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Renesas 7133LA55J8
- Part No.:
- 7133LA55J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7133LA55J8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,856
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Product details
Overview
7133LA55J8 from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 55 ns max read cycle time, 2V data retention capability, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access from two independent ports in real-time embedded systems requiring deterministic memory contention resolution - such as dual-CPU communication buffers or video frame buffer controllers.
For engineers reviewing the 7133LA55J8 datasheet, 7133LA55J8 pinout, 7133LA55J8 application, or 7133LA55J8 equivalent, this page delivers verified electrical specs, validated pin functions, confirmed package mapping (68-pin PLCC), and two technically documented alternative parts for width-expansion or low-power dual-port SRAM selection.
Technical Context
The 7133LA55J8 implements on-chip port arbitration logic that resolves simultaneous accesses to identical addresses by asserting BUSY on the losing port - a hardware-enforced priority mechanism unique to the MASTER IDT7133 family. Its open-drain BUSYL/BUSYR outputs require external pull-up resistors and support cascaded MASTER/SLAVE configurations for 32-bit+ bus expansion without external logic.
It operates fully asynchronously per port with separate byte-level write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), TTL-compatible signaling, single 5V ±10% supply, and battery backup mode enabling 2V data retention. The LA variant reduces active power to 1050 mW (typ.) and standby current to 1 mA (typ.), critical for power-constrained industrial control nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 16 bits (32,768 bits total); supports independent 16-bit word access per port |
| Read Cycle Time | 55 ns max - defines minimum interval between successive reads on same port |
| Data Retention Voltage | 2.0 V min - enables battery-backed operation during main power loss |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5V TTL logic rails |
| Standby Current | 1 mA typ. - enables ultra-low-power sleep states in always-on monitoring systems |
| Active Power | 1050 mW typ. - 100 mW lower than SA variant, reducing thermal load in dense PCB layouts |
Pinout & Package
7133LA55J8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 0.95 in × 0.95 in × 0.17 in. Both VCC and GND pins must be connected for reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable per port; controls port power-down and memory access gating |
| R/WLUB / R/WRUB | Upper Byte Write Enable | Independent write control for I/O8–I/O15 on left/right port - enables byte-select writes |
| R/WLLB / R/WRLB | Lower Byte Write Enable | Independent write control for I/O0–I/O7 on left/right port - enables byte-select writes |
| OEL / OER | Output Enable (Left / Right) | Active-low tri-state control for I/O drivers; allows shared bus operation |
| BUSYL / BUSYR | Busy Flag (Open-Drain Output) | Indicates arbitration conflict on same-address access; requires external pull-up resistor |
| A0L–A10L / A0R–A10R | Address Inputs | 11-bit address per port (211 = 2048 locations); supports full 2K × 16 addressing |
| I/O0L–I/O15L / I/O0R–I/O15R | Data I/O (Bidirectional) | 16-bit parallel data path per port; electrically isolated for true dual-port concurrency |
Key Features
| Feature | Design Value |
|---|---|
| On-chip arbitration logic | Hardware-resolved port contention eliminates need for external priority encoders or software polling |
| Separate upper/lower byte write enables | Enables partial-word writes without read-modify-write cycles - critical for protocol register updates |
| 2V data retention mode | Preserves memory contents during brown-out or battery-backup operation without external circuitry |
| Master/Slave expandability | One 7133LA55J8 MASTER coordinates BUSY arbitration for multiple SLAVE IDT7143 devices in 32-bit+ systems |
| Industrial temperature qualification | Guaranteed functionality across –40°C to +85°C without derating - suitable for factory automation controllers |
Applications
| Real-Time Dual-CPU Communication Buffer | Video Frame Buffer Controller |
|---|---|
Use Scenario: Two independent processors exchange status, commands, and telemetry via shared memory without software locks or interrupts. IC Role / Device Role / Timing Role: Dual-port SRAM acts as a lock-free inter-processor communication channel with hardware arbitration preventing data corruption during concurrent access. Use Value: Eliminates CPU stalls and race conditions; 55 ns access enables sub-18 MHz CPU handshake rates in deterministic control loops. |
Use Scenario: A graphics controller writes pixel data while a display engine reads out frames - both operating at different clock domains. IC Role / Device Role / Timing Role: Serves as a ping-pong frame buffer where one port writes new frame data while the other reads current frame for output. Use Value: Enables seamless frame switching with zero visual tearing; 2K × 16 capacity supports 1024×16 monochrome or segmented display buffers. |
| Industrial PLC I/O Mapping Memory | Digital Signal Processor Co-Processor Interface |
Use Scenario: Programmable Logic Controller uses dual-port RAM to decouple scan-cycle execution from real-time I/O update timing. IC Role / Device Role / Timing Role: Left port interfaces with I/O modules (scan-driven), right port interfaces with CPU (task-driven) - synchronized via BUSY arbitration. Use Value: Guarantees atomic I/O state capture; 2V retention preserves last valid I/O image during brief power interruptions. |
Use Scenario: DSP offloads compute-intensive filtering to a host microcontroller, sharing coefficient tables and streaming samples. IC Role / Device Role / Timing Role: Provides zero-wait-state memory window for bidirectional parameter and sample exchange between heterogeneous processors. Use Value: Reduces inter-processor latency to ≤55 ns; byte-select writes allow efficient coefficient updates without disturbing adjacent filter taps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7143LA55J8 | SLAVE-only device; BUSY pins are inputs only; no on-chip arbitration logic | Requires external MASTER (e.g., 7133LA55J8) for BUSY arbitration; used only in width-expanded systems | Select when building 32-bit+ dual-port memory arrays where one MASTER coordinates multiple SLAVES |
| Cypress CY7C136-55JC | 55 ns access, 2K × 16, but lacks built-in BUSY arbitration; requires external logic for contention resolution | Suitable for simpler dual-access systems where software coordination or external arbitration is acceptable | Choose when cost sensitivity outweighs need for hardware arbitration, or when legacy Cypress footprint compatibility is required |
Compared with IDT7143LA55J8 and CY7C136-55JC, the 7133LA55J8 uniquely integrates master arbitration logic and open-drain BUSY outputs - enabling self-contained, scalable dual-port memory systems without discrete glue logic or firmware overhead.
Availability
7133LA55J8 is available at Aetrix Electronics and suitable for industrial PLCs, real-time communication buffers, video frame controllers, and DSP co-processor interfaces requiring stable component supply across extended lifecycle programs.
Supply support for 7133LA55J8 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 IDT7133/7143 family was designed specifically for deterministic dual-processor memory sharing - delivering hardware arbitration, battery backup, and industrial-grade reliability in real-time embedded control and signal processing systems.
FAQ
What is the function of the BUSY pins on the 7133LA55J8?
The BUSYL and BUSYR pins on the 7133LA55J8 are open-drain outputs that signal arbitration conflicts when both ports attempt access to the same memory location simultaneously. When asserted, they stall the losing port's operation - preventing data corruption. External pull-up resistors are mandatory, and these signals enable MASTER/SLAVE cascading with IDT7143 devices for wider bus implementations.
Does the 7133LA55J8 support battery backup operation?
Yes, the 7133LA55J8 supports battery backup operation down to 2.0 V (VDR), retaining stored data during main power loss. This is enabled by its low standby current of 1 mA (typ.) and CMOS design - allowing direct connection to a 2V backup source without additional regulators or switches.
Can the 7133LA55J8 be used without external arbitration logic?
Yes - the 7133LA55J8 contains integrated arbitration logic and requires no external components to resolve port contention. Its BUSY outputs directly manage access priority, making it self-contained for dual-CPU or processor-peripheral communication where deterministic, lock-free memory sharing is essential.
What package type is used for the 7133LA55J8?
The 7133LA55J8 is supplied in a 68-pin Plastic Leaded Chip Carrier (PLCC) package, with dimensions approximately 0.95 in × 0.95 in × 0.17 in. Pin 1 is marked with a notch or dot, and both VCC and GND pins must be connected to ensure reliable operation per manufacturer specifications.
How does the 7133LA55J8 differ from the SA version?
The 7133LA55J8 consumes 100 mW less active power (1050 mW vs. 1150 mW typ.) and achieves 1 mA vs. 5 mA typical standby current compared to the SA variant. This is achieved through optimized CMOS process tuning - making the LA version preferred for thermally constrained or battery-assisted industrial applications without sacrificing speed or functionality.
7133LA55J8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 68-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:
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.21x24.21)
7133LA55J8 FAQ
1.How can I place an order for 7133LA55J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7133LA55J8 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 7133LA55J8 reliable?
The price and inventory of 7133LA55J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7133LA55J8 is usually 5 days.
3.What payment methods are accepted for 7133LA55J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7133LA55J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7133LA55J8?
7133LA55J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7133LA55J8 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 7133LA55J8?
For technical support, including 7133LA55J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7133LA55J8 requirements.
6.How does Aetrix verify that 7133LA55J8 is sourced from the original manufacturer or authorized distributors?
All 7133LA55J8 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 7133LA55J8 meets industry standards.
7.What is the process for return or replacement of 7133LA55J8?
All 7133LA55J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7133LA55J8, 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 7133LA55J8 part is unused and in its original packaging.
Return procedure for 7133LA55J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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