends battery life in always-on embedded monitoring applications |
Applications
| Real-Time Digital Signal Processing | Industrial PLC Memory Expansion |
|---|---|
|
Use Scenario: Dual-CPU DSP system where one processor handles ADC sampling while another runs FFT algorithms on captured data. IC Role / Device Role / Timing Role: SLAVE 7140LA35PF provides shared memory buffer between processors; BUSY input prevents write collisions during simultaneous access to same address. Use Value: Enables deterministic 35ns-latency data exchange without software locks or polling-reducing jitter in closed-loop control loops. |
Use Scenario: Modular PLC backplane with separate I/O and logic modules requiring synchronized memory access across multiple slots. IC Role / Device Role / Timing Role: Acts as expandable 1K×8 memory node in MASTER/SLAVE configuration with IDT7130, doubling effective data bus width to 16 bits. Use Value: Eliminates discrete glue logic for bus arbitration-reducing BOM count and PCB area in space-constrained DIN-rail mounted controllers. |
| Avionics Data Logger | Medical Imaging Frame Buffer |
|
Use Scenario: Crash-protected flight recorder capturing sensor telemetry during power interruption. IC Role / Device Role / Timing Role: 7140LA35PF retains last 1KB of critical flight data when main 5V rail drops to 2V battery backup. Use Value: Meets DO-160 Section 22 surge/loss-of-power requirements with guaranteed 2V data hold-no capacitor-based hold-up needed. |
Use Scenario: Ultrasound machine acquiring real-time B-mode image frames at 30Hz, requiring low-latency frame buffering. IC Role / Device Role / Timing Role: Left port accepts digitized RF samples from ADC; right port streams processed pixels to display controller-both operating concurrently. Use Value: 35ns access time ensures zero-frame-drop operation at full resolution; 1mW standby cuts thermal noise in analog front-end proximity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C133-35PC | 35ns access, 1K×8, but lacks battery backup and BUSY arbitration interface; uses single CE for both ports | Suitable for simpler dual-CPU systems without contention detection needs | Select when cost sensitivity outweighs need for hardware arbitration or data retention |
| IDT7130LA35PF | Same family, MASTER device with on-chip arbitration logic and BUSY output (not input); pinout differs in BUSY/INT function assignment | Required as MASTER in any 7140LA35PF-based expansion system; cannot substitute directly | Use only as companion MASTER-never as drop-in replacement for SLAVE 7140LA35PF |
Compared with CY7C133-35PC, 7140LA35PF adds hardware-enforced write blocking via BUSY input and 2V data retention-critical for safety-critical industrial logging. Versus IDT7130LA35PF, it omits arbitration logic but gains dedicated SLAVE pin mapping, enabling scalable memory width expansion without redesign.
Availability
7140LA35PF is available at Aetrix Electronics and suitable for industrial automation, avionics data recording, and medical imaging systems requiring stable component supply, long-term lifecycle support, and MIL-PRF-38535-compliant manufacturing traceability.
Supply support for 7140LA35PF 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, and RF solutions, now part of Renesas Electronics since 2019.
The IDT7130/7140 family was designed specifically for deterministic dual-processor memory sharing in real-time embedded systems-emphasizing hardware arbitration, low-latency access, and industrial reliability over general-purpose SRAM features.
FAQ
What is the role of BUSYL and BUSYR on the 7140LA35PF?
On the 7140LA35PF, BUSYL and BUSYR are dedicated input pins-not outputs-that accept active-low BUSY signals from an IDT7130 MASTER device. When asserted, they internally inhibit write operations to the corresponding port during address contention, eliminating the need for external arbitration logic. This behavior is fixed for SLAVE operation and cannot be reconfigured.
Does the 7140LA35PF support true simultaneous read/write between ports?
Yes, the 7140LA35PF supports fully asynchronous operation: the left port can read while the right port writes (or vice versa) to different addresses without timing conflict. However, if both ports access the same memory location concurrently, the BUSY input mechanism-driven by the MASTER IDT7130-ensures deterministic resolution by blocking the later-arriving write, preserving data integrity.
Can the 7140LA35PF operate without an IDT7130 MASTER device?
Yes-the 7140LA35PF functions as a standalone 1K×8 dual-port SRAM without a MASTER. In that mode, BUSYL and BUSYR must be held HIGH (via pull-up resistors) to enable normal write operations. The device loses hardware arbitration capability but retains full dual-port read/write functionality and battery backup.
What is the significance of the 'PF' suffix in 7140LA35PF?
The 'PF' suffix denotes the 48-pin ceramic flatpack (FP48) package variant of the 7140LA35PF. It specifies mechanical form factor, thermal characteristics (0.11″ height), and lead finish (typically tin-lead), distinguishing it from other packages like PDG48 (plastic DIP) or PPG64 (STQFP). Pinout and electrical specs remain identical across package variants.
How does the 2V data retention mode work on the 7140LA35PF?
In data retention mode, the 7140LA35PF maintains stored memory contents when VCC drops to 2.0V (minimum), drawing ≤4000µA at industrial temperature. CE pins must be held HIGH to enter full standby; no clocks or external signals are required. This mode is not intended for active operation-only for preserving data during main power loss until recovery.
7140LA35PF 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:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
7140LA35PF FAQ
1.How can I place an order for 7140LA35PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA35PF 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 7140LA35PF reliable?
The price and inventory of 7140LA35PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA35PF is usually 5 days.
3.What payment methods are accepted for 7140LA35PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA35PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA35PF?
7140LA35PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA35PF 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 7140LA35PF?
For technical support, including 7140LA35PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA35PF requirements.
6.How does Aetrix verify that 7140LA35PF is sourced from the original manufacturer or authorized distributors?
All 7140LA35PF 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 7140LA35PF meets industry standards.
7.What is the process for return or replacement of 7140LA35PF?
All 7140LA35PF units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA35PF, 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 7140LA35PF part is unused and in its original packaging.
Return procedure for 7140LA35PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA35PF Tags
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