Renesas 7133LA25J

Overview

7133LA25J from Integrated Device Technology (IDT) 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-series operation (1050 mW active, 1 µA standby). It enables error-free 32-bit-or-wider memory expansion when paired with IDT7143 SLAVE devices in real-time embedded control systems.

For engineers reviewing the 7133LA25J datasheet, 7133LA25J pinout, 7133LA25J application, or 7133LA25J equivalent, this page delivers verified timing parameters, byte-selectable write control per port, BUSY arbitration behavior, battery backup data retention at 2 V, and package-specific layout guidance for 68-pin PLCC implementation.

Technical Context

The 7133LA25J implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses - permitting concurrent read/write access to any memory location without internal synchronization overhead. Its on-chip arbitration logic resolves port-to-port contention via open-drain BUSYL/BUSYR outputs requiring external pull-up resistors.

As a MASTER device, it generates BUSY flags during address-matching contention and supports width expansion by driving BUSY inputs of IDT7143 SLAVE devices. The LA variant uses CMOS process optimization to achieve 1 µA full-standby current and 2 V data retention, enabling battery-backed operation in power-critical systems.

Key Specifications

Pinout & Package

7133LA25J is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC, code PLG68), measuring approximately 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 IDT7143LA25J and CY7C1362V25, the 7133LA25J uniquely integrates arbitration logic and open-drain BUSY outputs - delivering deterministic, lock-free dual-processor memory sharing without external components or firmware overhead.

Availability

7133LA25J is available at Aetrix Electronics and suitable for real-time motion control, redundant communication buffers, avionics display memory, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for 7133LA25J 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions for communications, computing, and industrial markets.

The IDT7133/7143 family was designed specifically for deterministic dual-processor memory sharing in real-time embedded systems - prioritizing hardware arbitration, low-latency access, and robust industrial operation.

FAQ

What is the function of the BUSY pins on the 7133LA25J?

The BUSYL and BUSYR pins on the 7133LA25J are open-drain outputs that assert during port-to-port address contention - signaling that a simultaneous access to the same memory location has occurred. As a MASTER device, the 7133LA25J uses these signals to stall the contending port's write operation until resolution. External pull-up resistors are required for proper logic-level operation, and the BUSY outputs directly drive IDT7143 SLAVE devices in width-expanded configurations.

Does the 7133LA25J support battery backup operation, and what voltage is required?

Yes, the 7133LA25J supports battery backup data retention at VCC = 2.0 V minimum, maintaining stored data indefinitely while main power is absent. This capability is intrinsic to the LA-series low-power design and is validated across the industrial temperature range (–40°C to +85°C). The device draws only 100 µA typical in data retention mode, enabling multi-year operation from small lithium coin cells.

Can the 7133LA25J operate as a stand-alone dual-port RAM without a SLAVE device?

Yes, the 7133LA25J functions fully as a stand-alone 2K × 16 dual-port SRAM with complete arbitration logic, BUSY signaling, and independent left/right control. It does not require an IDT7143 SLAVE unless expanding data bus width beyond 16 bits. In stand-alone mode, both BUSYL and BUSYR remain active for local contention detection, and all timing specifications - including 25 ns access - apply without dependency on external devices.

What is the difference between the SA and LA versions of the 7133 series?

The SA (Standard Active) version of the 7133 consumes 1150 mW typical active power and 5 mW standby, while the LA (Low Active) version - including the 7133LA25J - reduces active power to 1050 mW typical and standby to just 1 mW. More critically, only the LA variant guarantees 2 V data retention and achieves 100 µA retention current, making it suitable for battery-backed applications where the SA version would lose data below ~3 V.

Which packages are available for the 7133LA25J, and is the PLCC pinout compatible with other variants?

The 7133LA25J is available in 68-pin PLCC (PLG68), 68-pin ceramic PGA, 68-pin flatpack, and 100-pin TQFP. All IDT7133/7143 variants - regardless of speed grade (20/25/35 ns) or power type (SA/LA) - share identical pinouts across these packages. This allows direct PCB footprint reuse when migrating between speed grades or power variants, provided mechanical and thermal constraints of the chosen package are met.