Renesas 7133SA45J

Overview

7133SA45J from IDT (Integrated Device Technology) is a high-speed 2K × 16-bit dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 45 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and open-drain BUSY output requiring external pull-up. It enables error-free 32-bit+ memory expansion when paired with IDT7143 SLAVE devices in real-time embedded control systems.

For engineers reviewing the 7133SA45J datasheet, 7133SA45J pinout, 7133SA45J application, or 7133SA45J equivalent, this page delivers verified timing parameters (tRC = 45 ns, tAA = 45 ns), byte-select write control (R/WLUB/R/WLLB), dual-port arbitration behavior, battery backup capability (2V data retention), and industrial temperature support (–40°C to +85°C).

Technical Context

The 7133SA45J implements fully asynchronous dual-port access with independent left/right address, control, and I/O buses - permitting concurrent reads/writes to any memory location without internal synchronization overhead. Its on-chip arbitration logic resolves port contention via BUSY flag assertion, with tBDD = 40 ns (BUSY disable to valid data) ensuring deterministic resolution timing.

As a MASTER device, it features open-drain BUSYL/BUSYR outputs (requiring pull-up resistors) and supports width expansion by driving BUSY inputs of IDT7143 SLAVE devices. The SA suffix denotes standard-power operation (1150 mW active typ., 5 mW standby typ.) optimized for commercial and industrial environments.

Key Specifications

Pinout & Package

7133SA45J is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC, package code PLG68), measuring approximately 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 IDT7143SA45J and CY7C1371DV33-166AXC, the 7133SA45J uniquely delivers on-chip arbitration, 5V TTL compatibility, and MASTER functionality - making it irreplaceable in legacy industrial dual-processor systems requiring deterministic contention resolution without FPGA logic.

Availability

7133SA45J is available at Aetrix Electronics and suitable for industrial PLCs, avionics display subsystems, and real-time signal processing buffers requiring stable component supply, long-term lifecycle support, and MIL-PRF-38535-compliant manufacturing traceability.

Supply support for 7133SA45J 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 memory, timing, and interface solutions, now part of Renesas Electronics since 2019.

The IDT7133/7143 family was designed specifically for real-time embedded systems requiring deterministic dual-processor memory sharing - emphasizing hardware arbitration, low-latency access, and industrial reliability over raw bandwidth.

FAQ

What is the function of the BUSY pins on the 7133SA45J?

The BUSYL and BUSYR pins on the 7133SA45J are open-drain outputs that assert during port contention - i.e., when both ports attempt access to the same memory address simultaneously. As a MASTER device, the 7133SA45J uses these signals to stall the contending port until arbitration completes. External pull-up resistors are mandatory for proper logic-level operation. This hardware arbitration eliminates software-based locking mechanisms and ensures deterministic timing in dual-CPU systems.

Can the 7133SA45J operate with a 3.3V supply?

No, the 7133SA45J is specified exclusively for 5.0 V ±10% operation (4.5 V to 5.5 V). Its input thresholds (VIH = 2.2 V min, VIL = 0.8 V max) and output drive characteristics are TTL-compatible and not guaranteed at 3.3 V. Attempting 3.3 V operation risks undefined logic states, increased leakage, and potential data corruption. For 3.3 V systems, consider modern QDR or DDR SRAM alternatives - but note they lack native BUSY arbitration.

How does the 7133SA45J differ from the 7143SA45J?

The 7133SA45J is the MASTER device with on-chip arbitration logic and open-drain BUSY outputs; the 7143SA45J is the SLAVE device with BUSY inputs only and no arbitration circuitry. They share identical pinouts and timing, but only the 7133SA45J can resolve contention autonomously. In width-expanded systems, one 7133SA45J coordinates multiple 7143SA45Js - the latter cannot function stand-alone as an arbitrator.

Is the 7133SA45J suitable for battery-backed applications?

Yes - the 7133SA45J supports data retention down to VCC = 2.0 V, enabling operation from a backup battery during main power loss. In retention mode, ICCDR is typically 100 µA (max 1500 µA commercial grade), allowing multi-day holdover with small coin cells. The SA variant's 5 mW standby power (typ.) further extends battery life compared to higher-power alternatives.

What package options are available for the 7133SA45J?

The 7133SA45J is available in 68-pin PLCC (PLG68), 68-pin ceramic PGA (GU68), 68-pin flatpack (FP68), and 100-pin TQFP (PNG100). The PLCC variant is the most widely used for industrial PCB assembly due to its robustness, reworkability, and JEDEC-standard footprint. All packages support the full industrial temperature range (–40°C to +85°C) and share identical electrical specifications.