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Renesas HD4074019FS
- Part No.:
- HD4074019FS
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
HD4074019FS.pdf
- Description:
- MICROCONTROLLER, 4-BIT, OTPROM
- Quantity:
- Payment:
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Inventory:1,023
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Product details
Overview
HD4074019FS from Renesas Electronics is a CMOS 4-bit single-chip microcomputer with 16,384-word × 10-bit PROM, 992-digit × 4-bit RAM, 58 I/O pins (including 26 high-voltage I/O pins rated to 40 V), two 8-bit timer/counters, and a clock-synchronous 8-bit serial interface - designed for direct fluorescent display driving in industrial control panels and legacy instrumentation.
For engineers reviewing the HD4074019FS datasheet, HD4074019FS pinout, HD4074019FS application, or HD4074019FS equivalent, this page delivers verified technical context, package mapping, functional pin roles, real-world use cases, and validated alternative options for legacy system maintenance and replacement design.
Technical Context
The HD4074019FS implements an HMCS400-series CPU core with 14-bit program counter, 4-bit accumulator (A), B register, and dual 4-bit index registers (X/Y) supporting indirect RAM addressing. It executes instructions in 0.89–20 µs cycles using on-chip oscillator support for crystal or ceramic resonators (OSC1/OSC2).
Interrupt handling is managed via five sources - two external (INT0/INT1 multiplexed on R32/R33), two timer-based (Timer A free-running, Timer B auto-reload), and one serial - with priority-encoded vector addresses ($0002–$000C) and dedicated RAM-mapped control bits ($000–$003). The MCU supports 16-level subroutine stack with automatic PC/CA/ST push during interrupt entry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PROM size | 16,384 words × 10 bits - stores full firmware including initialization, interrupt vectors, and application code in one-time programmable memory. |
| RAM capacity | 992 digits × 4 bits - provides data storage, stack space (64 digits), and special function registers (SFRs) mapped at $000–$00B. |
| Instruction cycle time | 0.89 to 20 µs - enables real-time response in display refresh, sensor polling, and keypad scanning loops. |
| I/O count & voltage rating | 58 pins total; 26 high-voltage I/O pins rated to 40 V - allows direct connection to fluorescent display segments without external drivers. |
| Timer subsystem | Two independent 8-bit timers: Timer A (free-running), Timer B (auto-reload) - supports precise timing for display multiplexing and event counting. |
| Serial interface | Clock-synchronous 8-bit serial I/O (SCK/SI/SO multiplexed on R40–R42) - enables daisy-chain communication with peripheral controllers or status displays. |
| Power supply range | 4.5 V to 5.5 V - compatible with standard +5 V logic rails and legacy industrial power supplies. |
Pinout & Package
HD4074019FS is housed in a 64-pin flat plastic package (FP-64B), measuring 22.86 mm × 9.27 mm with 0.65 mm lead pitch. Pin functions are defined per Renesas HD404019R Series Rev. 6.0 (Sept. 1998), confirmed for HD4074019FS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Primary +5 V supply rail for core and I/O; must be decoupled near pin with 0.1 µF ceramic capacitor. |
| GND | Ground reference | Common return path for all internal circuits and I/O; requires low-impedance connection to system ground plane. |
| OSC1 / OSC2 | Crystal/resonator interface | Connects to external 455 kHz–1 MHz ceramic resonator or quartz crystal; determines instruction timing base. |
| RESET | Active-low reset input | Asynchronous reset signal; must be held low ≥100 ns after VCC stabilizes to ensure reliable initialization. |
| D0–D15 | Bit-addressable I/O port | D0–D3: standard CMOS I/O; D4–D15: high-voltage (40 V) open-drain outputs for fluorescent segment drive. |
| R00–R93, RA0–RA1 | Multiplexed I/O and function pins | Includes INT0/INT1 (R32/R33), SCK/SI/SO (R40–R42), and Vdisp (RA1) - configurable per mask option for NMOS/PMOS/pull-up/pull-down modes. |
| TEST | Factory test pin | Internally tied to VCC during normal operation; must be externally connected to VCC to enable functional mode. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage I/O capability | 26 pins support up to 40 V output - eliminates need for external segment drivers in fluorescent display systems. |
| On-chip oscillator circuit | Supports crystal or ceramic resonator (455 kHz–1 MHz) - reduces BOM count and board space vs. external clock generator. |
| Five-source interrupt system | Hardware-prioritized vector interrupts (RESET, INT0, INT1, Timer A/B, Serial) - enables deterministic real-time response without polling overhead. |
| 16-level hardware stack | Automatic 4-digit push/pop of PC/CA/ST on interrupt or CAL - ensures reliable nested subroutine and interrupt handling in safety-critical sequences. |
| Low-power standby/stop modes | Standby retains RAM and enables interrupts while halting CPU; Stop retains RAM with zero current draw - extends battery life in portable instruments. |
Applications
| Fluorescent Display Control Panel | Industrial Process Monitor |
|---|---|
Use Scenario: Driving 16-segment fluorescent displays in HVAC control interfaces with manual key input and analog sensor feedback. IC Role / Device Role / Timing Role: Primary controller executing display refresh, keypad scan, and ADC result processing at 100 Hz update rate. Use Value: High-voltage D-port pins directly sink segment current up to 40 V, eliminating discrete driver transistors and reducing thermal stress on PCB. |
Use Scenario: Monitoring temperature, pressure, and flow in factory-floor machinery with local alarm triggering and LED status indication. IC Role / Device Role / Timing Role: Real-time data acquisition hub coordinating analog front-end sampling, digital I/O control, and serial reporting to PLC master. Use Value: Dual 8-bit timers provide independent timing for sensor sampling intervals and watchdog timeout detection without external components. |
| Legacy Test Equipment UI | Electromechanical Relay Sequencer |
Use Scenario: User interface for benchtop multimeters and LCR meters requiring alphanumeric display, rotary encoder input, and calibration menu navigation. IC Role / Device Role / Timing Role: Main MCU managing display rendering, nonvolatile parameter storage, and serial communication with PC host. Use Value: 16,384-word PROM stores full firmware including font tables and calibration constants - avoids external EPROM and simplifies field updates. |
Use Scenario: Timing-critical sequencing of industrial relays in packaging line controls, where precise ON/OFF durations prevent mechanical wear. IC Role / Device Role / Timing Role: Deterministic sequencer using Timer B auto-reload mode to generate accurate 10–500 ms relay actuation windows. Use Value: Hardware timer interrupt guarantees ±1 µs timing accuracy across voltage and temperature variations - critical for repeatable machine motion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HD404019RFS | Mask ROM version (16,384-word × 10-bit); identical FP-64B package and pinout; 3.5–6.0 V supply range. | Fixed firmware only; no field reprogramming capability - suitable for high-volume, unchanging designs. | Select HD404019RFS when firmware is finalized and production volume justifies mask cost; HD4074019FS preferred for prototyping or low-volume customization. |
| HD407L4019H | Low-voltage PROM variant; 3.0–5.5 V operation; FP-64A package (same footprint, different lead form); identical instruction set and memory map. | Enables mixed-voltage systems with 3.3 V peripherals; requires revised power rail design but retains software compatibility. | Choose HD407L4019H when integrating with 3.3 V sensors or logic; verify Vdisp functionality remains valid at reduced VCC. |
Compared with HD404019RFS and HD407L4019H, the HD4074019FS uniquely balances one-time programmability, +5 V compatibility, and FP-64B package - making it optimal for retrofitting legacy 5 V industrial panels where firmware iteration is needed but board layout cannot change.
Availability
HD4074019FS is available at Aetrix Electronics and suitable for industrial process monitors, fluorescent display control panels, legacy test equipment UIs, and electromechanical relay sequencers requiring stable component supply and long-term obsolescence management.
Supply support for HD4074019FS 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 devices for industrial, automotive, and infrastructure markets.
The HD4074019FS belongs to the HMCS400-series 4-bit microcontroller family, originally developed by Hitachi and continued by Renesas to serve cost-sensitive, high-reliability applications in legacy instrumentation and display systems.
FAQ
What is the maximum operating voltage for high-voltage I/O pins on the HD4074019FS?
The HD4074019FS features 26 high-voltage I/O pins rated to 40 V maximum - specifically D4–D15 and selected R-port pins (R0, R1, R2, RA). These pins support direct fluorescent display segment driving without external level-shifting components. Operation above 40 V risks permanent damage to the internal PMOS open-drain structure. Always verify Vdisp pin configuration when using high-voltage outputs.
Does the HD4074019FS support in-system programming or field firmware updates?
No, the HD4074019FS contains one-time programmable PROM and does not support in-system programming. Firmware must be programmed prior to soldering using a compatible PROM programmer (e.g., BP Microsystems or Xeltek units with HMCS400 socket adapter). Once programmed, code cannot be modified - design verification and thorough testing are required before final programming of the HD4074019FS.
What oscillator configurations are supported by the HD4074019FS?
The HD4074019FS supports three oscillator modes via OSC1 and OSC2 pins: ceramic resonator (455 kHz–1 MHz), quartz crystal (455 kHz–1 MHz), or external clock input. No external capacitors are required for ceramic resonators; crystal operation requires 12–22 pF load capacitors. Oscillator stabilization time is ≤100 ms after power-on, and the device enters reset until oscillation is confirmed.
How many interrupt sources does the HD4074019FS have, and what are their priorities?
The HD4074019FS has five interrupt sources: RESET (highest priority), INT0, INT1, Timer A, Timer B, and Serial (lowest priority). Priority is hardwired in hardware and maps to fixed vector addresses ($0000–$000C). Each source has dedicated interrupt request flag (IF) and mask (IM) bits in RAM locations $000–$003. The global interrupt enable (IE) bit must be set to activate any masked source.
Is the HD4074019FS pin-compatible with other members of the HD404019R series?
Yes, the HD4074019FS shares identical pinout and package (FP-64B) with HD404019RFS, HD407L4019H, and HD4074019H. All variants use the same 64-pin flat plastic footprint and electrical pin definitions. However, supply voltage ranges differ: HD4074019FS requires 4.5–5.5 V, while HD407L4019H operates from 3.0–5.5 V - verify power rail compatibility before substitution.
HD4074019FS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
HD4074019FS FAQ
1.How can I place an order for HD4074019FS through Aetrix?
Please submit a Request for Quotation (RFQ) for HD4074019FS on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for HD4074019FS reliable?
The price and inventory of HD4074019FS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HD4074019FS is usually 5 days.
3.What payment methods are accepted for HD4074019FS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HD4074019FS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HD4074019FS?
HD4074019FS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HD4074019FS order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for HD4074019FS?
For technical support, including HD4074019FS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HD4074019FS requirements.
6.How does Aetrix verify that HD4074019FS is sourced from the original manufacturer or authorized distributors?
All HD4074019FS products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that HD4074019FS meets industry standards.
7.What is the process for return or replacement of HD4074019FS?
All HD4074019FS units undergo pre-shipment inspection (PSI). If there is an issue with HD4074019FS, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The HD4074019FS part is unused and in its original packaging.
Return procedure for HD4074019FS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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