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Renesas 7142LA20JG
- Part No.:
- 7142LA20JG
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142LA20JG.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,746
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Product details
Overview
7142LA20JG 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, 20 ns read cycle time (max), 5 V ±10% supply, industrial temperature range (–40°C to +85°C), and battery-backed data retention at 2 V - used in real-time avionics bus controllers requiring concurrent host/DSP memory access.
For engineers reviewing the 7142LA20JG datasheet, 7142LA20JG pinout, 7142LA20JG application, or 7142LA20JG equivalent, key selection criteria include BUSY input behavior (not output), LA-series ultra-low standby current (1 µA full standby), 48-pin flatpack package compatibility, and strict timing coordination with IDT7132 master for contention arbitration in 16-bit+ width expansions.
Technical Context
The 7142LA20JG implements a true dual-port SRAM architecture with fully independent address, control, and I/O buses per port - no internal multiplexing or arbitration logic. Its BUSY pin functions exclusively as an input (unlike the IDT7132 master), enabling write-inhibit gating when asserted by a companion IDT7132 during address-contention events.
It supports two distinct power modes: active operation (typ. 325 mW) and full CMOS standby (ISB3 ≤ 0.2 mA typ., ≤ 4 µA max at 25°C), with guaranteed 2 V data retention - a feature exclusive to LA variants and absent in SA versions. Timing parameters are validated for industrial-grade operation across all 48-pin packages (FP48, LC48, PDG48, SB48).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8-bit parallel I/O per port) |
| Read Cycle Time (tRC) | 20 ns maximum - defines minimum interval between successive reads on same port |
| Full Standby Current (ISB3) | ≤ 4 µA at 25°C - enables battery backup with <200 µW total consumption |
| Supply Voltage | 5.0 V ±10% - TTL-compatible single-rail operation; no auxiliary supplies required |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control and avionics subsystems |
| Data Retention Voltage | 2.0 V minimum - preserves stored contents during main power loss without external circuitry |
| Package Type | 48-pin flatpack (JG suffix) - hermetically sealed, leadless ceramic, MIL-PRF-38535 QML-compliant |
Pinout & Package
7142LA20JG is supplied in a 48-pin flatpack (JG) package: 0.75″ × 0.75″ × 0.11″ body size, side-brazed ceramic construction, compliant with MIL-PRF-38535 QML Class V. Pin 1 index corner marked; all VCC pins (pins 24, 48) require local decoupling; all GND pins (pins 1, 25) must be low-inductance grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 25) | Ground reference | Common return for both ports; must be connected to system ground plane with minimal impedance |
| VCC (24, 48) | Power supply | 5 V ±10% supply for core and I/O; requires 0.1 µF ceramic + 10 µF tantalum decoupling per VCC pin |
| CEL / CER | Chip enable (left/right) | Active-low port select; drives ISB1/ISB2 standby modes when high; controls port activation timing |
| OEL / OER | Output enable (left/right) | Active-low control of I/O drivers; places I/O pins in high-Z when deasserted, enabling bus sharing |
| R/WL / R/WR | Read/write direction (left/right) | High = read, low = write; determines data flow direction independently per port |
| BUSYL / BUSYR | Busy input (left/right) | Active-low write-inhibit signal sourced from IDT7132 master; 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; no internal latching |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data bus per port; driven only when CE and OE active; high-Z otherwise |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY interface | Eliminates need for external arbitration logic when paired with IDT7132 master in width-expanded systems |
| 2 V data retention | Preserves memory contents during brownout or main power failure without external backup circuitry |
| Ultra-low ISB3 standby | Enables <200 µW battery operation - critical for long-life remote sensor nodes and avionics black boxes |
| Independent port timing | Allows simultaneous read on one port and write on the other - essential for real-time DSP/host co-processing |
| MIL-PRF-38535 QML Class V | Guarantees reliability, screening, and traceability for defense and aerospace deployments |
| 48-pin flatpack (JG) | Hermetic ceramic package with superior thermal stability and moisture resistance vs. plastic alternatives |
Applications
| Avionics Data Bus Controller | DSP-Based Real-Time Signal Processor |
|---|---|
Use Scenario: Concurrent access to shared memory by flight computer (left port) and radar DSP (right port) in ARINC 429 or MIL-STD-1553 interface modules. IC Role / Device Role / Timing Role: Slave dual-port SRAM providing non-blocking memory access with hardware BUSY arbitration via IDT7132 master. Use Value: Eliminates software polling or semaphore overhead; guarantees deterministic <20 ns memory latency for both processors. |
Use Scenario: Real-time FFT buffer in airborne electronic warfare receiver where ADC front-end writes to one port while FFT engine reads from the other. IC Role / Device Role / Timing Role: Low-power LA variant enabling battery-backed buffer retention during aircraft power cycling. Use Value: Maintains last valid FFT frame during 2 V brownout - avoids reacquisition delay after main power restoration. |
| Industrial PLC Motion Controller | Military Vehicle Health Monitoring System |
Use Scenario: Synchronized motion trajectory storage accessed simultaneously by safety watchdog (left port) and servo update engine (right port). IC Role / Device Role / Timing Role: Industrial-temp 7142LA20JG operating in -40°C to +85°C environment with full 20 ns timing compliance. Use Value: Enables hard real-time response (<1 µs jitter) without dynamic voltage/frequency scaling or thermal derating. |
Use Scenario: Mission-critical health data logging in armored vehicle ECU, retaining last 2 KB of sensor history during engine-off battery drain. IC Role / Device Role / Timing Role: QML Class V flatpack variant ensuring radiation tolerance and long-term parametric stability. Use Value: Guarantees 10+ year data integrity under vibration, thermal shock, and wide-voltage battery conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C133-25JC | 2K × 8, 25 ns, 5 V, but no BUSY input - uses separate BUSY output and requires external arbitration logic | Lacks native master/slave BUSY handshake; unsuitable for plug-in replacement in IDT7132/7142 width-expansion topologies | Select only if redesigning arbitration layer and accepting higher board area and timing uncertainty |
| IDT7142LA25JG | Same family, identical pinout and function, but 25 ns read cycle - relaxed timing margin, lower power at reduced speed | Compatible in footprint and firmware; usable where 20 ns is not required, e.g., non-real-time diagnostics subsystems | Drop-in substitute if system timing budget allows 5 ns relaxation and lower ICC/ISB trade-off is acceptable |
Compared with CY7C133-25JC and IDT7142LA25JG, the 7142LA20JG uniquely delivers 20 ns deterministic access with integrated BUSY-input arbitration and 2 V data retention - making it irreplaceable in legacy IDT master/slave designs requiring guaranteed contention resolution and battery backup.
Availability
7142LA20JG is available at Aetrix Electronics and suitable for avionics data bus controllers, industrial PLC motion controllers, and military vehicle health monitoring systems requiring stable component supply, long-lifecycle support, and MIL-qualified packaging.
Supply support for 7142LA20JG 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 IDT7132/7142 product line was designed specifically for deterministic, contention-free dual-port memory expansion in real-time embedded systems - emphasizing hardware arbitration, low-power retention, and military-grade reliability.
FAQ
What is the function of BUSYL and BUSYR on the 7142LA20JG?
On the 7142LA20JG, BUSYL and BUSYR are dedicated input pins - not outputs - that accept active-low busy signals from an IDT7132 master 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; the 7142LA20JG does not generate BUSY signals.
Can the 7142LA20JG operate as a standalone dual-port RAM without an IDT7132 master?
Yes, the 7142LA20JG can operate standalone: both BUSYL and BUSYR must be held high (via pull-up resistors) to enable normal read/write functionality on both ports. However, in this configuration, no hardware arbitration occurs - simultaneous writes to the same address will result in undefined data, requiring external logic or software coordination to avoid contention.
What is the significance of the 'JG' suffix in 7142LA20JG?
The 'JG' suffix denotes a 48-pin ceramic flatpack package meeting MIL-PRF-38535 QML Class V requirements. It specifies hermetic sealing, side-brazed leads, 0.75″ × 0.75″ footprint, and qualification for high-reliability military/aerospace use - distinct from plastic DIP (PDG48), LCC (LC48), or PLCC (PLG52) variants of the same part number.
Does the 7142LA20JG support battery backup at voltages below 5 V?
Yes - the 7142LA20JG supports guaranteed data retention at VCC = 2.0 V (minimum), consuming ≤4 µA in full standby (ISB3). This enables direct connection to a backup lithium cell or supercapacitor without regulators or diode-OR circuits. Note: active operation requires 4.5–5.5 V; retention mode is strictly for data preservation during main power loss.
How does the 7142LA20JG differ from the 7142SA20JG?
The 7142LA20JG and 7142SA20JG share identical speed (20 ns), pinout, and functionality - but differ critically in power: LA offers 1 µA typical full standby (ISB3) and 2 V data retention, while SA draws 15 µA typical ISB3 and has no retention capability. LA uses optimized CMOS process for ultra-low leakage; SA prioritizes cost and speed consistency over retention.
7142LA20JG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 20ns
- Access Time:
- 20 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)
7142LA20JG FAQ
1.How can I place an order for 7142LA20JG through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA20JG 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 7142LA20JG reliable?
The price and inventory of 7142LA20JG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA20JG is usually 5 days.
3.What payment methods are accepted for 7142LA20JG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA20JG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA20JG?
7142LA20JG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA20JG 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 7142LA20JG?
For technical support, including 7142LA20JG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA20JG requirements.
6.How does Aetrix verify that 7142LA20JG is sourced from the original manufacturer or authorized distributors?
All 7142LA20JG 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 7142LA20JG meets industry standards.
7.What is the process for return or replacement of 7142LA20JG?
All 7142LA20JG units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA20JG, 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 7142LA20JG part is unused and in its original packaging.
Return procedure for 7142LA20JG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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