Renesas IDT79R3041-25PF

Overview

IDT79R3041-25PF from Integrated Device Technology is a 32-bit MIPS RISC microprocessor with integrated instruction cache (2 kB), data cache (512 B), programmable bus interface, on-chip DMA arbiter, and 24-bit timer. It operates at 25 MHz, delivers 20 MIPS, and targets cost-sensitive embedded systems such as laser printers and industrial controllers requiring single-chip CPU + cache + memory interface integration.

For engineers reviewing the IDT79R3041-25PF datasheet, IDT79R3041-25PF pinout, IDT79R3041-25PF application, or IDT79R3041-25PF equivalent, key selection criteria include its 84-pin PLCC package, 25 MHz clock rating, 2 kB/512 B cache split, software- and pin-compatibility with R3000A and RISController family, and support for mixed 8-/16-/32-bit memory port widths without external logic.

Technical Context

The IDT79R3041-25PF implements the MIPS-I ISA with a five-stage pipeline and binary compatibility to the IDT79R3000A CPU core. Its execution engine sustains near single-cycle ALU operations and achieves 1.3-cycle effective load time, enabling 20 MIPS at 25 MHz when executing from cache.

It integrates a System Control Coprocessor (CP0) managing exception handling, virtual-to-physical address mapping (base architecture, no TLB), cache configuration, bus timing control, and programmable port width per memory sub-region - all configurable via CP0 registers at reset or runtime.

Key Specifications

Pinout & Package

Package: 84-pin Plastic Leaded Chip Carrier (PLCC), cavity-down, commercial temperature range (0°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit RISC microprocessor applications.

Compared with IDT79R3051-25PF and IDT79RV3041-25PF, the IDT79R3041-25PF offers the lowest BOM cost and simplest power design for fixed-function embedded applications where full MMU support or 3.3 V I/O tolerance is unnecessary - retaining identical pinout, software compatibility, and cache-enabled performance at 25 MHz.

Availability

IDT79R3041-25PF is available at Aetrix Electronics and suitable for laser printer controllers, industrial HMI terminals, networked fax servers, and embedded document scanners requiring stable component supply across long-lifecycle production programs.

Supply support for IDT79R3041-25PF 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, Inc. (IDT) was a U.S.-based semiconductor company specializing in high-performance timing, memory interface, and embedded processor solutions before its acquisition by Renesas Electronics in 2019.

The IDT79R3041-25PF belongs to the RISController™ family - designed specifically to deliver MIPS RISC performance in cost-constrained embedded systems by integrating CPU, caches, bus interface, and system peripherals onto a single die without requiring external SRAM or complex glue logic.

FAQ

What is the maximum operating frequency of the IDT79R3041-25PF?

The IDT79R3041-25PF is rated for 25 MHz operation, corresponding to a guaranteed 20 MIPS performance when executing from on-chip caches. Its double-frequency clock input requires a 50 MHz signal with 40–60% duty cycle. Operation above 25 MHz is not specified or supported - the "-25" suffix denotes its validated speed grade.

Does the IDT79R3041-25PF include a memory management unit (MMU)?

No, the IDT79R3041-25PF does not include an MMU or TLB. It implements the base RISController virtual-to-physical address mapping without page tables, supporting distinct kernel/user modes via physical address decoding only. For MMU functionality, IDT offered the pin-compatible IDT79R3051-25PF and IDT79R3081-25PF variants.

How does the IDT79R3041-25PF handle mixed-width memory interfaces?

The IDT79R3041-25PF uses its Port Size Control Register (in CP0) to partition the physical address space into sub-regions, each assigned 8-, 16-, or 32-bit port width. During accesses, the bus interface unit automatically performs data packing/unpacking - enabling boot from 8-bit PROM, font loading from 16-bit cartridges, and main memory access via 32-bit DRAM, all transparent to software.

What package type is used for the IDT79R3041-25PF?

The IDT79R3041-25PF is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC) with cavity-down construction. This package is optimized for commercial temperature range (0°C to +85°C) and provides socket compatibility with other RISController family members, including the IDT79R3051-25PF and IDT79R3081-25PF.

Is the IDT79R3041-25PF pin-compatible with the IDT79R3000A?

No - the IDT79R3041-25PF is not pin-compatible with the IDT79R3000A. While it shares binary instruction compatibility and the same CPU core, the IDT79R3041-25PF integrates caches, bus interface logic, and peripherals that require additional pins (e.g., ALE, SysClk, BE16, TC). It is, however, pin- and software-compatible with other RISController family members like the IDT79R3051-25PF.