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Renesas 7140LA55J
- Part No.:
- 7140LA55J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140LA55J.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,146
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Product details
Overview
7140LA55J 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 55 ns max read cycle time, 2V data retention capability, and TTL-compatible 5V ±10% operation - used in real-time DSP co-processing and military-grade avionics inter-processor communication.
For engineers reviewing the 7140LA55J datasheet, 7140LA55J pinout, 7140LA55J application, or 7140LA55J equivalent, this page delivers verified timing parameters, BUSY input behavior, battery backup operation limits, and industrial temperature range (–40°C to +85°C) compliance for deterministic dual-port memory integration.
Technical Context
The 7140LA55J implements independent left/right address/data/control paths with no internal arbitration logic - unlike the MASTER IDT7130, it relies on external BUSY signaling for contention resolution. Its BUSYL and BUSYR pins are dedicated inputs that inhibit writes when asserted low, enabling deterministic port-to-port synchronization in shared-memory architectures.
It supports two distinct power modes: active operation at 550 mW typical (5V, both ports active), and full standby at ≤10 µA (CMOS-level CE high), with guaranteed 2V data retention during battery backup. All I/Os are TTL-compatible with VIH ≥ 2.2 V and VIL ≤ 0.8 V under 5V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,024 × 8 bits - provides byte-wide dual-access storage without external data bus widening logic |
| Access Time | 55 ns max tRC - enables synchronous interfacing with 18 MHz microcontrollers or DSPs |
| Data Retention | 2.0 V min VCC - supports battery-backed operation during main power loss in mission-critical systems |
| Operating Temp | –40°C to +85°C - qualified for industrial embedded control and aerospace subsystems |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5V logic rails and tolerant of ±10% regulation variance |
| Standby Current | ≤10 µA (ISB3, CMOS CE high) - enables ultra-low-power hold mode in portable or remote-sensor applications |
| I/O Interface | TTL-compatible - eliminates level-shifting requirements when interfacing with legacy 5V microcontrollers |
Pinout & Package
7140LA55J is available in 48-pin ceramic flatpack (FP48) and 48-pin plastic DIP (PDG48/SB48) packages. Pin functions are identical across these variants per IDT documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Two dedicated pins (1, 24) require low-inductance connection to system ground plane |
| VCC | Power supply | Two dedicated pins (23, 48) must be decoupled with 0.1 µF ceramic capacitors near each pin |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls ISB1/ISB2 standby current states |
| OEL / OER | Output enable (left/right) | Active-low enables I/O drivers; high-Z state reduces bus loading during multiplexed access |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of data flow on I/O0–I/O7 lines |
| BUSYL / BUSYR | Arbitration input (left/right) | SLAVE-only inputs - low assertion blocks writes to corresponding port during contention |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs - require external pull-up; signal cross-port event completion or address match |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit addressing per port - supports full 1K memory map independently on each side |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit buses - share same physical pins for read and write operations per port |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only architecture | Eliminates need for external arbitration logic when paired with IDT7130 MASTER - reduces BOM count and PCB area |
| 2V data retention | Enables seamless transition to battery backup during main power failure - critical for flight data recorders and black-box systems |
| Asynchronous dual-port operation | Allows independent read/write cycles on left and right ports with no clock synchronization required - ideal for real-time inter-processor messaging |
| Industrial temperature rating | Validated operation from –40°C to +85°C - suitable for under-hood automotive ECUs and outdoor telecom base stations |
| TTL-compatible I/O | Direct interface with legacy 5V microcontrollers (e.g., Intel 80C188, Motorola 68HC11) without level translators |
Applications
| Avionics Data Buffering | DSP Co-Processor Memory |
|---|---|
Use Scenario: Real-time exchange of sensor fusion data between flight management computer (FMC) and inertial navigation unit (INU). IC Role / Device Role / Timing Role: SLAVE dual-port SRAM providing non-blocking memory access for time-critical telemetry updates and command acknowledgments. Use Value: 55 ns tRC ensures sub-60 ns latency for cross-processor reads/writes, meeting DO-254 deterministic timing budgets. | Use Scenario: Shared instruction/data memory between TI C6000 DSP and ARM host processor in radar signal processing module. IC Role / Device Role / Timing Role: SLAVE buffer enabling zero-wait-state memory access for both processors during simultaneous FFT and control loop execution. Use Value: BUSY input-driven arbitration prevents data corruption during concurrent address-space access without software overhead. |
| Industrial PLC I/O Mapping | Military Radio Baseband Memory |
Use Scenario: Synchronized update of digital I/O status tables between PLC CPU and fieldbus controller (e.g., Profibus DP slave). IC Role / Device Role / Timing Role: SLAVE memory holding mirrored I/O image updated via left port (CPU) and read by right port (fieldbus interface). Use Value: Industrial temp rating (–40°C to +85°C) and 2V data retention ensure reliable operation in unconditioned cabinet environments. | Use Scenario: Secure waveform buffering in software-defined radio (SDR) transceiver operating in extended temperature military zones. IC Role / Device Role / Timing Role: SLAVE SRAM storing encrypted baseband samples exchanged between encryption ASIC and RF front-end controller. Use Value: MIL-PRF-38535 QML-compliant construction guarantees reliability under shock, vibration, and radiation exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1355KV18-55BZXI | 1M × 18 QDR SRAM, 1.8V core, 3.3V I/O; no BUSY arbitration; requires external logic for contention handling | Higher density but lacks native SLAVE arbitration - unsuitable for drop-in replacement in IDT7130/7140 MASTER/SLAVE systems | Select only if migrating to QDR architecture with FPGA-based arbitration and voltage translation |
| AS7C31026B-55JCIN | 1M × 16 async SRAM, single-port, 3.3V only; no dual-port capability or BUSY signaling | Cannot support simultaneous left/right access - requires redesign of memory controller and software layer | Use only for cost-sensitive, non-real-time applications where dual-port functionality is unnecessary |
Compared with CY7C1355KV18-55BZXI and AS7C31026B-55JCIN, the 7140LA55J uniquely delivers native SLAVE arbitration, 2V data retention, and industrial temperature operation in a pin-compatible 48-pin footprint - making it irreplaceable for legacy IDT-based dual-port memory systems requiring deterministic contention resolution.
Availability
7140LA55J is available at Aetrix Electronics and suitable for avionics data buffering, DSP co-processor memory, and industrial PLC I/O mapping requiring stable component supply across extended lifecycle programs.
Supply support for 7140LA55J 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 IDT7140 product line was engineered specifically for MASTER/SLAVE dual-port SRAM expansion in real-time embedded systems - delivering deterministic arbitration, battery backup, and industrial/military reliability without external glue logic.
FAQ
What is the maximum operating temperature range for the 7140LA55J?
The 7140LA55J is rated for industrial temperature operation from –40°C to +85°C, validated across all electrical parameters including 55 ns access time, 2V data retention, and standby current. This range is explicitly confirmed in IDT's "Recommended Operating Temperature and Supply Voltage" table and applies to all package variants (FP48, PDG48, SB48) of the 7140LA55J.
Does the 7140LA55J include on-chip arbitration logic?
No, the 7140LA55J does not include on-chip arbitration logic - it is a SLAVE-only device. Arbitration is handled externally via its BUSYL and BUSYR input pins, which must be driven low by a MASTER device (e.g., IDT7130) during address contention. This architectural distinction is fundamental: only the IDT7130 MASTER contains internal arbitration circuitry.
Can the 7140LA55J retain data at 2V, and under what conditions?
Yes, the 7140LA55J guarantees data retention at VCC = 2.0 V minimum, as specified in the "Data Retention Characteristics (LA Version Only)" table. This applies only when CE is held high (standby mode), ambient temperature is +25°C, and the device is in full standby (ISB3 condition). The parameter is guaranteed but not production tested per IDT documentation.
What is the function of the BUSYL and BUSYR pins on the 7140LA55J?
On the 7140LA55J, BUSYL and BUSYR are dedicated arbitration input pins - not outputs. When either pin is driven low by an external MASTER device (e.g., IDT7130), writes to the corresponding port (left or right) are internally inhibited. This behavior is strictly defined in Truth Table III and distinguishes the 7140LA55J from the MASTER IDT7130, whose BUSY pins are open-drain outputs.
Is the 7140LA55J pin-compatible with other speed grades in the IDT7140LA family?
Yes, the 7140LA55J is pin-compatible with all IDT7140LA speed variants (e.g., 7140LA25J, 7140LA35J) across identical package types (FP48, PDG48, SB48). Pin functions, voltage levels, and timing interfaces are identical; only AC timing parameters (tRC, tAA, etc.) differ. This allows direct substitution in existing layouts when timing margins permit.
7140LA55J 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:
- 55ns
- Access Time:
- 55 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)
7140LA55J FAQ
1.How can I place an order for 7140LA55J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA55J 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 7140LA55J reliable?
The price and inventory of 7140LA55J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA55J is usually 5 days.
3.What payment methods are accepted for 7140LA55J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA55J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA55J?
7140LA55J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA55J 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 7140LA55J?
For technical support, including 7140LA55J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA55J requirements.
6.How does Aetrix verify that 7140LA55J is sourced from the original manufacturer or authorized distributors?
All 7140LA55J 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 7140LA55J meets industry standards.
7.What is the process for return or replacement of 7140LA55J?
All 7140LA55J units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA55J, 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 7140LA55J part is unused and in its original packaging.
Return procedure for 7140LA55J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA55J Tags
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