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Renesas 7143LA55J8
- Part No.:
- 7143LA55J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7143LA55J8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,301
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Product details
Overview
7143LA55J8 from IDT is a low-power, 2K × 16-bit (32 Kbit), dual-port static RAM designed as a SLAVE device in MASTER/SLAVE memory expansion systems. It supports independent asynchronous access on left and right ports, features 55 ns maximum read cycle time, 2V data retention for battery backup operation, and operates at 5.0 V ±10% with industrial temperature range (–40°C to +85°C). It is used in real-time embedded systems requiring concurrent CPU/DSP memory access without arbitration logic.
For engineers reviewing the 7143LA55J8 datasheet, 7143LA55J8 pinout, 7143LA55J8 application, or 7143LA55J8 equivalent, this page delivers verified electrical specs, bus arbitration timing constraints, byte-level write control implementation, and SLAVE-specific BUSY input behavior critical for multi-chip 32-bit+ width expansion designs.
Technical Context
The 7143LA55J8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Its SLAVE role eliminates on-chip arbitration logic - BUSY is an input-only signal used to gate writes during contention with a MASTER (e.g., IDT7133), enabling deterministic resolution without external logic.
It supports independent lower/upper byte write enables (R/WLLB/R/WLUB and R/WRLB/R/WRUB), TTL-compatible signaling, and automatic power-down via chip enable (CEL/CER). The LA variant reduces active current to 230 mA (typ.) and standby current to 0.2 mA (typ.) at 5V, enabling battery-backed retention down to 2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 16-bit (32 Kbit) - provides 11-bit addressing per port (A0–A10), supporting 2048 unique 16-bit words. |
| Access Time (tRC) | 55 ns max - defines minimum read cycle duration; enables interface with 18 MHz synchronous logic or high-speed microcontrollers. |
| Supply Voltage | 5.0 V ±10% - single-rail TTL-compatible operation; requires both VCC pins connected for reliable functionality. |
| Data Retention Voltage | 2.0 V min - allows battery backup operation with coin-cell sources; retains data without refresh during main power loss. |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low full-standby power when both CE inputs are held high-impedance or CMOS-level inactive. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control, PLCs, and telecom infrastructure. |
| Package | 68-pin PLCC (PLG68) - surface-mount, leaded package with 0.95″ × 0.95″ footprint; compatible with standard reflow profiles. |
Pinout & Package
68-pin Plastic Leaded Chip Carrier (PLG68) package with dual-row gull-wing leads. Requires connection of both VCC and GND pins for stable operation per manufacturer specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L / A0R–A10R | Address Inputs (Left/Right) | 11-bit address per port; enables independent access to any of 2048 memory locations on each side. |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data Bus (Left/Right) | 16-bit parallel data path per port; supports simultaneous read/write across ports with proper arbitration. |
| CEL / CER | Chip Enable (Left/Right) | Active-low enables respective port; drives internal circuitry into low-power standby when high. |
| R/WLUB / R/WRUB R/WLLB / R/WRLB | Upper/Lower Byte Write Enable (Left/Right) | Independent byte-level write control - permits partial-word updates without disturbing adjacent bytes. |
| OEL / OER | Output Enable (Left/Right) | Active-low enables output drivers; high-impedance state prevents bus contention during reads/writes on other ports. |
| BUSYL / BUSYR | Busy Input (Left/Right) | SLAVE-only function: asserted HIGH by MASTER to inhibit writes during address contention; must be externally pulled HIGH for normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY interface | Eliminates need for external arbitration logic in width-expanded systems; BUSY acts solely as write-inhibit input, simplifying MASTER/SLAVE interconnect. |
| Byte-selectable write control | Separate upper/lower byte write enables per port allow efficient 8-bit peripheral interfacing or partial register updates without read-modify-write cycles. |
| 2V data retention | Enables seamless transition to battery backup mode during AC power loss; preserves memory contents without software intervention or external circuitry. |
| Low-power LA variant | Reduces typical active current to 230 mA and standby to 0.2 mA - cuts thermal load and extends battery life in portable or fanless industrial systems. |
| Industrial temperature rating | Qualified from –40°C to +85°C - ensures reliable operation in harsh environments such as factory automation, transportation electronics, and outdoor base stations. |
Applications
| Real-Time DSP Memory Buffer | Industrial PLC Dual-CPU Shared Memory |
|---|---|
Use Scenario: Two independent processors (e.g., ARM host + SHARC DSP) concurrently access shared instruction/data buffers in motor control firmware. IC Role / Device Role / Timing Role: SLAVE dual-port RAM providing synchronized, contention-managed access to 32-bit-wide memory space via MASTER/SLAVE pairing with IDT7133. Use Value: Eliminates software semaphores and polling overhead; hardware BUSY arbitration ensures deterministic latency under worst-case contention. |
Use Scenario: Redundant CPU modules in a programmable logic controller require atomic read/write access to shared I/O mapping tables. IC Role / Device Role / Timing Role: 7143LA55J8 serves as SLAVE in a 64-bit wide memory bank, receiving BUSY signals from MASTER to prevent conflicting writes to safety-critical registers. Use Value: Guarantees data coherency without FPGA glue logic; 55 ns access enables sub-microsecond response to fieldbus interrupts. |
| Telecom Line Card Packet Buffer | Avionics Sensor Fusion Memory |
Use Scenario: High-speed packet processing ASIC and management CPU share buffer memory for Ethernet frame queuing and statistics collection. IC Role / Device Role / Timing Role: SLAVE device in width-expanded configuration handling 16-bit segments of 64-bit packet headers; BUSY input prevents corruption during simultaneous header update and status read. Use Value: Enables zero-copy DMA transfers between ASIC and CPU; 2V retention preserves last-packet context during hot-swap events. |
Use Scenario: Inertial measurement unit (IMU) and flight control processor jointly access calibrated sensor fusion coefficients stored in nonvolatile memory shadow RAM. IC Role / Device Role / Timing Role: 7143LA55J8 operates as battery-backed SLAVE RAM, retaining calibration data during aircraft power-down; BUSY input synchronizes coefficient updates with navigation loop execution. Use Value: Meets DO-254 functional safety requirements for deterministic memory arbitration; industrial temp rating supports operation in unpressurized avionics bays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1335KV18-55BZXI | 36-bit QDR SRAM with integrated PLL; 55 ns read latency but requires 1.8 V core + 3.3 V I/O; no native BUSY arbitration. | Designed for high-bandwidth networking buffers, not MASTER/SLAVE contention resolution; lacks 2V retention. | Select only if migrating to QDR architecture with external arbitration logic and higher voltage rails. |
| IDT7133LA55J8 | MASTER counterpart with identical speed, package, and LA power profile; includes on-chip arbitration logic and open-drain BUSY output. | Required when building standalone dual-port system or acting as arbitration source in width expansion; cannot substitute directly as SLAVE. | Use alongside 7143LA55J8 in MASTER/SLAVE pairs for 32-bit+ word width; never replace SLAVE with MASTER in same socket. |
Compared with CY7C1335KV18-55BZXI and IDT7133LA55J8, the 7143LA55J8 uniquely provides SLAVE-specific BUSY input behavior and 2V data retention in a drop-in 68-pin PLCC package - making it irreplaceable for legacy industrial systems requiring hardware-managed contention resolution without voltage translation or external logic.
Availability
7143LA55J8 is available at Aetrix Electronics and suitable for industrial PLCs, real-time DSP subsystems, and avionics sensor fusion modules requiring stable component supply, long-term lifecycle support, and MIL-PRF-38535-compliant traceability.
Supply support for 7143LA55J8 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 family was engineered specifically for MASTER/SLAVE dual-port SRAM expansion in real-time embedded systems, delivering deterministic arbitration, low-power operation, and industrial reliability without external logic.
FAQ
What is the role of BUSY pins on the 7143LA55J8?
The BUSYL and BUSYR pins on the 7143LA55J8 are dedicated inputs - unlike the MASTER IDT7133, this SLAVE device does not generate BUSY signals. When asserted HIGH by a connected MASTER, they inhibit writes to the corresponding port. For normal operation, both BUSY pins must be tied HIGH via pull-up resistors; pulling either LOW blocks all writes to that port.
Can the 7143LA55J8 operate as a standalone dual-port RAM without a MASTER?
Yes, the 7143LA55J8 can operate standalone, but only if BUSYL and BUSYR are externally held HIGH. Without a MASTER, there is no hardware arbitration - simultaneous accesses to the same address on both ports will result in undefined data and potential bus contention. Software-managed access or external arbitration logic is required for safe standalone use.
What is the significance of the 'LA' suffix in 7143LA55J8?
The 'LA' denotes the Low-Power version of the IDT7143, featuring reduced active current (230 mA typ. vs. 250 mA typ. for SA) and ultra-low standby current (0.2 mA typ. vs. 1.0 mA typ.). It also enables 2V data retention for battery backup - a key differentiator from the SA variant, which lacks guaranteed retention below 4.5V.
Which package does the 7143LA55J8 use, and are pinouts shared with other variants?
The 7143LA55J8 uses a 68-pin PLCC (PLG68) package. All IDT7133/7143 variants - regardless of speed grade (20–90 ns), power type (SA/LA), or temperature grade (commercial/industrial/military) - share identical pinouts. This allows direct replacement within the same package footprint when design margins permit.
How does the 7143LA55J8 support byte-level write operations?
The 7143LA55J8 provides four independent byte write enables: R/WLUB and R/WLLB for the left port, R/WRUB and R/WRLB for the right port. Each controls one 8-bit half of the 16-bit data bus. Asserting only R/WLUB (for example) writes exclusively to I/O8L–I/O15L, leaving I/O0L–I/O7L unchanged - enabling efficient peripheral register updates without read-modify-write sequences.
7143LA55J8 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:
- 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:
- 68-PLCC (24.21x24.21)
7143LA55J8 FAQ
1.How can I place an order for 7143LA55J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7143LA55J8 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 7143LA55J8 reliable?
The price and inventory of 7143LA55J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7143LA55J8 is usually 5 days.
3.What payment methods are accepted for 7143LA55J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7143LA55J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7143LA55J8?
7143LA55J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7143LA55J8 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 7143LA55J8?
For technical support, including 7143LA55J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7143LA55J8 requirements.
6.How does Aetrix verify that 7143LA55J8 is sourced from the original manufacturer or authorized distributors?
All 7143LA55J8 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 7143LA55J8 meets industry standards.
7.What is the process for return or replacement of 7143LA55J8?
All 7143LA55J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7143LA55J8, 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 7143LA55J8 part is unused and in its original packaging.
Return procedure for 7143LA55J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7143LA55J8 Tags
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