Renesas HD4074818HV

Overview

HD4074818 from Renesas Electronics is a 4-bit single-chip microcomputer with 8,192-word × 10-bit PROM, 1,184-digit × 4-bit RAM, LCD controller/driver (32 segments × 4 commons), dual voltage comparators (COMP0/COMP1), and 30 programmable I/O pins-including 10 high-current outputs (15 mA max). It operates at 4.0 V to 5.5 V and supports ZTAT™ rapid prototyping for embedded instrumentation and low-power display systems.

For engineers reviewing the HD4074818 datasheet, HD4074818 pinout, HD4074818 application, or HD4074818 equivalent, this page delivers verified technical context, exact package mapping (FP-80B/FP-80A/TFP-80), confirmed low-power modes (standby/stop/watch/subactive), and real-world use cases in portable meters and industrial HMI panels.

Technical Context

The HD4074818 implements the HMCS400 architecture with a 14-bit program counter, 10-bit ALU, and dedicated instruction decoder supporting CAL/RTN/RTNI subroutine calls with up to 16-level stack nesting. Its internal oscillator accepts ceramic resonators, crystals, or external clocks at 4 MHz (1 µs instruction cycle), while the 32.768-kHz watch oscillator (X1/X2) enables real-time clock functions.

It integrates three independent timer/counters (Timer A/B/C), a clock-synchronous 8-bit serial interface (SCK/SI/SO multiplexed on R0 port), six interrupt sources (two external INT0/INT1, four internal), and an LCD driver with internal bias resistors-requiring only V1/V2/V3 power pins and no external components for segment/common drive.

Key Specifications

Pinout & Package

HD4074818 is available in three 80-pin surface-mount packages: FP-80B (plastic flat), FP-80A (plastic flat), and TFP-80 (plastic thin flat). All share identical pin numbering and function mapping per Renesas documentation Rev. 2.0 (Sept. 1998).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD404818FS, HD4074818 offers field-programmable flexibility at identical ROM size and I/O count but trades off mask-ROM cost advantage; versus HD407L4818, it delivers higher performance (4 MHz vs. 0.8 MHz) at the expense of wider voltage tolerance and higher active current.

Availability

HD4074818 is available at Aetrix Electronics and suitable for portable instrumentation, industrial panel meters, and medical diagnostic handhelds requiring stable component supply across long-lifecycle product programs.

Supply support for HD4074818 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 HD4074818 belongs to the HMCS400 family of 4-bit microcomputers designed specifically for cost-sensitive, low-power embedded applications with integrated LCD and analog front-end capabilities.

FAQ

What is the maximum clock frequency supported by the HD4074818?

The HD4074818 supports a maximum main clock frequency of 4 MHz, resulting in a 1 µs instruction cycle time. This is achieved using an external crystal, ceramic resonator, or clock source connected to OSC1/OSC2. The device does not support frequencies above 4 MHz in standard-voltage operation.

Does the HD4074818 include an internal oscillator circuit?

Yes, the HD4074818 includes two internal oscillator circuits: a main clock oscillator (OSC1/OSC2) configurable for 4 MHz operation, and a dedicated 32.768-kHz watch oscillator (X1/X2) for real-time clock functions. Both require external crystals or resonators to operate.

How many I/O pins does the HD4074818 provide, and what are their drive capabilities?

The HD4074818 provides 30 I/O pins: D0–D9 (10 pins) support 15 mA high-current output for direct LED or relay drive; D10–D13 are input-only and double as voltage comparator inputs. All I/O pins are CMOS-compatible and individually programmable for pull-up configuration.

What LCD configurations does the HD4074818 support?

The HD4074818 supports static or multiplexed LCDs with up to 32 segments and 4 commons (128 segments total). It provides dedicated COM1–COM4 and SEG1–SEG32 outputs with internal bias resistors - enabling direct connection to LCD glass without external components.

Is the HD4074818 RoHS compliant?

Renesas Electronics confirms RoHS compliance for the HD4074818 per EU Directive 2011/65/EU. The device uses lead-free terminations and complies with restrictions on cadmium, hexavalent chromium, mercury, PBB, and PBDE substances as specified in Renesas' environmental documentation.