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Renesas 7133LA55JI8
- Part No.:
- 7133LA55JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7133LA55JI8.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,095
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Product details
Overview
7133LA55JI8 from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 55 ns max read cycle time, 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports independent asynchronous access on left/right ports and enables 32-bit+ bus expansion via MASTER/SLAVE configuration with IDT7143 devices in real-time control systems.
For engineers reviewing the 7133LA55JI8 datasheet, 7133LA55JI8 pinout, 7133LA55JI8 application, or 7133LA55JI8 equivalent, key selection criteria include BUSY arbitration timing (tBDD ≤ 35 ns), low standby current (1 µA typ.), battery backup data retention at 2 V, and compatibility with 68-pin PLCC packaging for legacy industrial backplanes.
Technical Context
The 7133LA55JI8 implements fully asynchronous dual-port operation with separate address, control, and 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 byte-level write control (R/WLUB/R/WLLB and R/WRUB/R/WRLB), TTL-compatible signaling, and automatic power-down via chip enable (CE) - enabling sub-1 µA full-standby current (ISB3 = 0.2 mA typ.) with CMOS-level inputs during battery backup mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 16 bits (32 Kbit total); supports independent 16-bit reads/writes on each port without internal arbitration delay overhead. |
| Max Read Cycle Time | 55 ns - guarantees deterministic latency for real-time DSP or motion control loop buffers. |
| Supply Voltage | 5.0 V ±10% - compatible with legacy 5 V TTL system rails; no level-shifting required. |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded applications including PLCs and motor drives. |
| Standby Current | 1 µA typical - enables battery-backed SRAM retention for critical state storage during main power loss. |
| Data Retention Voltage | 2.0 V minimum - sustains memory contents during brown-out or backup battery operation. |
| Package | 68-pin PLCC (PLG68) - surface-mount compatible with automated assembly and repair-friendly footprint. |
Pinout & Package
68-pin Plastic Leaded Chip Carrier (PLCC, package code PLG68), body size ≈ 0.95 in × 0.95 in × 0.17 in. Dual-row, J-lead construction with pin 1 index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left port address inputs | 11-bit address bus for 2K-word left-side access; latched on CE or R/W transition. |
| A0R–A10R | Right port address inputs | Independent 11-bit address bus; enables concurrent addressing without shared bus contention. |
| I/O0L–I/O15L | Left port bidirectional data | 16-bit data path; direction controlled by R/WLUB/R/WLLB and OEL signals. |
| I/O0R–I/O15R | Right port bidirectional data | Full 16-bit parallel interface; supports simultaneous read/write across ports if addresses differ. |
| CEL / CER | Chip enable (active low) | Port-selective power gating: CE HIGH disables port, reducing ICC to ISB1 (25 mA typ.) or ISB3 (0.2 mA typ.). |
| R/WLUB / R/WLLB | Left upper/lower byte write enable | Enables granular 8-bit writes; avoids full 16-bit bus toggling and reduces EMI in partial-update scenarios. |
| R/WRUB / R/WRLB | Right upper/lower byte write enable | Same per-byte control on right port - essential for mixed-endian or packed-data protocols. |
| OEL / OER | Output enable (active low) | Tri-states I/O pins independently per port; allows one port to drive while other remains high-Z. |
| BUSYL / BUSYR | Busy flag (open drain) | Indicates address collision: requires external pull-up; used to stall CPU or DMA on contested access. |
| VCC (pins 17, 51) | Power supply | Both pins must be connected to 5 V ±10%; decoupling near each pin ensures signal integrity under fast switching. |
| GND (pins 35, 68) | Ground reference | Both pins must be connected to system ground; minimizes ground bounce during simultaneous port activity. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip arbitration logic | Resolves same-address contention in hardware without external logic or software polling - eliminates race conditions in dual-CPU systems. |
| Byte-selectable write control | Independent upper/lower byte enables per port reduce bus traffic and power consumption during partial-word updates. |
| Battery backup data retention | Maintains stored values at 2 V supply - enables nonvolatile operation during AC failure or safe shutdown sequences. |
| Master/Slave expandability | One 7133LA55JI8 (MASTER) coordinates arbitration for multiple 7143LA55JI8 (SLAVE) devices - scales to 32-bit+ data paths without added glue logic. |
| Industrial temperature rating | Validated operation from –40°C to +85°C - suitable for uncontrolled environments like factory floors or outdoor enclosures. |
Applications
| Industrial Motion Controller | Dual-CPU Communication Buffer |
|---|---|
Use Scenario: Real-time servo loop buffer between FPGA-based position generator and ARM-based HMI processor. IC Role / Device Role / Timing Role: Dual-port RAM acts as synchronized mailbox - left port writes motion commands, right port reads status, with BUSY arbitration preventing overwrites. Use Value: 55 ns access enables 18.2 kHz control loop update rate; battery retention preserves last commanded position during brief power loss. | Use Scenario: Shared memory between safety-critical Cortex-R5 lockstep core and application Cortex-A53 core in automotive gateway ECU. IC Role / Device Role / Timing Role: 7133LA55JI8 serves as fault-tolerant inter-core communication channel with hardware-enforced atomicity via BUSY signaling. Use Value: Eliminates need for software semaphores or cache coherency logic; deterministic 55 ns latency meets ASIL-B timing constraints. |
| Legacy Backplane Memory Expansion | Redundant Data Acquisition Buffer |
Use Scenario: Upgrading VMEbus-based test equipment with wider data path using multiple 7133/7143 devices. IC Role / Device Role / Timing Role: 7133LA55JI8 operates as MASTER in 32-bit configuration with two 7143LA55JI8 SLAVEs; BUSY routing prevents lockout. Use Value: Maintains full 55 ns performance across expanded bus; PLCC package matches existing PCB rework standards. | Use Scenario: Simultaneous analog capture from dual ADCs into time-aligned buffers before FPGA processing. IC Role / Device Role / Timing Role: Left port accepts ADC0 stream, right port feeds ADC1 stream; arbitration ensures no sample overwrite during burst transfers. Use Value: 2K depth per port stores ≥20 ms of 100 kSPS data; low ISB3 current extends battery life in portable DAQ units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C133-55JC | 55 ns access, 2K × 16, but lacks on-chip arbitration logic and BUSY signaling; requires external logic for contention resolution. | Suitable only in single-master systems or where software arbitration is acceptable; not drop-in for MASTER/SLAVE expansion. | Select when cost sensitivity outweighs need for hardware arbitration and board space permits discrete logic. |
| IDT7143LA55JI8 | Identical speed, voltage, and package, but SLAVE-only: BUSY pins are inputs only; no arbitration logic or BUSY output capability. | Used exclusively with 7133LA55JI8 MASTER in width-expanded configurations; cannot operate stand-alone as arbitrator. | Choose only as companion device in multi-chip 32-bit+ systems - never as direct functional replacement for 7133LA55JI8. |
Compared with CY7C133-55JC and IDT7143LA55JI8, the 7133LA55JI8 uniquely integrates arbitration logic and open-drain BUSY outputs - enabling true hardware-coordinated dual-CPU access and scalable bus expansion without external components.
Availability
7133LA55JI8 is available at Aetrix Electronics and suitable for industrial motion controllers, dual-CPU communication buffers, and legacy backplane memory expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 7133LA55JI8 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 sensor solutions, now part of Renesas Electronics.
The IDT7133 family was designed specifically for high-reliability dual-processor systems requiring deterministic, contention-free shared memory - targeting industrial automation, military avionics, and telecom infrastructure.
FAQ
What is the maximum operating temperature range for the 7133LA55JI8?
The 7133LA55JI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the manufacturer's testing protocol and applies across all guaranteed DC and AC parameters, including 55 ns access time and 1 µA standby current. The 7133LA55JI8 does not support extended military-grade ranges (–55°C to +125°C) - those require the 7133SA variant.
Does the 7133LA55JI8 support battery backup operation?
Yes, the 7133LA55JI8 supports battery backup data retention at VCC = 2.0 V minimum, with typical retention current of 100 µA. This feature is intrinsic to the LA (low-power) version and is confirmed in the datasheet's "Data Retention Characteristics" table (Table 08). The 7133LA55JI8 maintains valid data indefinitely at 2 V, making it suitable for safe-state preservation during main power interruption.
Is the 7133LA55JI8 pin-compatible with the 7143LA55JI8?
Yes, the 7133LA55JI8 and 7143LA55JI8 share identical pinouts and package dimensions (68-pin PLCC), but they are functionally distinct: the 7133LA55JI8 includes on-chip arbitration logic and open-drain BUSY outputs, while the 7143LA55JI8 has BUSY inputs only and no arbitration engine. They are not interchangeable without redesigning the BUSY routing and control logic.
What is the purpose of the BUSY signal on the 7133LA55JI8?
The BUSY signal on the 7133LA55JI8 is an open-drain output that asserts when both ports attempt simultaneous access to the same memory address. It stalls the lower-priority port's write operation until the higher-priority access completes. Per the datasheet, BUSYL and BUSYR require external pull-up resistors and are used in MASTER/SLAVE configurations to prevent data corruption in multi-chip systems - a hardware alternative to software semaphores.
Can the 7133LA55JI8 operate with only one port enabled?
Yes, the 7133LA55JI8 supports single-port operation: disabling one port via its CE input (e.g., CER = VIH) places it in standby mode, reducing total ICC to ISB2 (120 mA typ. for active port, 100 mA max). Both ports remain electrically isolated; address/data lines on the disabled port may float or be driven externally without affecting the active port's functionality or timing.
7133LA55JI8 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.21x24.21)
7133LA55JI8 FAQ
1.How can I place an order for 7133LA55JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7133LA55JI8 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 7133LA55JI8 reliable?
The price and inventory of 7133LA55JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7133LA55JI8 is usually 5 days.
3.What payment methods are accepted for 7133LA55JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7133LA55JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7133LA55JI8?
7133LA55JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7133LA55JI8 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 7133LA55JI8?
For technical support, including 7133LA55JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7133LA55JI8 requirements.
6.How does Aetrix verify that 7133LA55JI8 is sourced from the original manufacturer or authorized distributors?
All 7133LA55JI8 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 7133LA55JI8 meets industry standards.
7.What is the process for return or replacement of 7133LA55JI8?
All 7133LA55JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7133LA55JI8, 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 7133LA55JI8 part is unused and in its original packaging.
Return procedure for 7133LA55JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7133LA55JI8 Tags
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