Renesas 7133SA55PF8

Overview

7133SA55PF8 from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 55 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables simultaneous independent access from two asynchronous ports in real-time embedded systems requiring deterministic memory contention resolution.

For engineers reviewing the 7133SA55PF8 datasheet, 7133SA55PF8 pinout, 7133SA55PF8 application, or 7133SA55PF8 equivalent, this page delivers verified timing parameters, BUSY arbitration behavior, byte-select write control, power-down modes, and master/slave expansion capability for 32-bit+ memory systems.

Technical Context

The 7133SA55PF8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves port-to-port contention via open-drain BUSY output (left/right), enabling deterministic priority-based access without external logic.

It supports independent lower/upper byte write enable (R/WLLB/R/WLUB and R/WRLB/R/WRUB), TTL-level signaling, and battery backup data retention at 2V (LA variant only). The 7133SA55PF8 is specifically designated as MASTER in IDT's MASTER/SLAVE width-expansion scheme with IDT7143.

Key Specifications

Pinout & Package

7133SA55PF8 is packaged in a 68-pin PLCC (PLG68), with 2×34-pin staggered layout, body size ≈ 0.95 in × 0.95 in × 0.17 in. Both VCC and GND pins are duplicated for noise immunity and current distribution.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7143SA55PF8 and CY7C136-55JC, the 7133SA55PF8 uniquely integrates master arbitration logic and open-drain BUSY outputs-enabling drop-in deterministic contention management in industrial and avionics systems without external components.

Availability

7133SA55PF8 is available at Aetrix Electronics and suitable for real-time DSP systems, industrial PLC memory buffers, avionics data acquisition, and test equipment pattern memory requiring stable component supply and long-term industrial-grade availability.

Supply support for 7133SA55PF8 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 for communications, computing, and industrial markets.

The IDT7133/7143 family was designed specifically for deterministic dual-processor and real-time embedded applications requiring hardware-arbitrated shared memory with minimal latency and zero software overhead.

FAQ

What is the function of the BUSY pins on the 7133SA55PF8?

The BUSYL and BUSYR pins on the 7133SA55PF8 are open-drain outputs that assert during port-to-port address contention. When both ports attempt access to the same memory location simultaneously, the on-chip arbitration logic drives BUSY low to stall the lower-priority port. These signals require external pull-up resistors and serve as hardware handshake flags-enabling deterministic resolution without software intervention. This behavior is intrinsic to the 7133SA55PF8 as the MASTER device.

Can the 7133SA55PF8 operate as a stand-alone 16-bit dual-port RAM?

Yes, the 7133SA55PF8 can operate as a stand-alone 16-bit dual-port RAM without requiring companion devices. Its full feature set-including independent left/right port control, byte-select write enables, and on-chip arbitration-is functional in isolation. The MASTER/SLAVE expansion capability is optional and only engaged when interfacing with IDT7143 devices for wider data paths. Stand-alone use maintains all 55 ns timing guarantees across the industrial temperature range.

How does the 7133SA55PF8 handle power-down modes?

The 7133SA55PF8 enters low-power standby when CEL or CER is driven HIGH, disabling the respective port's internal circuitry. With both CE pins high, typical standby current is 25 mA (TTL-level inputs) or as low as 1.0 mA (CMOS-level inputs). Full power-down occurs when both ports are deselected and all inputs held at valid logic levels. The device remains capable of retaining data during standby but does not support true battery backup-unlike the LA variant, the SA suffix indicates standard power consumption without 2V retention capability.

What package type is used for the 7133SA55PF8?

7133SA55PF8 uses a 68-pin plastic leaded chip carrier (PLCC), designated PLG68. Its footprint measures approximately 0.95 inches square with 0.17-inch height. The package features dual VCC and dual GND pins for improved power integrity and noise rejection. Pin 1 is marked by a corner notch, and the top-view pinout matches IDT's standardized 68-pin dual-port RAM layout-ensuring mechanical and electrical compatibility with existing IDT7133/7143 PCB footprints.

Is the 7133SA55PF8 pin-compatible with other speed grades in the same family?

Yes, the 7133SA55PF8 is fully pin-compatible with all other IDT7133SA variants (e.g., 7133SA20, 7133SA25, 7133SA35, etc.) and with IDT7143SA devices. All share identical 68-pin PLCC pinout, signal naming, and DC/AC electrical interface characteristics. Speed grade differences affect only timing parameters (e.g., tRC, tAA); no layout changes are needed when upgrading or downgrading within the SA series. This simplifies design reuse and inventory rationalization across performance tiers.