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Renesas 7133LA55JI
- Part No.:
- 7133LA55JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7133LA55JI.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,384
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Product details
Overview
7133LA55JI from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 55 ns max read cycle time, industrial temperature range (–40°C to +85°C), and 1 mW typical standby power. It enables simultaneous asynchronous access from left and right ports in real-time systems such as military avionics data buffers and industrial motion controller memory coherency modules.
For engineers reviewing the 7133LA55JI datasheet, 7133LA55JI pinout, 7133LA55JI application, or 7133LA55JI equivalent, this page delivers verified timing parameters, BUSY arbitration behavior, byte-select write control, battery backup capability (2 V data retention), and package-specific I/O mapping for reliable system integration.
Technical Context
The 7133LA55JI implements fully asynchronous dual-port operation with independent address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves contention when both ports access the same memory location, asserting open-drain BUSYL/BUSYR outputs to stall conflicting writes.
It supports separate upper- and lower-byte write enable (R/WLUB/R/WLLB and R/WRUB/R/WRLB), TTL-compatible 5 V ±10% supply, and automatic power-down via chip enable (CEL/CER). The LA variant reduces active current to 1050 mW typ. and standby to 1 mW typ., enabling battery-backed retention at 2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 K × 16 bits (32 KB total, organized as 2048 words × 16-bit wide) |
| Max Read Cycle Time | 55 ns - defines minimum interval between successive reads on same port |
| Standby Current | 1 mA typ. - enables ultra-low-power battery backup mode with 2 V VCC |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded environments |
| Supply Voltage | 4.5 V to 5.5 V - single TTL-compatible rail, no auxiliary supplies required |
| Bus Width Expansion | Master-only arbitration - enables 32-bit+ systems using IDT7143LA slaves without external logic |
| Input Capacitance | 11 pF - ensures stable signal integrity at high-speed bus switching |
Pinout & Package
7133LA55JI is packaged in a 68-pin PLCC (PLG68) with 0.95″ × 0.95″ footprint. Both VCC pins must be connected to 5 V and both GND pins to ground for reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L / A0R–A10R | Address Inputs (Left/Right) | 11-bit address per port selects one of 2048 memory locations |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data I/O (Left/Right) | 16-bit parallel data path per port; high-impedance when disabled |
| CEL / CER | Chip Enable (Left/Right) | Active-low enables port access and controls power-down state |
| R/WLUB / R/WRUB | Upper Byte Write Enable (Left/Right) | Controls write to I/O8–I/O15; allows byte-granular memory updates |
| R/WLLB / R/WRLB | Lower Byte Write Enable (Left/Right) | Controls write to I/O0–I/O7; enables partial-word writes without read-modify-write |
| OEL / OER | Output Enable (Left/Right) | Active-low enables output drivers; decouples read data from bus timing |
| BUSYL / BUSYR | Busy Flag (Open-Drain Output) | Indicates port contention; requires external pull-up; used for hardware arbitration stall |
Key Features
| Feature | Design Value |
|---|---|
| On-chip arbitration logic | Resolves same-address contention automatically; eliminates need for external priority encoder or glue logic |
| Separate byte write control | Enables atomic 8-bit updates to upper/lower half of 16-bit word without corrupting adjacent bytes |
| 2 V data retention | Maintains stored contents during main power loss using backup battery-critical for nonvolatile buffer applications |
| Master/Slave expansion architecture | One 7133LA55JI master coordinates arbitration across multiple 7143LA slaves for seamless 32-bit+ bus width scaling |
| Industrial temperature qualification | Guaranteed operation from –40°C to +85°C-validated for factory automation and outdoor telecom equipment |
Applications
| Avionics Real-Time Data Buffer | Industrial Motion Controller Coherence |
|---|---|
Use Scenario: Dual-CPU system where flight management unit (FMU) and autopilot processor concurrently access shared sensor fusion data. IC Role / Device Role / Timing Role: 7133LA55JI serves as contention-managed shared memory with BUSY-driven stall signaling to prevent race conditions. Use Value: Eliminates software locks and polling; guarantees deterministic <55 ns read latency under concurrent access. |
Use Scenario: CNC machine controller synchronizing position feedback from multiple axes while updating trajectory commands. IC Role / Device Role / Timing Role: 7133LA55JI provides low-latency, byte-selectable memory for real-time servo loop variables and command queues. Use Value: Enables sub-microsecond inter-processor communication with hardware-enforced write protection during critical motion segments. |
| Military Radar Signal Processing Buffer | Telecom Baseband Shared Memory |
Use Scenario: Radar front-end digitizer and DSP engine share intermediate FFT results in harsh environmental conditions. IC Role / Device Role / Timing Role: 7133LA55JI operates as radiation-tolerant, temperature-stable dual-port RAM with battery backup for mission-critical data preservation. Use Value: Maintains 2 V data retention during brownouts; meets MIL-PRF-38535 QML requirements for deployed systems. |
Use Scenario: LTE baseband processor and RF transceiver IC exchange IQ samples and channel estimates in full-duplex mode. IC Role / Device Role / Timing Role: 7133LA55JI acts as zero-wait-state ping-pong buffer with independent port timing to decouple transmit/receive pipelines. Use Value: Achieves sustained 18 MB/s throughput (2048 × 16 @ 55 ns) without CPU intervention or DMA overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 7133SA55JI | Higher active power (1150 mW typ. vs. 1050 mW); no 2 V data retention | Suitable for commercial-temp systems where battery backup is unnecessary | Select when lowest standby power is not required and cost sensitivity favors SA grade |
| 7143LA55JI | Slave-only device; BUSY pins are inputs only; no on-chip arbitration logic | Used only in width-expanded systems with a 7133LA master; cannot operate standalone | Choose only as companion to 7133LA55JI in 32-bit+ configurations requiring hardware arbitration |
Compared with 7133SA55JI, the 7133LA55JI reduces standby power by 80% and adds 2 V data retention-critical for battery-backed systems. Compared with 7143LA55JI, it provides full master functionality including arbitration logic and BUSY output, enabling standalone or master-only deployment.
Availability
7133LA55JI is available at Aetrix Electronics and suitable for avionics data buffering, industrial motion control, and military radar signal processing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 7133LA55JI 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 industrial markets.
The 7133LA55JI belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, contention-free memory sharing between real-time processors in safety-critical and ruggedized systems.
FAQ
What is the maximum operating temperature range for the 7133LA55JI?
The 7133LA55JI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the manufacturer's test conditions and applies across all electrical parameters including 55 ns read cycle time and 1 mW standby current. The part does not support military-grade –55°C to +125°C operation-those requirements are met only by designated MIL-PRF-38535 QML variants such as 7133LA55JM.
Does the 7133LA55JI support true simultaneous read/write operations on both ports?
Yes-the 7133LA55JI supports fully asynchronous, independent read and write operations on left and right ports. However, if both ports attempt to access the same memory address concurrently, its on-chip arbitration logic asserts BUSYL or BUSYR to stall the later-accessing port. Valid data appears only after contention resolution, with tBDD delay up to 40 ns depending on speed grade.
How is battery backup implemented in the 7133LA55JI?
The 7133LA55JI supports data retention at VCC = 2.0 V, drawing ≤4000 µA (typ. 100 µA) in retention mode. To implement backup, connect a 2 V battery to VCC through a diode or ideal diode controller, ensuring CEL and CER remain high during main power loss. The 7133LA55JI retains all 32 KB of data indefinitely under these conditions.
Can the 7133LA55JI be used without external pull-up resistors on BUSYL and BUSYR?
No-BUSYL and BUSYR are open-drain outputs per the datasheet and require external pull-up resistors to VCC (5 V). Without pull-ups, the BUSY signals cannot drive high, preventing proper arbitration stall signaling. Typical values are 4.7 kΩ; stronger pull-ups reduce rise time but increase standby current slightly.
What package type is used for the 7133LA55JI, and are there pin-compatible alternatives?
The 7133LA55JI uses a 68-pin PLCC (PLG68) package with 0.95″ × 0.95″ body size. It shares identical pinout with IDT7133/7143 SA/LA variants in PLCC, PGA, flatpack, and TQFP packages-but only the PLCC variant carries the "J" suffix in the ordering code. No pin-compatible drop-in replacements exist outside the IDT7133/7143 family.
7133LA55JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 68-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 32Kbit
- Memory Organization:
- 2K x 16
- 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:
- 68-PLCC (24.21x24.21)
7133LA55JI FAQ
1.How can I place an order for 7133LA55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7133LA55JI 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 7133LA55JI reliable?
The price and inventory of 7133LA55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7133LA55JI is usually 5 days.
3.What payment methods are accepted for 7133LA55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7133LA55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7133LA55JI?
7133LA55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7133LA55JI 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 7133LA55JI?
For technical support, including 7133LA55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7133LA55JI requirements.
6.How does Aetrix verify that 7133LA55JI is sourced from the original manufacturer or authorized distributors?
All 7133LA55JI 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 7133LA55JI meets industry standards.
7.What is the process for return or replacement of 7133LA55JI?
All 7133LA55JI units undergo pre-shipment inspection (PSI). If there is an issue with 7133LA55JI, 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 7133LA55JI part is unused and in its original packaging.
Return procedure for 7133LA55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7133LA55JI Tags
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