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Renesas 7133LA45JI8
- Part No.:
- 7133LA45JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7133LA45JI8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,224
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Product details
Overview
7133LA45JI8 from IDT (Integrated Device Technology) is a high-speed 2K × 16 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 45 ns maximum read cycle time, industrial temperature range (–40°C to +85°C), and low-power LA variant consuming 1050 mW active / 1 mW standby power. It enables error-free 32-bit+ memory expansion when paired with IDT7143 SLAVE devices in real-time embedded control systems.
For engineers reviewing the 7133LA45JI8 datasheet, 7133LA45JI8 pinout, 7133LA45JI8 application, or 7133LA45JI8 equivalent, key selection criteria include BUSY arbitration timing (tBAA ≤ 40 ns), byte-selectable write control per port, battery backup data retention at 2 V, TTL-compatible 5 V ±10% operation, and support for asynchronous dual-port access without external logic.
Technical Context
The 7133LA45JI8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses - enabling simultaneous read/write operations to distinct memory locations. Its on-chip arbitration logic resolves contention when both ports access the same address, asserting open-drain BUSYL/BUSYR flags requiring external pull-up resistors.
As a MASTER device, it generates BUSY output signals used to stall slave ports (e.g., IDT7143), preventing write collisions during width expansion. The LA variant integrates CMOS low-power design with 2 V data retention capability, supporting battery-backed operation in fail-safe systems where power loss must preserve critical state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 16 bits (32 Kbit total); supports independent 16-bit word access per port |
| Access Time | 45 ns max read cycle (tRC); ensures deterministic latency in real-time DSP and control loops |
| Supply Voltage | 5.0 V ±10%; compatible with standard TTL logic families without level translation |
| Operating Temp | –40°C to +85°C industrial grade; qualified for extended-temperature industrial automation |
| Power Consumption | 1050 mW typical active; 1 mW typical standby - enables low-quiescent-power battery backup |
| Data Retention | 2 V minimum VCC; retains memory contents during main power failure using backup battery |
| Arbitration Logic | On-chip port-to-port arbitration with tBDD ≤ 40 ns; eliminates need for external bus controllers |
Pinout & Package
7133LA45JI8 is packaged in a 68-pin PLCC (Plastic Leaded Chip Carrier) with 0.05-inch lead pitch and body size ≈ 0.95 in × 0.95 in × 0.17 in. Both VCC and GND pins require connection to ensure reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L / A0R–A11R | Address Inputs (Left/Right) | 11-bit address per port; selects one of 2K locations independently |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data Bus | 16-bit parallel data path per port; supports concurrent read/write across ports |
| 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 each port - enables byte-level writes |
| R/WLLB / R/WRLB | Lower Byte Write Enable | Independent write control for I/O0–I/O7 on each port - enables byte-level writes |
| OEL / OER | Output Enable (Left/Right) | Controls tri-state output drivers; allows shared bus usage without contention |
| BUSYL / BUSYR | Busy Flag (Open Drain) | Indicates port contention; requires external pull-up; used for hardware arbitration stall |
Key Features
| Feature | Design Value |
|---|---|
| MASTER/SLAVE Width Expansion | Enables seamless 32-bit+ memory bus construction using one 7133LA45JI8 master + multiple IDT7143 slaves - no glue logic required |
| Byte-Selectable Write Control | Separate upper/lower byte write enables per port allow partial-word updates without read-modify-write cycles |
| Hardware Arbitration Logic | On-chip logic resolves same-address contention automatically; outputs BUSY flag to stall contending port - reduces software overhead |
| Battery Backup Data Retention | Maintains stored data at 2 V supply - supports fail-safe state preservation during main power interruption |
| Industrial Temperature Range | Qualified from –40°C to +85°C - suitable for under-hood automotive ECUs, factory-floor PLCs, and outdoor telecom equipment |
Applications
| Real-Time Motion Control | Digital Signal Processing Buffer |
|---|---|
Use Scenario: Dual-CPU servo drive where one processor handles trajectory planning and the other executes PWM timing-critical loop updates. IC Role / Device Role / Timing Role: 7133LA45JI8 serves as shared memory buffer with hardware arbitration ensuring deterministic access to position/velocity registers. Use Value: Eliminates software semaphore delays; 45 ns access enables sub-10 µs inter-processor synchronization for <100 kHz servo update rates. |
Use Scenario: High-throughput audio/video processing system with separate input capture and output rendering processors. IC Role / Device Role / Timing Role: 7133LA45JI8 provides zero-wait-state ping-pong buffer between ADC/DAC interfaces and DSP core. Use Value: Asynchronous dual-port operation avoids FIFO bottlenecks; byte-selectable writes reduce DMA overhead for partial-frame updates. |
| Redundant Industrial PLC Memory | Avionics System State Sharing |
Use Scenario: Safety-critical programmable logic controller with primary and hot-standby CPUs sharing configuration and I/O image. IC Role / Device Role / Timing Role: 7133LA45JI8 acts as fault-tolerant shared memory with BUSY arbitration preventing conflicting writes during switchover. Use Value: On-chip arbitration replaces external watchdog + logic circuits; 2 V data retention preserves last-known-safe state during brownout. |
Use Scenario: Flight control computer exchanging sensor fusion results and actuator commands between navigation and flight management units. IC Role / Device Role / Timing Role: 7133LA45JI8 functions as time-deterministic cross-coupling memory with guaranteed worst-case 45 ns access. Use Value: Meets DO-254 timing constraints; industrial temp rating supports operation in unpressurized avionics bays up to +85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY7C1362V-45AXC | 45 ns access, 2K × 16, but no on-chip arbitration logic; BUSY must be implemented externally | Requires additional logic for MASTER/SLAVE expansion; not drop-in for arbitration-dependent designs | Select only if arbitration handled in FPGA or if single-chip use case eliminates BUSY dependency |
| IDT7143LA45JI8 | Identical speed, package, and LA power profile, but SLAVE-only; BUSY pin is input-only, no arbitration logic | Cannot operate standalone as MASTER; must be paired with 7133LA45JI8 in width-expanded systems | Use exclusively as companion SLAVE in multi-chip 32-bit+ configurations; not a functional substitute |
Compared with CY7C1362V-45AXC and IDT7143LA45JI8, the 7133LA45JI8 uniquely integrates arbitration logic and BUSY output functionality - essential for deterministic, glueless dual-CPU memory sharing without external control logic.
Availability
7133LA45JI8 is available at Aetrix Electronics and suitable for real-time motion control, digital signal processing buffers, redundant industrial PLC memory, and avionics system state sharing requiring stable component supply across extended product lifecycles.
Supply support for 7133LA45JI8 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 timing, memory interface, and RF solutions, now part of Renesas Electronics.
The IDT7133/7143 family was designed specifically for deterministic, low-latency dual-processor memory sharing in industrial automation, aerospace, and telecommunications infrastructure - prioritizing hardware arbitration and battery backup over density or cost.
FAQ
What is the function of the BUSY pin on the 7133LA45JI8?
The BUSY pin on the 7133LA45JI8 is an open-drain output that signals port contention when both left and right ports attempt to access the same memory address simultaneously. It stalls the contending port's write operation until the first access completes. Because it is open-drain, the 7133LA45JI8 requires an external pull-up resistor on BUSYL and BUSYR to assert HIGH when inactive. This hardware arbitration eliminates software-based locking mechanisms.
Can the 7133LA45JI8 operate with a 3.3 V supply?
No, the 7133LA45JI8 is specified only for 5.0 V ±10% (4.5 V to 5.5 V) operation and is TTL-compatible. It does not support 3.3 V logic levels or supply voltage. Using 3.3 V will result in undefined behavior, including unreliable read/write operations, excessive leakage current, and potential data corruption. Level-shifting circuitry is required for interfacing with 3.3 V systems.
How does the 7133LA45JI8 support battery backup operation?
The 7133LA45JI8 supports battery backup by retaining stored data at VCC = 2.0 V minimum, drawing only 100–4000 µA in data retention mode depending on grade. This allows connection to a backup lithium cell or supercapacitor to preserve critical state during main power failure. The 7133LA45JI8 enters retention mode automatically when CE is deasserted and VCC drops to 2 V while maintaining valid address and control inputs.
Is the 7133LA45JI8 pin-compatible with the IDT7143LA45JI8?
Yes, the 7133LA45JI8 and IDT7143LA45JI8 share identical pinouts and package dimensions (68-pin PLCC), enabling PCB layout reuse. However, their BUSY pin functionality differs fundamentally: 7133LA45JI8 drives BUSY as an output (MASTER), while IDT7143LA45JI8 receives BUSY as an input (SLAVE). Swapping them without redesigning the BUSY routing will cause functional failure.
What is the significance of "LA" in the 7133LA45JI8 part number?
The "LA" in 7133LA45JI8 denotes the Low-Power Advanced version of the IDT7133, optimized for reduced active and standby power consumption (1050 mW active / 1 mW standby typical) and enhanced battery backup capability (2 V data retention). It contrasts with the "SA" (Standard Active) variant, which consumes more power (1150 mW active / 5 mW standby) and lacks guaranteed 2 V retention. The "45" specifies 45 ns maximum access time.
7133LA45JI8 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:
- 45ns
- Access Time:
- 45 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)
7133LA45JI8 FAQ
1.How can I place an order for 7133LA45JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7133LA45JI8 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 7133LA45JI8 reliable?
The price and inventory of 7133LA45JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7133LA45JI8 is usually 5 days.
3.What payment methods are accepted for 7133LA45JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7133LA45JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7133LA45JI8?
7133LA45JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7133LA45JI8 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 7133LA45JI8?
For technical support, including 7133LA45JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7133LA45JI8 requirements.
6.How does Aetrix verify that 7133LA45JI8 is sourced from the original manufacturer or authorized distributors?
All 7133LA45JI8 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 7133LA45JI8 meets industry standards.
7.What is the process for return or replacement of 7133LA45JI8?
All 7133LA45JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7133LA45JI8, 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 7133LA45JI8 part is unused and in its original packaging.
Return procedure for 7133LA45JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7133LA45JI8 Tags
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