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Renesas 7140SA100J
- Part No.:
- 7140SA100J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140SA100J.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,821
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Product details
Overview
7140SA100J from IDT is a 1K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting fully asynchronous left/right port access with 100 ns max read/write cycle time, 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables error-free 16-bit-or-wider memory systems without external logic when paired with IDT7130 MASTER.
For engineers reviewing the 7140SA100J datasheet, 7140SA100J pinout, 7140SA100J application, or 7140SA100J equivalent, key selection considerations include BUSY input behavior (not output), absence of on-chip arbitration logic, TTL-compatible I/O, and compatibility with IDT7130-based dual-port architectures requiring port-to-port contention management.
Technical Context
The 7140SA100J operates as a SLAVE dual-port SRAM with dedicated left (L) and right (R) ports, each featuring independent address (A0–A9), data (I/O0–I/O7), and control lines (CEL/CER, OEL/OER, R/WL/R/WR). BUSYL and BUSYR are inputs-not outputs-used to inhibit writes during contention, unlike the MASTER IDT7130 which drives BUSY signals.
It supports full asynchronous operation: reads and writes may occur simultaneously on both ports, with BUSY-driven arbitration ensuring data integrity during address collisions. The device lacks internal arbitration logic and relies entirely on external BUSY signaling from a MASTER device (e.g., IDT7130) to manage port conflicts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8 bits); provides compact dual-access buffer for real-time inter-processor communication. |
| Access Time | 100 ns maximum read/write cycle time; ensures deterministic latency in hard real-time embedded control loops. |
| Supply Voltage | 5.0 V ±10%; compatible with legacy TTL and 5 V microcontroller buses without level-shifting. |
| Operating Temperature | –40°C to +85°C industrial grade; validated for deployment in motor drives and industrial PLCs. |
| Power Consumption | Active current ≤110 mA (typ.), standby current ≤20 mA (ISB1, TTL-level CE high); suitable for low-duty-cycle monitoring nodes. |
| Port Interface | Fully independent left/right ports with separate CE, OE, R/W, address, and I/O; enables true concurrent CPU/DSP or host/peripheral access. |
| BUSY Role | BUSYL and BUSYR are inputs only; must be driven by external MASTER (e.g., IDT7130) to block writes during address contention. |
Pinout & Package
7140SA100J is available in 48-pin DIP (PDG48/SB48), 48-pin LCC (LC48), 48-pin ceramic flatpack (FP48), 52-pin PLCC (PLG52), and 64-pin STQFP/TQFP (PPG64/PNG64) packages. Pin functions are identical across all variants per datasheet revision Jul.12.21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A9L | Left port address inputs | 10-bit address bus for left-side memory access; latched on CE or R/W transition per timing spec. |
| A0R–A9R | Right port address inputs | 10-bit address bus for right-side access; fully independent from left port addressing. |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit TTL-compatible data path; direction controlled by R/WL and OEL; high-impedance when disabled. |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit TTL-compatible data path; independent of left port; no shared bus contention. |
| CEL, CER | Chip enable inputs | Active-low enables for respective ports; assertion initiates access; controls power-down mode when high. |
| OEL, OER | Output enable inputs | Active-low controls output drivers on respective ports; allows read-only or high-Z states independent of CE. |
| R/WL, R/WR | Read/write direction inputs | Active-high = read, active-low = write; determines data flow direction per port. |
| BUSYL, BUSYR | Busy inputs | Active-low signals from MASTER device (e.g., IDT7130); inhibit writes when asserted; no internal generation. |
| INTL, INTR | Interrupt flag outputs | Open-drain outputs indicating port-to-port interrupt events; require external pull-up resistors. |
| VCC, GND | Power supply pins | Single 5 V supply; all VCC and GND pins must be connected per datasheet Note 1 & 2. |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only dual-port architecture | Eliminates need for external arbitration logic when used with IDT7130 MASTER, reducing BOM count and PCB area in 16-bit+ memory expansions. |
| 100 ns max access time | Meets timing requirements for 10 MHz synchronous bus interfaces and real-time DSP co-processing applications. |
| TTL-compatible I/O | Direct interface with legacy 5 V microcontrollers (e.g., 8051, PIC18), FPGAs, and ASICs without level translation. |
| Industrial temperature range | Validated operation from –40°C to +85°C supports deployment in factory automation, motor control, and outdoor telecom equipment. |
| Low-power standby modes | ISB1 ≤20 mA (TTL CE high) and ISB3 ≤1.0 mA (CMOS CE high) enable energy-efficient sleep states in battery-backed systems. |
Applications
| Real-Time Inter-Processor Communication | Digital Signal Processing Buffer |
|---|---|
Use Scenario: Two independent processors (e.g., ARM Cortex-M7 and TI C67x DSP) exchange sensor fusion data via shared memory without software handshaking. IC Role / Device Role / Timing Role: 7140SA100J serves as SLAVE port in MASTER/SLAVE pair with IDT7130, providing deterministic 100 ns access for synchronized frame transfers. Use Value: Eliminates semaphore overhead and guarantees atomic read-modify-write cycles during address collisions via hardware BUSY arbitration. | Use Scenario: A radar signal processor streams ADC samples into memory while a second core performs FFT computation on prior frames. IC Role / Device Role / Timing Role: 7140SA100J acts as dual-access FIFO buffer; left port accepts streaming data, right port feeds FFT engine with zero wait-state reads. Use Value: Full 100 ns asynchronous access enables sustained 10 MB/s throughput without pipeline stalls or DMA bottlenecks. |
| Industrial PLC I/O Mapping | Military Avionics Data Exchange |
Use Scenario: Programmable logic controller uses dual-port RAM to isolate real-time I/O scan logic from HMI update tasks running on separate CPU cores. IC Role / Device Role / Timing Role: 7140SA100J provides isolated memory space for input image (left port) and output image (right port), updated at different rates. Use Value: Hardware-enforced BUSY signaling prevents corrupted writes during simultaneous I/O scan and diagnostics execution. | Use Scenario: Flight control computer exchanges telemetry and command data between safety-critical and non-critical partitions under DO-254 compliance. IC Role / Device Role / Timing Role: 7140SA100J implements partitioned memory with strict temporal isolation; left port for certified firmware, right for maintenance interface. Use Value: Deterministic 100 ns access and industrial-grade reliability meet RTCA DO-254 timing assurance requirements for Level A hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C024AV-100AXC | 1K × 16 configuration, 100 ns access, 3.3 V supply; includes on-chip arbitration and BUSY output. | Requires voltage translation for 5 V systems; supports standalone dual-port use without MASTER pairing. | Select when migrating to 3.3 V designs or needing self-contained arbitration without IDT7130 dependency. |
| IDT7132SA100J | 2K × 8 size, same 100 ns speed and 5 V supply; SLAVE device with identical BUSY-input behavior and pinout compatibility. | Provides double memory depth for larger buffer requirements; drop-in replacement where board layout accommodates same footprint. | Select when 2K depth is required and existing 48-pin DIP/LCC layout permits mechanical fit. |
Compared with CY7C024AV-100AXC and IDT7132SA100J, the 7140SA100J offers optimal cost and simplicity for established IDT7130-based 1K × 8 expansions, retains full 5 V compatibility, and avoids redesign when BUSY signaling is already implemented via MASTER.
Availability
7140SA100J is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, and real-time DSP subsystems requiring stable component supply across extended production lifecycles.
Supply support for 7140SA100J 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 IDT7130/7140 family was designed specifically for high-reliability dual-processor and real-time embedded systems requiring deterministic memory access, hardware arbitration, and seamless 5 V integration.
FAQ
What is the function of BUSYL and BUSYR on the 7140SA100J?
BUSYL and BUSYR are active-low input signals on the 7140SA100J - not outputs. They must be driven by an external MASTER device (e.g., IDT7130) to inhibit writes during address contention. When asserted (LOW), the 7140SA100J blocks write operations on the corresponding port, ensuring data integrity without software intervention. This differs fundamentally from the IDT7130, which generates BUSY signals.
Can the 7140SA100J operate as a standalone dual-port RAM without a MASTER device?
No. The 7140SA100J is a SLAVE-only device and lacks on-chip arbitration logic or BUSY output capability. It requires pairing with an IDT7130 MASTER to resolve port contention. Attempting standalone use results in undefined write behavior during simultaneous access - the 7140SA100J will not assert BUSY, nor arbitrate; it relies entirely on externally supplied BUSY signals to gate writes.
What package options are available for the 7140SA100J?
The 7140SA100J is offered in multiple industry-standard packages: 48-pin plastic or sidebraze DIP (PDG48/SB48), 48-pin LCC (LC48), 48-pin ceramic flatpack (FP48), 52-pin PLCC (PLG52), and 64-pin STQFP/TQFP (PPG64/PNG64). All share identical pin functions and timing per datasheet Rev. Jul.12.21, enabling layout flexibility across prototyping and production platforms.
Does the 7140SA100J support battery backup or data retention mode?
No. Battery backup and 2 V data retention are exclusive to the LA suffix variants (e.g., 7140LA100J). The 7140SA100J is the standard-power version with active current ~110 mA (typ.) and no low-voltage retention capability. For battery-backed operation, the 7140LA100J must be selected instead - it is not a drop-in replacement due to differing power characteristics and qualification.
How does interrupt handling work on the 7140SA100J?
The 7140SA100J provides open-drain INTL and INTR outputs that signal port-to-port interrupt events. Writing to specific addresses (e.g., 3FFH on left port sets INTR; 3FEH on right port sets INTL) triggers the corresponding flag. These outputs require external pull-up resistors and are cleared by writing to complementary addresses. Interrupt timing is specified with tINS ≤25 ns (max) for the 100 ns speed grade, enabling fast inter-processor notification.
7140SA100J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 8Kbit
- Memory Organization:
- 1K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 100ns
- Access Time:
- 100 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
7140SA100J FAQ
1.How can I place an order for 7140SA100J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA100J 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 7140SA100J reliable?
The price and inventory of 7140SA100J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA100J is usually 5 days.
3.What payment methods are accepted for 7140SA100J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA100J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA100J?
7140SA100J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA100J 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 7140SA100J?
For technical support, including 7140SA100J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA100J requirements.
6.How does Aetrix verify that 7140SA100J is sourced from the original manufacturer or authorized distributors?
All 7140SA100J 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 7140SA100J meets industry standards.
7.What is the process for return or replacement of 7140SA100J?
All 7140SA100J units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA100J, 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 7140SA100J part is unused and in its original packaging.
Return procedure for 7140SA100J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140SA100J Tags
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