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Renesas 7142LA25J8
- Part No.:
- 7142LA25J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142LA25J8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,817
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Product details
Overview
IDT7142LA25J8 from Integrated Device Technology (IDT) is a high-speed 2K × 8 dual-port static RAM configured as a slave device in master/slave memory expansion architectures. It features 25 ns maximum access time, 1 mW typical standby power, battery-backed data retention down to 2 V, and operates on a single 5 V ±10% supply. It is used in real-time embedded systems requiring concurrent read/write access across independent processor or DMA channels.
For engineers reviewing the IDT7142LA25J8 datasheet, IDT7142LA25J8 pinout, IDT7142LA25J8 application, or IDT7142LA25J8 equivalent, key selection criteria include BUSY input timing for port arbitration, low-power standby current under CMOS-level control, dual-port address/data isolation, and compatibility with IDT7132 master devices in 16-bit+ width expansions.
Technical Context
The IDT7142LA25J8 implements a fully asynchronous dual-port SRAM architecture with independent left/right address, control, and I/O buses. Its BUSY pin functions exclusively as an input-unlike the IDT7132 master-to gate write operations during contention, with tWB = 0 ns and tWH ≥ 12 ns minimum hold after BUSY assertion.
It supports two distinct power-down modes: TTL-level standby (ISB1/ISB2) and full CMOS-level standby (ISB3/ISB4), delivering 0.2 µA typical ISB3 current. Fabricated in CMOS, it achieves 200 µW typical battery-retention power at VCC = 2 V, enabling nonvolatile operation without external backup circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 bits (2048 words × 8-bit data width per port) |
| Access Time (max) | 25 ns - guarantees worst-case read latency for real-time deterministic response |
| Supply Voltage | 5.0 V ±10% - compatible with standard TTL/CMOS logic rails; no separate VDDQ required |
| Standby Current (ISB3) | 0.2 µA typ. - enables ultra-low-power battery retention mode with 2 V VCC |
| BUSY Function | Input-only - internally inhibits writes when asserted; requires external pull-up for open-drain master interface |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications |
| Package | 48-pin Flatpack (J8) - hermetically sealed, leadless ceramic package for high-reliability environments |
Pinout & Package
Package: 48-pin Flatpack (J8), hermetic ceramic, body size ≈ 0.75 in × 0.75 in × 0.11 in. Pin 1 index corner marked; all VCC pins must be connected to +5 V, all GND pins to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 48) | Ground reference | Three dedicated ground pins minimize ground bounce in high-speed dual-port switching |
| VCC (Pin 25) | Power supply | Single 5 V supply powers both ports; decoupling required at pin |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls port-specific power-down entry/exit |
| OEL / OER | Output enable (left/right) | Active-low enables I/O drivers; high-Z state isolates bus during contention or idle |
| R/WL / R/WR | Read/write control (left/right) | Active-low write; high = read; determines direction of data flow on I/O lines |
| BUSYL / BUSYR | BUSY input (left/right) | Asynchronous write-inhibit signal from IDT7132 master; must be pulled up externally |
| A0L–A10L / A0R–A10R | Address inputs (left/right) | 11-bit address per port selects one of 2048 locations independently |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data bus per port; high-impedance when OE or CE inactive |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration via BUSY input | Enables deterministic resolution of simultaneous same-address access without software overhead or external logic |
| Battery-backed data retention | Maintains stored data at 2 V VCC with only 100 µA typical ICCDR - eliminates need for external backup battery management |
| Ultra-low standby power | 0.2 µA ISB3 current allows years of retention in battery-critical applications such as medical telemetry or remote sensors |
| Industrial temperature range | –40°C to +85°C operation validated across full speed grade - suitable for engine control units and factory automation |
| Master/slave expandability | Supports seamless 16-bit+ word width expansion using IDT7132 master with automatic BUSY propagation - no glue logic required |
Applications
| Real-Time Digital Signal Processing | Redundant Control Systems |
|---|---|
Use Scenario: Two DSP cores concurrently access shared coefficient or filter buffer memory without pipeline stalls. IC Role / Device Role / Timing Role: Slave dual-port RAM providing synchronized, contention-managed memory access between independent processing units. Use Value: Eliminates software arbitration delays; 25 ns access ensures sub-cycle memory availability for 40 MHz DSP clocks. |
Use Scenario: Primary and backup controllers maintain identical state snapshots in lockstep, with cross-checking on every cycle. IC Role / Device Role / Timing Role: Dual-port interface enabling simultaneous read (primary) and write (backup) to mirrored memory space. Use Value: Hardware BUSY arbitration prevents inconsistent state updates; 0.2 µA ISB3 enables fail-safe retention during main power loss. |
| Avionics Data Acquisition | Industrial Motion Controller Buffer |
Use Scenario: Sensor acquisition FPGA writes raw ADC data while flight computer reads processed frames - both at full throughput. IC Role / Device Role / Timing Role: High-reliability slave RAM interfacing between radiation-tolerant FPGA and safety-certified microcontroller. Use Value: J8 flatpack package meets MIL-PRF-38535 QML requirements; 25 ns timing supports 40 MSPS sampling-to-read latency. |
Use Scenario: Servo drive CPU preloads motion profiles while position loop hardware reads trajectory points in real time. IC Role / Device Role / Timing Role: Low-latency buffer decoupling high-level planning from deterministic servo execution. Use Value: 2K × 8 capacity holds >100 ms of interpolated motion data; 1 mW active power minimizes thermal load in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C136-25JC | 5V, 2K × 8, 25 ns, but uses bidirectional BUSY (I/O) rather than dedicated input; no battery retention | Requires external arbitration logic for master/slave expansion; unsuitable for 2 V backup scenarios | Select when legacy Cypress footprint compatibility is required and battery retention is unnecessary |
| AS7C3256B-25JC | 5V, 32K × 8, 25 ns, single-port only; no BUSY logic or dual-port arbitration | Cannot replace dual-port functionality - requires redesign with external FIFO or dual-CPU interface logic | Consider only for capacity upgrade paths where dual-port concurrency is handled at system level |
Compared with CY7C136-25JC and AS7C3256B-25JC, the IDT7142LA25J8 uniquely delivers hardware-enforced write inhibition via dedicated BUSY input and guaranteed 2 V data retention - critical for fault-tolerant industrial and avionics designs where deterministic arbitration and zero-power memory persistence are mandatory.
Availability
IDT7142LA25J8 is available at Aetrix Electronics and suitable for real-time digital signal processing, redundant control systems, and avionics data acquisition requiring stable component supply, long-term lifecycle support, and industrial-temperature reliability.
Supply support for IDT7142LA25J8 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
Integrated Device Technology (IDT) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019. IDT's dual-port SRAMs were engineered for deterministic real-time systems.
The IDT7142LA25J8 belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for master/slave memory expansion in fault-tolerant embedded systems requiring concurrent access, hardware arbitration, and battery-backed retention.
FAQ
What is the function of the BUSY pins on the IDT7142LA25J8?
The BUSYL and BUSYR pins on the IDT7142LA25J8 serve exclusively as inputs - unlike the IDT7132 master - and are used to inhibit write operations when asserted low by an external IDT7132 master device. When BUSY is low, internal write gating blocks data from being written to memory, preventing corruption during port contention. The IDT7142LA25J8 does not drive BUSY; it responds to it.
Does the IDT7142LA25J8 support battery backup operation?
Yes, the IDT7142LA25J8 supports battery backup operation with guaranteed data retention at VCC = 2.0 V. In this mode, it draws only 100 µA typical ICCDR current, enabling multi-year retention from a small coin cell. This capability is exclusive to LA versions and is not available in SA variants. The IDT7142LA25J8 retains full 2K × 8 memory contents without refresh during backup.
What is the difference between IDT7142LA25J8 and IDT7132LA25J8?
The IDT7142LA25J8 is a slave-only dual-port SRAM with BUSY inputs, while the IDT7132LA25J8 is the master device featuring BUSY outputs and on-chip arbitration logic. The IDT7142LA25J8 cannot operate standalone in arbitration mode - it requires an IDT7132LA25J8 (or compatible master) to drive its BUSY pins. Both share identical timing (25 ns), power specs, and pinout except for BUSY directionality and absence of arbitration logic in the IDT7142LA25J8.
Which packages are available for the IDT7142LA25J8?
The IDT7142LA25J8 is offered in the 48-pin Flatpack (J8) package - a hermetically sealed, leadless ceramic package with dimensions approximately 0.75 in × 0.75 in × 0.11 in. This package is distinct from DIP, LCC, or PLCC variants and is specified for high-reliability industrial and military applications. The "J8" suffix in the part number explicitly denotes this flatpack configuration.
Can the IDT7142LA25J8 be used without a master device like the IDT7132?
Yes, the IDT7142LA25J8 can operate as a stand-alone dual-port SRAM without a master device, provided BUSYL and BUSYR are held high (via pull-up resistors) to disable write inhibition. In this configuration, both ports function independently with full read/write capability - but hardware arbitration for same-address contention is disabled. The IDT7142LA25J8 retains all timing, power, and retention specifications in standalone mode.
7142LA25J8 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:
- 25ns
- Access Time:
- 25 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)
7142LA25J8 FAQ
1.How can I place an order for 7142LA25J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA25J8 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 7142LA25J8 reliable?
The price and inventory of 7142LA25J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA25J8 is usually 5 days.
3.What payment methods are accepted for 7142LA25J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA25J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA25J8?
7142LA25J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA25J8 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 7142LA25J8?
For technical support, including 7142LA25J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA25J8 requirements.
6.How does Aetrix verify that 7142LA25J8 is sourced from the original manufacturer or authorized distributors?
All 7142LA25J8 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 7142LA25J8 meets industry standards.
7.What is the process for return or replacement of 7142LA25J8?
All 7142LA25J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA25J8, 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 7142LA25J8 part is unused and in its original packaging.
Return procedure for 7142LA25J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142LA25J8 Tags
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