Renesas DF2646RFC20JV

Overview

DF2646RFC20JV from Renesas is a mask-programmed ROM device for SH-series microcomputers, operating at 20 MHz, in a 64-pin QFP package, rated for industrial temperature range (−40°C to +85°C), and used as embedded firmware storage in industrial control systems.

For engineers reviewing the DF2646RFC20JV datasheet, DF2646RFC20JV pinout, DF2646RFC20JV application, or DF2646RFC20JV equivalent, key selection considerations include mask-ROM compatibility with SH7046/SH7047 microcontrollers, 20 MHz clock timing alignment, QFP-64 mechanical fit, and industrial-grade reliability validation per Renesas ROM ordering procedures.

Technical Context

This ROM device is configured exclusively for SH-series microcontrollers including SH7046 and SH7047, with fixed 20 MHz operation frequency and no runtime reprogrammability. It interfaces directly with the microcontroller's external bus interface using standard address/data multiplexing.

DF2646RFC20JV implements a synchronous read-only memory architecture with no internal logic-only address decoding and data output enable timing aligned to SH-series bus cycles. Timing parameters are defined relative to the SH microcontroller's φ clock input and match the 20 MHz maximum bus speed specification.

Key Specifications

Pinout & Package

DF2646RFC20JV is housed in a 64-pin QFP (plastic quad flat package) with 0.8 mm lead pitch and 14 mm × 14 mm body size. Pin numbering follows JEDEC MS-026 standard, counterclockwise from index mark.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mask-ROM applications.

Compared with DF2646RFC20JV, DF2646RFC25JV enables higher-speed SH bus operation but demands stricter timing margins, while DF2646RFD20JV shares identical packaging and speed but contains functionally distinct firmware-both require separate ROM ordering forms and checksum validation.

Availability

DF2646RFC20JV is available at Aetrix Electronics and suitable for industrial motor control, factory automation PLCs, and building management system controllers requiring stable component supply and long-term firmware consistency.

Supply support for DF2646RFC20JV 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

Renesas Electronics is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power solutions for industrial, automotive, and infrastructure markets.

DF2646RFC20JV belongs to Renesas' legacy SH-series mask-ROM product line, designed specifically to provide secure, high-reliability firmware storage for SH7046/SH7047-based embedded control systems.

FAQ

What is the primary function of DF2646RFC20JV in an SH-series microcontroller system?

DF2646RFC20JV serves as the mask-programmed boot ROM for SH7046 and SH7047 microcontrollers, storing immutable firmware that executes on power-up. Its fixed 20 MHz timing alignment ensures zero-wait-state operation, and it provides deterministic startup behavior critical for industrial control applications where firmware integrity and repeatability are mandatory. DF2646RFC20JV does not support reprogramming or runtime updates.

Is DF2646RFC20JV pin-compatible with other ROM devices in the DF2646 series?

DF2646RFC20JV shares the same 64-pin QFP package and pinout with DF2646RFC25JV and DF2646RFD20JV, but pin compatibility alone does not guarantee functional interchangeability. DF2646RFC20JV requires specific ROM ordering forms, checksum validation, and option list entries per Renesas documentation. Substituting without verifying mask option settings and firmware image compatibility may result in boot failure.

What documentation is required to order DF2646RFC20JV from Renesas?

To order DF2646RFC20JV, Renesas requires three completed forms: the Single-chip Microcomputer Specification Form (with "DF2646RFC20JV" entered in the ROM code name field), the Option List (confirming mask settings for SH7046/SH7047), and the Mark Specification Form. All forms must be downloaded from the official Renesas website and submitted with a four-digit hexadecimal checksum covering the full ROM address range.

Does DF2646RFC20JV support extended temperature operation beyond −40°C to +85°C?

No, DF2646RFC20JV is qualified and guaranteed only for the industrial temperature range of −40°C to +85°C. Renesas does not offer automotive-grade (−40°C to +125°C) or military-grade variants of this specific ROM part number. Operation outside the specified range may result in undefined timing behavior or data corruption, and is not covered by warranty or reliability testing.

Can DF2646RFC20JV be used with microcontrollers outside the SH7046/SH7047 family?

No, DF2646RFC20JV is designed exclusively for SH7046 and SH7047 microcontrollers. Its address decoding, timing parameters, and bus interface signals align precisely with those MCUs' external memory interface specifications. Using DF2646RFC20JV with other SH-series devices (e.g., SH7145) or non-SH microcontrollers will result in incorrect addressing, timing violations, or failure to boot due to incompatible bus protocols.