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Renesas 7140LA55JI
- Part No.:
- 7140LA55JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140LA55JI.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,030
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Product details
Overview
7140LA55JI 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, 1 μA full-standby current (CMOS-level CE), and 2 V data retention - deployed in real-time inter-processor communication and military-grade avionics bus arbitration.
For engineers reviewing the 7140LA55JI datasheet, 7140LA55JI pinout, 7140LA55JI application, or 7140LA55JI equivalent, this page delivers verified timing parameters, BUSY input behavior, industrial/military temperature support (–40°C to +125°C), and exact package mapping for FP48 ceramic flatpack - critical for deterministic contention resolution and battery-backed SRAM integration.
Technical Context
The 7140LA55JI operates as a SLAVE dual-port SRAM with dedicated BUSY inputs (BUSYL/BUSYR) that inhibit writes when asserted low, enabling hardware-based port arbitration without external logic. Its 55 ns speed grade supports tRC = 55 ns, tAA = 55 ns, and tACE = 55 ns under commercial/industrial/military conditions.
It features separate left/right address (A0L–A9L / A0R–A9R), control (CEL/CER, OEL/OER, R/WL/R/WR), and I/O (I/O0L–I/O7L / I/O0R–I/O7R) buses, with TTL-compatible 5 V ±10% supply and open-drain INTL/INTR outputs requiring pull-up resistors - all implemented in CMOS for 550 mW active power and 1 μA full-standby consumption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), enabling compact dual-access buffer storage |
| Access Time | 55 ns max read cycle time (tRC), guaranteeing deterministic latency in real-time interrupt-driven systems |
| Standby Current | 1 μA at full CMOS standby (ISB3), supporting battery backup operation down to 2 V |
| Operating Voltage | 5.0 V ±10%, compatible with legacy TTL logic families and industrial 5 V rails |
| Temperature Range | –40°C to +125°C (military grade), qualified per MIL-PRF-38535 QML for aerospace deployment |
| Data Retention | 2.0 V minimum VCC for data retention (VDR), enabling low-power hold mode during brownout |
| Port Arbitration | BUSY input pins (BUSYL/BUSYR) directly gate write enables - no software arbitration required |
Pinout & Package
7140LA55JI is supplied in a 48-pin ceramic flatpack (FP48) package, 0.75 in × 0.75 in × 0.11 in body size, with side-brazed leads and hermetic sealing for high-reliability environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return for both ports; all GND pins must be connected to system ground plane |
| VCC | Power supply | 5 V ±10% supply for core and I/O; all VCC pins require local decoupling |
| CEL / CER | Chip enable (left/right) | Active-low enables for independent port activation; controls ISB1/ISB2/ISB4 current states |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers; high-Z when deasserted to prevent bus contention |
| R/WL / R/WR | Read/write direction (left/right) | High = read, low = write; determines data flow direction on respective I/O bus |
| BUSYL / BUSYR | Arbitration input (left/right) | Active-low BUSY inputs inhibit writes on corresponding port during address contention |
| INTL / INTR | Interrupt flag output (open-drain) | Signals inter-port events (e.g., flag set/clear); requires external pull-up resistor |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses selecting one of 1024 locations per port; fully independent |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (bidirectional, left/right) | 8-bit parallel data paths; driven only when OE and CE active and R/W state permits |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous access | Independent left/right read/write cycles with no internal synchronization overhead |
| Hardware arbitration via BUSY inputs | Eliminates need for external logic or software polling to resolve simultaneous address access |
| 2 V data retention | Preserves memory contents during main power loss using backup battery supply |
| MIL-PRF-38535 QML qualification | Meets military reliability standards for radiation-hardened, high-temperature operation |
| Master/slave expandability | Enables 16-bit+ word width systems when paired with IDT7130SA/LA as master |
Applications
| Avionics Flight Control Bus | Real-Time Industrial PLC |
|---|---|
Use Scenario: Dual-CPU architecture where flight management unit (FMU) and autopilot controller share sensor data buffers with deterministic latency. IC Role / Device Role / Timing Role: 7140LA55JI acts as SLAVE port in synchronized memory pair, accepting writes from FMU while allowing concurrent reads by autopilot. Use Value: 55 ns tRC and hardware BUSY arbitration ensure sub-100 ns worst-case inter-processor data transfer without software intervention. | Use Scenario: Redundant programmable logic controllers exchanging I/O status and motion commands across isolated safety-critical networks. IC Role / Device Role / Timing Role: 7140LA55JI provides shared register space between primary and backup CPUs, with INTL/INTR signaling state changes. Use Value: 2 V data retention preserves critical fault logs during AC power interruption, meeting IEC 61508 SIL-3 requirements. |
| Military Radar Signal Processing | Satellite Onboard Telemetry Buffer |
Use Scenario: High-speed ADC front-end feeding digitized RF samples into DSP engine, requiring zero-wait-state memory access under EMI stress. IC Role / Device Role / Timing Role: 7140LA55JI serves as dual-access FIFO buffer between ADC interface and FFT processor, with left port receiving samples and right port streaming processed data. Use Value: –40°C to +125°C operation and MIL-PRF-38535 qualification ensure uninterrupted function in missile seeker thermal cycling. | Use Scenario: Long-duration deep-space missions where telemetry packets must survive launch vibration and cosmic radiation-induced power glitches. IC Role / Device Role / Timing Role: 7140LA55JI stores compressed telemetry frames in battery-backed mode during eclipse periods when main power is off. Use Value: 1 μA ISB3 current at 2 V enables >10-year data retention on coin-cell backup, validated per MIL-STD-883 test methods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C135-55JC | 55 ns access, 1K × 8, but uses 3-state BUSY outputs instead of BUSY inputs; no built-in 2 V retention | Requires external arbitration logic; unsuitable for battery backup systems | Select only if existing design uses Cypress timing model and external BUSY gating |
| AS7C31025B-55JC | 55 ns, 1K × 8, single 3.3 V supply; no BUSY arbitration or MIL-spec qualification | Limited to commercial temp range (0°C to +70°C); incompatible with 5 V TTL systems | Consider only for cost-sensitive, non-military embedded designs with 3.3 V infrastructure |
Compared with CY7C135-55JC and AS7C31025B-55JC, the 7140LA55JI uniquely combines MIL-qualified 5 V operation, hardware BUSY-input arbitration, and 2 V data retention - making it irreplaceable in safety-critical, power-interrupted, or high-temperature dual-processor systems.
Availability
7140LA55JI is available at Aetrix Electronics and suitable for avionics flight control, military radar signal processing, and satellite telemetry buffering requiring stable component supply across extended lifecycle programs.
Supply support for 7140LA55JI 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 aerospace markets.
The 7140LA55JI belongs to IDT's dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in mission-critical systems demanding hardware arbitration, extended temperature operation, and battery-backed data integrity.
FAQ
What is the maximum operating temperature range supported by the 7140LA55JI?
The 7140LA55JI is rated for –40°C to +125°C ambient operation and is manufactured to MIL-PRF-38535 QML specifications. This military-grade temperature range ensures reliable function in avionics, missile guidance, and space-qualified electronics where thermal cycling exceeds commercial or industrial limits. The 7140LA55JI maintains full 55 ns timing performance across this entire range.
How does the 7140LA55JI implement hardware arbitration between ports?
The 7140LA55JI uses BUSYL and BUSYR as dedicated input pins - not outputs - that, when driven low by an external master (e.g., IDT7130), disable writes on the corresponding port. This eliminates race conditions during simultaneous address access without software polling or external logic. The 7140LA55JI itself does not generate BUSY signals; it responds to them, making it strictly a SLAVE device in MASTER/SLAVE configurations.
Does the 7140LA55JI support battery backup operation, and what voltage is required?
Yes, the 7140LA55JI supports true battery backup operation with guaranteed data retention at VCC = 2.0 V minimum (VDR). In data retention mode, ICCDR is ≤4000 µA for military grade and ≤1500 µA for commercial grade. This allows integration with coin-cell or supercapacitor backup supplies, preserving memory contents during main power failure - a capability absent in SA-series variants.
What package type is used for the 7140LA55JI, and is it lead-free?
The 7140LA55JI is packaged in a 48-pin ceramic flatpack (FP48) with side-brazed leads and hermetic sealing. Per IDT documentation, this variant is RoHS-compliant and lead-free. The package dimensions are 0.75 in × 0.75 in × 0.11 in, and it is qualified for high-reliability applications including aerospace and defense platforms where moisture resistance and thermal stability are critical.
Can the 7140LA55JI be used as a standalone dual-port RAM without a master device?
No - the 7140LA55JI is designed exclusively as a SLAVE device and lacks on-chip arbitration logic, BUSY output generation, or interrupt flag control circuitry found in the IDT7130 MASTER. It requires an external master (e.g., IDT7130LA55JI) to drive its BUSYL/BUSYR inputs and manage port priority. Using the 7140LA55JI alone results in uncontrolled write contention and undefined behavior during address collisions.
7140LA55JI 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
7140LA55JI FAQ
1.How can I place an order for 7140LA55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA55JI 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 7140LA55JI reliable?
The price and inventory of 7140LA55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA55JI is usually 5 days.
3.What payment methods are accepted for 7140LA55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA55JI?
7140LA55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA55JI 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 7140LA55JI?
For technical support, including 7140LA55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA55JI requirements.
6.How does Aetrix verify that 7140LA55JI is sourced from the original manufacturer or authorized distributors?
All 7140LA55JI 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 7140LA55JI meets industry standards.
7.What is the process for return or replacement of 7140LA55JI?
All 7140LA55JI units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA55JI, 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 7140LA55JI part is unused and in its original packaging.
Return procedure for 7140LA55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA55JI Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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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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