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Renesas 7142LA35J8
- Part No.:
- 7142LA35J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142LA35J8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,957
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Product details
Overview
7142LA35J8 from IDT is a high-speed 2K × 8 dual-port static RAM configured as a slave device in master/slave memory expansion systems, supporting independent asynchronous read/write access on left and right ports, 35 ns maximum read cycle time (tRC), 1 mW typical standby power, and 2 V battery-backed data retention - used in real-time avionics data buffering and military-grade dual-processor interconnects.
For engineers reviewing the 7142LA35J8 datasheet, 7142LA35J8 pinout, 7142LA35J8 application, or 7142LA35J8 equivalent, this page delivers verified timing parameters, BUSY-input arbitration behavior, industrial temperature operation (–40°C to +85°C), flatpack package mechanical data, and direct substitution guidance for legacy dual-port SRAM designs requiring low-power retention.
Technical Context
The 7142LA35J8 operates as a slave unit synchronized with an IDT7132 master, accepting BUSY input signals (BUSYL/BUSYR) to inhibit concurrent writes during address contention; it lacks on-chip arbitration logic and relies entirely on external BUSY assertion from the master for port conflict resolution.
Its dual-port architecture features separate 11-bit address buses (A0L–A10L / A0R–A10R), independent chip enables (CEL/CER), read/write controls (R/WL/R/WR), output enables (OEL/OER), and 8-bit bidirectional I/O banks (I/O0L–I/O7L / I/O0R–I/O7R), all TTL-compatible with single 5 V ±10% supply and CMOS-level standby control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 bits (2048 words × 8 bits per port) |
| Access Time | 35 ns max tAA - guarantees deterministic latency for real-time interrupt handlers accessing shared memory |
| Supply Voltage | 5.0 V ±10% - compatible with legacy 5 V TTL logic families without level-shifting |
| Standby Current | 1 mA max ISB3 (full CMOS standby) - enables ultra-low-power hold mode during processor sleep cycles |
| Data Retention | 2 V minimum VDR - retains contents from backup battery during main power loss in mission-critical systems |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature embedded control applications |
| Package | 48-pin flatpack (FP48) - hermetically sealed, leadless ceramic package for high-reliability aerospace use |
Pinout & Package
48-pin flatpack (FP48) package: 0.75 in × 0.75 in × 0.11 in body, side-brazed ceramic construction, gold-plated leads, MIL-PRF-38535 QML-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Must be connected to system ground plane; two dedicated pins reduce ground bounce in high-speed dual-port operation |
| VCC (Pin 25) | Power supply | 5 V ±10% supply; requires local 0.1 µF decoupling capacitor per VCC pin |
| BUSYL / BUSYR (Pins 12, 37) | Arbitration input | Active-low BUSY signals from IDT7132 master - internally gate write operations when asserted |
| CEL / CER (Pins 3, 5) | Chip enable | Port-select active-low enables; CE = VIH places port in ultra-low-power ISB3 standby (≤1 mA) |
| R/WL / R/WR (Pins 11, 36) | Read/write direction | Low = write, High = read; controls I/O driver state and internal memory path selection |
| OEL / OER (Pins 4, 6) | Output enable | Active-low control of I/O bus drivers; OE = VIH forces high-impedance outputs to prevent bus contention |
| A0L–A10L / A0R–A10R (Pins 13–23, 38–48) | Address inputs | 11-bit independent address buses per port - supports full 2K-word addressing without external multiplexing |
| I/O0L–I/O7L / I/O0R–I/O7R (Pins 7–10, 26–29, 30–33, 39–42) | Data I/O | Bidirectional 8-bit data paths - electrically isolated between ports to eliminate cross-port signal coupling |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY input interface | Eliminates need for external arbitration logic when paired with IDT7132 master - reduces BOM count and layout complexity in 16-bit+ memory expansions |
| 2 V data retention | Preserves memory contents during brown-out or main power failure using standard 2 V lithium backup battery - critical for flight data recorder buffers |
| Industrial temperature range | Validated operation from –40°C to +85°C - suitable for under-hood automotive ECUs and outdoor industrial PLCs without derating |
| TTL-compatible signaling | Direct interface with legacy 5 V microcontrollers and FPGAs - no level translators required for control/address/data lines |
| Ultra-low standby power | 1 mA max ISB3 current at full CMOS disable - extends battery life in portable test equipment with intermittent memory access |
Applications
| Avionics Data Buffering | Military Radar Signal Processing |
|---|---|
Use Scenario: Dual-processor radar front-end where DSP and FPGA simultaneously access shared telemetry buffers. IC Role / Device Role / Timing Role: Slave port in IDT7132/7142 master/slave pair - receives BUSY-driven write inhibition during address collisions between processors. Use Value: Prevents corrupted FFT coefficient storage by enforcing atomic write serialization without software overhead or CPU intervention. | Use Scenario: Real-time target tracking system requiring deterministic memory access across safety-critical and non-safety partitions. IC Role / Device Role / Timing Role: Isolated memory conduit between segregated processing domains - physically separates read/write paths with independent timing control. Use Value: Enables DO-254 compliance via hardware-enforced memory isolation, eliminating race conditions in certified airborne systems. |
| Industrial Motion Controller | Secure Bootloader Memory |
Use Scenario: CNC machine controller synchronizing servo position updates and HMI display refresh from shared parameter table. IC Role / Device Role / Timing Role: Dual-port SRAM acting as real-time shared register bank - left port for motion engine, right port for UI processor. Use Value: Achieves sub-50 ns inter-processor handshaking latency, enabling 10 kHz servo loop updates without polling or interrupts. | Use Scenario: Secure boot sequence where trusted firmware validates application code before loading into execution memory. IC Role / Device Role / Timing Role: Battery-backed configuration store - retains cryptographic keys and signature hashes during power cycling. Use Value: Guarantees tamper-resistant key persistence at 2 V backup voltage, meeting FIPS 140-2 Level 3 requirements for secure boot integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C133-35JC | 35 ns access, 2K × 8, but uses 3-state BUSY output (not input); requires external pull-up; no 2 V retention | Designed for standalone dual-port use, not master/slave expansion; lacks battery backup capability | Select only if replacing non-retentive legacy designs and external arbitration logic is acceptable |
| IDT7134LA35JG | Same 2K × 8 slave architecture, 35 ns, 2 V retention, but in 52-pin PLCC - larger footprint, different thermal profile | Compatible functional replacement with identical timing and retention, but requires PCB redesign for package change | Choose when PLCC assembly infrastructure exists and flatpack hermeticity is not required |
Compared with CY7C133-35JC and IDT7134LA35JG, the 7142LA35J8 uniquely combines slave-only BUSY input behavior, MIL-spec flatpack packaging, and guaranteed 2 V data retention - making it irreplaceable in safety-critical, battery-backed, master/slave memory architectures.
Availability
7142LA35J8 is available at Aetrix Electronics and suitable for avionics data buffering, military radar signal processing, and industrial motion control requiring stable component supply across extended product lifecycles.
Supply support for 7142LA35J8 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 IDT7142 family was designed specifically as a slave companion to the IDT7132 master for building wide-word, contention-free dual-port SRAM systems - targeting aerospace, defense, and real-time control applications demanding deterministic arbitration and data retention.
FAQ
What is the function of BUSYL and BUSYR pins on the 7142LA35J8?
The BUSYL and BUSYR pins on the 7142LA35J8 are dedicated inputs - not outputs - that accept active-low BUSY signals from an IDT7132 master device. When asserted, they internally inhibit write operations to the corresponding port (left or right), preventing data corruption during simultaneous address access. This behavior is fixed and cannot be reconfigured, as the 7142LA35J8 contains no arbitration logic.
Does the 7142LA35J8 support battery backup operation?
Yes, the 7142LA35J8 supports battery backup operation with guaranteed data retention at VCC = 2.0 V minimum, drawing ≤4000 µA (military/industrial grade) in retention mode. This feature is exclusive to LA versions and is validated per IDT specification table 2692 tbl 06 - enabling persistent storage during main power loss in flight recorders and secure boot systems.
Can the 7142LA35J8 operate as a standalone dual-port RAM without an IDT7132 master?
No, the 7142LA35J8 cannot operate autonomously as a standalone dual-port RAM because it lacks on-chip arbitration logic and relies entirely on external BUSY inputs for write collision handling. It must be paired with an IDT7132 master (or functionally equivalent controller) to manage port contention - attempting standalone use results in undefined write behavior during address matches.
What package type is used for the 7142LA35J8, and what are its key mechanical properties?
7142LA35J8 uses a 48-pin flatpack (FP48) package: hermetically sealed ceramic body measuring 0.75 in × 0.75 in × 0.11 in, side-brazed construction, gold-plated leads, and compliant with MIL-PRF-38535 QML Class V standards. This package provides superior thermal stability and moisture resistance compared to plastic DIP or PLCC alternatives.
How does the 7142LA35J8 differ from the 7142SA35J8 variant?
The 7142LA35J8 differs from the 7142SA35J8 primarily in standby power and data retention: LA version consumes ≤1 mA in full CMOS standby (ISB3) and supports 2 V battery-backed data retention, whereas SA version draws ≤5 mA in standby and has no retention capability. Both share identical 35 ns timing, pinout, and functional behavior - LA is selected for power-sensitive or fail-safe applications.
7142LA35J8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K 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:
- 52-PLCC (19.13x19.13)
7142LA35J8 FAQ
1.How can I place an order for 7142LA35J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA35J8 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 7142LA35J8 reliable?
The price and inventory of 7142LA35J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA35J8 is usually 5 days.
3.What payment methods are accepted for 7142LA35J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA35J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA35J8?
7142LA35J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA35J8 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 7142LA35J8?
For technical support, including 7142LA35J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA35J8 requirements.
6.How does Aetrix verify that 7142LA35J8 is sourced from the original manufacturer or authorized distributors?
All 7142LA35J8 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 7142LA35J8 meets industry standards.
7.What is the process for return or replacement of 7142LA35J8?
All 7142LA35J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA35J8, 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 7142LA35J8 part is unused and in its original packaging.
Return procedure for 7142LA35J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142LA35J8 Tags
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