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Renesas 7130LA55JI
- Part No.:
- 7130LA55JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7130LA55JI.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,867
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Product details
Overview
7130LA55JI from IDT is a high-speed 1K × 8 dual-port static RAM with master arbitration logic, 55 ns maximum read/write cycle time, 1 mA typical standby current, and 2 V data retention capability - used in real-time inter-processor communication systems requiring concurrent access to shared memory.
For engineers reviewing the 7130LA55JI datasheet, 7130LA55JI pinout, 7130LA55JI application, or 7130LA55JI equivalent, this page delivers verified timing parameters, port arbitration behavior, BUSY/INT flag operation, battery-backed retention specs, and industrial temperature support (–40°C to +85°C).
Technical Context
The 7130LA55JI implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves contention via open-drain BUSYL/BUSYR outputs that inhibit writes when address matches occur between ports.
It supports R/W-controlled and CE-controlled write cycles, features interrupt flag generation (INTL/INTR) for port-to-port signaling, and enters data retention mode at VCC = 2.0 V with ≤4 µA ICCDR (industrial grade), enabling low-power backup operation without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), providing compact shared memory for tightly coupled dual-CPU or DSP+MCU architectures. |
| Access Time | 55 ns max (tAA, tACE, tAOE), enabling integration into 18 MHz synchronous bus systems with margin. |
| Standby Current | 1 mA typical (ISB3, CMOS-level inputs), reducing system power during idle states without disabling ports. |
| Data Retention | 2.0 V minimum VCC, supporting coin-cell or supercapacitor backup for nonvolatile state preservation. |
| Operating Temp | –40°C to +85°C (industrial grade), qualified for embedded control, avionics subsystems, and industrial PLCs. |
| Supply Voltage | 4.5 V to 5.5 V (VCC), TTL-compatible with standard 5 V logic families and legacy microcontroller buses. |
| Arbitration Logic | On-chip port arbitration with tAPS = 5 ns setup, eliminating need for external glue logic in MASTER/SLAVE configurations. |
Pinout & Package
7130LA55JI is supplied in a 48-pin ceramic flatpack (FP48) package measuring approximately 0.75 in × 0.75 in × 0.11 in, with through-hole mounting and hermetic sealing for high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A9L | Left port address inputs | 10-bit address bus for left-side memory access; supports full 1K addressing without external decoding. |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit tri-state I/O bus; driven only when CEL = L and OEL = L (read) or R/WL = L (write). |
| CEL, OEL, R/WL | Left port controls | Chip Enable, Output Enable, Read/Write select - fully independent of right port timing and logic. |
| BUSYL, INTL | Left port open-drain flags | BUSYL signals arbitration conflict (requires external pull-up); INTL asserts on interrupt address match (3FEh). |
| A0R–A9R | Right port address inputs | Independent 10-bit address space; concurrent access possible unless address collision triggers BUSY assertion. |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated from left I/O; no bus contention risk when both ports active. |
| CER, OER, R/WR | Right port controls | Asynchronous enable/control set - identical timing behavior to left port but with separate signal names. |
| BUSYR, INTR | Right port open-drain flags | BUSYR mirrors BUSYL behavior for right port; INTR responds to 3FFh write on left port. |
| VCC, GND | Power supply | Single 5 V supply; all VCC pins must be connected; all GND pins tied to common ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Master arbitration logic | Resolves simultaneous access conflicts automatically using address-match detection and BUSY flag assertion - no external arbitration IC required. |
| 2 V data retention | Preserves memory contents during brown-out or main power loss using minimal backup current (≤4 µA), enabling seamless resume after recovery. |
| Dual independent ports | Full asynchronous operation: left and right ports may perform reads/writes concurrently, with no internal synchronization overhead. |
| Interrupt signaling | Hardware-interrupt generation (INTL/INTR) triggered by specific address writes (3FEh/3FFh), enabling efficient inter-processor notification without polling. |
| Low-power standby modes | Four distinct standby states (ISB1–ISB4) allow fine-grained power management - e.g., one port active while other fully powered down. |
Applications
| Real-Time Control Systems | Digital Signal Processing |
|---|---|
Use Scenario: Dual-CPU motion controller where one CPU handles trajectory planning and the other executes servo loop updates. IC Role / Device Role / Timing Role: Shared memory buffer enabling deterministic, lock-free exchange of position setpoints and feedback data between CPUs. Use Value: Eliminates software semaphores and reduces inter-processor latency to <55 ns, ensuring sub-microsecond coordination. | Use Scenario: Radar signal processor with dedicated FFT engine and host ARM core sharing raw IQ samples and processed results. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state ping-pong buffer between processing stages, synchronized via BUSY/INT handshake. Use Value: Enables continuous streaming at 100 MB/s aggregate bandwidth without DMA stalls or FIFO overflow. |
| Avionics Data Concentrators | Industrial PLC Communication Modules |
Use Scenario: ARINC 429 interface module collecting sensor data from multiple line-replaceable units (LRUs) and forwarding to flight management computer. IC Role / Device Role / Timing Role: Memory hub buffering time-stamped messages from parallel input channels before multiplexing onto shared bus. Use Value: Guarantees atomic message capture under EMI stress due to hardware arbitration and open-drain BUSY signaling. | Use Scenario: Modbus TCP gateway bridging Ethernet/IP network with legacy RS-485 fieldbus, requiring real-time register mapping and status mirroring. IC Role / Device Role / Timing Role: Shared register file accessed simultaneously by Ethernet MAC controller and fieldbus UART controller. Use Value: Supports deterministic 1 ms scan cycles with guaranteed coherency via hardware-enforced write inhibition during contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C131-55JC | 55 ns access, 1K × 8, but lacks on-chip arbitration logic and BUSY output; requires external logic for conflict resolution. | Suitable only in systems where software-managed mutual exclusion is acceptable or where contention is architecturally prevented. | Select when cost sensitivity outweighs need for hardware arbitration and deterministic latency. |
| IDT7140LA55JI | Same family, SLAVE device; has BUSY inputs (not outputs), no arbitration logic, and relies on external MASTER (e.g., 7130) for coordination. | Used only in expanded 16-bit+ word width systems paired with 7130; cannot operate standalone as shared memory. | Choose only when building wider memory banks with MASTER/SLAVE topology and board space permits two devices. |
Compared with CY7C131-55JC and IDT7140LA55JI, the 7130LA55JI uniquely integrates arbitration, interrupt, and retention features in a single chip - reducing BOM count, PCB area, and firmware complexity for real-time dual-processor designs.
Availability
7130LA55JI is available at Aetrix Electronics and suitable for real-time control systems, avionics data concentrators, digital signal processing subsystems, and industrial PLC communication modules requiring stable component supply across extended product lifecycles.
Supply support for 7130LA55JI 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 high-performance silicon solutions for communications, computing, and industrial markets.
The IDT7130/7140 family was designed specifically for deterministic, low-latency inter-processor communication in safety-critical and real-time embedded systems - emphasizing hardware arbitration, dual-port concurrency, and robust data retention.
FAQ
What is the maximum operating temperature range for the 7130LA55JI?
The 7130LA55JI is rated for industrial temperature operation from –40°C to +85°C, as confirmed in the "Recommended Operating Temperature and Supply Voltage" table (2689 tbl 03). This specification applies to all LA-grade variants including the 55 ns speed bin, and is validated per MIL-PRF-38535 QML for high-reliability applications.
Does the 7130LA55JI support true simultaneous read/write operations on both ports?
Yes, the 7130LA55JI supports fully asynchronous concurrent access: one port may read while the other writes, provided no address collision occurs. If addresses match, on-chip arbitration asserts BUSYL or BUSYR to inhibit the later-arriving write, preserving data integrity without external logic - as defined in Truth Table III and timing diagrams drw 12–15.
How does the 7130LA55JI achieve 2 V data retention, and what is the typical current draw in that mode?
The 7130LA55JI achieves 2 V data retention through optimized CMOS design and low-leakage transistors. In retention mode (VCC = 2.0 V, CE high), it draws ≤4 µA (industrial grade) as specified in 2689 tbl 07. This enables direct connection to backup sources like CR2032 cells without regulators or diodes.
What is the function of the BUSYL and BUSYR pins on the 7130LA55JI?
BUSYL and BUSYR are open-drain arbitration status outputs on the 7130LA55JI. When asserted LOW, they indicate that the corresponding port's write is inhibited due to address collision with the opposite port. External pull-up resistors are required, and the signals directly control write-enable gating in external logic - as noted in Functional Block Diagram notes and Truth Table III.
Can the 7130LA55JI be used as a standalone dual-port memory, or does it require pairing with an IDT7140?
The 7130LA55JI operates fully standalone as a 1K × 8 dual-port SRAM with integrated arbitration. It only requires pairing with IDT7140 when expanding to 16-bit or wider data paths - a system-level design choice, not a functional dependency. The datasheet explicitly states "IDT7130 is designed to be used as a stand-alone 8-bit Dual-Port RAM" (Description section, Page 2).
7130LA55JI 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)
7130LA55JI FAQ
1.How can I place an order for 7130LA55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7130LA55JI 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 7130LA55JI reliable?
The price and inventory of 7130LA55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7130LA55JI is usually 5 days.
3.What payment methods are accepted for 7130LA55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7130LA55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7130LA55JI?
7130LA55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7130LA55JI 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 7130LA55JI?
For technical support, including 7130LA55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7130LA55JI requirements.
6.How does Aetrix verify that 7130LA55JI is sourced from the original manufacturer or authorized distributors?
All 7130LA55JI 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 7130LA55JI meets industry standards.
7.What is the process for return or replacement of 7130LA55JI?
All 7130LA55JI units undergo pre-shipment inspection (PSI). If there is an issue with 7130LA55JI, 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 7130LA55JI part is unused and in its original packaging.
Return procedure for 7130LA55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7130LA55JI Tags
-
M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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