Renesas 7133LA45J8

Overview

7133LA45J8 from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 45 ns maximum read cycle time, 2V data retention capability, and industrial temperature range (–40°C to +85°C). It supports independent asynchronous access from left and right ports and is used in real-time interprocessor communication systems requiring deterministic contention resolution.

For engineers reviewing the 7133LA45J8 datasheet, 7133LA45J8 pinout, 7133LA45J8 application, or 7133LA45J8 equivalent, this page delivers verified timing parameters, BUSY arbitration behavior, byte-select write control, power-down modes, and package-specific pin mapping for 68-pin PLCC (J8 suffix).

Technical Context

The 7133LA45J8 implements on-chip port arbitration logic exclusively in MASTER mode, generating open-drain BUSYL/BUSYR outputs that require external pull-up resistors. Its dual independent ports feature separate CE, R/W, OE, address, and I/O lines - enabling full asynchronous operation without external glue logic.

It supports battery backup operation at VCC = 2V with typical data retention current of 100 µA (industrial grade), and uses TTL-compatible 5V ±10% supply. The LA variant reduces active power to 1050 mW (typ.) and standby to 1 mW (typ.), versus SA versions.

Key Specifications

Pinout & Package

7133LA45J8 is packaged in a 68-pin PLCC (Plastic Leaded Chip Carrier) with body size ≈ 0.95 in × 0.95 in × 0.17 in. Both VCC and GND pins must be connected for reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 7133LA45J8, the 7133LA55J8 trades 10 ns speed for lower dynamic power and reduced signal integrity risk, while the 7143LA45J8 removes arbitration to serve strictly as a slave device - making it unsuitable for single-chip dual-CPU interfaces but essential for scalable wide-bus architectures.

Availability

7133LA45J8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, avionics health monitoring, and redundant flight control systems requiring stable component supply, long-term obsolescence management, and industrial-grade reliability.

Supply support for 7133LA45J8 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, and interface solutions for communications, computing, and industrial markets.

The IDT7133 family was designed specifically for deterministic dual-processor shared-memory architectures - emphasizing hardware arbitration, low-latency access, and robustness in harsh thermal and power environments.

FAQ

What is the meaning of the 'J8' suffix in 7133LA45J8?

The J8 suffix denotes the 68-pin PLCC (Plastic Leaded Chip Carrier) package variant of the 7133LA45J8. This package has a body size of approximately 0.95 in × 0.95 in × 0.17 in and is surface-mount compatible with standard reflow profiles. All electrical and timing specifications remain identical across J8 (PLCC), JG (PGA), and QF (TQFP) variants - only mechanical form factor differs.

Does 7133LA45J8 support true simultaneous read/write operations on both ports?

Yes, 7133LA45J8 supports fully asynchronous read and write operations on left and right ports - provided they target different memory addresses. When both ports access the same address concurrently, on-chip arbitration asserts BUSYL or BUSYR to stall the lower-priority port. The 7133LA45J8's MASTER logic ensures deterministic resolution without external logic.

How is data retention implemented in 7133LA45J8, and what is the minimum VCC required?

7133LA45J8 implements data retention by maintaining memory cell state at VCC = 2.0 V minimum, drawing ≤4000 µA (industrial grade) in this mode. The LA variant's ultra-low standby current (1 mW typ.) enables seamless transition from active operation to battery-backed retention without software intervention - critical for avionics black-box logging.

Can 7133LA45J8 be used without external pull-up resistors on BUSY pins?

No - the BUSYL and BUSYR pins on 7133LA45J8 are open-drain outputs and require external pull-up resistors to VCC (typically 4.7 kΩ) to generate valid HIGH-level busy signals. Without pull-ups, BUSY remains floating and cannot drive downstream logic or interrupt controllers reliably. This requirement is explicitly stated in the functional block diagram and pin description sections.

Is 7133LA45J8 pin-compatible with the SA version (e.g., 7133SA45J8)?

Yes, 7133LA45J8 is fully pin-compatible and functionally identical to 7133SA45J8 in all respects except power characteristics: the LA version reduces active power to 1050 mW (typ.) and standby to 1 mW (typ.), versus 1150 mW/5 mW for SA. Timing parameters, pinout, voltage ratings, and arbitration behavior are identical - enabling direct substitution where thermal or battery life is constrained.