Renesas IDT79RC64T575-250DP

Overview

IDT79RC64T575-250DP from Integrated Device Technology is a 64-bit embedded microprocessor operating at 250 MHz, delivering >330 Dhrystone MIPS and 666 MFLOPS/s (single/double precision), with 32 kB two-way set-associative instruction and data caches, MIPS-IV ISA compliance including DSP extensions, and 64-bit SysAd bus interface for high-bandwidth embedded systems such as digital set-top boxes and internetworking equipment.

For engineers reviewing the IDT79RC64T575-250DP datasheet, IDT79RC64T575-250DP pinout, IDT79RC64T575-250DP application, or IDT79RC64T575-250DP equivalent, key selection criteria include its 250 MHz pipeline clock (2×–8× SysClock multiplier), 208-pin QFP package with 64-bit bus compatibility to RC4650/RC64475, JTAG boundary scan support, 2.5 V core with 3.3 V tolerant I/O, and industrial temperature range (−40°C to +85°C).

Technical Context

The IDT79RC64T575-250DP implements a limited dual-issue superscalar architecture with a 5-stage integer pipeline and separate floating-point ALU and DIV/SQRT units, enabling concurrent execution of one integer and one floating-point instruction per cycle when no resource conflicts occur. It supports both big- and little-endian operation and features an on-chip 48-entry, 96-page TLB compliant with RC5000 memory management.

Its system interface uses a 64-bit multiplexed SysAd bus with 8-bit parity (SysADC), programmable write address-to-data delay (0–7 SysClock cycles), and boot-time configurable bus width (32/64-bit), pipelined writes, and write re-issue protocols to double effective write bandwidth. The integrated PLL multiplies SysClock (33–125 MHz) by integer factors 2–8 to generate the 250 MHz PClock.

Key Specifications

Pinout & Package

The IDT79RC64T575-250DP is housed in a 208-pin Plastic Quad Flat Package (QFP) with 0.5 mm pitch, optimized for thermal dissipation in industrial embedded applications (θ_CA = 20°C/W at 0 ft/min airflow). Pin functions are defined per IDT DSC 5607 Rev. Dec 2001.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 64-bit embedded microprocessor applications.

Compared with IDT79RC64T575-250DP, the IDT79RC64575-200DP trades 50 MHz for reduced power and thermal load while retaining identical architecture and pinout, whereas the IDT79RC64475-250DP offers same-speed operation but with half the cache, no DSP extensions, and older microarchitecture-making it unsuitable for new designs targeting MIPS-IV efficiency or real-time DSP workloads.

Availability

IDT79RC64T575-250DP is available at Aetrix Electronics and suitable for digital set-top box development, high-end internetworking router design, and industrial graphics terminal manufacturing requiring stable component supply across extended product lifecycles.

Supply support for IDT79RC64T575-250DP 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) is a fabless semiconductor company specializing in high-performance timing, memory interface, RF, and embedded processor solutions for communications, computing, and industrial markets.

IDT79RC64T575-250DP belongs to the RISCore5000 family of socket-compatible 64-bit embedded microprocessors, designed specifically to deliver scalable MIPS-IV performance with integrated DSP and FPU acceleration for bandwidth-constrained, real-time embedded systems.

FAQ

What is the maximum operating frequency of the IDT79RC64T575-250DP?

The IDT79RC64T575-250DP operates at a guaranteed maximum pipeline clock frequency of 250 MHz, achieved by configuring its internal PLL to multiply a 33–125 MHz system clock input by an integer factor of 2–8. This 250 MHz rating is validated across the industrial temperature range (−40°C to +85°C) and under specified voltage conditions (2.5 V ±0.2 V core).

Does the IDT79RC64T575-250DP support both big-endian and little-endian operation?

Yes, the IDT79RC64T575-250DP supports runtime-selectable big-endian or little-endian data ordering via bit 8 of the boot-time serial mode stream. This setting is latched at reset and determines byte alignment for all memory accesses, instruction fetches, and peripheral interactions-enabling compatibility with diverse operating systems and legacy software stacks.

How does the cache locking feature function in the IDT79RC64T575-250DP?

The IDT79RC64T575-250DP implements per-line cache locking for both its 32 kB instruction and 32 kB data caches. When enabled, specific cache lines remain resident and immune to eviction during subsequent cache fills, ensuring deterministic access latency for time-critical code sections or real-time data buffers-critical for hard real-time embedded applications.

What package type and pin count does the IDT79RC64T575-250DP use?

The IDT79RC64T575-250DP is packaged in a 208-pin Plastic Quad Flat Package (QFP) with 0.5 mm lead pitch. This package is pin-compatible with the IDT79RC64475 and IDT79RC4650, supporting direct socket upgrades in existing 64-bit bus designs while providing thermal performance validated for industrial ambient conditions.

Is the IDT79RC64T575-250DP compatible with standard JTAG debugging tools?

Yes, the IDT79RC64T575-250DP fully complies with IEEE 1149.1 (JTAG) boundary-scan standards. Its dedicated TDI, TDO, TMS, TCK, and TRST* pins-along with JTAG32* for bus-width selection-enable seamless integration with industry-standard debug probes, programmers, and board-test equipment for verification, firmware loading, and in-system diagnostics.