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Renesas 7133SA25JI
- Part No.:
- 7133SA25JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7133SA25JI.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,210
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Product details
Overview
7133SA25JI from IDT is a high-speed 2K × 16 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 25 ns maximum access time (industrial temperature range), open-drain BUSY output requiring pull-up, and TTL-compatible 5V ±10% operation - used in real-time inter-processor communication systems requiring concurrent read/write access without external arbitration.
For engineers reviewing the 7133SA25JI datasheet, 7133SA25JI pinout, 7133SA25JI application, or 7133SA25JI equivalent, this page delivers verified timing parameters, byte-selectable write control per port, battery backup data retention capability (2V), industrial-grade thermal performance (–40°C to +85°C), and precise MASTER/SLAVE expansion architecture for 32-bit+ bus width systems.
Technical Context
The 7133SA25JI implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves contention when both ports access the same memory location, asserting BUSYL/BUSYR to stall the lower-priority port.
As a MASTER device, it features open-drain BUSY outputs (requiring external pull-up) and supports width expansion with SLAVE IDT7143 devices via BUSY-driven write inhibition. It does not support BUSY input mode - that function is exclusive to IDT7143 SLAVE variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 16 bits (32,768 bits total); enables compact dual-access buffer storage in space-constrained embedded controllers. |
| Access Time | 25 ns (max) at VCC = 5.0 V ±10%, TA = –40°C to +85°C; guarantees deterministic latency for hard real-time inter-CPU handshaking. |
| Supply Voltage | 4.5 V to 5.5 V DC; compatible with standard TTL logic rails and eliminates need for dedicated low-noise LDO in 5V systems. |
| Standby Current | 25 mA (typ) with TTL-level CE inputs; supports low-power idle states during CPU polling intervals without external power gating. |
| Data Retention | 2 V minimum VCC; allows battery-backed operation using single-cell lithium or coin-cell sources for nonvolatile state preservation. |
| Operating Temperature | –40°C to +85°C (industrial grade); qualified for deployment in automotive engine control units and industrial PLC backplanes. |
| Package | 68-pin PLCC (PLG68); surface-mount compatible with automated assembly and provides robust thermal/mechanical stability. |
Pinout & Package
7133SA25JI is housed in a 68-pin Plastic Leaded Chip Carrier (PLCC, package code PLG68), measuring approximately 0.95 in × 0.95 in × 0.17 in. Both VCC and GND pins must be connected to ensure reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable controlling port activation; when HIGH, respective port enters low-power standby (ISB1/ISB2 modes). |
| R/WLUB / R/WRUB | Upper Byte Read/Write Enable | Selects upper byte (I/O8–I/O15) for read or write; enables partial-word updates without disturbing lower byte contents. |
| R/WLLB / R/WRLB | Lower Byte Read/Write Enable | Selects lower byte (I/O0–I/O7); combined with upper byte control, supports true 8-bit or 16-bit granularity per port. |
| OEL / OER | Output Enable (Left / Right) | Tri-states I/O drivers when HIGH; allows shared bus operation and prevents signal contention during multi-device reads. |
| BUSYL / BUSYR | Busy Flag (Open-Drain Output) | Asserted LOW during address contention; requires external pull-up resistor; signals arbitration result to external logic or CPU interrupt line. |
| A0L–A10L / A0R–A10R | Address Inputs (Left / Right) | 11-bit address bus per port; decodes 2K locations (0x000–0x7FF); supports independent addressing sequences per port. |
| I/O0L–I/O15L / I/O0R–I/O15R | Data I/O (Left / Right) | 16-bit bidirectional data bus per port; electrically isolated between ports; no internal bus contention. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip arbitration logic | Resolves simultaneous access to identical addresses without external logic; eliminates risk of data corruption in multi-CPU systems. |
| Separate byte write control | Enables atomic 8-bit updates to upper/lower halves of 16-bit words - critical for status register shadowing and protocol field manipulation. |
| MASTER/SLAVE expansion architecture | Permits seamless 32-bit+ data bus width scaling using one 7133SA25JI MASTER and multiple IDT7143 SLAVE devices with synchronized BUSY signaling. |
| Battery backup data retention | Maintains stored data at VCC ≥ 2.0 V; supports fail-safe state capture during main power loss in safety-critical applications. |
| Industrial temperature qualification | Validated across –40°C to +85°C with full AC/DC parameter compliance; eliminates derating calculations for harsh-environment deployments. |
Applications
| Real-Time Inter-Processor Communication | Digital Signal Processor (DSP) Co-Processing Buffer |
|---|---|
|
Use Scenario: Two microcontrollers exchange sensor fusion results and actuator commands via shared memory with zero software overhead. IC Role / Device Role / Timing Role: 7133SA25JI serves as MASTER dual-port RAM with hardware arbitration, enabling lock-free concurrent read/write without polling or semaphores. Use Value: Eliminates CPU cycles spent on software mutexes; reduces inter-processor latency to ≤25 ns; ensures deterministic response in closed-loop motor control. |
Use Scenario: A host MCU offloads FFT computation to a dedicated DSP, sharing input samples and output spectra through a common memory region. IC Role / Device Role / Timing Role: 7133SA25JI acts as synchronous buffer with independent left/right ports - host writes input data while DSP reads and writes results. Use Value: Enables pipelined processing with no bus turnaround delay; supports burst transfers at full 25 ns cycle rate; avoids FIFO overflow in streaming audio analysis. |
| Redundant Control System Memory | Avionics Data Cross-Check Buffer |
|
Use Scenario: Primary and backup flight control computers maintain mirrored state variables in shared RAM to detect divergence before actuation. IC Role / Device Role / Timing Role: 7133SA25JI provides fault-tolerant dual-access storage with BUSY-driven write coordination to prevent conflicting updates. Use Value: Guarantees atomic update visibility across channels; supports MIL-PRF-38535 QML-compliant reliability; enables immediate failover upon mismatch detection. |
Use Scenario: Two independent avionics sensors feed raw telemetry into separate ports; cross-check logic compares values before forwarding validated data to display systems. IC Role / Device Role / Timing Role: 7133SA25JI functions as time-aligned dual-input buffer with simultaneous read capability for real-time comparison. Use Value: Achieves sub-50 ns synchronization window between sensor reads; supports DO-254 Level A design assurance; eliminates clock domain crossing hazards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port RAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT7143SA25JI | SLAVE-only variant; BUSY pins are inputs (not outputs); no on-chip arbitration logic; identical pinout and timing. | Used only in width-expanded systems paired with a 7133SA25JI MASTER; cannot operate standalone as arbitration controller. | Select when building 32-bit+ memory arrays where one MASTER coordinates multiple SLAVE devices. |
| Cypress CY7C136-25JC | 2K × 16 dual-port SRAM with 25 ns access; no built-in BUSY arbitration; requires external logic for contention resolution. | Suitable for simpler dual-CPU systems where software-managed access or external arbitration is acceptable. | Choose if cost sensitivity outweighs need for hardware arbitration, or when legacy Cypress toolchain compatibility is required. |
Compared with IDT7143SA25JI and CY7C136-25JC, the 7133SA25JI uniquely integrates arbitration logic and open-drain BUSY signaling - enabling drop-in replacement in MASTER roles without redesign, whereas alternatives require either companion chips or firmware changes to manage contention.
Availability
7133SA25JI is available at Aetrix Electronics and suitable for real-time inter-processor communication, redundant control system memory, and avionics data cross-check buffer applications requiring stable component supply, long-term obsolescence management, and industrial-temperature reliability.
Supply support for 7133SA25JI 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 inter-processor communication in military, industrial, and aerospace systems requiring hardware-arbitrated dual-port memory access.
FAQ
What is the operating temperature range for the 7133SA25JI?
The 7133SA25JI is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and supported by full AC/DC electrical characterization across that range. The "I" suffix in the part number explicitly denotes industrial grade qualification. The 7133SA25JI does not support commercial (0°C to +70°C) or military (–55°C to +125°C) ranges.
Does the 7133SA25JI include on-chip arbitration logic?
Yes, the 7133SA25JI includes dedicated on-chip arbitration logic - a defining feature distinguishing it from the SLAVE-only IDT7143 series. When both ports attempt to access the same memory address, the 7133SA25JI asserts BUSYL or BUSYR to stall the lower-priority port. This logic is intrinsic to the 7133SA25JI and requires no external components or configuration.
How is the BUSY signal implemented on the 7133SA25JI?
The BUSY pins (BUSYL and BUSYR) on the 7133SA25JI are open-drain outputs and require external pull-up resistors to VCC. They assert LOW during address contention to indicate arbitration status. This differs from IDT7143 SLAVE devices, where BUSY pins are inputs. The 7133SA25JI's BUSY behavior is fixed and cannot be reconfigured as an input.
Can the 7133SA25JI operate with a 2V supply for data retention?
Yes, the 7133SA25JI supports data retention at VCC = 2.0 V minimum, as specified in the Data Retention Characteristics table. This enables battery backup operation using a single Li-MnO₂ or CR2032 cell. Retention current is characterized at ≤4000 µA (military/industrial) and ≤1500 µA (commercial), ensuring multi-year hold time with typical backup sources.
What package type is used for the 7133SA25JI?
The 7133SA25JI is supplied in a 68-pin Plastic Leaded Chip Carrier (PLCC), designated PLG68 in IDT documentation. This package has a body size of approximately 0.95 in × 0.95 in × 0.17 in and is distinct from the 68-pin ceramic PGA (GU68), flatpack (FP68), and 100-pin TQFP (PNG100) variants offered in the same family.
7133SA25JI 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:
- 25ns
- Access Time:
- 25 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)
7133SA25JI FAQ
1.How can I place an order for 7133SA25JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7133SA25JI 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 7133SA25JI reliable?
The price and inventory of 7133SA25JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7133SA25JI is usually 5 days.
3.What payment methods are accepted for 7133SA25JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7133SA25JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7133SA25JI?
7133SA25JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7133SA25JI 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 7133SA25JI?
For technical support, including 7133SA25JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7133SA25JI requirements.
6.How does Aetrix verify that 7133SA25JI is sourced from the original manufacturer or authorized distributors?
All 7133SA25JI 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 7133SA25JI meets industry standards.
7.What is the process for return or replacement of 7133SA25JI?
All 7133SA25JI units undergo pre-shipment inspection (PSI). If there is an issue with 7133SA25JI, 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 7133SA25JI part is unused and in its original packaging.
Return procedure for 7133SA25JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7133SA25JI Tags
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