Renesas IDT79R3041-33PFG

Overview

IDT79R3041-33PFG 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-cost network peripherals.

For engineers reviewing the IDT79R3041-33PFG datasheet, IDT79R3041-33PFG pinout, IDT79R3041-33PFG application, or IDT79R3041-33PFG 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 IDT RISController family including R3000A and R3081.

Technical Context

The IDT79R3041-33PFG implements the MIPS-I ISA with a five-stage pipeline and 32 orthogonal 32-bit general-purpose registers. Its CPU core is binary-compatible with the IDT79R3000A, enabling reuse of existing MIPS toolchains and firmware.

It integrates a System Control Coprocessor (CP0) managing exception handling, virtual-to-physical address mapping without TLB, cache configuration, bus timing control, and programmable port width per memory sub-region. The bus interface supports burst reads via a 4-deep read buffer and eliminates write stalls using a 4-deep write buffer.

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 embedded RISC processor applications.

Compared with IDT79R3041-33PFG, IDT79R3051-33PFG offers doubled cache capacity for improved hit rates in complex firmware, while IDT79R3081-33PFG adds hardware FP and larger caches - all retain identical PLCC-84 footprint and software compatibility, enabling seamless performance scaling.

Availability

IDT79R3041-33PFG is available at Aetrix Electronics and suitable for laser printer controllers, low-cost network peripherals, industrial HMI terminals, and field-upgradeable embedded systems requiring stable component supply over extended production lifecycles.

Supply support for IDT79R3041-33PFG 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.

IDT79R3041-33PFG belongs to the RISController™ family - a series of cost-optimized, highly integrated MIPS RISC microprocessors designed for price-sensitive embedded applications where system-level integration reduces external logic, power, and board area.

FAQ

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

The IDT79R3041-33PFG is rated for 33 MHz operation, corresponding to a 66 MHz double-frequency ClkIn signal. It achieves 20 MIPS performance at 25 MHz when executing from its on-chip instruction cache. The device is not specified for operation above 33 MHz, and timing compliance must be verified against the commercial temperature range (0°C to +85°C) and PLCC-84 thermal resistance characteristics.

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

No, the IDT79R3041-33PFG does not include an MMU or TLB. It implements the base RISController architecture with fixed virtual-to-physical address mapping (kseg0–kuseg), supporting distinct kernel and user modes through physical memory protection only. This simplifies software requirements and reduces cost compared to TLB-equipped variants like the IDT79R3051 or IDT79R3081.

How does the programmable port width feature work on the IDT79R3041-33PFG?

The IDT79R3041-33PFG uses the 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 access, the bus interface unit automatically performs data packing/unpacking - e.g., reading four bytes from a 16-bit DRAM as two sequential transfers - transparently to software. This eliminates external glue logic for mixed-width memory systems.

Can the IDT79R3041-33PFG boot from an 8-bit PROM?

Yes, the IDT79R3041-33PFG supports booting directly from 8-bit, 16-bit, or 32-bit wide PROMs. This is enabled by its programmable port width interface and on-chip data unpack unit, which reconstructs 32-bit instruction words from narrower memory accesses. Boot configuration is determined by Reset Configuration Mode inputs sampled at power-on reset.

What thermal package options are available for the IDT79R3041-33PFG?

The IDT79R3041-33PFG is exclusively offered in the 84-pin PLCC ("J" package), a cavity-down injection-molded plastic leaded chip carrier rated for 0°C to +85°C case temperature. Unlike higher-speed RISController variants (e.g., R3081), it does not use the MQUAD package. Thermal resistance (θ_CA) ranges from 29°C/W (no airflow) to 15°C/W (1000 ft/min), requiring appropriate heatsinking or airflow for sustained 33 MHz operation.