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Renesas 7143LA55GB
- Part No.:
- 7143LA55GB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-BPGA
- Datasheet:
-
7143LA55GB.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,864
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Product details
Overview
7143LA55GB from IDT is a low-power, 2K × 16-bit (4,096-word × 16-bit) asynchronous dual-port SRAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, with 55 ns maximum read cycle time, 2V data retention capability, and industrial temperature range (–40°C to +85°C), used in real-time interprocessor communication and military-grade avionics bus arbitration.
For engineers reviewing the 7143LA55GB datasheet, 7143LA55GB pinout, 7143LA55GB application, or 7143LA55GB equivalent, this page delivers verified timing parameters, BUSY input behavior, byte-select write control, power-down current specs, and package-validated pin mapping for 68-pin PLCC, PGA, and flatpack footprints - critical for deterministic contention resolution in dual-CPU architectures.
Technical Context
The 7143LA55GB operates fully asynchronously on both ports, with independent address, control, and bidirectional I/O buses (I/O0L–I/O15L and I/O0R–I/O15R). Its BUSY pin functions exclusively as an input - unlike the MASTER 7133 - enabling hardware write inhibition during port-to-port address contention without internal arbitration logic.
It supports separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), TTL-compatible 5V ±10% supply, and battery backup mode at VCC = 2V. The device enters ultra-low standby (1 µA typical) when both chip enables (CEL/CER) are high and inputs are CMOS-level stable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 16-bit (4,096 words × 16 bits); supports independent concurrent access per port |
| Access Time (tRC) | 55 ns max; defines minimum read cycle interval for guaranteed valid data at outputs |
| Supply Voltage | 5.0 V ±10%; single-rail operation compatible with legacy TTL logic families |
| Data Retention | 2 V minimum; retains stored data during brown-out or battery-backup mode |
| Standby Current (ISB3) | 0.2 µA typical; achieved when both CEL and CER > VCC − 0.2 V and all inputs static |
| Operating Temperature | −40°C to +85°C; qualified for industrial embedded systems requiring extended thermal stability |
| Input Capacitance | 11 pF max; ensures signal integrity up to ~100 MHz with standard PCB trace design |
Pinout & Package
7143LA55GB is available in 68-pin PLCC (PLG68), 68-pin ceramic PGA (GU68), and 68-pin flatpack (FP68) packages. All variants share identical pinout and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L / A0R–A10R | Address Inputs (Left/Right Port) | 11-bit address bus per port; selects one of 2K memory locations independently |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data I/O (Left/Right Port) | 16-bit parallel data path per port; high-impedance when CE or OE inactive |
| CEL / CER | Chip Enable (Left/Right Port) | Active-low enable; disables port logic and reduces current to ISB1/ISB3 levels when high |
| R/WLUB / R/WRUB R/WLLB / R/WRLB | Upper/Lower Byte Write Enable | Enables write to upper (I/O8–I/O15) or lower (I/O0–I/O7) byte independently per port |
| OEL / OER | Output Enable (Left/Right Port) | Active-low control of output drivers; allows read data to appear on I/O bus |
| BUSYL / BUSYR | BUSY Input (Left/Right Port) | Active-low write inhibit signal; gates internal write path when asserted (SLAVE-only function) |
| VCC (×2) / GND (×2) | Power & Ground | Dual VCC/GND pins ensure stable voltage distribution and reduce ground bounce in high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY interface | Eliminates need for external arbitration logic when paired with 7133 MASTER; BUSY acts solely as write-gate input |
| Byte-select write control | Enables partial-word writes (8-bit granularity) without read-modify-write cycles, reducing bus traffic and latency |
| 2V data retention | Preserves memory contents during main power loss using backup battery, critical for fault-tolerant systems |
| Ultra-low standby current | 0.2 µA typical (ISB3) enables multi-year battery life in always-on monitoring subsystems |
| Industrial temperature grade | Validated operation from –40°C to +85°C supports deployment in harsh environments without derating |
Applications
| Real-Time Interprocessor Communication | Military Avionics Bus Arbitration |
|---|---|
Use Scenario: Two independent CPUs share status, command, and telemetry data via shared memory without software locks or polling. IC Role / Device Role / Timing Role: SLAVE 7143LA55GB receives BUSY assertion from MASTER 7133 to prevent simultaneous writes to same address, ensuring deterministic data coherency. Use Value: Eliminates race conditions and software overhead; 55 ns access enables sub-200 ns round-trip message exchange between processors. |
Use Scenario: Flight control and navigation computers coordinate sensor fusion and actuator commands over a dual-redundant data bus. IC Role / Device Role / Timing Role: 7143LA55GB serves as synchronized buffer in width-expanded 32-bit RAM array, with BUSY input enforcing strict write sequencing across channels. Use Value: Prevents "Busy Lock-Out" failure mode; 2V retention maintains critical flight state during transient power interruption. |
| Industrial PLC Dual-Core Synchronization | Traffic Signal Controller Memory Expansion |
Use Scenario: Programmable logic controller uses dual ARM cores for safety-critical motion control and HMI rendering, sharing I/O state tables. IC Role / Device Role / Timing Role: 7143LA55GB operates as SLAVE in 32-bit-wide memory bank, accepting delayed write pulses gated by MASTER's BUSY response. Use Value: Enables deterministic worst-case latency under contention; 0.2 µA standby minimizes thermal load in sealed enclosures. |
Use Scenario: Intersection controller manages phase timing, vehicle detection, and emergency preemption using two synchronized microcontrollers. IC Role / Device Role / Timing Role: 7143LA55GB provides non-blocking read access while writes are stalled by BUSY, preventing signal timing violations during priority overrides. Use Value: Guarantees <100 ns response to emergency vehicle preemption requests; industrial temp rating ensures outdoor cabinet reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY7C1371D-55BGXI | 3.3V core, LVCMOS I/O; no BUSY arbitration; uses semaphore register instead of hardware BUSY pin | Requires firmware-based arbitration; unsuitable for hard real-time systems needing sub-55 ns deterministic response | Select only if migrating to 3.3V system and can implement software arbitration |
| IDT7133LA55GB | MASTER variant with open-drain BUSY output, on-chip arbitration logic, and identical speed/package | Used as primary arbitrator in same-width or width-expanded systems; cannot be substituted directly as SLAVE | Required when building MASTER/SLAVE pair; not interchangeable with 7143LA55GB due to BUSY direction and logic |
Compared with CY7C1371D-55BGXI and IDT7133LA55GB, the 7143LA55GB uniquely delivers hardware-enforced write inhibition via dedicated BUSY input - enabling zero-software-overhead, cycle-accurate contention resolution essential for MIL-STD-1553 and ARINC-429 interprocessor links.
Availability
7143LA55GB is available at Aetrix Electronics and suitable for real-time interprocessor communication, military avionics bus arbitration, and industrial PLC dual-core synchronization requiring stable component supply across extended product lifecycles.
Supply support for 7143LA55GB 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 7143LA55GB belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic, hardware-arbitrated memory sharing between independent processors in safety-critical and mission-reliability applications.
FAQ
What is the role of the BUSY pin on the 7143LA55GB?
The BUSY pin on the 7143LA55GB functions exclusively as an active-low input that gates internal write operations. When asserted, it prevents writes to the memory array regardless of R/W or CE state - a defining SLAVE behavior distinct from the MASTER 7133's open-drain BUSY output. This enables hardware-level write inhibition without software intervention, critical for deterministic contention resolution in dual-CPU systems. The 7143LA55GB does not generate BUSY signals.
Can the 7143LA55GB operate standalone without a MASTER device?
Yes, the 7143LA55GB can operate as a standalone dual-port SRAM when BUSYL and BUSYR are tied HIGH (via pull-up resistors), disabling write inhibition. In this configuration, both ports perform independent reads/writes with no arbitration - but simultaneous writes to the same address result in undefined data. It is functionally complete without a MASTER, though its BUSY input capability remains unused unless paired with a 7133-series MASTER.
What is the minimum VCC required to retain data in the 7143LA55GB?
The 7143LA55GB guarantees data retention down to VCC = 2.0 V, as specified in Table 8 of the datasheet. At this voltage, ICCDR is typically 100 µA (commercial) or up to 4 mA (military/industrial), allowing extended hold time on backup batteries. Operation below 2.0 V risks data loss; the device is not characterized for retention at 1.8 V or lower. This 2V threshold is a key differentiator of the LA (low-power) variant versus SA versions.
How does the 7143LA55GB handle simultaneous access to the same memory location?
The 7143LA55GB itself does not resolve simultaneous access - it relies on an external MASTER (e.g., 7133LA55GB) to assert BUSY and stall one port's write. When BUSY is low, the 7143LA55GB blocks the write pulse internally. If BUSY is not used (i.e., held HIGH), simultaneous writes produce indeterminate results. The device provides no on-chip arbitration; its design assumes coordinated use in MASTER/SLAVE topology to guarantee deterministic behavior.
Which packages are available for the 7143LA55GB?
The 7143LA55GB is offered in three pin-compatible 68-pin packages: PLCC (PLG68), ceramic PGA (GU68), and flatpack (FP68). All share identical pinout, timing, and DC characteristics. The part number suffix "GB" denotes the PLCC variant; "GA" and "GC" correspond to PGA and flatpack respectively. TQFP (100-pin) is not available for the LA55 speed grade - only SA variants support PNG100.
7143LA55GB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 68-BPGA
- 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:
- 55ns
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 68-PGA (29.46x29.46)
7143LA55GB FAQ
1.How can I place an order for 7143LA55GB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7143LA55GB 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 7143LA55GB reliable?
The price and inventory of 7143LA55GB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7143LA55GB is usually 5 days.
3.What payment methods are accepted for 7143LA55GB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7143LA55GB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7143LA55GB?
7143LA55GB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7143LA55GB 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 7143LA55GB?
For technical support, including 7143LA55GB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7143LA55GB requirements.
6.How does Aetrix verify that 7143LA55GB is sourced from the original manufacturer or authorized distributors?
All 7143LA55GB 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 7143LA55GB meets industry standards.
7.What is the process for return or replacement of 7143LA55GB?
All 7143LA55GB units undergo pre-shipment inspection (PSI). If there is an issue with 7143LA55GB, 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 7143LA55GB part is unused and in its original packaging.
Return procedure for 7143LA55GB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7143LA55GB Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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