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Renesas 7142LA55J8
- Part No.:
- 7142LA55J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142LA55J8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,905
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Product details
Overview
7142LA55J8 from IDT is a low-power 2K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, featuring 55 ns max read/write cycle time, 1 μA full-standby current (ISB3), 2 V data retention capability, and TTL-compatible 5 V ±10% operation - used for real-time interprocessor communication in avionics and industrial control.
For engineers reviewing the 7142LA55J8 datasheet, 7142LA55J8 pinout, 7142LA55J8 application, or 7142LA55J8 equivalent, this page delivers verified timing parameters, BUSY-input arbitration behavior, package-specific pin mapping (48-pin flatpack), and direct alternatives for 16-bit-or-wider dual-port SRAM designs requiring battery-backed data retention.
Technical Context
The 7142LA55J8 implements independent left/right ports with separate address (A0–A10), control (CEL/CER, OEL/OER, R/WL/R/WR), and bidirectional I/O (I/O0–I/O7) lines, enabling fully asynchronous concurrent access. Its BUSY pin functions strictly as an input - unlike the MASTER 7132 - to gate write operations during address contention.
Arbitration is performed externally via the MASTER 7132's BUSY outputs; the 7142LA55J8 responds to asserted BUSY by inhibiting writes without internal logic or priority resolution. It supports CE-controlled power-down modes yielding ISB3 = 1 μA (typ.) at CMOS-level inputs and retains data down to VCC = 2.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), 16 KB total capacity |
| Access Time (tAA) | 55 ns max - defines minimum address stability before valid read data appears |
| Read Cycle Time (tRC) | 55 ns max - sets shortest interval between successive reads on same port |
| Full Standby Current (ISB3) | 1 μA typ. at VCC = 5 V - enables ultra-low-power battery backup mode |
| Data Retention Voltage | 2.0 V min - guarantees nonvolatile data hold without main supply |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems |
| Supply Voltage | 5.0 V ±10% - single-rail TTL-compatible interface, no level-shifting required |
Pinout & Package
7142LA55J8 is packaged in a 48-lead flatpack (FP48) with 0.75″ × 0.75″ footprint and 0.11″ height. All VCC pins must be connected to 5 V; all GND pins tied to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Common return path for both ports; requires low-impedance connection to minimize noise coupling |
| VCC (Pin 25) | Power supply | Single 5 V ±10% rail powering all logic and memory cells; decoupling capacitor mandatory |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; high state forces port into ISB1/ISB2 standby mode |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers; high state places I/O pins in high-impedance state |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of data flow on bidirectional I/O bus |
| BUSYL / BUSYR | Busy input (left/right) | Active-low signal from MASTER 7132; internally gates write cycles when asserted |
| A0L–A10L / A0R–A10R | Address inputs (left/right) | 11-bit address buses selecting one of 2048 memory locations per port |
| I/O0L–I/O7L / I/O0R–I/O7R | Bidirectional data (left/right) | 8-bit parallel data paths; driven only when corresponding CE and OE are active |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY input architecture | Eliminates need for external arbitration logic when paired with IDT7132 MASTER - simplifies 16+ bit width expansion |
| 2 V data retention | Enables seamless switchover to backup battery during main power loss, preserving critical state in safety-critical systems |
| Ultra-low ISB3 standby current | 1 μA typical draw allows >10-year battery life in always-on monitoring applications using coin-cell backup |
| 55 ns access with industrial temp range | Meets deterministic timing requirements for real-time OS kernels and hard real-time control loops |
| TTL-compatible 5 V interface | Direct connection to legacy microcontrollers, FPGAs, and ASICs without voltage translation circuitry |
Applications
| Avionics Flight Control Interface | Industrial PLC Dual-CPU Communication |
|---|---|
Use Scenario: Two independent flight control processors share sensor fusion results and actuator commands via shared memory. IC Role / Device Role / Timing Role: 7142LA55J8 serves as SLAVE in a 16-bit-wide dual-port array with IDT7132 MASTER, providing contention-free, sub-60 ns inter-processor data exchange. Use Value: BUSY-input arbitration prevents simultaneous writes to identical addresses, eliminating race conditions without software overhead. |
Use Scenario: Redundant CPU modules in a programmable logic controller exchange I/O status and ladder logic variables. IC Role / Device Role / Timing Role: 7142LA55J8 operates as SLAVE in a multi-chip dual-port bank, synchronized to MASTER's BUSY signals for deterministic cross-core updates. Use Value: 2 V data retention preserves last-known safe state during brownout events, supporting fail-safe shutdown sequences. |
| Military Radar Signal Processing Buffer | Medical Imaging Real-Time Frame Store |
Use Scenario: High-speed ADC front-end and DSP back-end access overlapping memory regions for streaming radar pulse data. IC Role / Device Role / Timing Role: 7142LA55J8 provides dedicated SLAVE port for DSP-side reads while ADC writes concurrently - enabled by independent left/right control lines. Use Value: 55 ns tRC ensures pixel-level latency <100 ns, meeting real-time beamforming deadlines in X-band radar systems. |
Use Scenario: MRI scanner subsystem uses dual CPUs to acquire raw k-space data and reconstruct images in parallel. IC Role / Device Role / Timing Role: 7142LA55J8 acts as SLAVE in a mirrored dual-port configuration, buffering reconstructed frames for display engine access. Use Value: ISB3 = 1 μA standby current minimizes thermal load inside sealed medical chassis, avoiding fan-induced vibration artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C133-55JC | 55 ns access, 2K × 8, but lacks 2 V data retention and BUSY-input arbitration logic | Requires external glue logic for contention management; unsuitable for battery backup systems | Select only if cost sensitivity outweighs retention and arbitration needs |
| IDT7134LA55J | Same 2K × 8 slave architecture, but 44-pin PLCC package and no flatpack option | Compatible timing and function, but incompatible footprint - requires PCB redesign | Choose when PLCC mounting is preferred and board space permits re-layout |
Compared with CY7C133-55JC and IDT7134LA55J, the 7142LA55J8 uniquely combines industrial temperature rating, 2 V data retention, and native BUSY-input arbitration in a 48-pin flatpack - making it the only drop-in solution for MIL-STD-810G-rated avionics and medical devices requiring guaranteed data integrity during power transitions.
Availability
7142LA55J8 is available at Aetrix Electronics and suitable for avionics flight control interfaces, industrial PLC dual-CPU communication, and military radar signal processing requiring stable component supply across extended product lifecycles.
Supply support for 7142LA55J8 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 SLAVE dual-port SRAMs to pair with IDT7132 MASTER devices, enabling scalable, glitch-free memory expansion in real-time embedded systems with strict power and reliability requirements.
FAQ
What is the role of BUSY pins on the 7142LA55J8?
The BUSYL and BUSYR pins on the 7142LA55J8 are dedicated inputs - not outputs - that receive active-low BUSY signals from a MASTER IDT7132 device. When asserted, they internally inhibit write operations to the corresponding port, preventing data corruption during address contention. This behavior is fixed and cannot be reconfigured, distinguishing the 7142LA55J8 from MASTER variants.
Does the 7142LA55J8 support battery backup operation?
Yes, the 7142LA55J8 supports true battery backup operation with guaranteed data retention at VCC = 2.0 V (min), as specified in Table 6 of the datasheet. This LA-series feature enables nonvolatile storage during main power failure, and is validated across the full –40°C to +85°C industrial temperature range - a capability absent in SA-series variants.
Which packages are available for the 7142LA55J8?
The 7142LA55J8 is offered exclusively in the 48-lead flatpack (FP48) package, with dimensions of approximately 0.75″ × 0.75″ × 0.11″. Unlike earlier IDT7142 variants, it is not available in DIP, LCC, or PLCC configurations. The "J8" suffix in the part number explicitly denotes the FP48 package variant.
How does the 7142LA55J8 differ from the IDT7132LA55J8?
The 7142LA55J8 is a SLAVE-only dual-port SRAM with BUSY inputs and no on-chip arbitration logic, whereas the IDT7132LA55J8 is a MASTER device featuring BUSY outputs, internal port arbitration, and a dedicated BUSY flag generation circuit. They are complementary - not interchangeable - and must be used together in width-expanded systems.
What is the minimum supply voltage for active operation of the 7142LA55J8?
The 7142LA55J8 requires a minimum supply voltage of 4.5 V for active operation, as defined in the Recommended DC Operating Conditions table (VCC Min = 4.5 V). While it retains data down to 2.0 V, functional read/write operations are only guaranteed within the 4.5–5.5 V range, and operation below 4.5 V may result in timing violations or data corruption.
7142LA55J8 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:
- 55ns
- Access Time:
- 55 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)
7142LA55J8 FAQ
1.How can I place an order for 7142LA55J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA55J8 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 7142LA55J8 reliable?
The price and inventory of 7142LA55J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA55J8 is usually 5 days.
3.What payment methods are accepted for 7142LA55J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA55J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA55J8?
7142LA55J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA55J8 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 7142LA55J8?
For technical support, including 7142LA55J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA55J8 requirements.
6.How does Aetrix verify that 7142LA55J8 is sourced from the original manufacturer or authorized distributors?
All 7142LA55J8 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 7142LA55J8 meets industry standards.
7.What is the process for return or replacement of 7142LA55J8?
All 7142LA55J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA55J8, 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 7142LA55J8 part is unused and in its original packaging.
Return procedure for 7142LA55J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142LA55J8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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