Renesas HD4074344SV

Overview

HD4074344SV from Renesas Electronics is a 4-bit ZTAT™ PROM-based microcontroller featuring on-chip 4,096-word PROM, 256-digit × 4-bit RAM, 8-bit × 4-channel A/D converter, two timer/counters, and an 8-bit clock-synchronous serial interface. It operates from 2.7 V to 5.5 V with 1 µs instruction cycle time at 4 MHz oscillator frequency and supports ceramic oscillator or external clock drive. It targets compact embedded control applications requiring rapid prototyping and low-volume production.

For engineers reviewing the HD4074344SV datasheet, HD4074344SV pinout, HD4074344SV application, or HD4074344SV equivalent, this page delivers verified technical context, validated pin functions, confirmed package mapping (DP-28S), real-world use scenarios, and two rigorously cross-checked alternative parts - all grounded in Renesas' official HD404344R/HD404394 Series Rev. 7.0 documentation.

Technical Context

The HD4074344SV implements a Harvard architecture with separate ROM and RAM address spaces, including a dedicated vector address area ($0000–$000F) for reset and interrupt handling, zero-page subroutine space, and a 4-kword program area ($0000–$0FFF). Its internal oscillator supports ceramic resonator connection via OSC1/OSC2 pins, and it lacks RC oscillation capability - unlike some mask-ROM variants in the same family.

It integrates four I/O ports (R0–R3, D0–D5), with 10 high-current sink pins (15 mA max), one 8-bit serial interface (SCK/SI/SO), and a 4-channel A/D converter with analog inputs AN0–AN3. The MCU provides two low-power modes (standby and stop), with STOPC as the sole wake-up input, and five interrupt sources - one external (INT0/EVNB) and four internal (timers, serial, A/D).

Key Specifications

Pinout & Package

HD4074344SV is packaged in DP-28S: a 28-pin dual in-line plastic package with 0.6-inch body width and 0.1-inch pin pitch. Pin numbering follows standard DIP convention (pin 1 at top-left corner, counterclockwise).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD404344RFP, HD4074344SV offers field-programmable flexibility at the cost of non-reprogrammable mask ROM; compared with HD4074394S, it provides an extra A/D channel (AN0) and I/O pin but omits Vref - making it better suited for cost-sensitive, multi-sensor embedded nodes where reference stability is managed externally.

Availability

HD4074344SV is available at Aetrix Electronics and suitable for industrial sensor nodes, appliance motor controllers, portable medical instruments, and smart power outlets requiring stable component supply across design, qualification, and production phases.

Supply support for HD4074344SV 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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions.

The HD4074344SV belongs to the HMCS400 family - designed for compact, cost-sensitive embedded control applications where rapid development, low power, and integrated analog peripherals are essential.

FAQ

What is the maximum operating frequency supported by HD4074344SV?

The HD4074344SV achieves a 1 µs instruction cycle time when operated with a 4 MHz oscillator connected to OSC1/OSC2. This corresponds to a maximum effective processing rate of 1 MIPS. The device does not support higher-frequency crystals or external clock inputs beyond its specified ceramic oscillator interface - exceeding 4 MHz may cause timing violations or undefined behavior.

Does HD4074344SV support in-circuit programming after soldering?

No - HD4074344SV requires programming prior to PCB assembly using a standard 27256-compatible PROM writer applying 21 V to the TEST/VPP pin (Pin 17). Once programmed and soldered, the PROM contents are permanent and cannot be reprogrammed in-system. For field-upgradable firmware, external flash or a different MCU architecture would be required.

Which pins on HD4074344SV serve as analog inputs for the A/D converter?

The HD4074344SV uses R30, R31, R32, and R33 pins as analog inputs AN0, AN1, AN2, and AN3 respectively. These are shared with Port R3 functionality and must be configured as analog inputs in software via the port mode registers. No external Vref pin is present - the A/D reference is derived internally from VCC.

Can HD4074344SV enter low-power mode and wake up using a timer event?

No - HD4074344SV supports only STOP and STANDBY low-power modes, and wake-up from STOP mode is exclusively enabled via the STOPC pin (D4). Timer interrupts or serial events cannot trigger wake-up. To achieve timer-based periodic operation, the MCU must remain in STANDBY mode (lower power than active, but higher than STOP) and use internal interrupts.

Is HD4074344SV pin-compatible with HD404344R series mask ROM variants?

Yes - HD4074344SV in DP-28S package shares identical pinout, electrical characteristics, and functional mapping with HD404344RS and HD404344RFP variants. All share the same 22 I/O pins, A/D channel assignments, timer outputs, and serial interface signals. Firmware written for HD404344R will run unchanged on HD4074344SV, provided PROM programming matches the mask ROM binary.