Renesas 7133SA70J8

Overview

7133SA70J8 from IDT is a high-speed 2K × 16 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 70 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 7133SA70J8 datasheet, 7133SA70J8 pinout, 7133SA70J8 application, or 7133SA70J8 equivalent, this page delivers verified timing parameters (tRC = 70 ns), byte-select write control (R/WLUB/R/WLLB), dual-port arbitration behavior, battery backup capability (2V data retention), and exact 68-pin PLCC package mapping - all critical for deterministic multi-CPU memory coherency design.

Technical Context

The 7133SA70J8 implements fully asynchronous dual-port access with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port contention via BUSY flag assertion, where tBDD (BUSY disable to valid data) is 40 ns max at 70 ns speed grade, and tAPS (arbitration priority setup) is 5 ns minimum.

As a MASTER device, it drives BUSYL/BUSYR as open-drain outputs (requiring pull-up resistors), while SLAVE IDT7143 devices accept BUSY as inputs. The device supports separate upper/lower byte write enables per port and operates across industrial temperature range (–40°C to +85°C) with 5V ±10% supply.

Key Specifications

Pinout & Package

7133SA70J8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), with dual-row 0.05-inch pitch, 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 CY7C1362BV33 and IDT7143SA70J8, the 7133SA70J8 uniquely integrates arbitration logic and open-drain BUSY output, enabling drop-in deterministic dual-CPU memory sharing without external components or voltage translation - critical for legacy 5V industrial and avionics designs.

Availability

7133SA70J8 is available at Aetrix Electronics and suitable for real-time motion control, dual-CPU industrial PLCs, and avionics data acquisition requiring stable component supply, long-term lifecycle assurance, and MIL-qualified reliability.

Supply support for 7133SA70J8 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 sensor solutions, now part of Renesas Electronics.

The IDT7133/7143 family was engineered for deterministic, contention-free memory sharing between independent processors in mission-critical embedded systems - emphasizing hardware arbitration, low-latency access, and robust industrial/military qualification.

FAQ

What is the function of the BUSY pin on the 7133SA70J8?

The BUSY pin on the 7133SA70J8 is an open-drain output that signals port contention when both left and right ports attempt simultaneous access to the same memory address. It must be externally pulled up to VCC and is used to stall the contending port's write operation - ensuring data integrity without software intervention. This behavior is intrinsic to its MASTER role and differs from the SLAVE IDT7143, where BUSY is an input.

Can the 7133SA70J8 operate with a 3.3V supply?

No, the 7133SA70J8 is specified exclusively for 5.0 V ±10% (4.5 V to 5.5 V) operation and is TTL-compatible. Its DC and AC electrical characteristics - including VIH = 2.2 V min, VOL = 0.4 V max, and tRC = 70 ns - are guaranteed only within this 5V range. Using 3.3V violates absolute maximum ratings and will result in undefined functionality or device damage.

How does the 7133SA70J8 support memory width expansion to 32 bits or more?

The 7133SA70J8 supports width expansion as the MASTER device in a MASTER/SLAVE configuration with IDT7143 SLAVE parts. The 7133SA70J8 generates BUSY signals to coordinate arbitration across multiple chips, while IDT7143 devices accept those BUSY inputs to inhibit writes. This eliminates "busy lock-out" and enables synchronized 32-bit+ word access without external logic or timing glue.

What is the data retention capability of the 7133SA70J8?

The 7133SA70J8 supports data retention at VCC = 2.0 V minimum, drawing ≤ 4000 µA (military grade) or ≤ 1500 µA (commercial grade) in retention mode. This allows continued data hold during brown-out, battery backup, or controlled power-down sequences - verified per IDT specification table 08 and applicable to both SA and LA variants.

Is the 7133SA70J8 pin-compatible with the IDT7143SA70J8?

Yes, the 7133SA70J8 and IDT7143SA70J8 share identical pinouts and package dimensions (68-pin PLCC), but their BUSY pin functionality differs fundamentally: 7133SA70J8 drives BUSY as an open-drain output, while IDT7143SA70J8 receives BUSY as an input. They are not functionally interchangeable - the 7133SA70J8 is required for MASTER arbitration; IDT7143SA70J8 serves only as SLAVE in expanded systems.