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Renesas 7140LA35PF8
- Part No.:
- 7140LA35PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7140LA35PF8.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,519
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Product details
Overview
7140LA35PF8 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 35 ns maximum read cycle time, 1 µA typical full-standby current (CMOS-level CE), and battery-backed data retention at 2 V. It is used in real-time embedded controllers requiring concurrent CPU and DMA access to shared memory buffers.
For engineers reviewing the 7140LA35PF8 datasheet, 7140LA35PF8 pinout, 7140LA35PF8 application, or 7140LA35PF8 equivalent, this page delivers verified electrical specs, BUSY-integrated arbitration timing, industrial temperature support (–40°C to +85°C), and direct substitution guidance for legacy dual-port SRAM designs.
Technical Context
The 7140LA35PF8 operates as a SLAVE unit paired with IDT7130 MASTER devices, accepting BUSY input signals (BUSYL/BUSYR) to inhibit writes during address contention-no on-chip arbitration logic resides in the 7140LA. Its dual independent ports enable simultaneous read/write operations across separate address/data/control buses without external glue logic.
It supports TTL-compatible 5 V ±10% supply, features open-drain INTL/INTR flags for inter-port interrupt signaling, and implements automatic power-down via CE-controlled standby modes-including ultra-low ISB3 = 0.2 mA (typ.) under CMOS-level disable conditions. Data retention at 2 V is exclusive to LA-grade variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), enabling compact shared-memory buffers for dual-processor or CPU/DMA architectures. |
| Access Time | 35 ns max read cycle time (tRC), ensuring deterministic latency for real-time control loops operating up to ~28.5 MHz. |
| Supply Voltage | 5.0 V ±10% (4.5–5.5 V), compatible with standard TTL/CMOS logic families without level-shifting. |
| Standby Current | 0.2 mA typical (ISB3, CMOS-level CE), reducing system power in sleep states while preserving data integrity. |
| Data Retention | 2.0 V minimum VCC for data retention (LA-only), supporting backup battery operation during main power loss. |
| Operating Temp | –40°C to +85°C industrial range, validated for deployment in motor drives, industrial PLCs, and telecom line cards. |
| I/O Interface | Two independent TTL-compatible ports (left/right), each with dedicated A0–A9, I/O0–I/O7, R/W, CE, OE, INT, and BUSY terminals. |
Pinout & Package
7140LA35PF8 is supplied in a 48-pin ceramic flatpack (FP48) package measuring approximately 0.75″ × 0.75″ × 0.11″, with through-hole mounting and hermetic sealing suitable for high-reliability industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Common return path for both ports; requires low-impedance connection to system ground plane. |
| VCC (Pin 25) | Power supply | Single 5 V supply powering all internal logic and I/O drivers; must be decoupled locally with 0.1 µF ceramic capacitor. |
| CEL / CER | Chip enable (left/right) | Active-low enables port access; controls dynamic current draw and initiates power-down when deasserted. |
| OEL / OER | Output enable (left/right) | Active-low enables I/O pins as outputs during reads; high-Z state prevents bus contention during writes. |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of data flow on I/O0–I/O7 lines for respective port. |
| BUSYL / BUSYR | BUSY input (left/right) | Active-low inputs from IDT7130 MASTER that block writes during address contention-no internal pull-up required. |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs signaling inter-port events (e.g., flag set/clear); require external pull-up resistors. |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses selecting one of 1024 memory locations per port; latched on CE/R/W transitions. |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data paths; driven during writes, tri-stated during reads unless OE asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only arbitration interface | Accepts BUSY inputs instead of generating them-enables clean hierarchical memory expansion with IDT7130 MASTER without external arbitration logic. |
| Ultra-low standby power | 0.2 mA typical ISB3 current at CMOS-level CE disable allows >10-year battery life in 2 V retention mode for critical data logging. |
| Asynchronous dual-port operation | Independent left/right control allows concurrent CPU and DSP access to shared buffer memory without clock domain synchronization. |
| Industrial temperature grade | Qualified from –40°C to +85°C with full AC/DC specs guaranteed, eliminating derating concerns in harsh ambient environments. |
| TTL-compatible I/O | Direct interfacing with legacy microcontrollers (e.g., 80C51, 68HC11) and FPGAs without level translators or bus buffers. |
Applications
| Motor Control System | Digital Signal Processing |
|---|---|
Use Scenario: Real-time coordination between motion controller CPU and servo drive FPGA using shared parameter tables and status registers. IC Role / Device Role / Timing Role: 7140LA35PF8 serves as SLAVE dual-port RAM holding PID coefficients and encoder feedback buffers, accessed concurrently by CPU (left port) and FPGA (right port). Use Value: Eliminates handshake overhead and guarantees atomic read-modify-write cycles for critical motion parameters, improving jitter performance by >3× vs. single-port SRAM + semaphore logic. | Use Scenario: Audio codec interfacing where DSP writes processed samples while host processor reads diagnostics and configures filters. IC Role / Device Role / Timing Role: 7140LA35PF8 provides non-blocking memory space for ping-pong sample buffering, with left port for DSP writes and right port for ARM host reads. Use Value: Enables zero-wait-state streaming at 48 kHz sampling rate using 35 ns access time-no FIFO depth tuning or DMA descriptor management required. |
| Industrial PLC I/O Module | Avionics Data Acquisition |
Use Scenario: High-speed digital I/O scanning where fieldbus controller updates I/O image while safety monitor validates consistency. IC Role / Device Role / Timing Role: 7140LA35PF8 stores mirrored I/O image; left port updated by EtherCAT master, right port scanned by ASIL-B safety checker. Use Value: Hardware-enforced BUSY arbitration prevents corrupted reads during concurrent writes, satisfying IEC 61508 SIL2 data coherency requirements without software locks. | Use Scenario: Flight data recorder subsystem capturing sensor telemetry from multiple ADCs while flight computer logs metadata. IC Role / Device Role / Timing Role: 7140LA35PF8 acts as fault-tolerant buffer-left port receives time-stamped analog samples, right port streams compressed blocks to non-volatile storage. Use Value: 2 V data retention ensures crash-record integrity even after main power failure, meeting DO-160 Section 22 lightning-induced transient survivability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C131-35PC | 35 ns access, 5 V, 1K × 8, but lacks BUSY arbitration inputs and uses separate BYTE controls instead of full 8-bit I/O. | Requires external logic for contention resolution; not drop-in for MASTER/SLAVE topologies. | Select only if redesigning arbitration into FPGA or CPLD and prioritizing Cypress's longer production lifecycle. |
| IS61LV25616AL-10TLI | 10 ns access, 3.3 V supply, 256K × 16 organization-higher density but incompatible voltage and pinout. | Not usable in 5 V legacy systems; demands level shifters and PCB rework for 16-bit bus width. | Consider for new 3.3 V designs needing larger memory footprint; not suitable for 7140LA35PF8 replacement without architecture change. |
Compared with CY7C131-35PC and IS61LV25616AL-10TLI, the 7140LA35PF8 uniquely delivers hardware BUSY-based arbitration, 5 V compatibility, and true SLAVE behavior-making it irreplaceable in existing IDT7130/7140-based systems without functional or layout modification.
Availability
7140LA35PF8 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC modules, avionics data recorders, and digital signal processing subsystems requiring stable component supply across extended product lifecycles.
Supply support for 7140LA35PF8 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, acquired by Renesas Electronics in 2019.
The IDT7140 family was engineered for deterministic dual-processor memory sharing in aerospace, industrial automation, and telecom infrastructure-emphasizing hardware arbitration, low-power retention, and MIL-qualified reliability.
FAQ
What is the role of BUSYL and BUSYR on the 7140LA35PF8?
On the 7140LA35PF8, BUSYL and BUSYR are active-low input signals-not outputs-that receive arbitration status from an IDT7130 MASTER device. When asserted, they internally inhibit write operations to the corresponding port, preventing data corruption during address contention. Unlike the MASTER, the 7140LA35PF8 contains no arbitration logic and does not drive BUSY signals.
Does the 7140LA35PF8 support battery backup operation?
Yes, the 7140LA35PF8 supports battery backup data retention at 2.0 V minimum supply voltage-a feature exclusive to LA-grade variants. In retention mode, it draws ≤4000 µA (military grade) or ≤1500 µA (commercial grade), preserving memory contents indefinitely during main power loss without external circuitry.
Can the 7140LA35PF8 operate as a standalone dual-port RAM?
No-the 7140LA35PF8 is designed exclusively as a SLAVE device and requires pairing with an IDT7130 MASTER for full functionality. It lacks on-chip arbitration logic and BUSY output capability; standalone use would result in unmanaged write contention and potential data corruption during simultaneous port access.
What is the meaning of "PF8" in the part number 7140LA35PF8?
The "PF8" suffix in 7140LA35PF8 denotes a 48-pin ceramic flatpack (FP48) package with military-grade screening (Class B or QML-38535 compliant), rated for operation from –55°C to +125°C and featuring hermetic sealing. The "35" indicates 35 ns maximum access time, and "LA" specifies low-power, battery-retentive variant.
How does the 7140LA35PF8 handle interrupt signaling between ports?
The 7140LA35PF8 uses open-drain INTL and INTR pins to generate inter-port interrupts. Writing to address 3FFH on one port sets the opposite port's interrupt flag (e.g., left-port write to 3FFH asserts INTR), while writing to 3FEH clears it. External pull-up resistors are required, and timing is specified with tINS ≤25 ns (max) for interrupt set operations.
7140LA35PF8 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:
- 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)
7140LA35PF8 FAQ
1.How can I place an order for 7140LA35PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA35PF8 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 7140LA35PF8 reliable?
The price and inventory of 7140LA35PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA35PF8 is usually 5 days.
3.What payment methods are accepted for 7140LA35PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA35PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA35PF8?
7140LA35PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA35PF8 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 7140LA35PF8?
For technical support, including 7140LA35PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA35PF8 requirements.
6.How does Aetrix verify that 7140LA35PF8 is sourced from the original manufacturer or authorized distributors?
All 7140LA35PF8 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 7140LA35PF8 meets industry standards.
7.What is the process for return or replacement of 7140LA35PF8?
All 7140LA35PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA35PF8, 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 7140LA35PF8 part is unused and in its original packaging.
Return procedure for 7140LA35PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA35PF8 Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24CS02-SSHM-T
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AT24C04C-SSHM-T
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