Renesas 7133SA25PF

Overview

7133SA25PF from IDT is a high-speed 2K × 16 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, BUSY output flag (open-drain), and separate upper/lower byte write control per port. It supports 25 ns max access time, operates at 5V ±10%, and enables error-free 32-bit+ memory expansion when paired with IDT7143 SLAVE devices in industrial temperature range (–40°C to +85°C).

For engineers reviewing the 7133SA25PF datasheet, 7133SA25PF pinout, 7133SA25PF application, or 7133SA25PF equivalent, key selection criteria include its MASTER arbitration capability, open-drain BUSY output requiring pull-up, dual independent asynchronous ports, 25 ns read cycle time, and compatibility with 68-pin PLCC packaging for embedded real-time systems.

Technical Context

The 7133SA25PF implements fully asynchronous dual-port operation with independent 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 BUSYL or BUSYR to stall the lower-priority port.

As a MASTER device, it drives BUSY as an open-drain output (requiring external pull-up), while SLAVE devices like IDT7143 use BUSY as an input for write inhibition. The device supports battery backup data retention at 2V only in LA variants - not applicable to this SA version.

Key Specifications

Pinout & Package

7133SA25PF is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), designated PLG68. The package measures approximately 0.95 in × 0.95 in × 0.17 in and requires both VCC pins connected to 5V and both GND pins grounded for reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7143SA25PF and CY7C136-25JC, the 7133SA25PF uniquely provides MASTER arbitration with open-drain BUSY outputs and byte-selectable write control - making it irreplaceable in scalable, multi-chip dual-port memory architectures requiring deterministic contention resolution.

Availability

7133SA25PF is available at Aetrix Electronics and suitable for industrial automation, avionics data interfaces, real-time multi-CPU communication, and digital signal processing buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7133SA25PF 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 timing, memory interface, RF, and high-performance silicon solutions, now part of Renesas Electronics.

The IDT7133/7143 family was designed specifically for deterministic, low-latency inter-processor communication in industrial, military, and telecom systems requiring hardware-arbitrated dual-port memory with expandable data width.

FAQ

What is the function of the BUSY pin on the 7133SA25PF?

The BUSY pin on the 7133SA25PF is an open-drain output that signals port contention when both left and right ports attempt to access the same memory location simultaneously. As a MASTER device, it asserts BUSYL or BUSYR to stall the lower-priority port. External pull-up resistors are mandatory for proper logic-level operation. This hardware arbitration prevents data corruption without software intervention.

Does the 7133SA25PF support battery backup data retention?

No, the 7133SA25PF does not support battery backup data retention. That feature is exclusive to the LA (low-power) variants such as IDT7133LA25PF, which guarantee data retention at VCC = 2V. The "SA" suffix denotes standard-power operation, with typical active current of 1150 mW and standby current of 5 mW at 5V - optimized for performance, not ultra-low-power hold modes.

Can the 7133SA25PF be used as a standalone dual-port RAM without a SLAVE device?

Yes, the 7133SA25PF functions fully as a standalone 2K × 16 dual-port RAM with complete arbitration, BUSY signaling, and independent port control. Its MASTER capability is optional - it operates identically in single-chip configurations. The SLAVE (IDT7143) is required only when expanding data bus width beyond 16 bits, such as building 32-bit or 64-bit memory systems where the 7133SA25PF coordinates arbitration across multiple devices.

What is the significance of the "PF" suffix in 7133SA25PF?

The "PF" suffix in 7133SA25PF designates the 68-pin Plastic Leaded Chip Carrier (PLCC) package - specifically the PLG68 variant. This distinguishes it from other available packages including 68-pin ceramic PGA (PG), 68-pin flatpack (FP), and 100-pin TQFP (PNG100). All variants share identical electrical specifications and pin functions, but mechanical dimensions and mounting requirements differ.

How does the 7133SA25PF handle simultaneous write operations to the same address?

When both ports attempt to write to the same address, the 7133SA25PF's on-chip arbitration logic grants access to the port that asserts its chip enable (CEL or CER) first, based on internal timing priorities. The contending port receives a BUSY signal, which gates its write enable internally - preventing the write from executing. The stalled port must wait until BUSY deasserts before retrying, ensuring atomic memory updates and eliminating race conditions in real-time systems.