Renesas 7133LA25JI8

Overview

7133LA25JI8 from IDT (Integrated Device Technology) is a high-speed 2K × 16 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 25 ns maximum access time, industrial temperature range (–40°C to +85°C), and low-power LA variant consuming 1050 mW active / 1 mW standby power. It enables error-free 32-bit-or-wider memory expansion in real-time embedded systems requiring concurrent CPU/DSP access.

For engineers reviewing the 7133LA25JI8 datasheet, 7133LA25JI8 pinout, 7133LA25JI8 application, or 7133LA25JI8 equivalent, key selection criteria include BUSY arbitration capability, byte-selectable write control per port, battery backup data retention at 2 V, TTL-compatible 5 V ±10% operation, and 68-pin PLCC package compatibility with industrial-grade reliability.

Technical Context

The 7133LA25JI8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses - enabling simultaneous read/write operations without internal synchronization. Its on-chip arbitration logic resolves port contention via open-drain BUSYL/BUSYR outputs requiring external pull-up resistors, and supports MASTER/SLAVE cascading for 32-bit+ bus width expansion.

It features separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), output enable per port (OEL/OER), and automatic power-down controlled by chip enable (CEL/CER). The LA variant guarantees 2 V data retention with typical 200 µW per port standby current during battery backup mode.

Key Specifications

Pinout & Package

7133LA25JI8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC, code PLG68) with 0.95″ × 0.95″ footprint and gull-wing leads. Pin 1 identifier is marked with a notch or dot; both VCC and GND pins must be connected for reliable operation per datasheet Note 1–2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-25JC, 7133LA25JI8 delivers integrated arbitration and MASTER/SLAVE scalability; compared with IDT7143LA25JI8, it provides autonomous contention resolution and standalone operation - making it the only choice for systems requiring self-contained dual-port concurrency control.

Availability

7133LA25JI8 is available at Aetrix Electronics and suitable for real-time digital signal processing, industrial motion control, avionics data acquisition, and telecom line card buffering requiring stable component supply across extended product lifecycles.

Supply support for 7133LA25JI8 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, low-latency dual-processor and DSP/microcontroller co-processing architectures demanding hardware-enforced memory coherency without software overhead.

FAQ

What is the function of the BUSY pins on the 7133LA25JI8?

The BUSYL and BUSYR pins on the 7133LA25JI8 are open-drain outputs that signal port contention when both ports attempt simultaneous access to the same memory location. They require external pull-up resistors and are used to stall the contending port's access until the winning port completes its operation. This hardware arbitration eliminates race conditions and ensures deterministic behavior in multi-CPU systems - a core capability distinguishing the 7133LA25JI8 from SLAVE-only variants like IDT7143LA25JI8.

Can the 7133LA25JI8 operate with a 2 V backup supply?

Yes, the 7133LA25JI8 supports data retention at VCC = 2 V, drawing only 100–4000 µA depending on temperature grade. This feature allows continuous memory preservation during main power failure in industrial and avionics applications. The LA variant's ultra-low standby current (1 mW typ.) makes it ideal for battery-backed systems where runtime and reliability are critical - confirmed in datasheet Table 8 and Figure 5.

How does the 7133LA25JI8 differ from the IDT7143LA25JI8?

The 7133LA25JI8 is the MASTER device with on-chip arbitration logic and BUSY outputs, while the IDT7143LA25JI8 is the SLAVE device with BUSY inputs only and no arbitration circuitry. Both share identical pinouts and timing, but only the 7133LA25JI8 can resolve contention autonomously and operate standalone. The 7143LA25JI8 is intended solely for width expansion alongside a 7133LA25JI8 - it cannot replace the 7133LA25JI8 in MASTER roles.

What package type is used for the 7133LA25JI8?

The 7133LA25JI8 uses a 68-pin Plastic Leaded Chip Carrier (PLCC) package, designated PLG68 in IDT documentation. Its dimensions are approximately 0.95 in × 0.95 in × 0.17 in, with gull-wing leads compatible with standard surface-mount assembly processes. Both VCC and GND pins must be connected per datasheet Notes 1–2 to ensure reliable operation - a requirement verified in Drawing 02c and Table 1.

Does the 7133LA25JI8 support byte-selectable writes?

Yes, the 7133LA25JI8 provides separate upper and lower byte write enables for each port: R/WLUB and R/WLLB for the left port, R/WRUB and R/WRLB for the right port. This allows independent 8-bit writes to I/O0–I/O7 or I/O8–I/O15 without affecting the complementary byte - essential for efficient register-mapped I/O, partial-word updates in protocol stacks, and minimizing bus turnaround overhead in real-time systems.