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Renesas 7143LA35J8
- Part No.:
- 7143LA35J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7143LA35J8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,508
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Product details
Overview
7143LA35J8 from IDT is a 2K × 16-bit (32 Kbit), low-power dual-port static RAM with independent left/right asynchronous ports, 35 ns maximum access time, 1 mW typical standby power, and battery backup data retention at 2 V. It functions as a SLAVE device in MASTER/SLAVE width-expansion configurations for 32-bit+ memory systems, used in real-time embedded control where concurrent CPU/DSP access to shared memory is required.
For engineers reviewing the 7143LA35J8 datasheet, 7143LA35J8 pinout, 7143LA35J8 application, or 7143LA35J8 equivalent, this page delivers verified timing specs, BUSY input behavior, byte-select write control, industrial temperature support (–40°C to +85°C), and direct substitution guidance for dual-port SRAM selection in deterministic real-time systems.
Technical Context
The 7143LA35J8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port - no internal clock or synchronization logic. Its BUSY pin is strictly an input (unlike the MASTER 7133's open-drain output), enabling hardware write inhibition during contention without arbitration logic on-chip.
It supports independent upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), TTL-compatible 5 V ±10% supply, and automatic power-down via chip enable (CE). Data retention at 2 V is guaranteed for LA variants, with full standby current as low as 0.2 mA under CMOS-level inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 16-bit (32 Kbit) - supports 16-bit parallel data paths per port without external width expansion logic. |
| Access Time (max) | 35 ns - enables interface with 28 MHz bus systems (e.g., legacy DSPs, microcontrollers with ≤35 ns wait-state capability). |
| Supply Voltage | 5.0 V ±10% - single-rail operation compatible with standard TTL/CMOS logic families; no auxiliary supplies needed. |
| Standby Current (typ) | 1 mW (≈0.2 mA @ 5 V) - enables ultra-low-power hold mode during CPU sleep or system idle states. |
| Data Retention | 2 V minimum - allows battery backup using coin-cell sources (e.g., CR2032) without regulator, preserving contents during main power loss. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including motor drives, PLCs, and telecom line cards. |
| Package | 68-pin PLCC (PLG68) - surface-mount compatible with automated assembly; 0.95″ × 0.95″ footprint, JEDEC-standard pinout. |
Pinout & Package
7143LA35J8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC, code PLG68), with dual-row gull-wing leads, body size ≈ 0.95 in × 0.95 in × 0.17 in. Both VCC and GND pins must be connected for reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low port selection; controls power-down mode - high = standby (≤0.2 mA), low = active. |
| R/WLUB / R/WRUB | Upper Byte Write Enable (L/R) | Independent write gating for I/O8–I/O15; enables byte-level writes without disturbing lower byte. |
| R/WLLB / R/WRLB | Lower Byte Write Enable (L/R) | Independent write gating for I/O0–I/O7; critical for mixed-data-size transactions (e.g., 8-bit peripheral + 16-bit core). |
| OEL / OER | Output Enable (Left / Right) | Tri-states I/O bus when high; allows shared bus architectures with multiple masters. |
| BUSYL / BUSYR | Busy Input (Left / Right) | Input-only (SLAVE function); asserts write inhibit when driven low by MASTER's BUSY output during address contention. |
| A0L–A10L / A0R–A10R | Address Inputs (L/R) | 11-bit addressing per port → 2K depth; no internal address latching - fully combinatorial decode. |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data (L/R) | True dual-port I/O - simultaneous read/write possible if addresses differ; high-impedance when CE or OE inactive. |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY input | Eliminates need for external arbitration logic in width-expanded systems; accepts BUSY signal directly from MASTER 7133 to block writes during contention. |
| Byte-select write control | Enables atomic 8-bit updates in 16-bit memory space - essential for status registers, FIFO heads/tails, or mixed-precision buffers. |
| 2 V data retention | Supports maintenance-free battery backup using standard 2–3 V cells; retains data indefinitely at room temperature with <100 µA draw. |
| Asynchronous dual-port operation | No clock required - simplifies timing closure in heterogeneous systems (e.g., FPGA + DSP sharing memory without clock domain crossing logic). |
| Industrial temperature range | Validated operation from –40°C to +85°C - suitable for under-hood automotive ECUs, industrial HMIs, and outdoor base stations. |
Applications
| Real-Time Motor Control | Digital Signal Processing Buffer |
|---|---|
|
Use Scenario: Two processors (ARM Cortex-M7 and C2000 DSP) share sensor data and control commands in a servo drive, requiring zero-latency memory access. IC Role / Device Role / Timing Role: SLAVE 7143LA35J8 provides second 16-bit port in MASTER/SLAVE pair, accepting BUSY-driven write inhibition to prevent race conditions during position-loop updates. Use Value: Enables deterministic 35 ns read/write cycles with hardware-enforced mutual exclusion - eliminates software semaphores and associated latency jitter. |
Use Scenario: A radar signal processor streams ADC samples into memory while a host CPU reads processed FFT results, both accessing overlapping buffers. IC Role / Device Role / Timing Role: 7143LA35J8 serves as dual-port buffer between ADC DMA engine and CPU - left port for write, right port for read, with independent byte enables. Use Value: Eliminates FIFO bridging logic; supports concurrent 16-bit sample writes and 32-bit result reads via width expansion with 7133 MASTER. |
| Industrial PLC I/O Mapping | Avionics Health Monitoring |
|
Use Scenario: Programmable Logic Controller uses dual-port RAM to decouple scan-cycle execution (CPU) from real-time I/O update (ASIC), ensuring cycle consistency. IC Role / Device Role / Timing Role: 7143LA35J8 acts as SLAVE in 32-bit-wide memory bank; BUSY input prevents CPU overwrites during ASIC I/O capture bursts. Use Value: Guarantees atomic I/O image updates at 1 ms scan rates - no dropped or corrupted bits due to concurrent access. |
Use Scenario: Flight-critical health monitor logs sensor faults and telemetry in nonvolatile memory; main power may fail mid-write. IC Role / Device Role / Timing Role: 7143LA35J8 stores last-known-good state with 2 V battery backup; retains 32 Kbit of fault history across brownouts. Use Value: Meets DO-254/ED-80 retention requirements without external SRAM controller or EEPROM wear leveling. |
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 | 36-pin TSSOP, 2.5 V core, 166 MHz QDR interface - not pin-compatible; requires level-shifting and clock domain management. | Targeted at high-speed networking buffers, not asynchronous CPU/DSP sharing. | Select only if migrating to DDR/QDR architecture and redesigning PCB layout and firmware timing. |
| IDT7133LA35J8 | MASTER variant with on-chip arbitration logic and open-drain BUSY output; identical speed, package, and retention specs. | Used when standalone dual-port operation or single-chip arbitration is required - not for width expansion. | Choose IDT7133LA35J8 if building a single 16-bit port system; use 7143LA35J8 only in MASTER/SLAVE configurations. |
Compared with CY7C1335KV18 and IDT7133LA35J8, the 7143LA35J8 uniquely provides SLAVE-specific BUSY input behavior and byte-select write control in a drop-in PLCC package - making it irreplaceable for legacy industrial designs expanding data width beyond 16 bits without adding discrete logic.
Availability
7143LA35J8 is available at Aetrix Electronics and suitable for real-time motor control, digital signal processing buffers, and industrial PLC I/O mapping requiring stable component supply across extended product lifecycles.
Supply support for 7143LA35J8 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, and RF solutions, now part of Renesas Electronics.
The IDT7133/7143 family was designed for deterministic, low-latency shared memory in real-time embedded systems - specifically targeting applications where two independent processors or controllers require concurrent, conflict-free access to common data structures.
FAQ
What is the role of BUSY pins on the 7143LA35J8?
The BUSY pins (BUSYL and BUSYR) on the 7143LA35J8 are inputs only - unlike the MASTER 7133, which drives BUSY as an open-drain output. When asserted low by a connected MASTER device, they internally gate write signals to prevent data corruption during address contention. This makes the 7143LA35J8 ideal for SLAVE roles in width-expanded systems where arbitration is centralized.
Does the 7143LA35J8 support battery backup operation?
Yes, the 7143LA35J8 supports battery backup data retention at 2 V minimum supply voltage. In retention mode (CE high, VCC = 2 V), it draws ≤100 µA typical - sufficient for long-term storage using standard lithium coin cells. This feature is exclusive to LA (low-power) variants and is not available in SA versions.
Can the 7143LA35J8 operate as a standalone dual-port RAM without a MASTER device?
Yes, the 7143LA35J8 can operate standalone with both ports fully functional for independent reads/writes. However, its BUSY pins serve only as write-inhibit inputs - so hardware arbitration during address contention must be implemented externally or disabled entirely. For autonomous arbitration, the IDT7133LA35J8 MASTER is required.
What is the meaning of "J8" in the part number 7143LA35J8?
The "J8" suffix in 7143LA35J8 denotes the PLCC (Plastic Leaded Chip Carrier) package variant with 68 pins (PLG68). It is distinct from other packages like PGA (GU68), Flatpack (FP68), or TQFP (PNG100). All speed grades (e.g., 35 = 35 ns) and power types (LA = low-power) retain identical electrical behavior across J8-packaged units.
How does byte-select write control improve system design with the 7143LA35J8?
Byte-select write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB) let the 7143LA35J8 perform independent 8-bit writes to upper (I/O8–I/O15) or lower (I/O0–I/O7) bytes. This avoids read-modify-write sequences when updating status flags or mixed-precision data - reducing bus traffic, eliminating race windows, and simplifying firmware for peripherals with 8-bit register maps.
7143LA35J8 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:
- 35ns
- Access Time:
- 35 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)
7143LA35J8 FAQ
1.How can I place an order for 7143LA35J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7143LA35J8 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 7143LA35J8 reliable?
The price and inventory of 7143LA35J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7143LA35J8 is usually 5 days.
3.What payment methods are accepted for 7143LA35J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7143LA35J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7143LA35J8?
7143LA35J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7143LA35J8 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 7143LA35J8?
For technical support, including 7143LA35J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7143LA35J8 requirements.
6.How does Aetrix verify that 7143LA35J8 is sourced from the original manufacturer or authorized distributors?
All 7143LA35J8 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 7143LA35J8 meets industry standards.
7.What is the process for return or replacement of 7143LA35J8?
All 7143LA35J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7143LA35J8, 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 7143LA35J8 part is unused and in its original packaging.
Return procedure for 7143LA35J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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