Renesas DF61657CN35FTV

Overview

DF61657CN35FTV from Renesas Electronics is a 32-bit CISC microcontroller in the H8SX/1657 Group, featuring a 35 MHz maximum operating frequency, 512 KB on-chip Flash memory, and integrated peripherals including TPU, SCI, WDT, and DTC. It serves as a system controller in industrial automation controllers requiring deterministic real-time response and nonvolatile program storage.

For engineers reviewing the DF61657CN35FTV datasheet, DF61657CN35FTV pinout, DF61657CN35FTV application, or DF61657CN35FTV equivalent, key selection criteria include its 35 MHz CPU clock, 512 KB Flash with 10⁴ write/erase cycles, 32 KB RAM, 16-bit TPU with PWM output capability, and support for single-supply 3.3 V operation with 5 V-tolerant I/O pins.

Technical Context

The DF61657CN35FTV implements the H8SX CPU core with three operating modes (Normal, Middle, Advanced) and supports instruction fetch from on-chip Flash or external memory via the Bus State Controller (BSC). Its Clock Pulse Generator (CPG) provides internal PLL-based clock multiplication and multiple clock sources including external crystal, resonator, or oscillator input.

Interrupt handling is managed by the INTC with 128 vector entries and priority encoding; peripheral functions such as Serial Communication Interface (SCI), Watchdog Timer (WDT), and Data Transfer Controller (DTC) operate independently of CPU intervention to reduce latency in time-critical tasks.

Key Specifications

Pinout & Package

DF61657CN35FTV is housed in a 128-pin LQFP package (20 mm × 20 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow the H8SX/1657C standard layout defined in Renesas Hardware Manual Rev.2.00 (2007).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DF61657CN35FTV, R5F61656CNU35FTV offers reduced memory and no CAN, making it suitable for simpler standalone controllers, while R5F61658CNU35FTV extends connectivity at the cost of added transceiver BOM and routing complexity.

Availability

DF61657CN35FTV is available at Aetrix Electronics and suitable for industrial automation controllers, motor drive systems, and factory-floor HMIs requiring stable component supply across multi-year production cycles.

Supply support for DF61657CN35FTV 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 Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The H8SX/1657 Group targets cost-sensitive industrial control applications requiring real-time determinism, robust I/O, and long-lifecycle support - designed specifically for PLCs, motion controllers, and embedded HMIs.

FAQ

What is the maximum operating frequency of the DF61657CN35FTV?

The DF61657CN35FTV operates at a maximum frequency of 35 MHz, achieved via internal PLL multiplication of an external crystal or resonator input. This frequency is guaranteed across the full −40°C to +85°C temperature range and 3.3 V ±0.3 V supply voltage, supporting tight real-time control loop deadlines in industrial applications. The DF61657CN35FTV's instruction cycle time is 28.6 ns at this speed.

Does the DF61657CN35FTV include on-chip Flash memory, and what is its endurance rating?

Yes, the DF61657CN35FTV integrates 512 KB of on-chip Flash memory rated for 10,000 write/erase cycles and data retention of 20 years at 85°C. This Flash supports in-application programming (IAP) and includes security features such as boot area locking and flash protection registers. The DF61657CN35FTV uses this memory for both program storage and parameter retention without external EEPROM.

Is the DF61657CN35FTV compatible with 5 V logic interfaces?

Yes, the DF61657CN35FTV features 5 V-tolerant input pins on all general-purpose I/O ports, allowing direct connection to 5 V TTL or CMOS logic without external level shifters. However, its I/O output voltage swing is limited to 3.3 V, and the device itself operates from a single 3.3 V supply. This tolerance simplifies integration with legacy 5 V sensor or actuator interfaces in the DF61657CN35FTV-based design.

What peripheral modules are integrated into the DF61657CN35FTV?

The DF61657CN35FTV integrates a 16-bit Timer Pulse Unit (TPU), Serial Communication Interface (SCI), Watchdog Timer (WDT), Data Transfer Controller (DTC), Programmable Pulse Generator (PPG), and Bus State Controller (BSC). These peripherals enable real-time PWM generation, UART/RS-232 communication, autonomous memory transfers, and external memory interfacing - all without CPU overhead. The DF61657CN35FTV does not include CAN or USB controllers.

What package type and pin count does the DF61657CN35FTV use?

The DF61657CN35FTV is supplied in a 128-pin LQFP package (20 mm × 20 mm, 0.5 mm pitch) with exposed thermal pad. This package matches the pinout of other H8SX/1657C-series devices, enabling footprint compatibility across variants. The DF61657CN35FTV's pin assignments are fully documented in the Renesas H8SX/1657 Group Hardware Manual Rev.2.00 (2007), including dedicated power/ground pairs and 5 V-tolerant I/O groupings.