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Renesas 7143LA20J
- Part No.:
- 7143LA20J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7143LA20J.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,133
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Product details
Overview
7143LA20J from IDT is a low-power, high-speed 2K × 16 dual-port static RAM designed as a SLAVE device in MASTER/SLAVE memory expansion systems. It features 20 ns max read cycle time, 2V data retention, 1 mW typical standby power, and operates across industrial temperature (–40°C to +85°C) with single 5V ±10% supply. Used in real-time DSP co-processing and redundant control subsystems requiring concurrent port access.
For engineers reviewing the 7143LA20J datasheet, 7143LA20J pinout, 7143LA20J application, or 7143LA20J equivalent, key selection criteria include BUSY input behavior (not output), absence of on-chip arbitration logic, byte-selectable write control per port, and compatibility with IDT7133LA20J master for 32-bit+ bus expansion without external logic.
Technical Context
The 7143LA20J implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its BUSY pin functions exclusively as a write-inhibit input - unlike the IDT7133 - enabling deterministic contention resolution when paired with a MASTER device.
It supports separate upper- and lower-byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), TTL-compatible signaling, and automatic power-down via chip enable (CEL/CER). Battery backup mode retains data at VCC = 2V with ICCDR ≤ 4 mA (commercial) or ≤ 4 µA (industrial/military).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 16 bits (32 KB total, organized as 2048 words × 16 bits) |
| Access Time | 20 ns max read cycle time - defines minimum clock period for synchronous interface or maximum sustained throughput in asynchronous systems |
| Supply Voltage | 5.0 V ±10% - requires stable single-rail supply; both VCC pins must be connected for reliable operation |
| Standby Power | 1 mW typical - enables ultra-low-power hold mode during CPU idle cycles in battery-backed systems |
| Data Retention | 2 V minimum VCC - allows operation from coin-cell backup without regulator, retaining data indefinitely at room temperature |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including motor drives and PLCs |
| I/O Interface | TTL-compatible - interfaces directly with legacy 5V microcontrollers, FPGAs, and DSPs without level-shifting |
Pinout & Package
7143LA20J is packaged in a 68-pin PLCC (PLG68) with 0.95″ × 0.95″ footprint. Pin layout matches IDT7133LA20J for drop-in width-expansion compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enables respective port; controls power-down state - high = standby, low = active |
| R/WLUB / R/WRUB | Upper Byte Write Enable | Asserted low to write I/O8–I/O15 on left/right port independently |
| R/WLLB / R/WRLB | Lower Byte Write Enable | Asserted low to write I/O0–I/O7 on left/right port independently |
| OEL / OER | Output Enable (Left / Right) | Controls tri-state of I/O drivers - low enables read data output |
| BUSYL / BUSYR | Busy Input (Left / Right) | Active-low write-inhibit signal - must be high to permit writes; driven by MASTER's BUSY output |
| A0L–A10L / A0R–A10R | Address Inputs | 11-bit address per port selects one of 2048 locations; fully asynchronous between ports |
| I/O0L–I/O15L / I/O0R–I/O15R | Data I/O (Bidirectional) | 16-bit parallel data bus per port; high-impedance when CE or OE inactive |
| VCC (×2) | Power Supply | Both pins must be connected to 5V ±10%; decoupling required near each pin |
| GND (×2) | Ground | Both pins must be connected to system ground; critical for noise immunity and timing integrity |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY interface | Eliminates need for external arbitration logic when expanding bus width beyond 16 bits using IDT7133 MASTER |
| Byte-selectable write control | Enables partial-word updates (e.g., 8-bit register writes) without read-modify-write cycles |
| 2V data retention | Supports seamless switchover to backup power in fail-safe systems - no data loss during main supply interruption |
| Low standby current (1 mW typ.) | Reduces system-level power budget in always-on monitoring applications such as industrial sensors |
| Industrial temperature range | Validated operation from –40°C to +85°C ensures reliability in uncontrolled enclosures and outdoor equipment |
Applications
| Real-Time DSP Co-Processing | Redundant Control Subsystems |
|---|---|
Use Scenario: Two independent processors (e.g., ARM Cortex-M7 + SHARC DSP) share memory for low-latency data exchange in motor control loops. IC Role / Device Role / Timing Role: SLAVE dual-port RAM provides synchronized, contention-free access to shared coefficient tables and status registers. Use Value: Eliminates software semaphores and polling overhead - deterministic latency under 20 ns enables sub-microsecond inter-processor handshaking. | Use Scenario: Dual-channel safety PLC where primary and backup controllers monitor identical I/O but only one writes to actuator outputs. IC Role / Device Role / Timing Role: 7143LA20J acts as shared diagnostic buffer, with BUSY input from MASTER enforcing write priority to prevent conflicting commands. Use Value: Hardware-enforced write arbitration ensures fail-operational behavior - no race conditions during controller switchover. |
| Avionics Data Buffering | Test Equipment Pattern Memory |
Use Scenario: ARINC 429 receiver and transmitter share telemetry buffers in airborne health-monitoring unit. IC Role / Device Role / Timing Role: SLAVE RAM stores incoming sensor frames while simultaneously supplying preformatted response packets to transceiver port. Use Value: Concurrent read/write avoids FIFO bottlenecks - full 16-bit bandwidth sustains 100 kbps serial link throughput without packet loss. | Use Scenario: Automated test system generates and validates high-speed digital patterns using FPGA-based pattern generator and comparator. IC Role / Device Role / Timing Role: 7143LA20J holds stimulus vectors on left port and captures expected responses on right port during parallel test execution. Use Value: Asynchronous dual-port architecture enables real-time comparison at 50 MHz - eliminates need for external synchronization logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7143SA20J | Higher active power (1150 mW vs. 1050 mW typ.), no 2V data retention | Suitable for commercial-temp, non-battery-backed systems where speed is prioritized over power | Select when operating temperature is 0°C to +70°C and backup power is not required |
| Cypress CY7C1371DV25 | 3.3V core, different pinout, no native BUSY input - requires external arbitration logic | Used in modern low-voltage designs; lacks integrated MASTER/SLAVE expansion capability | Choose only if migrating to 3.3V infrastructure and redesigning arbitration circuitry |
Compared with IDT7143SA20J and CY7C1371DV25, the 7143LA20J uniquely delivers industrial-temperature operation, 2V data retention, and hardware-integrated SLAVE arbitration - making it irreplaceable in battery-backed, safety-critical width-expansion architectures.
Availability
7143LA20J is available at Aetrix Electronics and suitable for real-time DSP co-processing, redundant control subsystems, avionics data buffering, and test equipment pattern memory requiring stable component supply across extended lifecycle programs.
Supply support for 7143LA20J 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 timing, memory interface, RF, and high-performance silicon solutions, now part of Renesas Electronics.
The IDT7143 product line was engineered specifically for MASTER/SLAVE dual-port RAM expansion in industrial and military systems - delivering deterministic arbitration, low-power retention, and pin-compatible scalability from 16-bit to 64-bit data paths.
FAQ
What is the role of the BUSY pin on the 7143LA20J?
The BUSY pin on the 7143LA20J functions exclusively as an active-low write-inhibit input - not an output. When asserted low by a MASTER device (e.g., IDT7133LA20J), it blocks write operations on the corresponding port. This enables hardware-controlled arbitration in width-expanded memory systems without external logic. The 7143LA20J contains no internal arbitration logic.
Does the 7143LA20J support battery backup operation?
Yes, the 7143LA20J supports battery backup operation with guaranteed data retention at VCC = 2.0 V. In this mode, typical data retention current is 100 µA (commercial) or up to 4 mA (industrial/military grades), allowing indefinite storage from a coin-cell source without refresh. This feature is exclusive to LA variants - SA versions do not support 2V retention.
Can the 7143LA20J be used as a standalone dual-port RAM without a MASTER device?
Yes, the 7143LA20J can operate as a standalone dual-port RAM. Its BUSY pins default to inactive (high) when unused, permitting full concurrent read/write access. However, contention detection and resolution require external logic or software coordination - unlike the IDT7133, the 7143LA20J lacks on-chip arbitration and does not assert BUSY on conflict.
What package options are available for the 7143LA20J?
The 7143LA20J is available in 68-pin PLCC (PLG68), 68-pin ceramic PGA (GU68), 68-pin flatpack (FP68), and 100-pin TQFP (PNG100). All variants share identical pinouts and electrical specifications. The PLCC version offers cost-effective reworkability; PGA and flatpack suit high-reliability military applications; TQFP provides higher I/O density for space-constrained PCBs.
How does the 7143LA20J differ from the IDT7133LA20J in system design?
The 7143LA20J is a SLAVE-only device: it accepts BUSY as an input and lacks on-chip arbitration logic, while the IDT7133LA20J is a MASTER with BUSY output and internal arbitration. In width-expansion systems, only one 7133LA20J drives BUSY signals to multiple 7143LA20J SLAVES - preventing "busy lock-out" and eliminating external glue logic. Their pin compatibility enables seamless board-level scaling.
7143LA20J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 68-LCC (J-Lead)
- Packaging:
- Tube
- 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:
- 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:
- 68-PLCC (24.21x24.21)
7143LA20J FAQ
1.How can I place an order for 7143LA20J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7143LA20J 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 7143LA20J reliable?
The price and inventory of 7143LA20J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7143LA20J is usually 5 days.
3.What payment methods are accepted for 7143LA20J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7143LA20J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7143LA20J?
7143LA20J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7143LA20J 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 7143LA20J?
For technical support, including 7143LA20J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7143LA20J requirements.
6.How does Aetrix verify that 7143LA20J is sourced from the original manufacturer or authorized distributors?
All 7143LA20J 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 7143LA20J meets industry standards.
7.What is the process for return or replacement of 7143LA20J?
All 7143LA20J units undergo pre-shipment inspection (PSI). If there is an issue with 7143LA20J, 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 7143LA20J part is unused and in its original packaging.
Return procedure for 7143LA20J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7143LA20J Tags
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AT24C02C-XHM-T
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