Renesas IDT79R3041-33J

Overview

IDT79R3041-33J 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 IDT79R3041-33J datasheet, IDT79R3041-33J pinout, IDT79R3041-33J application, or IDT79R3041-33J equivalent, key selection criteria include its PLCC-84 package, double-frequency clock input (ClkIn), SysClk output timing feedback, programmable bus timing control (Extended Address Hold, Bus Turn Around), and software compatibility with IDT79R3000A and RISController family members.

Technical Context

The IDT79R3041-33J implements the MIPS-I ISA with a five-stage pipeline (IF, RD, ALU, MEM, WB) and binary compatibility with the IDT79R3000A CPU core. It integrates a System Control Coprocessor (CP0) managing exception handling, physical address mapping without TLB, cache configuration, bus timing, and port width control per memory sub-region.

Its bus interface uses a multiplexed 32-bit address/data bus (A/D[31:0]) with ALE strobe, supports burst and single-word reads via a 4-deep read buffer, and eliminates write stalls using a 4-deep write buffer. Memory access is decoupled from execution speed through autonomous data packing/unpacking for 8-/16-/32-bit ports.

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 RISC microprocessor applications.

Compared with IDT79R3051-33J and IDT79R3081-33J, the IDT79R3041-33J provides the lowest entry cost and smallest die size in the RISController family while retaining full binary compatibility - making it optimal for fixed-function, cache-centric embedded applications where TLB or FP hardware adds unnecessary overhead.

Availability

IDT79R3041-33J is available at Aetrix Electronics and suitable for laser printer controllers, network protocol gateways, field-upgradeable embedded systems, and cost-optimized imaging devices requiring stable component supply across extended production lifecycles.

Supply support for IDT79R3041-33J 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 fabless 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 IDT79R3041-33J - was designed to deliver MIPS RISC performance in low-cost, thermally efficient PLCC packaging for price-sensitive embedded applications such as office equipment and industrial controllers.

FAQ

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

The IDT79R3041-33J is rated for 33 MHz operation, achieved using a double-frequency 66 MHz ClkIn signal. Its performance is specified at 20 MIPS when running at 25 MHz from cache, and it maintains timing compliance across the full commercial temperature range (0°C to +85°C) in its PLCC-84 package.

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

No, the IDT79R3041-33J does not include an MMU or TLB. It uses physical-address caching and supports kernel/user mode separation through CP0 register control, but relies on external address decoding for memory protection. This design reduces cost and complexity compared to MMU-equipped variants like the IDT79R3051-33J.

How does the IDT79R3041-33J handle mixed-width memory interfaces?

The IDT79R3041-33J uses its Port Size Control Register in CP0 to define 8-, 16-, or 32-bit port widths per physical address sub-region. During accesses, it automatically packs/unpacks data - for example, reading four bytes from a 16-bit DRAM as two sequential transfers - all transparent to software running on the IDT79R3041-33J.

What is the function of the SysClk pin on the IDT79R3041-33J?

The SysClk pin on the IDT79R3041-33J outputs a feedback-referenced system clock derived from ClkIn, used to synchronize external memory and peripheral timing. With <2 ns rise/fall time under standard test load, SysClk minimizes skew and enables reliable latch timing for ALE and bus control signals in the IDT79R3041-33J system design.

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

Yes, the IDT79R3041-33J supports booting from 8-bit, 16-bit, or 32-bit wide PROMs. Its programmable port width interface and on-chip data unpacking allow the IDT79R3041-33J to fetch initial instructions correctly regardless of PROM width - a key feature enabling flexible, low-cost system initialization without external glue logic.