Renesas HD407A4359H

Overview

HD407A4359H 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 0.47 µs minimum instruction cycle time (f_OSC = 8.5 MHz) and supports standby/stop low-power modes for embedded control in industrial instrumentation.

For engineers reviewing the HD407A4359H datasheet, HD407A4359H pinout, HD407A4359H application, or HD407A4359H equivalent, key selection considerations include its 44-pin FP-44A package, PROM programmability for rapid prototyping-to-production transition, 2.7–6.0 V supply range, and integrated analog/digital peripherals for sensor-based control systems.

Technical Context

The HD407A4359H implements a Harvard architecture with separate ROM and RAM address spaces, supporting CAL/RTN subroutine calls via a 16-level stack. Its CPU includes four-bit A/B registers, two-bit W register, and four-bit X/Y/SPX/SPY registers for indirect addressing, with status and carry flags managed independently.

Peripheral integration includes a dedicated A/D converter with AVCC/AVSS isolation, event counter (EVNB), timer output (TOC), buzzer waveform generator (BUZZ), and serial interface (SCK/SI/SO) operating in clock-synchronous master mode - all controlled via memory-mapped special function registers ($004–$01F, $024–$03F) with defined R/W/W-only access policies.

Key Specifications

Pinout & Package

HD407A4359H is housed in a 44-pin plastic flat package (FP-44A), 16.0 mm × 16.0 mm body size, 1.27 mm pitch, with gull-wing leads. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise orientation from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD40A4358H, HD407A4359H trades mask ROM density for field-programmable flexibility - critical for prototyping and low-volume customization. Versus UPD78F0503GC-GAH-AX, it offers pin-compatible legacy support but lacks flash endurance and advanced peripherals.

Availability

HD407A4359H is available at Aetrix Electronics and suitable for industrial sensor nodes, appliance motor controllers, programmable power supplies, and legacy equipment retrofit modules requiring stable component supply across extended product lifecycles.

Supply support for HD407A4359H 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 global semiconductor leader specializing in microcontrollers, analog, and power solutions for industrial, automotive, and infrastructure markets.

The HD407A4359H belongs to the HMCS400-Series microcontroller line, designed specifically for cost-sensitive, low-power embedded control applications requiring integrated A/D, timers, and serial interfaces in compact 4-bit architectures.

FAQ

What is the maximum clock frequency supported by the HD407A4359H?

The HD407A4359H supports a maximum oscillator frequency of 8.5 MHz, yielding a minimum instruction cycle time of 0.47 µs when using the internal 1/4 division ratio. This timing is confirmed in the HD404358 Series Rev. 6.0 datasheet section "Features" and applies specifically to the HD407A4359H high-speed PROM variant. External clock sources must meet setup/hold timing requirements relative to the OSC1 input.

Does the HD407A4359H support in-circuit programming after soldering?

No, the HD407A4359H uses one-time-programmable (OTP) PROM technology compatible with 27256 programmers, requiring programming prior to PCB assembly. It does not support in-system programming (ISP) or in-circuit debugging interfaces. Firmware updates necessitate device replacement, making it suitable for finalized designs where field modification is unnecessary.

How is the A/D converter referenced on the HD407A4359H?

The HD407A4359H A/D converter uses AVCC as its positive reference and AVSS as its negative reference. The datasheet specifies that AVCC should be connected as close as possible to VCC and at the same voltage unless a separate analog reference is required; in that case, a 0.1 µF bypass capacitor between AVCC and AVSS is mandatory. No internal reference voltage generator is present.

Can the HD407A4359H operate from a 3.3 V supply?

Yes, the HD407A4359H operates across a 2.7 V to 6.0 V supply range, fully supporting 3.3 V nominal operation. All I/O pins are standard-voltage (not 5 V tolerant), so interfacing with 5 V peripherals requires level translation. The A/D converter maintains specified 8-bit linearity and conversion time within this voltage range per the HD404358 Series electrical characteristics table.

What packaging options are available for the HD407A4359H?

The HD407A4359H is offered exclusively in the FP-44A package: a 44-pin plastic flat package with 1.27 mm lead pitch and 16.0 mm × 16.0 mm body size. The datasheet's "Ordering Information" table confirms no DP-42S (dual in-line) variant exists for the HD407A4359H - only the HD407A4359S (DP-42S) and HD407A4359H (FP-44A) variants are listed, with H denoting the flat package.