Renesas 7133LA25PF8

Overview

7133LA25PF8 from IDT is a high-speed 2K × 16 dual-port static RAM with master arbitration logic, 25 ns maximum access time, 1050 mW typical active power, 1 µA typical standby current, and battery backup data retention at 2 V. It serves as the master port in width-expanded 32-bit+ memory systems for real-time embedded controllers requiring concurrent read/write access without external arbitration.

For engineers reviewing the 7133LA25PF8 datasheet, 7133LA25PF8 pinout, 7133LA25PF8 application, or 7133LA25PF8 equivalent, this page delivers verified timing specs (tRC = 25 ns), bus arbitration behavior (BUSY output with open-drain drive), byte-select write control (R/WLUB/R/WLLB), industrial temperature support (–40°C to +85°C), and 68-pin PLCC package compatibility.

Technical Context

The 7133LA25PF8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves simultaneous accesses to identical addresses by asserting BUSYL or BUSYR - open-drain outputs requiring external pull-up resistors - to stall the contending port.

It supports separate upper- and lower-byte write enables per port (R/WLUB/R/WLLB and R/WRUB/R/WRLB), enabling partial-word writes without read-modify-write cycles. The device enters ultra-low-power data retention mode (<1 µA) when both chip enables (CEL/CER) are high and VCC ≥ 2 V, preserving contents during battery backup.

Key Specifications

Pinout & Package

7133LA25PF8 is packaged in a 68-pin plastic leaded chip carrier (PLCC), body size ≈ 0.95 in × 0.95 in × 0.17 in, with two VCC and two GND pins requiring independent connection for reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-25PC, 7133LA25PF8 integrates arbitration and reduces BOM count; compared with IDT7143LA25PF8, it provides master functionality essential for autonomous dual-port operation and scalable width expansion.

Availability

7133LA25PF8 is available at Aetrix Electronics and suitable for real-time motion control, dual-CPU industrial PLCs, avionics display systems, and medical imaging data buffering requiring stable component supply across extended product lifecycles.

Supply support for 7133LA25PF8 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, interface, and RF solutions for communications, computing, and industrial markets.

The IDT7133/7143 family was designed specifically for deterministic, contention-free dual-processor memory sharing in real-time embedded systems - emphasizing low-latency arbitration, battery backup, and industrial-grade reliability.

FAQ

What is the function of the BUSY pins on the 7133LA25PF8?

The BUSYL and BUSYR pins on the 7133LA25PF8 are open-drain outputs that signal address contention between left and right ports. When both ports attempt simultaneous access to the same memory location, the on-chip arbitration logic asserts the corresponding BUSY pin to stall the contending port. External 4.7 kΩ pull-up resistors to VCC are required for proper operation. This feature is intrinsic to the 7133LA25PF8 as the master device in IDT's MASTER/SLAVE architecture.

Does the 7133LA25PF8 support battery backup operation, and what voltage is required?

Yes, the 7133LA25PF8 supports battery backup data retention at VCC = 2.0 V minimum, drawing only 100 µA typical current in retention mode. This allows seamless failover to backup power during main supply interruption while preserving all 32,768 bits of memory content. The specification is validated across the industrial temperature range (–40°C to +85°C) and does not require external circuitry beyond standard decoupling.

Can the 7133LA25PF8 be used as a standalone dual-port RAM without a slave device?

Yes, the 7133LA25PF8 functions fully as a standalone 2K × 16 dual-port SRAM with integrated arbitration logic. Its BUSY outputs manage internal contention, and it requires no companion device for basic operation. The slave device (IDT7143LA25PF8) is only needed when expanding data bus width beyond 16 bits - for example, to construct a 32-bit memory system - where the 7133LA25PF8 acts as master arbitrator.

What is the difference between R/WLUB and R/WLLB on the 7133LA25PF8?

R/WLUB (Read/Write Upper Byte) and R/WLLB (Read/Write Lower Byte) are independent active-low write enable controls for the left port's 16-bit I/O bus. R/WLUB governs I/O8L–I/O15L (upper byte), while R/WLLB governs I/O0L–I/O7L (lower byte). This enables partial-word writes - such as updating only status flags in the upper byte while preserving sensor data in the lower byte - without requiring a read-modify-write sequence, reducing bus traffic and latency.

Is the 7133LA25PF8 pin-compatible with other members of the IDT7133/7143 family?

Yes, the 7133LA25PF8 shares identical pinout and footprint with all IDT7133/7143 variants in the 68-pin PLCC package, including IDT7133SA25PF8, IDT7143LA25PF8, and IDT7143SA25PF8. This allows direct substitution within the same package type for speed or power grade changes - for example, upgrading from SA (standard power) to LA (low power) - without PCB redesign, provided timing and thermal constraints are re-verified.