Renesas IDT79R3041-33PF8

Overview

IDT79R3041-33PF8 from Integrated Device Technology, Inc. is a 32-bit MIPS RISC microprocessor with integrated instruction cache (2 kB), data cache (512 B), programmable bus interface supporting 8-/16-/32-bit memory sub-regions, on-chip 24-bit timer, and DMA arbiter - designed for cost-sensitive embedded systems such as laser printer controllers and PDL-based imaging devices operating at 33 MHz.

For engineers reviewing the IDT79R3041-33PF8 datasheet, IDT79R3041-33PF8 pinout, IDT79R3041-33PF8 application, or IDT79R3041-33PF8 equivalent, key selection criteria include verified 33 MHz operation, PLCC-84 package compatibility, instruction/data cache sizing, bus width programmability, and absence of on-chip MMU/TLB - critical for boot-from-PROM, low-cost DRAM/SRAM interfacing, and field-upgradable memory architectures.

Technical Context

The IDT79R3041-33PF8 implements the MIPS-I ISA with a five-stage pipeline, binary compatibility with IDT79R3000A, and identical integer execution engine. It uses physical-address direct-mapped caches (2 kB instruction, 512 B data) that require no flush on context switch.

Its bus interface unit supports programmable port width per memory sub-region, extended address hold timing, bus turnaround control, and on-chip 4-deep write buffer + 4-word read buffer - enabling transparent interfacing to mixed-width memories (8-bit PROM, 16-bit font cartridge, 32-bit DRAM) without external packing logic.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT79R3041-33PF8, the IDT79R3051-33PF8 adds MMU-based virtual memory support at higher cost and power, while the IDT79RV3041-33PF8 provides identical functionality with extended thermal qualification - making the IDT79R3041-33PF8 optimal for cost-driven commercial imaging and embedded control where temperature range and MMU are not required.

Availability

IDT79R3041-33PF8 is available at Aetrix Electronics and suitable for laser printer controllers, PDL interpreter systems, and field-upgradeable imaging devices requiring stable component supply, long-lifecycle availability, and legacy MIPS RISC compatibility.

Supply support for IDT79R3041-33PF8 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 IDT79R3041-33PF8 belongs to the RISController™ family - a series of cost-optimized, highly integrated MIPS RISC microprocessors targeting low-cost embedded systems where performance-per-dollar and memory interface flexibility are critical.

FAQ

What is the maximum operating frequency of the IDT79R3041-33PF8?

The IDT79R3041-33PF8 is rated for 33 MHz operation, corresponding to a 66 MHz double-frequency ClkIn input. It achieves approximately 20 MIPS performance at this frequency when executing from on-chip instruction cache. The device is not specified for operation above 33 MHz, and timing margins do not support overclocking beyond its validated speed grade.

Does the IDT79R3041-33PF8 include an on-chip memory management unit (MMU)?

No, the IDT79R3041-33PF8 does not include an on-chip MMU or TLB. It implements the base RISController architecture with physical-address-only memory mapping, supporting kernel/user mode distinction via external address decoding rather than virtual memory translation. This simplifies software and reduces cost compared to MMU-equipped variants like the IDT79R3051-33PF8.

Can the IDT79R3041-33PF8 boot from an 8-bit PROM?

Yes, the IDT79R3041-33PF8 supports booting from 8-bit, 16-bit, or 32-bit PROMs via its programmable port width capability. The kernel configures memory sub-regions using the Port Size Control Register in CP0, enabling automatic data unpacking during instruction fetch - allowing identical firmware to run regardless of boot device width.

What package type is used for the IDT79R3041-33PF8?

The IDT79R3041-33PF8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package with cavity-down construction. This package is thermally optimized for commercial temperature operation (0°C to +85°C) and maintains pin compatibility with other members of the RISController family, including the IDT79R3051-33PF8 and IDT79RV3041-33PF8.

Is the IDT79R3041-33PF8 pin-compatible with the IDT79R3000A?

The IDT79R3041-33PF8 is not pin-compatible with the IDT79R3000A. While it shares binary instruction compatibility and the same CPU core, the IDT79R3041-33PF8 integrates multiple peripheral functions (cache, bus interface, timer, DMA arbiter) onto a single die with a different pinout - specifically designed as a superset solution requiring a new PCB layout versus discrete R3000A-based designs.