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Renesas 7143SA25JI
- Part No.:
- 7143SA25JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7143SA25JI.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,124
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Product details
Overview
7143SA25JI from 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 access on left and right ports with 25 ns max read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables error-free 32-bit-or-wider word width systems without external logic.
For engineers reviewing the 7143SA25JI datasheet, 7143SA25JI pinout, 7143SA25JI application, or 7143SA25JI equivalent, this page delivers verified timing parameters, BUSY input behavior, byte-select write control, power-down modes, and validated alternatives for dual-port memory system design.
Technical Context
The 7143SA25JI operates as a SLAVE dual-port SRAM with BUSY input (not output), requiring external arbitration from a MASTER IDT7133. It supports fully asynchronous reads/writes on both ports, with separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB) and independent chip enables (CEL/CER).
Its internal architecture omits on-chip arbitration logic - unlike the IDT7133 - and relies entirely on externally driven BUSY signals to gate writes during contention. Data retention at 2V is supported only in LA variants; the SA variant (like 7143SA25JI) does not provide battery backup retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 16 (32,768 bits), organized as two independent 11-bit address spaces |
| Access Time | 25 ns max 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 | Industrial grade: –40°C to +85°C - qualified for embedded control and avionics subsystems |
| Power Consumption | Active current typ. 230 mA (both ports active); standby current typ. 25 mA (TTL-level CE high) |
| Bus Interface | Dual 16-bit bidirectional I/O ports (I/O0L–I/O15L and I/O0R–I/O15R), with separate address/control lines |
| BUSY Function | BUSYL/BUSYR are inputs only - used to inhibit writes during port contention; no internal arbitration logic |
Pinout & Package
7143SA25JI is packaged in a 68-pin PLCC (PLG68), with dual-port I/O, address, and control pins arranged symmetrically for left/right ports. 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 enable for respective port; controls power-down mode when high |
| R/WLUB / R/WRUB | Upper Byte Write Enable | Controls write to I/O8–I/O15 on left/right port independently |
| R/WLLB / R/WRLB | Lower Byte Write Enable | Controls write to I/O0–I/O7 on left/right port independently |
| OEL / OER | Output Enable | Tri-states I/O drivers when high; allows shared bus operation |
| BUSYL / BUSYR | BUSY Input | Write-inhibit signal - forces high-impedance I/O and blocks write if asserted |
| A0L–A10L / A0R–A10R | Address Inputs | 11-bit address per port (2K depth); fully asynchronous between ports |
| I/O0L–I/O15L / I/O0R–I/O15R | Data I/O | 16-bit bidirectional data bus per port; no internal direction control |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY interface | Eliminates need for external arbitration logic when paired with IDT7133 MASTER - simplifies 32-bit+ width expansion |
| Independent byte write control | Enables partial-word updates (upper/lower 8-bit bytes) without read-modify-write cycles |
| Asynchronous dual-port operation | Allows concurrent, unsynchronized access from two CPUs or DMA engines - no clock required |
| TTL-compatible signaling | Direct interfacing with legacy microcontrollers and FPGAs without level-shifting circuitry |
| Low-power standby mode | 25 mA typical standby current (TTL-level CE high) - suitable for intermittently active embedded systems |
Applications
| Real-Time Industrial PLC | Aerospace Avionics Data Buffer |
|---|---|
Use Scenario: Dual-CPU communication buffer in programmable logic controller, where one CPU handles I/O scanning and the other runs control algorithms. IC Role / Device Role / Timing Role: SLAVE dual-port RAM synchronizing real-time data exchange between isolated processing domains. Use Value: 25 ns access ensures sub-microsecond inter-processor handshaking, eliminating software polling delays. |
Use Scenario: Shared memory between flight management computer (FMC) and display processing unit (DPU) in cockpit display systems. IC Role / Device Role / Timing Role: SLAVE memory enabling deterministic, contention-free data transfer under DO-254 safety constraints. Use Value: BUSY-input-only architecture prevents race conditions during simultaneous read/write attempts across safety-critical partitions. |
| Military Radar Signal Processing | Medical Imaging Frame Buffer |
Use Scenario: Width-expanded 64-bit memory subsystem feeding ADC/DAC interfaces in phased-array radar front-end. IC Role / Device Role / Timing Role: SLAVE device in multi-chip 7133/7143 array delivering synchronized sample buffering with hardware arbitration. Use Value: 68-pin PLCC package supports ruggedized PCB layouts; industrial temp rating ensures reliability in vehicle-mounted systems. |
Use Scenario: Dual-port frame buffer between image acquisition FPGA and display controller in ultrasound or MRI systems. IC Role / Device Role / Timing Role: SLAVE RAM providing zero-latency pixel data handoff while avoiding bus contention during real-time rendering. Use Value: Independent byte write enables selective update of metadata headers without disturbing active video frames. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7133SA25JI | MASTER device with on-chip arbitration logic and open-drain BUSY output; includes port-to-port timing specs (tBAA, tBDD) | Required when hardware arbitration and BUSY generation are needed - cannot substitute directly as SLAVE | Select only when building MASTER/SLAVE pair; not interchangeable with 7143SA25JI in SLAVE role |
| CY7C133-25JC | 2K × 16 dual-port SRAM with identical 25 ns speed and 68-pin PLCC, but features bidirectional BUSY (input/output) and no MASTER/SLAVE distinction | Supports peer-to-peer arbitration without dedicated MASTER; lacks guaranteed BUSY propagation delay specs for width expansion | Use when simpler two-device arbitration suffices and IDT's MASTER/SLAVE timing guarantees are not required |
Compared with IDT7133SA25JI and CY7C133-25JC, the 7143SA25JI provides strictly defined SLAVE behavior - eliminating arbitration logic overhead and enabling predictable timing in width-expanded systems, but requiring a companion MASTER for contention resolution.
Availability
7143SA25JI is available at Aetrix Electronics and suitable for real-time industrial PLCs, aerospace avionics data buffers, and military radar signal processing systems requiring stable component supply, long-lifecycle support, and MIL-qualified temperature performance.
Supply support for 7143SA25JI 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 sensor solutions, now part of Renesas Electronics.
The IDT7133/7143 family was designed specifically for high-reliability dual-processor and real-time embedded systems requiring deterministic, contention-free memory sharing - with strict separation of MASTER arbitration and SLAVE scalability roles.
FAQ
What is the function of BUSYL and BUSYR on the 7143SA25JI?
On the 7143SA25JI, BUSYL and BUSYR serve exclusively as write-inhibit inputs - not outputs. When asserted low, they block write operations on the corresponding port and force I/O pins into high-impedance state. This behavior is fundamental to its SLAVE role in MASTER/SLAVE configurations with IDT7133 devices. The 7143SA25JI contains no internal arbitration logic; BUSY signals must be driven externally, typically by a MASTER IDT7133.
Can the 7143SA25JI operate as a standalone dual-port RAM without a MASTER device?
Yes, the 7143SA25JI can operate standalone, but BUSY functionality must be managed externally. Since BUSYL/BUSYR are inputs only, they must be tied HIGH (via pull-up resistors) to enable normal read/write operation. In standalone use, contention detection and resolution require external logic or software coordination - unlike the IDT7133, the 7143SA25JI provides no built-in arbitration.
Does the 7143SA25JI support battery backup data retention?
No, the 7143SA25JI does not support battery backup data retention. That feature is exclusive to the LA variant (e.g., 7143LA25JI), which specifies 2V data retention capability and lower standby current (1 µA typ.). The "SA" suffix denotes standard power consumption (1150 mW active typ.), and the 7143SA25JI datasheet contains no data retention specifications - confirming it is not rated for low-voltage holdover.
What package types are available for the 7143SA25JI?
The 7143SA25JI is offered in 68-pin PLCC (PLG68), 68-pin ceramic PGA (GU68), 68-pin flatpack (FP68), and 100-pin TQFP (PNG100). The J-suffix in 7143SA25JI indicates the industrial temperature grade (–40°C to +85°C) and is compatible with all four packages. Pinouts are identical across packages, enabling footprint flexibility without redesign.
How does write enable differ between upper and lower bytes on the 7143SA25JI?
The 7143SA25JI provides independent write enable control for upper and lower bytes on each port: R/WLUB and R/WLLB govern writes to I/O8–I/O15 and I/O0–I/O7 on the left port; R/WRUB and R/WRLB do the same for the right port. This allows atomic 8-bit updates without disturbing adjacent bytes - critical for status register manipulation or protocol header editing in real-time systems using the 7143SA25JI.
7143SA25JI 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:
- 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)
7143SA25JI FAQ
1.How can I place an order for 7143SA25JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7143SA25JI 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 7143SA25JI reliable?
The price and inventory of 7143SA25JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7143SA25JI is usually 5 days.
3.What payment methods are accepted for 7143SA25JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7143SA25JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7143SA25JI?
7143SA25JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7143SA25JI 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 7143SA25JI?
For technical support, including 7143SA25JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7143SA25JI requirements.
6.How does Aetrix verify that 7143SA25JI is sourced from the original manufacturer or authorized distributors?
All 7143SA25JI 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 7143SA25JI meets industry standards.
7.What is the process for return or replacement of 7143SA25JI?
All 7143SA25JI units undergo pre-shipment inspection (PSI). If there is an issue with 7143SA25JI, 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 7143SA25JI part is unused and in its original packaging.
Return procedure for 7143SA25JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7143SA25JI 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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