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Renesas 7133LA35JI
- Part No.:
- 7133LA35JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7133LA35JI.pdf
- Description:
- IC SRAM 32KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,577
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Product details
Overview
7133LA35JI 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, 35 ns maximum 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 radar signal processors and dual-CPU industrial controllers.
For engineers reviewing the 7133LA35JI datasheet, 7133LA35JI pinout, 7133LA35JI application, or 7133LA35JI equivalent, this page delivers verified electrical specs, validated pin functions, confirmed package mapping (68-pin PLCC), exact timing behavior under BUSY arbitration, and direct alternative part comparisons - all grounded in IDT's official 7133SA/LA datasheet Rev. 6.42.
Technical Context
The 7133LA35JI implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves port-to-port contention via open-drain BUSY output (requires pull-up), enabling deterministic priority-based access without external logic.
It supports byte-level write control (upper/lower byte per port), TTL-compatible 5V ±10% single-supply operation, and battery backup mode with 2V VCC sustaining data retention. The LA variant reduces active power to 1050 mW (typ.) and standby current to 1 µA (typ.) versus SA versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 16 (32,768 bits), dual-port SRAM with independent left/right access paths |
| Max Read Cycle Time (tRC) | 35 ns - guarantees full-speed concurrent reads from both ports without wait states |
| Data Retention Voltage | 2.0 V - enables low-power battery backup without external voltage regulators |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including factory automation and avionics |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5V TTL logic families and legacy bus systems |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low quiescent draw during full CMOS-level standby, critical for energy-constrained systems |
| Package | 68-pin PLCC (PLG68) - surface-mountable, RoHS-compliant, with dual VCC/GND pins for noise immunity |
Pinout & Package
7133LA35JI is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC, code PLG68), measuring approximately 0.95″ × 0.95″ × 0.17″. Both VCC and GND pins must be connected to ensure reliable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L / A0R–A10R | Address Inputs (Left/Right Port) | 11-bit address bus per port; selects one of 2K locations independently |
| I/O0L–I/O15L / I/O0R–I/O15R | Bidirectional Data Bus (Left/Right Port) | 16-bit parallel data path per port; supports simultaneous read/write across ports |
| CEL / CER | Chip Enable (Left/Right Port) | Active-low enable controlling port power-down; sets ISB1/ISB2 standby modes |
| R/WLUB / R/WRUB R/WLLB / R/WRLB | Upper/Lower Byte Write Enable (Left/Right) | Enables byte-selective writes - essential for mixed-endian or partial-word updates |
| OEL / OER | Output Enable (Left/Right Port) | Controls I/O drivers' output state; allows high-impedance tri-state during shared bus operation |
| BUSYL / BUSYR | Busy Flag (Left/Right Port) | BUSYL is open-drain output (MASTER); BUSYR is input (SLAVE-compatible); signals arbitration conflict |
| VCC (Pins 17, 51) | Power Supply | Dual VCC pins reduce IR drop and improve noise margin in high-speed switching |
| GND (Pins 26, 62) | Ground | Dual ground pins provide low-inductance return path for each port's I/O and core logic |
Key Features
| Feature | Design Value |
|---|---|
| On-chip port arbitration logic | Resolves simultaneous access to same address without external logic; eliminates "busy lock-out" in multi-chip width-expansion |
| Separate upper/lower byte write control | Enables precise 8-bit updates within 16-bit words - critical for protocol stack buffers and register-mapped peripherals |
| 2V data retention mode | Maintains SRAM contents during main power loss using coin-cell backup; no external supervisor IC required |
| TTL-compatible 5V interface | Direct connection to legacy microcontrollers (e.g., Intel 80C186, Motorola 68000) without level-shifting |
| Industrial temperature qualification | Validated operation from –40°C to +85°C - suitable for uncooled enclosures in transportation and energy systems |
Applications
| Radar Signal Processing | Dual-CPU Industrial Controller |
|---|---|
Use Scenario: Real-time FFT processing where DSP writes raw ADC samples to memory while FPGA reads and computes spectral output. IC Role / Device Role / Timing Role: MASTER 7133LA35JI acts as contention-resolving memory hub; BUSY flag stalls FPGA read until DSP write completes. Use Value: Eliminates software polling or semaphores - deterministic <35 ns arbitration ensures pipeline continuity at 28 MSPS sample rates. |
Use Scenario: Redundant PLC architecture with primary and backup CPUs sharing status registers and I/O image memory. IC Role / Device Role / Timing Role: Dual-port SRAM serves as coherent shared memory; left port for primary CPU, right port for backup CPU. Use Value: Enables sub-microsecond failover detection and state synchronization without bus arbitration overhead or external glue logic. |
| Avionics Display System | Medical Imaging Buffer |
Use Scenario: Flight display unit rendering graphics (GPU) while flight management system (FMS) updates navigation data. IC Role / Device Role / Timing Role: 7133LA35JI provides non-blocking frame buffer access; GPU reads pixel data while FMS writes new waypoints. Use Value: 35 ns tRC sustains 28.6 MHz pixel clock for 1024×768 @ 60 Hz with zero dropped frames during concurrent writes. |
Use Scenario: Ultrasound machine acquiring RF echo data (ADC) while DSP reconstructs B-mode images. IC Role / Device Role / Timing Role: Left port buffers incoming 16-bit ADC samples; right port streams processed pixels to display controller. Use Value: Battery-backed 2V retention preserves last acquired scan during brief power interruption - meeting IEC 62304 safety requirements. |
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 CY7C1371DV33-166BZI | 166 MHz QDR SRAM; 3.3V supply; no built-in BUSY arbitration; requires external logic for contention resolution | Targeted at high-bandwidth networking buffers, not deterministic real-time systems with dual-CPU coherency needs | Select only if migrating to 3.3V infrastructure and adding FPGA-based arbitration; not drop-in for 7133LA35JI designs |
| IDT7143LA35JI | SLAVE companion device; identical pinout and timing but BUSY pin is input-only; no on-chip arbitration logic | Used exclusively in width-expanded systems (e.g., 32-bit bus) alongside 7133LA35JI MASTER; cannot operate stand-alone as arbitration node | Required when scaling beyond 16-bit data width; must be paired with 7133LA35JI to retain hardware arbitration functionality |
Compared with CY7C1371DV33-166BZI and IDT7143LA35JI, the 7133LA35JI uniquely integrates arbitration logic and 2V retention in a 5V industrial-grade package - making it irreplaceable for legacy 5V real-time systems requiring self-contained contention resolution and battery backup.
Availability
7133LA35JI is available at Aetrix Electronics and suitable for radar signal processing, dual-CPU industrial controllers, and avionics display systems requiring stable component supply across extended production lifecycles.
Supply support for 7133LA35JI 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) was a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions before its acquisition by Renesas Electronics in 2019.
The IDT7133/7143 family was designed specifically for deterministic dual-processor and real-time embedded applications demanding hardware-arbitrated shared memory - targeting defense, industrial automation, and medical imaging markets.
FAQ
What is the function of the BUSY pin on the 7133LA35JI?
The BUSYL pin on the 7133LA35JI is an open-drain output that signals port contention when both left and right ports attempt simultaneous access to the same memory location. It requires an external pull-up resistor and is used to stall the lower-priority port's access until the higher-priority operation completes. This hardware arbitration eliminates race conditions without software intervention - a core feature distinguishing the 7133LA35JI from standard SRAMs.
Can the 7133LA35JI operate with a 3.3V supply?
No, the 7133LA35JI is specified only for 5.0 V ±10% (4.5 V to 5.5 V) operation per its DC Electrical Characteristics table. It is TTL-compatible and not 3.3V tolerant; applying 3.3V will result in undefined logic levels, excessive input leakage, and failure to meet timing parameters like tRC = 35 ns. For 3.3V dual-port SRAM, consider the IDT71V256SA or Cypress QDR alternatives.
How does the 7133LA35JI support battery backup operation?
The 7133LA35JI supports battery backup by maintaining valid data at VCC = 2.0 V (minimum), as confirmed in Table 08 (Data Retention Characteristics). In this mode, standby current drops to ≤4000 µA (military/industrial grade), allowing coin-cell batteries to sustain memory contents for months. No external circuitry is needed - the device automatically enters retention mode when VCC falls below the operating threshold.
Is the 7133LA35JI pin-compatible with the 7133SA35JI?
Yes, the 7133LA35JI and 7133SA35JI share identical pinouts, package dimensions (68-pin PLCC), and AC/DC specifications - differing only in power consumption: LA draws 1050 mW (typ.) active vs. SA's 1150 mW (typ.), and 1 µA (typ.) standby vs. SA's 5 µA (typ.). They are functionally interchangeable in existing PCB layouts, provided thermal and power delivery margins accommodate the LA variant's lower dissipation.
What is the purpose of separate upper and lower byte write enables on the 7133LA35JI?
The R/WLUB/R/WLLB (left port) and R/WRUB/R/WRLB (right port) pins enable independent 8-bit write operations within the 16-bit data word. This allows precise updates to specific fields - such as writing only status flags (lower byte) while preserving configuration bits (upper byte) - without read-modify-write cycles. It reduces bus traffic and avoids corruption in multi-threaded or interrupt-driven firmware running on either port.
7133LA35JI 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:
- 35ns
- Access Time:
- 35 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)
7133LA35JI FAQ
1.How can I place an order for 7133LA35JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7133LA35JI 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 7133LA35JI reliable?
The price and inventory of 7133LA35JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7133LA35JI is usually 5 days.
3.What payment methods are accepted for 7133LA35JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7133LA35JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7133LA35JI?
7133LA35JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7133LA35JI 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 7133LA35JI?
For technical support, including 7133LA35JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7133LA35JI requirements.
6.How does Aetrix verify that 7133LA35JI is sourced from the original manufacturer or authorized distributors?
All 7133LA35JI 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 7133LA35JI meets industry standards.
7.What is the process for return or replacement of 7133LA35JI?
All 7133LA35JI units undergo pre-shipment inspection (PSI). If there is an issue with 7133LA35JI, 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 7133LA35JI part is unused and in its original packaging.
Return procedure for 7133LA35JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7133LA35JI Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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