Renesas 7133SA55JI

Overview

7133SA55JI from IDT is a high-speed 2K × 16 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 55 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables error-free 32-bit-or-wider memory expansion when paired with IDT7143 SLAVE devices in real-time embedded control systems requiring concurrent CPU/DSP access.

For engineers reviewing the 7133SA55JI datasheet, 7133SA55JI pinout, 7133SA55JI application, or 7133SA55JI equivalent, this page delivers verified timing parameters, BUSY arbitration behavior, byte-select write control, battery backup capability (2V data retention), and package-specific pin mapping for reliable system integration.

Technical Context

The 7133SA55JI implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses - enabling simultaneous read/write operations without internal synchronization. Its on-chip arbitration logic resolves port contention via open-drain BUSYL/BUSYR outputs that assert during same-address access, gating writes on the losing port.

As a MASTER device, it supports width expansion: BUSY output drives IDT7143 SLAVE BUSY inputs, eliminating "busy lock-out" in multi-chip configurations. The device features separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB) and operates with single 5V supply, supporting battery backup down to 2V for data retention.

Key Specifications

Pinout & Package

7133SA55JI is packaged in a 68-pin PLCC (PLG68) with 0.05-inch lead pitch and 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 CY7C133-55JC and IDT7143SA55JI, the 7133SA55JI uniquely integrates arbitration logic and open-drain BUSY outputs - enabling drop-in deployment in real-time systems where deterministic contention resolution is mandatory and external glue logic must be minimized.

Availability

7133SA55JI is available at Aetrix Electronics and suitable for industrial automation, avionics subsystems, and test equipment requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7133SA55JI 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, and RF solutions, now part of Renesas Electronics.

The IDT7133/7143 family was designed specifically for real-time embedded systems requiring deterministic dual-ported memory access - targeting military, industrial, and communications applications demanding hardware arbitration and seamless width scalability.

FAQ

What is the function of the BUSY pins on the 7133SA55JI?

The BUSYL and BUSYR pins on the 7133SA55JI are open-drain outputs that signal port contention when both ports attempt access to the same memory location simultaneously. When asserted, they gate write operations on the contending port, ensuring deterministic arbitration. External pull-up resistors are required, and these signals drive IDT7143 SLAVE devices in width-expanded systems.

Does the 7133SA55JI support battery backup operation?

Yes, the 7133SA55JI supports battery backup operation with guaranteed data retention at VCC = 2.0 V minimum. In this mode, standby current is typically 5 µA, enabling long-term memory preservation during main power loss - critical for applications like test equipment state recovery and avionics black-box logging.

Can the 7133SA55JI be used without external arbitration logic?

Yes - the 7133SA55JI contains fully integrated arbitration logic and does not require external components to resolve port contention. Its on-chip BUSY generation and write-gating eliminate the need for discrete logic or software semaphores, making it ideal for hard real-time systems where latency predictability is essential.

What is the difference between 7133SA55JI and 7143SA55JI?

The 7133SA55JI is the MASTER device with on-chip arbitration logic and BUSY outputs; the 7143SA55JI is the SLAVE device with BUSY inputs only and no arbitration circuitry. They share identical pinout and timing but serve complementary roles: 7133SA55JI manages contention, while 7143SA55JI extends data bus width under its control.

Which package type is used for the 7133SA55JI part number ending in 'JI'?

The 'JI' suffix in 7133SA55JI denotes the 68-pin PLCC (Plastic Leaded Chip Carrier) package, also referenced as PLG68. This package features gull-wing leads, JEDEC-standard footprint, and is qualified for industrial temperature operation - distinct from PGA, flatpack, or TQFP variants offered in the same family.