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Renesas 7142LA35J
- Part No.:
- 7142LA35J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142LA35J.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,689
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Product details
Overview
7142LA35J from IDT is a 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 μA full-standby current (ISB3), and 2 V battery-backed data retention - used in real-time avionics bus controllers requiring concurrent CPU and DMA access to shared memory.
For engineers reviewing the 7142LA35J datasheet, 7142LA35J pinout, 7142LA35J application, or 7142LA35J equivalent, this page delivers verified electrical specs, BUSY-input arbitration behavior, flatpack package layout, low-power industrial-temperature operation, and direct alternatives for 16-bit+ memory width scaling.
Technical Context
The 7142LA35J implements a true dual-port SRAM architecture with physically separate address, control, and I/O buses per port - enabling simultaneous access without internal arbitration logic. Its BUSY pin functions exclusively as an input (unlike the master 7132), allowing external write-inhibit gating during address contention.
It supports TTL-compatible 5 V ±10% supply, operates across –40°C to +85°C, and uses CMOS process technology to achieve 1 μA full-standby current (ISB3) at CMOS-level inputs and 200 µW typical battery-retention power at 2 V - critical for nonvolatile memory hold in power-loss scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit data width per port) |
| Max Read Cycle Time (tRC) | 35 ns - defines minimum interval between successive reads on same port |
| Full Standby Current (ISB3) | 1 μA at VCC = 5 V, CMOS-level inputs - enables ultra-low-power sleep mode |
| Data Retention Voltage | 2.0 V - maintains stored data during main power loss; LA variant only |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems |
| Supply Voltage | 4.5 V to 5.5 V - TTL-compatible single 5 V rail with ±10% tolerance |
| Input Leakage Current |ILI| | 5 µA max - ensures stable high-impedance input behavior over temperature |
Pinout & Package
7142LA35J is packaged in a 48-lead flatpack (FP48) with 0.75 in × 0.75 in footprint and 0.11 in height. All VCC and GND pins must be externally connected; BUSYL and BUSYR are dedicated input-only terminals for write-inhibit arbitration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left/Right) | Active-low port selection; controls power-down entry (ISB1–ISB4 states) |
| OEL / OER | Output Enable (Left/Right) | Active-low output driver enable; sets I/O pins to high-Z when deasserted |
| R/WL / R/WR | Read/Write Control (Left/Right) | High = read, Low = write; determines data direction on I/O lines |
| BUSYL / BUSYR | Busy Input (Left/Right) | Active-low write-inhibit signal - gates internal write path when asserted |
| A0L–A10L / A0R–A10R | Address Inputs (Left/Right) | 11-bit address bus per port; selects one of 2048 memory locations |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O Lines (Left/Right) | Bidirectional 8-bit data bus per port; driven by R/W state and OE |
Key Features
| Feature | Design Value |
|---|---|
| Slave-mode BUSY input | Enables hardware write-inhibit without external logic when paired with 7132 master |
| 2 V data retention | Preserves memory contents during main power failure using backup battery |
| 1 μA full-standby current | Reduces system-level standby power in always-on industrial controllers |
| Independent port arbitration | Allows concurrent CPU (left port) and DSP/DMA (right port) access without software coordination |
| Industrial temperature range | Validated operation from –40°C to +85°C - suitable for under-hood or factory-floor deployment |
Applications
| Avionics Data Bus Controller | Digital Signal Processor Memory Interface |
|---|---|
Use Scenario: Concurrent access to shared telemetry buffer by flight computer (left port) and ground-uplink processor (right port) via ARINC 429 interface. IC Role / Device Role / Timing Role: Slave dual-port SRAM providing synchronized read/write isolation with BUSY-driven write stall during address collision. Use Value: Eliminates software semaphore overhead and guarantees deterministic memory coherency in safety-critical timing windows. |
Use Scenario: Real-time FFT processing where DSP core writes sensor samples while DMA engine reads completed transforms. IC Role / Device Role / Timing Role: Low-latency 35 ns dual-port memory acting as ping-pong buffer between compute and I/O subsystems. Use Value: Enables zero-wait-state data handoff, sustaining 28.6 MB/s sustained bandwidth (8 B × 1/35 ns). |
| Industrial PLC I/O Mapping Module | Military Radar Signal Preprocessor |
Use Scenario: Deterministic scan-cycle memory for ladder logic execution, with CPU updating I/O image and fieldbus ASIC reading/writing status registers. IC Role / Device Role / Timing Role: Industrial-temp dual-port SRAM with 2 V retention preserving last-known I/O state during brownout. Use Value: Maintains safe I/O state during power interruption - meeting IEC 61508 SIL-2 fault-tolerance requirements. |
Use Scenario: High-reliability pulse-Doppler radar front-end buffering raw ADC samples before FPGA-based beamforming. IC Role / Device Role / Timing Role: MIL-qualified slave SRAM accepting parallel writes from ADC interface and feeding processed data to radar processor. Use Value: Supports burst-mode acquisition at 100 MSPS-equivalent throughput with hardware contention resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C136-35JC | 35 ns tRC, 5 V, 2K × 8, but no battery retention; BUSY is open-drain output (not input) | Requires external arbitration logic for master/slave expansion; unsuitable for 2 V hold applications | Select only if 7142LA35J's BUSY-as-input and data retention are not required |
| AS7C3256B-35JC | 35 ns tRC, 5 V, 32K × 8 - 16× larger density; no BUSY pin; single-port architecture | Cannot support concurrent dual-access; requires software-managed semaphores or external dual-port bridge | Choose only for higher-density, lower-cost single-port use cases without real-time arbitration needs |
Compared with CY7C136-35JC and AS7C3256B-35JC, the 7142LA35J uniquely provides hardware-enforced write-inhibit via BUSY input and guaranteed 2 V data retention - making it irreplaceable in safety-critical dual-access systems where deterministic arbitration and nonvolatile hold are mandatory.
Availability
7142LA35J is available at Aetrix Electronics and suitable for avionics data bus controllers, industrial PLC I/O modules, and military radar preprocessor designs requiring stable component supply, long-term obsolescence management, and traceable sourcing for Class III reliability programs.
Supply support for 7142LA35J 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 7142LA35J belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency shared-memory architectures in real-time embedded systems requiring hardware arbitration and battery backup.
FAQ
What is the function of BUSYL and BUSYR on the 7142LA35J?
On the 7142LA35J, BUSYL and BUSYR are dedicated input-only pins that accept active-low write-inhibit signals from a master device (e.g., IDT7132). When asserted, they internally gate the corresponding port's write path - preventing data corruption during address contention. Unlike the master 7132, the 7142LA35J does not drive BUSY outputs.
Does the 7142LA35J support battery backup operation?
Yes, the 7142LA35J supports battery backup operation with guaranteed data retention at VCC = 2.0 V (typical ICCDR = 100 µA). This feature is exclusive to LA variants and is validated per datasheet Table 6; SA versions lack this capability. Retention is specified at TA = +25°C and is not production-tested but guaranteed.
What is the minimum standby current for the 7142LA35J?
The 7142LA35J achieves a full-standby current (ISB3) of 1.0 µA maximum when both chip enables are held above VCC − 0.2 V and all inputs are at valid CMOS levels (VIN > VCC − 0.2 V or < 0.2 V). This ultra-low current enables multi-year battery hold in maintenance-free embedded deployments.
Which packages are available for the 7142LA35J?
The 7142LA35J is offered in a 48-lead flatpack (FP48) package measuring 0.75 in × 0.75 in × 0.11 in. It is not available in DIP, LCC, or PLCC variants - those packages apply to other members of the 7132/7142 family (e.g., 7142LA35J is FP48-specific; 7142LA35PL is PLCC).
Can the 7142LA35J operate as a standalone dual-port RAM?
No - the 7142LA35J is functionally a slave device: it lacks on-chip arbitration logic and BUSY output capability. It must be paired with a master (e.g., IDT7132) to implement full hardware contention resolution. As a standalone part, it permits independent port access but offers no protection against simultaneous writes to the same address.
7142LA35J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tube
- 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)
7142LA35J FAQ
1.How can I place an order for 7142LA35J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA35J 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 7142LA35J reliable?
The price and inventory of 7142LA35J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA35J is usually 5 days.
3.What payment methods are accepted for 7142LA35J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA35J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA35J?
7142LA35J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA35J 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 7142LA35J?
For technical support, including 7142LA35J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA35J requirements.
6.How does Aetrix verify that 7142LA35J is sourced from the original manufacturer or authorized distributors?
All 7142LA35J 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 7142LA35J meets industry standards.
7.What is the process for return or replacement of 7142LA35J?
All 7142LA35J units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA35J, 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 7142LA35J part is unused and in its original packaging.
Return procedure for 7142LA35J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142LA35J Tags
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