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Renesas 7140LA35PDG
- Part No.:
- 7140LA35PDG
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7140LA35PDG.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 48DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,707
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Product details
Overview
7140LA35PDG 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 35 ns max read cycle time, 1 mA typical standby current (LA version), and 2 V data retention capability. It enables error-free 16-bit-or-wider memory systems without external logic in industrial embedded controllers and real-time DSP interfaces.
For engineers reviewing the 7140LA35PDG datasheet, 7140LA35PDG pinout, 7140LA35PDG application, or 7140LA35PDG equivalent, this page delivers verified timing parameters, BUSY input behavior, dual-port arbitration constraints, and direct replacement guidance for MIL-PRF-38535-compliant industrial designs requiring battery-backed SRAM with deterministic port-to-port contention resolution.
Technical Context
The 7140LA35PDG 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 logic responds only to address match events from the MASTER, with tAPS = 5 ns priority setup time ensuring deterministic port conflict resolution.
It supports independent TTL-compatible control per port (CEL/CER, OEL/OER, R/WL/R/WR), full asynchronous operation, and battery backup mode at 2 V (VDR), where ICCDR ≤ 4000 µA over –40°C to +85°C. The PDG48 package is a 48-pin plastic DIP with dual-row through-hole mounting and defined mechanical dimensions (0.55″ × 0.61″ × 0.19″).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1K × 8 (1024 words × 8 bits), dual independent ports |
| Max Read Cycle Time | 35 ns - defines minimum clock period for synchronous interface or maximum burst rate in asynchronous systems |
| Standby Current (ISB3) | 0.2 mA typ. - enables ultra-low-power hold mode with CMOS-level CE inputs |
| Data Retention Voltage | 2.0 V - allows backup from coin cell or supercapacitor during main power loss |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL logic rails and noise margins |
| Bus Contention Resolution | BUSY input assertion blocks write cycles - eliminates need for external arbitration logic in MASTER/SLAVE pairs |
Pinout & Package
7140LA35PDG is housed in a 48-pin plastic DIP (PDG48) package with 0.600″ row spacing, through-hole mounting, and JEDEC-standard footprint. Pin 1 is index-marked; all VCC (pins 24, 48) and GND (pins 25, 1) must be decoupled locally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 25) | Ground reference | Common return for both ports; requires low-inductance connection to system ground plane |
| VCC (24, 48) | Power supply | 5 V ±10% supply for core and I/O; each pin must be bypassed with ≥0.1 µF ceramic capacitor |
| CEL / CER | Chip enable (left/right) | Active-low enables port access; controls ISB1/ISB2 standby current states |
| OEL / OER | Output enable (left/right) | Active-low enables I/O drivers; high-Z state reduces bus loading during shared-memory transfers |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of data flow on bidirectional I/O lines |
| BUSYL / BUSYR | BUSY input (left/right) | Active-low signal from MASTER IDT7130; inhibits writes when asserted - no internal pull-up required |
| INTL / INTR | Interrupt flag (left/right) | Open-drain output indicating port-to-port communication event; requires external pull-up resistor |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address bus per port; supports full 1K address space independently |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data bus per port; electrically isolated between ports |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration via BUSY input | Eliminates external logic by using MASTER-driven BUSY signals to block conflicting writes - ensures deterministic memory coherency |
| 2 V data retention (LA version) | Enables seamless transition to battery backup mode without data loss during AC power interruption |
| Industrial temperature range | Validated operation from –40°C to +85°C supports deployment in motor drives, PLCs, and outdoor telecom equipment |
| Low standby power (1 mA typ.) | Reduces system-level power budget in always-on monitoring nodes and edge sensor gateways |
| TTL-compatible 5 V interface | Direct connection to legacy microcontrollers, FPGAs, and DSPs without level-shifting circuitry |
Applications
| Real-Time Digital Signal Processing | Industrial Programmable Logic Controller (PLC) |
|---|---|
|
Use Scenario: Simultaneous data acquisition and algorithm execution in dual-CPU DSP systems. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM buffers sensor data written by one CPU while feeding processed results to the second CPU - synchronized via BUSY-controlled arbitration. Use Value: 35 ns access time enables sub-microsecond inter-processor handshaking; 2 V retention preserves critical state during brownout events. |
Use Scenario: Deterministic I/O mapping and ladder logic execution in modular PLC backplanes. IC Role / Device Role / Timing Role: Memory resource shared between control CPU and fieldbus interface ASIC, with BUSY signaling preventing register corruption during concurrent access. Use Value: Industrial temp rating ensures reliability in cabinet-mounted controllers; 1 mA standby extends uptime in battery-buffered configurations. |
| Military Avionics Data Buffering | Medical Imaging Frame Store |
|
Use Scenario: High-integrity data buffering between flight computer and sensor fusion module in MIL-STD-810G environments. IC Role / Device Role / Timing Role: SLAVE device in MASTER/SLAVE pair with IDT7130, providing fault-tolerant memory expansion compliant with MIL-PRF-38535 QML Class V. Use Value: 35 ns timing meets real-time avionics latency budgets; PDG48 DIP package supports conformal coating and manual rework. |
Use Scenario: Pixel data staging between image sensor array and FPGA-based reconstruction engine in portable ultrasound systems. IC Role / Device Role / Timing Role: Dual-port buffer enabling concurrent capture (left port) and processing (right port) without FIFO latency or frame tearing. Use Value: Asynchronous operation eliminates clock domain crossing; 2 V retention safeguards patient data during emergency power switchover. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1352V-35AC | 3.3 V core supply, 35 ns access, 1K × 16 organization - no native 1K × 8 variant | Requires level translation for 5 V systems; wider data bus increases PCB routing complexity | Choose only if migrating to 3.3 V architecture and needing 16-bit word width |
| IDT7130LA35PDG | MASTER device with on-chip arbitration logic and open-drain BUSY outputs - not pin-compatible | Cannot replace SLAVE function; used only as companion in MASTER/SLAVE pairs | Select only when building new 16-bit+ memory systems requiring integrated arbitration |
Compared with CY7C1352V-35AC and IDT7130LA35PDG, the 7140LA35PDG uniquely provides 5 V TTL compatibility, true SLAVE-only BUSY input behavior, and industrial-grade 2 V data retention - making it irreplaceable in legacy 5 V dual-CPU systems requiring guaranteed write inhibition under contention.
Availability
7140LA35PDG is available at Aetrix Electronics and suitable for industrial programmable logic controllers, real-time DSP subsystems, and military avionics data buffers requiring stable component supply across extended product lifecycles.
Supply support for 7140LA35PDG 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 deterministic, contention-free memory sharing between heterogeneous processors - designed specifically for real-time control, signal processing, and safety-critical embedded systems.
FAQ
What is the role of BUSYL and BUSYR on the 7140LA35PDG?
The BUSYL and BUSYR pins on the 7140LA35PDG are active-low inputs - not outputs - that, when driven low by a MASTER IDT7130, internally inhibit write operations on the respective port. This prevents data corruption during address contention and eliminates the need for external arbitration logic. Unlike the MASTER device, the 7140LA35PDG does not drive BUSY signals; it only responds to them.
Does the 7140LA35PDG support battery backup operation?
Yes, the 7140LA35PDG supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), consuming ≤4000 µA at –40°C to +85°C. This feature is exclusive to LA versions and enables nonvolatile memory hold during main power failure - critical for industrial control state preservation and avionics black-box logging.
Can the 7140LA35PDG operate as a standalone dual-port RAM?
No, the 7140LA35PDG is explicitly designed as a SLAVE device and lacks on-chip arbitration logic. It requires pairing with a MASTER IDT7130 to resolve port conflicts. Attempting standalone use results in undefined behavior during simultaneous access - the BUSY inputs remain unasserted, allowing potential data corruption.
What is the meaning of "PDG" in the 7140LA35PDG part number?
"PDG" denotes the 48-pin plastic dual in-line package (PDIP) variant of the 7140LA35PDG, with mechanical dimensions of 0.55″ × 0.61″ × 0.19″. It is distinct from FP48 (flatpack), LC48 (LCC), PLG52 (PLCC), and PPG64/PNG64 (TQFP/STQFP) variants - all sharing identical electrical specifications but differing in mounting method and thermal profile.
How does the 7140LA35PDG differ from the 7140SA35PDG?
The 7140LA35PDG features 1 mA typical standby current (ISB3) and 2 V data retention, whereas the 7140SA35PDG draws 5 mA typical standby current and lacks battery backup capability. Both share identical 35 ns timing, pinout, and functional behavior - the LA suffix indicates low-power, retention-optimized silicon process targeting industrial and military applications with extended power-loss resilience.
7140LA35PDG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-DIP (0.600", 15.24mm)
- 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:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 48-PDIP
7140LA35PDG FAQ
1.How can I place an order for 7140LA35PDG through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA35PDG 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 7140LA35PDG reliable?
The price and inventory of 7140LA35PDG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA35PDG is usually 5 days.
3.What payment methods are accepted for 7140LA35PDG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA35PDG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA35PDG?
7140LA35PDG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA35PDG 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 7140LA35PDG?
For technical support, including 7140LA35PDG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA35PDG requirements.
6.How does Aetrix verify that 7140LA35PDG is sourced from the original manufacturer or authorized distributors?
All 7140LA35PDG 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 7140LA35PDG meets industry standards.
7.What is the process for return or replacement of 7140LA35PDG?
All 7140LA35PDG units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA35PDG, 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 7140LA35PDG part is unused and in its original packaging.
Return procedure for 7140LA35PDG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA35PDG Tags
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