Renesas 7133LA35J8

Overview

7133LA35J8 from IDT is a high-speed 2K × 16 (4,096-word × 16-bit) dual-port static RAM with master arbitration logic, 35 ns maximum read cycle time, 1.0 mA typical full-standby current, and battery backup data retention at 2 V. It operates on a single 5.0 V ±10% supply and supports independent asynchronous access from left and right ports in industrial temperature range (–40°C to +85°C). Used in real-time interprocessor communication and shared-memory embedded systems.

For engineers reviewing the 7133LA35J8 datasheet, 7133LA35J8 pinout, 7133LA35J8 application, or 7133LA35J8 equivalent, this page delivers verified timing parameters, port arbitration behavior, byte-select write control, BUSY flag operation, and package-specific I/O mapping - all confirmed for the exact 7133LA35J8 variant with LA (low-power) and 35 ns speed grade in 68-pin PLCC (J8).

Technical Context

The 7133LA35J8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves contention when both ports access the same memory location simultaneously, asserting open-drain BUSYL/BUSYR outputs to stall the losing port.

It supports byte-level write enable (R/WLUB/R/WLLB for left port; R/WRUB/R/WRLB for right port), TTL-compatible signaling, and automatic power-down via chip enable (CEL/CER). The LA version reduces active power to 1050 mW typ. and enables 2 V data retention with ≤100 µA retention current.

Key Specifications

Pinout & Package

7133LA35J8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), designated by suffix "J8". The package is leaded, surface-mountable, and RoHS-compliant (green part). Pin 1 is marked by a corner notch; body size is approx. 24.13 mm × 24.13 mm × 3.3 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with 7133LA35J8, the 7133SA35J8 trades power efficiency for marginally higher active drive strength, while 7143LA35J8 removes arbitration capability entirely - making it a functional subset requiring architectural redesign for standalone use.

Availability

7133LA35J8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal processing buffers, and industrial PLC shared memory requiring stable component supply across extended product lifecycles.

Supply support for 7133LA35J8 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, now part of Renesas Electronics.

The IDT7133 family was designed specifically for deterministic, low-latency shared-memory architectures in embedded control, test equipment, and communications infrastructure - emphasizing hardware arbitration, byte-select flexibility, and industrial reliability.

FAQ

What is the function of the BUSY pins on the 7133LA35J8?

The BUSYL and BUSYR pins on the 7133LA35J8 are open-drain outputs that signal port contention when both ports attempt to access the same memory address simultaneously. When asserted, they stall the losing port's write operation. External pull-up resistors are required. This hardware arbitration eliminates race conditions without software intervention - a core feature distinguishing the 7133LA35J8 from slave-only variants like 7143LA35J8.

Does the 7133LA35J8 support true 2 V data retention, and what is the maximum current draw in that mode?

Yes, the 7133LA35J8 supports guaranteed data retention at VCC = 2.0 V, as specified in Table 8 of the datasheet. In this mode, with CE high and inputs held at valid logic levels, the typical retention current is 100 µA, with a maximum of 4000 µA over military temperature range. This enables integration with small backup batteries or supercapacitors in power-fail scenarios.

Can the 7133LA35J8 operate with only one port enabled while the other remains inactive?

Yes, the 7133LA35J8 supports asymmetric operation: either port can be independently enabled or disabled via its dedicated chip enable (CEL or CER). When one port is disabled (CE = VIH), it enters full standby mode drawing ≤0.2 mA (ISB3), while the active port continues normal read/write operations with full 35 ns timing performance - ideal for asymmetric processing workloads.

What is the significance of the "J8" suffix in 7133LA35J8?

The "J8" suffix in 7133LA35J8 denotes the 68-pin Plastic Leaded Chip Carrier (PLCC) package with standard lead finish and RoHS compliance. It is distinct from other packages like GU68 (ceramic PGA), FP68 (flatpack), or PNG100 (100-pin TQFP). Pin compatibility is maintained across all 7133/7143 variants in the same package type, but electrical and thermal characteristics differ slightly between PLCC and ceramic options.

How does the 7133LA35J8 handle simultaneous writes to the same address from both ports?

The 7133LA35J8 uses on-chip arbitration logic to resolve simultaneous same-address writes: the port meeting the arbitration priority setup time (tAPS ≥ 5 ns) wins and completes its write; the losing port has its write signal gated internally, and its BUSY pin is asserted. This prevents data corruption and provides deterministic, hardware-enforced serialization - a key differentiator from non-arbitrated dual-port memories.