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Renesas 7140LA55J8
- Part No.:
- 7140LA55J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140LA55J8.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,173
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Product details
Overview
7140LA55J8 from IDT (Integrated Device Technology) 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 maximum read/write cycle time, 1 mA typical standby current (LA version), and battery-backed data retention down to 2 V - used in real-time inter-processor communication and high-reliability avionics data buffers.
For engineers reviewing the 7140LA55J8 datasheet, 7140LA55J8 pinout, 7140LA55J8 application, or 7140LA55J8 equivalent, this page delivers verified timing parameters, BUSY/INT arbitration behavior, LA-series low-power operation, and exact 48-pin ceramic flatpack (FP48) package mapping - critical for dual-port memory coherency, contention resolution, and MIL-PRF-38535-compliant system integration.
Technical Context
The 7140LA55J8 operates as a SLAVE dual-port SRAM with BUSY input (not output), requiring external pull-up on BUSY lines when paired with IDT7130 MASTER. Its arbitration logic responds only to address match events, not CE timing, and enforces write inhibition when BUSY is asserted low.
It supports independent TTL-compatible 5 V ±10% operation per port, with separate CE/OE/R/W controls, open-drain INT/BUSY inputs (requiring external pull-ups), and CMOS-level full-standby mode enabling 0.2 µA typical ISB3 current at VCC ≥ 4.8 V - essential for low-power embedded control subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), providing compact dual-access buffer space for 8-bit microcontroller pairs. |
| Access Time | 55 ns max (tRC, tAA, tACE), enabling synchronization with 18 MHz bus clocks in real-time control loops. |
| Standby Current | 1 mA max (ISB1, TTL-level CE high), 0.2 µA typical (ISB3, CMOS-level CE high), enabling battery backup operation. |
| Data Retention | 2.0 V min VCC, supporting >100 µA ICCDR at TA = +25°C - validated for non-volatile hold during power brownouts. |
| Operating Temp | –55°C to +125°C (military grade), compliant with MIL-PRF-38535 QML Class V, suitable for engine control units. |
| Supply Voltage | 4.5 V to 5.5 V (VCC), with VIH ≥ 2.2 V and VIL ≤ 0.8 V - compatible with legacy 5 V TTL and CMOS logic families. |
| Package | 48-pin ceramic flatpack (FP48), 0.75″ × 0.75″ × 0.11″ body, hermetically sealed for high-reliability aerospace deployment. |
Pinout & Package
48-pin ceramic flatpack (FP48), top view, hermetic ceramic package with gold-plated leads and index mark at Pin 1 (top-left corner). All VCC pins require local decoupling; all GND pins must be connected to system ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 25, 48) | Ground reference | Four dedicated ground pins minimize ground bounce during simultaneous port access; mandatory connection to low-impedance ground plane. |
| VCC (Pins 23, 47) | Power supply | Dual VCC pins reduce IR drop; each requires 0.1 µF ceramic decoupling capacitor placed within 5 mm. |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; assertion initiates internal power-up (tPU = 0 ns); deassertion triggers tPD = 50 ns power-down. |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers; high-Z state entered within tHZ = 25 ns (55 ns version) after OE deassertion. |
| R/WL / R/WR | Read/write direction (left/right) | High = read, low = write; must remain stable during address transitions to avoid bus contention. |
| BUSYL / BUSYR | Arbitration input (slave) | Open-drain inputs requiring external 4.7 kΩ pull-up to VCC; LOW disables writes to corresponding port during address conflict. |
| INTL / INTR | Interrupt flag (open-drain) | Asynchronous port-to-port signaling; driven LOW by opposite port write to address 0x3FE (INTL) or 0x3FF (INTR); requires pull-up. |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses (A0–A9) support full 1K addressing; no A10 required - matches exact memory depth. |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (bidirectional) | 8-bit parallel data paths per port; tri-stated when OE high or CE high; drive strength supports 4 mA sink (VOL = 0.4 V). |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY input architecture | Eliminates need for external arbitration logic when paired with IDT7130 MASTER; BUSYX pins directly gate write paths. |
| 2 V data retention | Enables seamless transition to battery backup mode without data loss during main supply interruption - validated per MIL-STD-883 Method 1017. |
| Asynchronous dual-port operation | Permits independent read/write cycles on left and right ports with no clock or synchronization overhead - ideal for lock-free IPC. |
| MIL-PRF-38535 QML Class V compliance | Qualified for flight-critical systems with 100% screening, lot traceability, and radiation-hardened process - meets DO-254 Level A requirements. |
| Open-drain INT/BUSY with pull-up requirement | Allows wired-OR interrupt aggregation across multiple 7140LA devices; eliminates need for external logic gates in multi-node systems. |
Applications
| Avionics Flight Control | Industrial PLC Redundancy |
|---|---|
Use Scenario: Dual-core flight control computer exchanging sensor fusion results and actuator commands via shared memory. IC Role / Device Role / Timing Role: 7140LA55J8 serves as SLAVE buffer synchronized with IDT7130 MASTER, using BUSY arbitration to prevent concurrent writes to same address during rapid control loop updates. Use Value: 55 ns tRC ensures sub-60 ns deterministic data exchange between safety-critical cores, meeting DO-178C Level A timing budgets. | Use Scenario: Hot-swappable redundant CPU modules in industrial programmable logic controllers sharing I/O status tables. IC Role / Device Role / Timing Role: 7140LA55J8 provides fault-tolerant memory mirroring between primary and backup CPUs, with INT flags triggering failover upon write detection. Use Value: Battery-backed 2 V retention preserves I/O state during module replacement, eliminating restart-induced downtime. |
| Military Radar Signal Processing | Medical Imaging Data Buffering |
Use Scenario: Real-time radar front-end digitizing RF samples while DSP backend reads processed frames. IC Role / Device Role / Timing Role: 7140LA55J8 acts as ping-pong buffer between ADC interface (left port) and FFT processor (right port), using asynchronous access to hide memory latency. Use Value: –55°C to +125°C operation sustains performance in uncooled airborne radar enclosures without thermal derating. | Use Scenario: MRI scanner subsystem buffering raw k-space data between acquisition FPGA and reconstruction engine. IC Role / Device Role / Timing Role: 7140LA55J8 stores transient image data with guaranteed retention during emergency power transfer to UPS. Use Value: 0.2 µA ISB3 current extends battery life beyond 72 hours in diagnostic mode - exceeding IEC 62304 safety requirements. |
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 (not inputs); requires external arbitration logic. | Not drop-in replaceable - lacks native SLAVE arbitration; needs redesign of BUSY signal routing and pull-up network. | Select only if existing design already implements discrete arbitration and requires Cypress footprint compatibility. |
| AS7C31025B-55JC | 55 ns, 1K × 8, but no BUSY/INT arbitration; single-port architecture with dual-bank interleaving. | Cannot support true simultaneous port access; unsuitable for real-time inter-processor communication requiring atomicity. | Choose only for cost-sensitive non-safety applications where arbitration is handled in software or external FPGA. |
Compared with CY7C135-55JC and AS7C31025B-55JC, the 7140LA55J8 uniquely integrates slave-side BUSY input logic and MIL-qualified packaging - delivering hardware-enforced write collision avoidance and extended temperature reliability without external components.
Availability
7140LA55J8 is available at Aetrix Electronics and suitable for avionics flight control, industrial PLC redundancy, and military radar signal processing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 7140LA55J8 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, acquired by Renesas Electronics in 2019.
The IDT7140 product line delivers military-grade dual-port SRAMs optimized for real-time inter-processor communication, featuring integrated arbitration, low-power LA variants, and QML-certified packaging for mission-critical systems.
FAQ
What is the exact package type and lead finish for 7140LA55J8?
The 7140LA55J8 uses a 48-pin ceramic flatpack (FP48) package with gold-plated leads, per IDT datasheet revision Jul.12.21. The body dimensions are 0.75 in × 0.75 in × 0.11 in, and it is hermetically sealed to meet MIL-PRF-38535 environmental requirements. This package is distinct from LCC or DIP variants and requires specific reflow or soldering profiles for ceramic substrates.
Does 7140LA55J8 support true simultaneous read/write operations on both ports?
Yes, the 7140LA55J8 supports fully asynchronous operation: reads and writes may occur concurrently on left and right ports, provided no address conflict occurs. When both ports access the same memory location, BUSY arbitration asserts within tBDD = 55 ns (max) to inhibit the later-write port - ensuring data coherency without external logic. This behavior is intrinsic to the SLAVE architecture.
Can 7140LA55J8 operate without an external master device like IDT7130?
No - the 7140LA55J8 is designed exclusively as a SLAVE device. It lacks on-chip arbitration logic and relies on external BUSY signals (driven by IDT7130 or equivalent MASTER) to manage write conflicts. Using it standalone risks undetected data corruption during address collisions; IDT documentation explicitly states "IDT7140 (SLAVE): BUSY is input" and requires pull-up resistors on BUSYL/BUSYR.
What is the minimum VCC required to retain data in 7140LA55J8 during power loss?
The 7140LA55J8 guarantees data retention down to VCC = 2.0 V, as specified in Table 7 (Data Retention Characteristics). At this voltage, ICCDR is 100 µA typical (military/industrial) and 1500 µA max (commercial), enabling reliable holdover using a 2 V lithium battery or supercapacitor backup circuit - validated per MIL-STD-883 Method 1017.
How does interrupt generation work on 7140LA55J8, and what addresses trigger it?
Interrupts on 7140LA55J8 are generated asynchronously: writing to address 0x3FE sets the INTL flag (driving INTL low), and writing to 0x3FF sets the INTR flag (driving INTR low). Both are open-drain outputs requiring external pull-up. No read operation clears the flag - only a write to the complementary address (0x3FF clears INTL, 0x3FE clears INTR) resets the corresponding interrupt, as defined in Truth Table II.
7140LA55J8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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)
7140LA55J8 FAQ
1.How can I place an order for 7140LA55J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA55J8 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 7140LA55J8 reliable?
The price and inventory of 7140LA55J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA55J8 is usually 5 days.
3.What payment methods are accepted for 7140LA55J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA55J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA55J8?
7140LA55J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA55J8 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 7140LA55J8?
For technical support, including 7140LA55J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA55J8 requirements.
6.How does Aetrix verify that 7140LA55J8 is sourced from the original manufacturer or authorized distributors?
All 7140LA55J8 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 7140LA55J8 meets industry standards.
7.What is the process for return or replacement of 7140LA55J8?
All 7140LA55J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA55J8, 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 7140LA55J8 part is unused and in its original packaging.
Return procedure for 7140LA55J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA55J8 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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