Renesas IDT79RC64V474-200DZ

Overview

IDT79RC64V474-200DZ from Integrated Device Technology (IDT) is a 64-bit RISCore4000-based embedded microprocessor operating at 200 MHz, delivering 264 Dhrystone MIPS and 100 MFLOPS (single/double precision), with 16KB instruction and 16KB data caches, 32-bit external bus interface, and industrial temperature support (–40°C to +85°C). It targets internetworking equipment including switches and routers requiring deterministic real-time response and low-cost 32-bit memory subsystems.

For engineers reviewing the IDT79RC64V474-200DZ datasheet, IDT79RC64V474-200DZ pinout, IDT79RC64V474-200DZ application, or IDT79RC64V474-200DZ equivalent, key selection considerations include its 128-pin QFP package, 32-bit bus compatibility with RC4640, cache locking for real-time code/data retention, JTAG boundary scan for board-level testability, and MIPS-III ISA software compatibility across the RISController family.

Technical Context

The IDT79RC64V474-200DZ implements a streamlined 5-stage scalar pipeline with minimized branch and load delays, supporting full MIPS-III Instruction Set Architecture for 64-bit operation and upward binary compatibility with earlier RISController parts. Its integer unit executes single-cycle ALU operations and integrates an autonomous multiply/divide unit, while the on-chip floating-point coprocessor (CP1) supports IEEE 754 single- and double-precision arithmetic with separate multiply and add/convert/divide/sqrt units.

Memory management is handled by a 96-entry fully associative TLB with per-entry page size configuration (4KB–16MB) and lockable entries for deterministic real-time access. The system interface uses a 32-bit multiplexed SysAD[31:0] bus with 4-bit parity (SysADC[6:0]), boot-time configurable write address-to-data delay (0–7 MasterClock cycles), and pipelined/non-block write protocols compatible with RC4640 timing.

Key Specifications

Pinout & Package

Package: 128-pin plastic quad flat pack (QFP), 20 mm × 20 mm body, 0.65 mm lead pitch, industrial temperature grade (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT79RC64V474-200DZ, the -250DZ offers +25% performance headroom within identical footprint and power envelope, while the RC4640-200DZ sacrifices 64-bit capability and real-time determinism for lower gate count and BOM cost - making the -200DZ optimal for balanced MIPS, FPU, and RT features in space-constrained industrial designs.

Availability

IDT79RC64V474-200DZ is available at Aetrix Electronics and suitable for internetworking equipment, industrial protocol gateways, medical imaging controllers, and multimedia set-top boxes requiring stable component supply across extended product lifecycles.

Supply support for IDT79RC64V474-200DZ 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 (IDT) was a fabless semiconductor company specializing in high-performance timing, memory interface, RF, and embedded processor solutions before its acquisition by Renesas Electronics in 2019.

IDT79RC64V474-200DZ belongs to the RISController™ family of embedded microprocessors, designed specifically for high-bandwidth, real-time applications in networking, telecom infrastructure, and multimedia systems requiring MIPS-III compatibility and deterministic cache/TLB behavior.

FAQ

What is the maximum operating frequency of the IDT79RC64V474-200DZ?

The IDT79RC64V474-200DZ is rated for a maximum pipeline clock (PClock) frequency of 200 MHz, achieved by multiplying a 25–100 MHz MasterClock input using the on-chip PLL. This 200 MHz operation yields 264 Dhrystone MIPS and 100 MFLOPS peak performance. The part number suffix "-200" explicitly denotes this speed grade, and operation beyond 200 MHz is not guaranteed or supported.

Does the IDT79RC64V474-200DZ support 64-bit external data transfers?

No, the IDT79RC64V474-200DZ supports only a 32-bit external system interface via SysAD[31:0], as confirmed by its 128-pin QFP package and explicit documentation stating "RC64474 available in 128-pin QFP package, for 32-bit only systems." The 64-bit bus capability is exclusive to the RC64475 variant in the 208-pin QFP package.

Is the IDT79RC64V474-200DZ pin-compatible with the RC4640 series?

Yes, the IDT79RC64V474-200DZ is 100% pin-compatible with the RC4640 series, including IDT79RC4640-200DZ. This compatibility extends to mechanical footprint, signal assignment, power/ground pinout, and boot-mode interface, enabling direct PCB-level replacement without layout changes - a key migration path documented in IDT's datasheet revision history and feature summaries.

What thermal specifications apply to the IDT79RC64V474-200DZ?

The IDT79RC64V474-200DZ is qualified for industrial temperature operation with a case temperature range of –40°C to +85°C. Its 128-pin QFP package incorporates a drop-in heat spreader, and thermal resistance (∅CA) ranges from 20°C/W (no airflow) to 6°C/W (1000 ft/min airflow). Power dissipation must be calculated using the maximum ICC specification to ensure TA remains within ambient limits per the equation TA = TC – P × ∅CA.

Does the IDT79RC64V474-200DZ include hardware floating-point support?

Yes, the IDT79RC64V474-200DZ integrates a full IEEE 754-compliant floating-point coprocessor (CP1) supporting both single- and double-precision arithmetic. This on-chip FPU delivers 100 MFLOPS peak at 200 MHz and operates in parallel with the integer unit, eliminating software emulation overhead for applications such as digital signal processing, graphics transformation, or cryptographic computation.