Renesas IDT79R3041-33PFG8

Overview

IDT79R3041-33PFG8 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 33 MHz, delivers 20 MIPS at 25 MHz, supports 8-/16-/32-bit memory port widths, and targets cost-sensitive embedded systems such as laser printer controllers and low-end networking appliances.

For engineers reviewing the IDT79R3041-33PFG8 datasheet, IDT79R3041-33PFG8 pinout, IDT79R3041-33PFG8 application, or IDT79R3041-33PFG8 equivalent, key selection criteria include its PLCC-84 package, double-frequency clock input (ClkIn), SysClk output timing feedback, A/D(31:0) multiplexed address/data bus, and software compatibility with the IDT79R3000A and full RISController family.

Technical Context

The IDT79R3041-33PFG8 implements the MIPS-I ISA with a five-stage pipeline and 32×32-bit general-purpose register file. Its CPU core is binary-compatible with the IDT79R3000A, enabling direct software reuse without recompilation.

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). Pin-compatible with other RISController family members including IDT79R3051 and IDT79R3081 in same package variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT79R3041-33PFG8, the IDT79R3051-33PFG8 adds MMU support and doubles cache capacity for OS-based applications, while the IDT79R3081-33PFG8 introduces hardware FPU and larger caches - both retain software compatibility but require evaluation of thermal, layout, and firmware dependencies before substitution.

Availability

IDT79R3041-33PFG8 is available at Aetrix Electronics and suitable for laser printer controllers, low-cost networking appliances, industrial HMI terminals, and field-upgradeable embedded instruments requiring stable component supply across long-lifecycle production programs.

Supply support for IDT79R3041-33PFG8 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 RISController family, including IDT79R3041-33PFG8, was designed to deliver MIPS RISC performance in cost-constrained embedded systems - emphasizing integration, power efficiency, and memory interface flexibility over raw clock speed.

FAQ

What is the maximum operating frequency of the IDT79R3041-33PFG8?

The IDT79R3041-33PFG8 is rated for 33 MHz core operation using a 66 MHz double-frequency ClkIn input. It achieves 20 MIPS performance at 25 MHz when executing from its on-chip 2 kB instruction cache. The "33" in the part number denotes this maximum rated frequency, and operation beyond this violates commercial temperature specifications.

Does the IDT79R3041-33PFG8 include a memory management unit (MMU)?

No, the IDT79R3041-33PFG8 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 memory protection only. For MMU functionality, IDT79R3051-33PFG8 or IDT79R3081-33PFG8 must be selected instead.

How does the IDT79R3041-33PFG8 handle mixed-width memory systems?

The IDT79R3041-33PFG8 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. Its bus interface performs automatic data packing/unpacking - e.g., reading four bytes from a 16-bit DRAM as two sequential transfers - transparently to software.

What package type is used for the IDT79R3041-33PFG8?

The IDT79R3041-33PFG8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), cavity-down configuration, designated by the "PFG8" suffix. This package is pin-compatible with other RISController family members including IDT79R3051 and IDT79R3081 in PLCC form, enabling hardware scalability.

Is the IDT79R3041-33PFG8 still supported for new designs?

While IDT was acquired by Renesas in 2019, the IDT79R3041-33PFG8 remains available through authorized distributors and Aetrix Electronics for legacy program support and long-lifecycle production. No new revisions or derivatives are planned; design-in should include formal obsolescence risk assessment and migration path planning.