Renesas 7133LA45J

Overview

7133LA45J 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, 45ns maximum read cycle time, 1050mW typical active power, and 1µA typical full-standby current. It enables simultaneous asynchronous access from two independent ports in real-time systems such as military radar processors and industrial motion controllers.

For engineers reviewing the 7133LA45J datasheet, 7133LA45J pinout, 7133LA45J application, or 7133LA45J equivalent, this page delivers verified timing parameters, byte-selectable write control per port, BUSY arbitration behavior, battery backup data retention at 2V, and precise 68-pin PLCC package mapping - all critical for deterministic dual-processor memory coherency design.

Technical Context

The 7133LA45J implements fully asynchronous dual-port operation 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 outputs to stall the losing port.

As a MASTER device, it supports width expansion with SLAVE IDT7143LA parts via BUSY output-to-input cascading. Each port features independent upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), enabling partial writes without read-modify-write cycles.

Key Specifications

Pinout & Package

7133LA45J is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), with dual VCC and GND pins requiring connection for reliable operation. Pin 1 is marked by a corner notch; body dimensions are approximately 0.95 in × 0.95 in × 0.17 in.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7143LA45J and CY7C1371DV33-166AXC, the 7133LA45J uniquely provides integrated arbitration, 5V TTL compatibility, and battery-retained operation - making it irreplaceable in safety-critical, low-voltage-fallback, and deterministic dual-processor systems.

Availability

7133LA45J is available at Aetrix Electronics and suitable for radar signal processing, industrial motion control, and avionics flight management units requiring stable component supply across extended product lifecycles.

Supply support for 7133LA45J 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 timing, memory, and interface solutions, now part of Renesas Electronics.

The IDT7133/7143 family was designed specifically for deterministic dual-processor systems requiring hardware-arbitrated shared memory - targeting military, industrial, and aerospace applications demanding reliability under temperature stress and power interruption.

FAQ

What is the function of the BUSY pins on the 7133LA45J?

The BUSYL and BUSYR pins on the 7133LA45J are open-drain outputs that signal port contention when both ports attempt simultaneous access to the same memory location. As a MASTER device, the 7133LA45J asserts these signals to stall the losing port's access - preventing data corruption. External pull-up resistors are required, and the signals can be cascaded to SLAVE IDT7143LA devices in width-expanded configurations. This behavior is intrinsic to the 7133LA45J architecture and cannot be disabled.

Does the 7133LA45J support battery backup operation, and what voltage is required?

Yes, the 7133LA45J supports battery backup data retention at VCC = 2.0V minimum, with typical data retention current of 100µA (commercial) or 100–4000µA (industrial/military). This capability is specific to the LA (low-power) variant and enables the 7133LA45J to retain memory contents during main power failure - a key requirement in avionics and industrial control systems. The 7133LA45J does not require external circuitry beyond a 2V backup source connected to VCC.

Can the 7133LA45J operate as a standalone dual-port RAM without a SLAVE device?

Yes, the 7133LA45J functions fully as a standalone 2K × 16 dual-port SRAM with complete arbitration logic, BUSY signaling, and independent port control. Its MASTER designation indicates capability to coordinate with SLAVE IDT7143LA devices for width expansion - not dependency. In standalone mode, the 7133LA45J manages all contention resolution internally, and BUSY outputs directly control local processor stalls. No SLAVE device is needed unless expanding beyond 16-bit data width.

What is the significance of separate upper and lower byte write enables on the 7133LA45J?

The 7133LA45J provides R/WLUB/R/WLLB (left port) and R/WRUB/R/WRLB (right port) to enable independent 8-bit write operations per port. This eliminates read-modify-write sequences when updating individual bytes, reducing bus traffic and improving real-time determinism. For example, a motion controller can update a status byte (upper) while leaving command data (lower) intact - a feature confirmed in the functional description and pin table of the 7133LA45J datasheet.

Which package type is used by the 7133LA45J, and are there pin-compatible alternatives?

The 7133LA45J uses a 68-pin Plastic Leaded Chip Carrier (PLCC) package, as confirmed by the "PLG68" designation in the pin configuration diagrams and ordering information. While IDT also offered the same speed grade in 68-pin PGA, flatpack, and 100-pin TQFP variants, those are not pin-compatible with the PLCC version. Substitution requires PCB layout change; no drop-in replacement exists across packages. The 7133LA45J PLCC footprint is unique to this variant and must be matched exactly in design.