Renesas 7133SA90JI8

Overview

7133SA90JI8 from IDT (Integrated Device Technology) is a high-speed 2K × 16-bit dual-port static RAM configured as a MASTER device with on-chip port arbitration logic, BUSY output flag, and separate upper/lower byte write controls per port. It operates at 90 ns max access time across industrial temperature range (–40°C to +85°C), supports TTL-compatible 5V ±10% supply, and enables 32-bit+ bus width expansion when paired with IDT7143 SLAVE devices in real-time embedded systems requiring concurrent CPU/DSP memory access.

For engineers reviewing the 7133SA90JI8 datasheet, 7133SA90JI8 pinout, 7133SA90JI8 application, or 7133SA90JI8 equivalent, key selection criteria include its 90 ns read cycle time, open-drain BUSY output requiring pull-up, dual independent asynchronous ports, battery backup data retention at 2V, and compatibility with 68-pin PLCC packaging for legacy military/industrial control designs.

Technical Context

The 7133SA90JI8 implements fully asynchronous dual-port architecture with independent address, control, and I/O buses for left and right ports-enabling simultaneous read/write operations without internal synchronization overhead. Its on-chip arbitration logic resolves contention by asserting BUSYL/BUSYR flags when both ports access the same memory location, with priority determined by tAPS (5 ns setup time).

As a MASTER device, it features open-drain BUSY outputs (requiring external pull-up resistors) and supports width expansion via SLAVE IDT7143 devices where BUSY becomes an input. The device uses CMOS high-performance fabrication, delivers 1150 mW typical active power, and enters low-power standby (5 mW typ.) when chip enable is deasserted.

Key Specifications

Pinout & Package

7133SA90JI8 is packaged in a 68-pin PLCC (Plastic Leaded Chip Carrier) with 0.05-inch lead pitch, body size ≈ 0.95 in × 0.95 in × 0.17 in. 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 SRAM applications.

Compared with CY7C133-90JC, the 7133SA90JI8 eliminates external arbitration components and enables deterministic contention handling; compared with IDT7143SA90JI8, it provides autonomous arbitration and BUSY output capability essential for standalone dual-CPU designs.

Availability

7133SA90JI8 is available at Aetrix Electronics and suitable for industrial motion control, avionics data logging, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7133SA90JI8 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) was a fabless semiconductor company specializing in timing, memory interface, and RF solutions before its acquisition by Renesas Electronics in 2019. It delivered high-reliability components for aerospace, defense, and industrial markets.

The IDT7133 family was designed specifically for real-time embedded systems requiring deterministic, contention-free dual-processor memory sharing - targeting applications where software arbitration introduces unacceptable latency or complexity.

FAQ

What is the operating temperature range certified for the 7133SA90JI8?

The 7133SA90JI8 is rated for industrial temperature operation from –40°C to +85°C, with all electrical specifications guaranteed across this range. This qualification makes it suitable for deployment in harsh environments such as factory automation controllers, outdoor telecom equipment, and vehicle-mounted computing systems where ambient thermal extremes are expected.

Does the 7133SA90JI8 require external pull-up resistors on its BUSY pins?

Yes, the 7133SA90JI8 features open-drain BUSYL and BUSYR outputs that require external pull-up resistors to VCC. This design allows wired-OR configuration when multiple 7133 devices share a common BUSY interrupt line. Typical pull-up values range from 4.7 kΩ to 10 kΩ depending on bus capacitance and rise-time requirements.

Can the 7133SA90JI8 operate with a 3.3V supply?

No, the 7133SA90JI8 is specified exclusively for 5.0 V ±10% (4.5–5.5 V) operation. Its input thresholds, output drive strength, and internal logic levels are designed for TTL compatibility. Using 3.3 V violates absolute maximum ratings and will result in undefined behavior, including failure to recognize logic highs and degraded noise margins.

How does the 7133SA90JI8 handle simultaneous access to the same memory address from both ports?

When both ports attempt to access the same address concurrently, the 7133SA90JI8's on-chip arbitration logic asserts the BUSY flag on the losing port after a fixed tAPS (5 ns) setup time. The winning port proceeds with its operation; the losing port's write is internally gated, and its read returns high-impedance or invalid data until BUSY deasserts - ensuring deterministic resolution without external logic.

Is the 7133SA90JI8 pin-compatible with the IDT7143SA90JI8?

Yes, the 7133SA90JI8 and IDT7143SA90JI8 share identical 68-pin PLCC pinouts and DC/AC timing specifications. However, functional differences exist: 7133SA90JI8 has BUSY outputs and arbitration logic, while 7143SA90JI8 has BUSY inputs and no arbitration - making them complementary in MASTER/SLAVE topologies rather than drop-in replacements.