Renesas 7133SA55J8

Overview

7133SA55J8 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 systems such as digital signal processors and network packet buffers.

For engineers reviewing the 7133SA55J8 datasheet, 7133SA55J8 pinout, 7133SA55J8 application, or 7133SA55J8 equivalent, key selection factors include BUSY arbitration capability, byte-selectable write control per port, 2V data retention in LA variants, 68-pin PLCC package compatibility, and verified timing for 32-bit bus expansion with IDT7143 slaves.

Technical Context

The 7133SA55J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses for left and right ports. Its on-chip arbitration logic resolves contention when both ports access the same memory location, asserting open-drain BUSYL/BUSYR flags requiring external pull-up resistors.

It supports independent byte-write enable (R/WLUB/R/WLLB and R/WRUB/R/WRLB) and output enable (OEL/OER) per port, enabling precise 8-bit sub-word writes without read-modify-write cycles. The device enters low-power standby (<5 mW typ.) when chip enable (CEL/CER) is deasserted.

Key Specifications

Pinout & Package

7133SA55J8 is supplied in a 68-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050" lead pitch and JEDEC MO-047A outline. Pin 1 is marked by a corner notch; body dimensions are approximately 0.95" × 0.95" × 0.17". Both VCC and GND pins must be connected to ensure reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-55JC, 7133SA55J8 reduces BOM count and PCB area by integrating arbitration, while versus IDT7143SA55J8 it provides autonomous master functionality essential for standalone dual-port operation.

Availability

7133SA55J8 is available at Aetrix Electronics and suitable for industrial motion control, avionics data concentration, and telecom packet buffering requiring stable component supply across extended product lifecycles.

Supply support for 7133SA55J8 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 family was engineered specifically for deterministic dual-ported memory access in real-time embedded systems requiring hardware arbitration and seamless bus expansion.

FAQ

What is the function of the BUSY pins on the 7133SA55J8?

The BUSYL and BUSYR pins on the 7133SA55J8 are open-drain outputs that signal port-to-port address contention. When both ports attempt to access the same memory location simultaneously, the on-chip arbitration logic asserts the corresponding BUSY pin to stall the lower-priority access. Because they are open-drain, external pull-up resistors (typically 4.7 kΩ to VCC) are required for proper logic-level definition. This hardware arbitration eliminates the need for software polling or external logic in real-time systems.

Can the 7133SA55J8 operate with a 3.3V supply?

No, the 7133SA55J8 is specified only 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), output drive strength, and internal timing are characterized exclusively for 5V TTL-compatible signaling. Applying 3.3V violates the Absolute Maximum Ratings and will result in undefined behavior, including failure to meet the 55 ns access time specification and potential data corruption. For 3.3V systems, consider IDT's later-generation low-voltage dual-port RAMs.

How does the 7133SA55J8 differ from the IDT7143SA55J8?

The 7133SA55J8 is the MASTER device with integrated arbitration logic and open-drain BUSY outputs, while the IDT7143SA55J8 is the SLAVE device with BUSY inputs only and no arbitration circuitry. They share identical pinouts and timing, but the 7133SA55J8 can operate stand-alone as a dual-port RAM, whereas the IDT7143SA55J8 is designed solely for width expansion-paired with a 7133SA55J8 to build 32-bit or wider memory systems without external arbitration logic.

What package type is used for the 7133SA55J8?

7133SA55J8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC) with JEDEC MO-047A outline. The package features a square body measuring approximately 0.95 inches × 0.95 inches × 0.17 inches, gull-wing leads on all four sides, and a corner notch marking pin 1. This surface-mount package supports standard reflow soldering and is compatible with automated assembly processes used in industrial and aerospace manufacturing.

Does the 7133SA55J8 support battery backup operation?

The 7133SA55J8 (SA suffix) does not support battery backup data retention; only the LA-suffix variants (e.g., 7133LA55J8) guarantee 2V data retention with typical current draw of 100 µA. The SA version is optimized for higher-speed commercial/industrial operation and lacks the low-leakage design features required for reliable retention below 4.5V. If battery backup is required, the LA variant must be selected and the VCC supply must be maintained at ≥2.0V during backup mode.