Renesas 7133LA25PFI8

Overview

7133LA25PFI8 from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 25 ns max 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 simultaneous asynchronous read/write access from two independent ports in real-time embedded systems requiring deterministic memory contention resolution.

For engineers reviewing the 7133LA25PFI8 datasheet, 7133LA25PFI8 pinout, 7133LA25PFI8 application, or 7133LA25PFI8 equivalent, key selection criteria include BUSY arbitration timing (tBAA ≤ 25 ns), byte-selectable write control per port, 2V data retention capability, and compatibility with 68-pin PLCC packaging for legacy industrial controller upgrades.

Technical Context

The 7133LA25PFI8 implements on-chip port arbitration logic exclusively in MASTER configuration, generating open-drain BUSY output signals (BUSYL/BUSYR) that require external pull-up resistors. Its dual independent ports support fully asynchronous operation with separate address, control, and I/O buses - enabling concurrent CPU and DMA access without software coordination.

It supports battery backup operation at VCC = 2V with typical data retention current of 100 µA, and features TTL-compatible inputs/outputs with single 5V ±10% supply. The LA variant reduces active power by ~9% versus SA versions while maintaining identical timing and pinout across the 7133/7143 family.

Key Specifications

Pinout & Package

7133LA25PFI8 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, and surface-mount compatibility for reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-25JC and IDT7143LA25PFI8, the 7133LA25PFI8 uniquely delivers self-contained hardware arbitration - reducing BOM count, PCB area, and firmware complexity in dual-CPU architectures where deterministic memory access is mandatory.

Availability

7133LA25PFI8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics subsystems, medical imaging buffers, and automated test equipment requiring stable component supply and long-term obsolescence management.

Supply support for 7133LA25PFI8 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 industrial, communications, and computing markets.

The 7133/7143 family was designed specifically for real-time embedded systems requiring deterministic dual-processor memory coherency without software intervention - targeting industrial automation, aerospace, and medical instrumentation.

FAQ

What is the function of the BUSY pins on the 7133LA25PFI8?

The BUSYL and BUSYR pins on the 7133LA25PFI8 are open-drain outputs indicating port contention when both ports access the same memory location simultaneously. They require external pull-up resistors and are used to stall the contending port's access until arbitration completes. This hardware mechanism replaces software semaphore overhead in dual-CPU systems and is exclusive to the MASTER 7133 variant - not present in SLAVE 7143 devices.

Does the 7133LA25PFI8 support battery backup operation?

Yes, the 7133LA25PFI8 supports battery backup operation down to VCC = 2.0V with typical data retention current of 100 µA. This allows it to maintain memory contents during main power loss without external circuitry - a key feature for industrial controllers and avionics systems requiring state persistence through brown-outs. The LA variant's 1 mW standby power further extends battery life compared to SA versions.

Can the 7133LA25PFI8 be used as a standalone dual-port RAM without arbitration?

Yes, the 7133LA25PFI8 functions as a fully asynchronous dual-port RAM even when BUSY arbitration is disabled. In non-contention scenarios - such as dedicated CPU/DMA partitioning or sequential access patterns - the on-chip arbitration logic remains inactive and does not affect timing. The device retains all core functionality including independent port control, byte-selectable writes, and 25 ns access, making it suitable for simpler dual-access applications without hardware conflict resolution.

What is the significance of the 'LA' suffix in 7133LA25PFI8?

The 'LA' suffix in 7133LA25PFI8 denotes the Low-Power Advanced version, distinguishing it from the standard 'SA' variant. It delivers identical 25 ns timing and pinout but reduces active power consumption to 1050 mW (typ.) and standby power to 1 mW (typ.) - a ~9% reduction in active power and >80% reduction in standby versus SA. This enables longer battery life in portable or energy-constrained applications while maintaining full functional compatibility.

Which packages are available for the 7133LA25PFI8?

Per official IDT documentation, the 7133LA25PFI8 is available in the 68-pin PLCC (Plastic Leaded Chip Carrier) package, identified by the 'PFI8' suffix. While the broader 7133/7143 family also offers 68-pin ceramic PGA, flatpack, and 100-pin TQFP variants, the PFI8 ordering code specifically maps to the PLCC configuration - confirmed by pin diagrams, mechanical drawings, and thermal specifications in the datasheet.