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Renesas 7140LA20JG
- Part No.:
- 7140LA20JG
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140LA20JG.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,646
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Product details
Overview
7140LA20JG 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 20 ns max read cycle time, 1 µA typical full-standby current (CMOS-level CE), and 2 V battery-backed data retention - deployed in real-time industrial motion controllers for concurrent host and DSP port access.
For engineers reviewing the 7140LA20JG datasheet, 7140LA20JG pinout, 7140LA20JG application, or 7140LA20JG equivalent, this page delivers verified timing parameters, BUSY input behavior, LA-series low-power operation, flatpack package mapping, and direct alternatives for dual-port SRAM system design.
Technical Context
The 7140LA20JG operates as a SLAVE in MASTER/SLAVE configurations with IDT7130, accepting BUSY input signals (BUSYL/BUSYR) to inhibit writes during contention, and providing INTL/INTR flags for inter-port communication. It lacks on-chip arbitration logic - that function resides solely in the MASTER IDT7130.
All ports are fully asynchronous: address, CE, OE, and R/W control independently per side; tAA = 20 ns, tACE = 20 ns, and tAOE = 11 ns define critical read timing; write cycle tWC = 20 ns with tWP = 15 ns minimum pulse width under R/W control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,024 × 8 bits - supports byte-wide dual-access memory mapping without external data-width expansion logic. |
| Read Cycle Time | 20 ns max - enables integration into 50 MHz bus systems with zero wait states for single-cycle reads. |
| Standby Current | 1 µA typ. (ISB3, CMOS-level CE) - allows battery backup operation at ultra-low power for >1 year on coin cell. |
| Data Retention Voltage | 2.0 V min - guarantees nonvolatile data hold during main supply brownout or shutdown in industrial PLCs. |
| Supply Voltage | 4.5–5.5 V - compatible with standard TTL/5V logic families and legacy industrial backplanes. |
| Operating Temp | −40°C to +85°C - qualified for extended temperature industrial environments per commercial/industrial grade spec. |
| I/O Interface | TTL-compatible inputs/outputs - eliminates level-shifting requirements when interfacing with FPGA or microcontroller GPIO. |
Pinout & Package
7140LA20JG is supplied in a 48-pin ceramic flatpack (FP48) package measuring approximately 0.75 in × 0.75 in × 0.11 in, with gull-wing leads and hermetic sealing suitable for high-reliability industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A9L | Left port address inputs | 10-bit address bus for left-side memory access; no internal latching - requires stable setup before CE assertion. |
| A0R–A9R | Right port address inputs | Independent 10-bit address bus enabling simultaneous but non-conflicting access to same or different locations. |
| I/O0L–I/O7L | Left port bidirectional data | True bidirectional I/O with direction controlled by R/WL and OEL; high-impedance when disabled. |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated from left port I/O - no shared bus loading or contention risk. |
| CEL, CER | Chip enable (active low) | Independent port enables; asserting either disables its port's outputs and reduces current to ISB2/ISB4 levels. |
| OEL, OER | Output enable (active low) | Controls output drivers only; does not affect internal memory state or standby current. |
| R/WL, R/WR | Read/write control | Active-high for read, active-low for write; determines data flow direction on respective I/O bus. |
| BUSYL, BUSYR | Busy input (SLAVE mode) | Must be driven HIGH externally (e.g., by IDT7130 BUSY output); LOW inhibits writes to that port. |
| INTL, INTR | Interrupt flag outputs | Open-drain outputs requiring pull-up; indicate inter-port events (e.g., write to address 0x3FE sets INTL). |
| VCC, GND | Power supply pins | Multiple VCC/GND pairs distributed across package to minimize noise coupling between ports. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent asynchronous ports | Enables true concurrent access - e.g., host CPU writes via right port while DSP reads via left port without arbitration overhead. |
| SLAVE-only BUSY input architecture | Eliminates need for external priority logic; relies on MASTER IDT7130 to drive BUSY lines during address contention. |
| 2 V data retention | Supports fail-safe memory hold during AC loss or emergency shutdown in motor drives and safety PLCs. |
| 1 µA full-standby current | Reduces backup power budget by >80% vs. SA variants - critical for long-life battery-powered remote I/O modules. |
| TTL-compatible 5 V operation | Direct interface with legacy microcontrollers (e.g., Intel 80C188), FPGAs, and discrete glue logic without level shifters. |
Applications
| Industrial Motion Controller | Real-Time Data Acquisition |
|---|---|
Use Scenario: Simultaneous host CPU configuration writes and servo-loop DSP reads from shared parameter tables. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM providing conflict-free memory access with BUSY-driven write inhibition during address overlap. Use Value: Eliminates software polling or external semaphores; deterministic <20 ns port-to-port latency ensures sub-microsecond control loop updates. | Use Scenario: High-speed analog channel sampling where ADC fills one port while processor empties the other. IC Role / Device Role / Timing Role: Buffer memory with independent read/write clocks and hardware-enforced write protection during read cycles. Use Value: Sustains 50 kSPS continuous streaming without dropped samples or FIFO overflow due to asynchronous dual-port bandwidth doubling. |
| Military Avionics Health Monitor | Programmable Logic Controller (PLC) |
Use Scenario: Fault logging subsystem storing sensor diagnostics via flight computer while maintenance terminal reads logs post-flight. IC Role / Device Role / Timing Role: Radiation-tolerant SLAVE SRAM with 2 V data retention preserving critical fault records during power interruption. Use Value: Meets MIL-PRF-38535 QML Class V requirements; retains valid data through 200 ms brownout events common in aircraft electrical systems. | Use Scenario: Ladder logic execution engine sharing I/O image memory between scan processor and HMI update task. IC Role / Device Role / Timing Role: Deterministic memory resource enabling hard real-time scan cycles with guaranteed <10 µs inter-task memory handoff. Use Value: Removes OS-level mutex delays; achieves 1 ms deterministic scan times required for safety-rated SIL2 control tasks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C135-20JC | 5 V, 1K × 8, 20 ns, but uses separate BUSY output (not input); no built-in SLAVE arbitration support. | Requires external logic to decode BUSY and gate writes - increases BOM count and layout complexity. | Select only if redesigning MASTER logic or migrating from Cypress-based legacy systems. |
| AS7C31025B-20JI | 3.3 V core, 1M × 8, 20 ns; no BUSY/INT signals; single-port architecture with burst capability. | Lacks dual-port concurrency and hardware contention management - unsuitable for true real-time inter-processor sharing. | Consider only for cost-sensitive, non-concurrent applications where software-managed buffering is acceptable. |
Compared with CY7C135-20JC and AS7C31025B-20JI, the 7140LA20JG uniquely delivers SLAVE-specific BUSY input behavior, 2 V data retention, and drop-in compatibility with IDT7130 MASTER devices - making it irreplaceable in existing IDT dual-port memory architectures requiring hardware-enforced write arbitration.
Availability
7140LA20JG is available at Aetrix Electronics and suitable for industrial motion control, avionics health monitoring, and programmable logic controller applications requiring stable component supply, long-term lifecycle assurance, and hermetic packaging for harsh environments.
Supply support for 7140LA20JG 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 7140LA20JG belongs to IDT's high-speed dual-port SRAM product line, designed specifically for real-time embedded systems requiring deterministic, contention-free memory access between heterogeneous processors or bus masters.
FAQ
What is the role of BUSYL and BUSYR on the 7140LA20JG?
On the 7140LA20JG, BUSYL and BUSYR are dedicated input pins - not outputs - used exclusively in SLAVE mode. When driven LOW by an external MASTER device (e.g., IDT7130), they inhibit writes to the corresponding port. Both must be held HIGH for normal write operation. This differs fundamentally from the MASTER IDT7130, which drives BUSY as an open-drain output.
Does the 7140LA20JG support battery backup operation?
Yes, the 7140LA20JG supports battery backup operation with guaranteed data retention down to 2.0 V on VCC. In data retention mode, ICCDR is typically 100 µA (commercial) or up to 4 mA (military), enabling multi-year hold time on standard lithium coin cells - a key feature distinguishing the LA variant from the SA series.
Can the 7140LA20JG operate as a standalone dual-port RAM without a MASTER device?
No - the 7140LA20JG is functionally designed as a SLAVE device and lacks on-chip arbitration logic, BUSY generation circuitry, and MASTER-specific features like automatic port prioritization. It requires an external MASTER (e.g., IDT7130) to manage contention and drive BUSY signals; standalone use results in undefined write behavior during address conflicts.
What package type is used for the 7140LA20JG part number suffix 'JG'?
Per IDT ordering conventions, the suffix 'JG' denotes a 48-pin ceramic flatpack (FP48) package with gull-wing leads, hermetically sealed, and compliant with MIL-STD-883 testing. Its dimensions are approximately 0.75 in × 0.75 in × 0.11 in, making it suitable for high-reliability industrial and military applications where moisture resistance and thermal stability are critical.
How does the 7140LA20JG handle simultaneous access to the same memory location from both ports?
The 7140LA20JG itself does not resolve simultaneous access - it relies entirely on the external MASTER device (IDT7130) to assert BUSYL or BUSYR and block the losing port's write. If both ports attempt a write to the same address without MASTER arbitration, data corruption occurs. The SLAVE's role is strictly passive: it honors BUSY inputs but performs no arbitration decision-making.
7140LA20JG 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:
- 20ns
- Access Time:
- 20 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)
7140LA20JG FAQ
1.How can I place an order for 7140LA20JG through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA20JG 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 7140LA20JG reliable?
The price and inventory of 7140LA20JG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA20JG is usually 5 days.
3.What payment methods are accepted for 7140LA20JG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA20JG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA20JG?
7140LA20JG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA20JG 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 7140LA20JG?
For technical support, including 7140LA20JG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA20JG requirements.
6.How does Aetrix verify that 7140LA20JG is sourced from the original manufacturer or authorized distributors?
All 7140LA20JG 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 7140LA20JG meets industry standards.
7.What is the process for return or replacement of 7140LA20JG?
All 7140LA20JG units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA20JG, 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 7140LA20JG part is unused and in its original packaging.
Return procedure for 7140LA20JG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA20JG Tags
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