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Renesas 7143LA25JI8
- Part No.:
- 7143LA25JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7143LA25JI8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,352
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Product details
Overview
7143LA25JI8 from Integrated Device Technology (IDT) is a high-speed 2K × 16 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 with 25 ns max read cycle time, 2V data retention, and industrial temperature range (–40°C to +85°C), used in real-time embedded control and military-grade avionics interprocessor communication.
For engineers reviewing the 7143LA25JI8 datasheet, 7143LA25JI8 pinout, 7143LA25JI8 application, or 7143LA25JI8 equivalent, key selection criteria include BUSY input functionality for contention arbitration, low-power active/standby current (230 mA typ / 0.2 mA typ), 68-pin PLCC package compatibility, and TTL-level 5V ±10% operation with battery backup support.
Technical Context
The 7143LA25JI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - left port (A0L–A10L, I/O0L–I/O15L) and right port (A0R–A10R, I/O0R–I/O15R). It lacks on-chip arbitration logic and uses BUSYR/BUSYL as dedicated inputs to accept arbitration signals from a MASTER IDT7133 device.
Its low-power LA variant delivers 1050 mW typical active power and 1 mW typical standby power, enabled by CMOS process optimization and automatic CE-controlled power-down. Data retention at VCC = 2V is guaranteed with ICCDR ≤ 4000 µA (military/industrial) and tCDR = 0 ns chip deselect-to-retention delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 16-bit (32 Kbit), organized as 2048 words × 16 bits per port |
| Access Time | 25 ns maximum read cycle time (tRC), enabling 40 MHz sustained throughput per port |
| Supply Voltage | 5.0 V ±10% (4.5–5.5 V), single-rail TTL-compatible operation |
| Operating Temp | –40°C to +85°C (industrial grade), qualified per MIL-PRF-38535 QML for ruggedized use |
| Standby Current | 0.2 mA typical (ISB3, full CMOS standby), critical for battery-backed systems |
| Data Retention | 2 V minimum VCC for data retention, supporting backup battery operation without refresh |
| Power Dissipation | 1050 mW typical active power, optimized for thermal management in dense PCB layouts |
Pinout & Package
7143LA25JI8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 0.95 in × 0.95 in × 0.17 in, with dual-row gull-wing leads and standard JEDEC MO-047 footprint. Both VCC (pins 17, 51) and GND (pins 35, 68) require connection for reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left Port Address Inputs | 11-bit address bus for left port (2048 locations); must be stable before CE or OE assertion |
| A0R–A10R | Right Port Address Inputs | 11-bit address bus for right port; independent timing enables true concurrent access |
| I/O0L–I/O15L | Left Port Bidirectional Data | 16-bit data path; direction controlled by R/WLUB/R/WLLB and OEL |
| I/O0R–I/O15R | Right Port Bidirectional Data | 16-bit data path; isolated from left port to prevent bus contention |
| CEL / CER | Chip Enable (Left/Right) | Active-low enables port access; drives internal circuitry into 0.2 mA standby when high |
| R/WLUB / R/WLLB | Left Upper/Lower Byte Write Enable | Independent byte-level write control permits partial-word updates without read-modify-write |
| R/WRUB / R/WRLB | Right Upper/Lower Byte Write Enable | Enables selective 8-bit writes on right port, reducing bus traffic in mixed-data-width systems |
| OEL / OER | Output Enable (Left/Right) | Tri-states I/O pins when high; allows shared bus usage with other peripherals |
| BUSYL / BUSYR | Busy Input (SLAVE mode) | Asynchronous write-inhibit inputs driven by MASTER IDT7133; must be pulled high for normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous operation | Enables simultaneous independent reads/writes on left and right ports without clock synchronization |
| SLAVE-only BUSY interface | BUSYL/BUSYR accept external arbitration signals-no internal arbitration logic reduces latency and complexity |
| Byte-selectable write control | Separate upper/lower byte write enables per port allow 8-bit granularity writes, minimizing bus cycles |
| 2V data retention | Maintains stored data during main power loss using backup battery, eliminating need for external nonvolatile storage |
| Industrial temperature qualification | Validated across –40°C to +85°C with full AC/DC specs, suitable for automotive engine control and industrial PLCs |
| 68-pin PLCC package | Standard surface-mount footprint with mechanical robustness and thermal performance suited for high-reliability assemblies |
Applications
| Avionics Interprocessor Communication | Military Radar Signal Buffering |
|---|---|
Use Scenario: Two dissimilar processors (e.g., PowerPC and FPGA) exchange real-time sensor fusion data via shared memory. IC Role / Device Role / Timing Role: 7143LA25JI8 serves as SLAVE buffer in a 32-bit wide MASTER/SLAVE pair, accepting BUSY arbitration from IDT7133 to prevent simultaneous writes to same address. Use Value: Eliminates software-based semaphores and guarantees deterministic <25 ns access latency under contention, meeting DO-254 Level A timing requirements. |
Use Scenario: High-speed ADC samples radar return signals at 100 MSPS; data must be buffered and transferred to DSP without jitter or loss. IC Role / Device Role / Timing Role: 7143LA25JI8 provides dual-port buffering where ADC writes to left port while DSP reads from right port asynchronously. Use Value: 25 ns tRC and zero-cycle bus turnaround enable continuous streaming at full sample rate; 2V retention preserves last frame during power interruption. |
| Industrial PLC I/O Mapping Memory | Secure Bootloader Shared Memory |
Use Scenario: Programmable logic controller uses dual-port RAM to decouple field I/O scanning (real-time task) from HMI update (non-real-time task). IC Role / Device Role / Timing Role: 7143LA25JI8 acts as SLAVE in a multi-chip 64-bit memory bank, synchronized via centralized IDT7133 MASTER arbitration. Use Value: Hardware BUSY signaling prevents race conditions during I/O state updates, ensuring deterministic scan cycle times per IEC 61131-3. |
Use Scenario: Secure bootloader and application firmware share configuration parameters and cryptographic keys in tamper-resistant memory. IC Role / Device Role / Timing Role: 7143LA25JI8 stores boot-critical data with 2V retention; left port accessed by bootloader, right port by runtime firmware. Use Value: Battery-backed retention maintains keys across cold starts; byte-selectable writes allow atomic updates of individual parameter fields. |
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 × 16, 25 ns, 5V, but no BUSY arbitration support; requires external logic for contention resolution | Lacks native MASTER/SLAVE arbitration; unsuitable for width-expanded systems without added gates | Select only if system uses single chip or implements arbitration in FPGA logic |
| IDT7133LA25JI8 | Same family, identical pinout and timing, but MASTER variant with on-chip arbitration and open-drain BUSY output | Provides hardware arbitration and can drive BUSY inputs of 7143LA25JI8; required for multi-chip width expansion | Required companion part when deploying 7143LA25JI8 in 32-bit+ systems |
Compared with CY7C133-25JC, 7143LA25JI8 eliminates external arbitration components and reduces board area; compared with IDT7133LA25JI8, it removes redundant arbitration logic-enabling lower-cost, lower-power SLAVE-only deployment in scalable memory architectures.
Availability
7143LA25JI8 is available at Aetrix Electronics and suitable for avionics interprocessor communication, military radar signal buffering, and industrial PLC I/O mapping requiring stable component supply across extended product lifecycles and rigorous environmental qualification.
Supply support for 7143LA25JI8 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions, acquired by Renesas Electronics in 2019.
The IDT7133/7143 family was designed specifically for high-reliability dual-ported memory applications demanding deterministic arbitration, battery backup, and military-grade temperature operation - targeting defense, aerospace, and industrial control markets.
FAQ
What is the role of BUSYL and BUSYR on the 7143LA25JI8?
BUSYL and BUSYR are dedicated input pins on the 7143LA25JI8 that accept arbitration signals from a MASTER IDT7133 device. Unlike the MASTER's open-drain BUSY outputs, these inputs gate write operations when asserted - preventing simultaneous writes to the same memory location. For normal operation, both pins must be tied HIGH; pulling either LOW disables writes to that port entirely. This SLAVE-only behavior is intrinsic to the 7143LA25JI8 design and enables clean width expansion without external logic.
Can the 7143LA25JI8 operate without a MASTER IDT7133 device?
Yes, the 7143LA25JI8 can operate as a standalone dual-port SRAM without a MASTER device. In this mode, BUSYL and BUSYR must be externally held HIGH (e.g., via pull-up resistors) to disable write inhibition. All dual-port functionality - independent read/write access, byte-selectable writes, and 25 ns timing - remains fully operational. However, hardware arbitration for multi-chip width expansion requires pairing with an IDT7133LA25JI8 or compatible MASTER; the 7143LA25JI8 alone does not generate BUSY signals.
What is the significance of the 'LA' suffix in 7143LA25JI8?
The 'LA' suffix in 7143LA25JI8 denotes the Low-Power Active/Standby variant: it consumes 1050 mW typical active power and just 1 mW typical standby current (ISB3), versus 1150 mW/5 mW for the SA version. Crucially, LA devices support 2V data retention - maintaining memory contents during main power loss using a backup battery. This feature is confirmed in datasheet Table 8 and is exclusive to LA-grade parts like the 7143LA25JI8, making it essential for fail-safe and hot-swap applications.
Which package does the 7143LA25JI8 use, and what are its mounting requirements?
The 7143LA25JI8 uses a 68-pin Plastic Leaded Chip Carrier (PLCC) package, identified by suffix 'J' in the part number and documented in drawing 2746 drw 02. Its body measures approximately 0.95 in × 0.95 in × 0.17 in. Critical mounting requirements include connecting both VCC pins (17 and 51) to the 5V supply and both GND pins (35 and 68) to ground - failure to do so causes unreliable operation. The PLCC's gull-wing leads support standard reflow soldering and offer superior mechanical reliability over fine-pitch alternatives in high-vibration environments.
How does the 7143LA25JI8 handle simultaneous access to the same memory address from both ports?
The 7143LA25JI8 has no internal arbitration logic and does not resolve simultaneous accesses - it relies entirely on external BUSY signaling from a MASTER IDT7133. When both ports attempt access to the same address, the MASTER asserts BUSYL or BUSYR, which the 7143LA25JI8 treats as a write-inhibit command. If a write is attempted while BUSY is active, the internal write path is gated off; reads proceed unimpeded. This SLAVE-only behavior ensures deterministic resolution without internal race conditions - a core architectural distinction from monolithic dual-port SRAMs with built-in arbiters.
7143LA25JI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 68-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:
- 32Kbit
- Memory Organization:
- 2K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.21x24.21)
7143LA25JI8 FAQ
1.How can I place an order for 7143LA25JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7143LA25JI8 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 7143LA25JI8 reliable?
The price and inventory of 7143LA25JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7143LA25JI8 is usually 5 days.
3.What payment methods are accepted for 7143LA25JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7143LA25JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7143LA25JI8?
7143LA25JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7143LA25JI8 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 7143LA25JI8?
For technical support, including 7143LA25JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7143LA25JI8 requirements.
6.How does Aetrix verify that 7143LA25JI8 is sourced from the original manufacturer or authorized distributors?
All 7143LA25JI8 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 7143LA25JI8 meets industry standards.
7.What is the process for return or replacement of 7143LA25JI8?
All 7143LA25JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7143LA25JI8, 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 7143LA25JI8 part is unused and in its original packaging.
Return procedure for 7143LA25JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7143LA25JI8 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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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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