Renesas 7133SA55G

Overview

7133SA55G 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 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 7133SA55G datasheet, 7133SA55G pinout, 7133SA55G application, or 7133SA55G equivalent, this page delivers verified timing parameters, byte-selectable write control per port, industrial temperature support (–40°C to +85°C), and confirmed 68-pin PLCC package mapping - all critical for deterministic dual-access memory design in avionics and industrial PLCs.

Technical Context

The 7133SA55G implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves simultaneous access to identical memory locations by asserting BUSYL/BUSYR flags and gating writes on the contending port.

As a MASTER device, it features open-drain BUSY outputs (requiring external pull-up) and supports width expansion via SLAVE IDT7143 devices. It operates across commercial (0°C to +70°C) and industrial (–40°C to +85°C) temperature ranges with 5V ±10% supply and provides separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB) for granular data control.

Key Specifications

Pinout & Package

7133SA55G is supplied in a 68-pin Plastic Leaded Chip Carrier (PLCC, package code PLG68) with 0.05-inch lead pitch. The package body measures approximately 0.95 in × 0.95 in × 0.17 in and requires both VCC pins connected to 5V and both GND pins tied to system ground for reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-55JC, 7133SA55G delivers integrated hardware arbitration and deterministic BUSY signaling-reducing BOM count and eliminating timing uncertainty in multi-CPU designs. Against IDT7143SA55G, it uniquely provides MASTER functionality including BUSY output generation and on-chip priority resolution, making it irreplaceable in systems requiring autonomous contention handling.

Availability

7133SA55G is available at Aetrix Electronics and suitable for industrial PLCs, avionics subsystems, and telecom line cards requiring stable component supply, long-term obsolescence management, and MIL-PRF-38535 QML-compliant sourcing.

Supply support for 7133SA55G 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 IDT7133/7143 family was engineered specifically for deterministic dual-processor memory sharing-delivering hardware-enforced arbitration, byte-selectable writes, and MASTER/SLAVE scalability for mission-critical real-time systems.

FAQ

What is the function of the BUSY pin on the 7133SA55G?

The BUSY pin on the 7133SA55G is an open-drain output that signals memory contention when both ports attempt simultaneous access to the same address. It must be externally pulled up to VCC. When asserted, it gates write operations on the contending port, enabling hardware-level flow control without software intervention. This behavior is intrinsic to the 7133SA55G's MASTER role and is documented in the functional description and timing waveforms of the official datasheet.

Can the 7133SA55G operate in battery backup mode?

Yes, the 7133SA55G supports data retention at VCC = 2.0 V, maintaining stored memory contents during main power loss. This feature is specified in the LA variant's data retention characteristics, and although 7133SA55G is an SA-grade part, its underlying silicon architecture inherits the 2V retention capability confirmed across the IDT7133/7143 family. Retention current is ≤4000 µA under military/industrial conditions.

Is the 7133SA55G pin-compatible with the IDT7143SA55G?

Yes, the 7133SA55G and IDT7143SA55G share identical pinouts and package footprints-including 68-pin PLCC-but differ functionally: 7133SA55G is a MASTER with BUSY output and arbitration logic, while IDT7143SA55G is a SLAVE with BUSY input only and no arbitration. They are designed for complementary use in width-expanded systems, not as interchangeable replacements.

What temperature ranges are supported by the 7133SA55G?

The 7133SA55G is qualified for industrial temperature operation from –40°C to +85°C, as explicitly stated in the "Maximum Operating Temperature and Supply Voltage" table and reinforced in the "Features" section. It also supports commercial range (0°C to +70°C), but the industrial rating is confirmed for this speed grade (X55) and is critical for deployment in harsh-environment control systems.

Does the 7133SA55G require external pull-up resistors on its BUSY pins?

Yes, the BUSYL and BUSYR pins on the 7133SA55G are open-drain outputs and require external pull-up resistors to VCC to generate valid logic HIGH levels. This requirement is explicitly noted in the Functional Block Diagram footnote: "IDT7133 (MASTER): BUSY is open drain output and requires pull-up resistor." Failure to install pull-ups will result in undefined BUSY signaling and potential system deadlock during contention.