Renesas HD407A4359RSI

Overview

HD407A4359RSI from Renesas Electronics is a 4-bit ZTAT™ PROM-based microcontroller in the HMCS400 family, featuring 16,384-word PROM, 512-digit × 4-bit RAM, an 8-bit × 8-channel A/D converter, three timers (including input capture), and an 8-bit clock-synchronous serial interface. It operates at 8.5 MHz with 0.47 µs minimum instruction cycle time and supports standby/stop low-power modes for embedded control in industrial instrumentation and sensor interfaces.

For engineers reviewing the HD407A4359RSI datasheet, HD407A4359RSI pinout, HD407A4359RSI application, or HD407A4359RSI equivalent, this page delivers verified technical context, package mapping to FP-44A/DP-42S, validated pin functions, real-world use scenarios, and two confirmed alternative parts - all grounded in Renesas' HD404358 Series Rev. 6.0 documentation.

Technical Context

The HD407A4359RSI implements a Harvard architecture with separate 10-bit-wide ROM and 4-bit-wide RAM buses, executing instructions via a 14-bit program counter and 4-bit ALU. Its on-chip A/D converter uses successive approximation with internal reference and supports single-ended analog inputs across AN0–AN7.

It integrates three independent timers: Timer A (event counter), Timer B (input capture), and Timer C (alarm output), each with dedicated mode registers (TMA, TMB1/TMB2, TMC) and read/write registers mapped in RAM space $00A–$00F and $00E–$00F. Serial communication uses bit-synchronous full-duplex mode with SCK/SI/SO pins and configurable clock source selection.

Key Specifications

Pinout & Package

HD407A4359RSI is available in FP-44A (flatpack, 44-pin) and DP-42S (dual in-line, 42-pin) packages. The RSI suffix denotes the FP-44A variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit microcontroller applications.

Compared with HD40A4358H, HD407A4359RSI trades mask-ROM cost for field-programmability and doubles PROM capacity; compared with HD407A4359S, it offers superior thermal dissipation and board-space efficiency in surface-mount designs.

Availability

HD407A4359RSI is available at Aetrix Electronics and suitable for industrial sensor nodes, portable test equipment, motor control interfaces, and legacy system upgrade modules requiring stable component supply and long-term lifecycle support.

Supply support for HD407A4359RSI 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 consumer applications.

The HD407A4359RSI belongs to the HMCS400-Series microcontroller product line, designed for cost-sensitive, low-power embedded control applications requiring integrated A/D, timers, and serial communication - particularly in instrumentation and factory automation.

FAQ

What is the PROM programming method supported by HD407A4359RSI?

The HD407A4359RSI uses ZTAT™ (Zero Turn Around Time) PROM technology compatible with standard 27256 EPROM programmers. Programming requires applying VPP = +21 V to the VPP pin (pin 27 in FP-44A) while sequencing address/data lines per Hitachi's ZTAT specification. HD407A4359RSI does not support in-circuit programming.

Does HD407A4359RSI support external memory expansion?

No, HD407A4359RSI lacks external bus interface signals (e.g., RD, WR, ALE, or higher-order address lines). Its architecture is self-contained with on-chip 16K PROM and 512-digit RAM; memory expansion is not possible. All code and data must reside within internal memory spaces defined in the HD404358 Series memory map.

What are the voltage requirements for the AVCC and AVSS pins on HD407A4359RSI?

AVCC must be connected to the same voltage as VCC (2.7 V to 6.0 V) and decoupled with a 0.1 µF capacitor to AVSS. AVSS must be tied to system ground at the same potential as GND. Deviation between AVCC and VCC degrades A/D linearity; the HD407A4359RSI datasheet explicitly prohibits independent AVCC regulation unless bypassed as specified.

Can HD407A4359RSI operate in stop mode while retaining RAM contents?

Yes, HD407A4359RSI retains full RAM and register contents (including stack and special function registers) during Stop mode. The oscillator is halted, and current drops to µA range. Wake-up occurs via STOPC pin assertion or RESET, restoring execution from the instruction following the STOP instruction - preserving system state without data loss.

Is HD407A4359RSI pin-compatible with other members of the HD404358 Series?

Yes, HD407A4359RSI shares identical pinouts with HD404354H, HD404356H, HD404358H, HD40A4354H, HD40A4356H, and HD40A4358H in the FP-44A package. All share the same signal assignments, electrical characteristics, and package dimensions - enabling drop-in replacement where PROM capacity and speed meet requirements.