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Renesas HD4074394SV
- Part No.:
- HD4074394SV
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
HD4074394SV.pdf
- Description:
- MCU, 4-BIT, EPROM
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Product details
Overview
HD4074394SV from Renesas Electronics is a 4-bit ZTAT™ PROM-based microcontroller in the HMCS400 family, designed for compact embedded control with integrated A/D conversion, dual timers, and serial interface. It features 4,096-word PROM, 256-digit × 4-bit RAM, 21 I/O pins (including 5 high-current NMOS open-drain outputs), and operates from 2.7 V to 5.5 V at 1 µs instruction cycle (fOSC = 4 MHz). It targets low-power industrial sensor interfaces and appliance control systems.
For engineers reviewing the HD4074394SV datasheet, HD4074394SV pinout, HD4074394SV application, or HD4074394SV equivalent, key selection considerations include its 8-bit × 3-channel A/D converter with dedicated Vref pin, ceramic oscillator support, two low-power modes (standby/stop), and NMOS open-drain I/O architecture optimized for direct LED or relay drive without external buffers.
Technical Context
The HD4074394SV implements a Harvard-architecture 4-bit CPU core with 14-bit program counter, 10-bit stack pointer, and ALU supporting bit-manipulation instructions. Its memory map includes vector address area ($0000–$000F), zero-page subroutine space ($0000–$003F), and 4-kword PROM program area ($0000–$0FFF).
It integrates a clock-synchronous 8-bit serial interface (1 channel), two independent timer/counters (free-running + reload), one event counter with programmable edge detection, and a watchdog timer. The A/D converter uses an internal ladder resistor network referenced to the dedicated Vref pin, enabling precise 8-bit conversions across three analog inputs (AN1–AN3).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 4-bit Harvard CPU with 14-bit PC, 10-bit SP, and bit-manipulation instruction set |
| PROM Capacity | 4,096 words × 10 bits - enables field-programmable firmware via standard PROM writer (27256-compatible) |
| RAM Size | 256 digits × 4 bits - supports register banking, stack (max 16 levels), and data storage for real-time control |
| A/D Converter | 8-bit × 3 channels (AN1–AN3) with external Vref pin - allows ratiometric measurement and noise-immune analog sensing |
| I/O Configuration | 21 total pins: 3 intermediate-voltage NMOS open-drain + 5 high-current (15 mA sink) NMOS open-drain - drives LEDs, relays, or logic directly |
| Timing Performance | 1 µs instruction cycle at 4 MHz oscillator - delivers deterministic real-time response for sub-millisecond control loops |
| Power Management | Standby and Stop modes with single-pin wake-up (STOPC) - reduces active current to µA range for battery-powered operation |
Pinout & Package
HD4074394SV is available in DP-28S (28-pin plastic DIP), FP-28DA (28-pin flatpack), and FP-30D (30-pin flatpack) packages. Pin functions are identical across packages, with NC pins added in FP-30D for mechanical compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 16 / 18) | Power supply input | Primary 2.7–5.5 V supply rail; decoupling required near pin for stable A/D and timing operation |
| GND (Pin 11) | Ground reference | Analog/digital common return; separate grounding not implemented - requires careful PCB layout for mixed-signal integrity |
| OSC1 / OSC2 (Pins 9, 10) | Ceramic oscillator interface | Supports parallel-resonant ceramic resonator (e.g., 4 MHz); OSC1 accepts external clock if oscillator disabled |
| RESET (Pin 18 / 20) | Active-low reset input | Asynchronous reset asserting on falling edge; internal pull-up ensures reliable power-on initialization |
| TEST/VPP (Pin 17 / 19) | Programming voltage input | Must be tied to GND in normal operation; supplies 12.5 V during PROM programming via compatible writer |
| D0–D5 (Pins 23–28 / 25–30) | General-purpose I/O port | D1/D2 support 15 mA sink - suitable for driving LEDs or small solenoids without external drivers |
| R00–R03, R10–R13, R20–R23, R31–R33 | Multiplexed I/O ports | R10–R12: intermediate-voltage NMOS open-drain; R13–R23: 15 mA sink NMOS open-drain - enables level-flexible peripheral interfacing |
| Vref (Pin 12 / 13) | A/D reference voltage input | External precision reference for 8-bit ADC - improves accuracy vs. internal VCC-referenced designs |
| AN1–AN3 (Pins 13–15 / 14–16) | Analog input channels | Three dedicated 8-bit A/D inputs; no AN0 - differs from HD4074344SV which includes AN0–AN3 |
| INT0 / EVNB / STOPC (Pins 23 / 23 / 27) | Interrupt and wake-up inputs | Edge-selectable external interrupt (INT0), event counter trigger (EVNB), and stop-mode exit (STOPC) - all support asynchronous wake-up |
| SCK / SI / SO (Pins 19–21) | Serial interface signals | Full-duplex synchronous serial (SPI-like) with dedicated clock, data-in, and data-out - enables sensor or display communication |
| TOC (Pin 22) | Timer output | Direct PWM or pulse output from Timer C - usable for motor control or signal generation without software overhead |
Key Features
| Feature | Design Value |
|---|---|
| ZTAT™ PROM programmability | Enables rapid firmware iteration and seamless transition from prototype (PROM) to mass production (mask ROM) without hardware change |
| 8-bit × 3-channel A/D with Vref pin | Delivers stable, ratiometric analog measurements immune to VCC fluctuations - critical for sensor accuracy in variable-supply environments |
| 5 high-current NMOS open-drain I/O pins | Drives 15 mA loads directly - eliminates external transistor buffers for indicators, buzzers, or small relays, reducing BOM count |
| Dual timer/counters with event capture | Supports simultaneous PWM generation (Timer C), interval timing (Timer B), and external pulse counting (EVNB) - consolidates multiple timing functions |
| Two low-power operating modes | Stop mode draws µA-level current with single-pin wake-up; Standby mode retains RAM while halting CPU - extends battery life in portable devices |
| Ceramic oscillator integration | Eliminates need for external crystal and load capacitors - simplifies board layout and lowers system cost versus crystal-based timing |
Applications
| Industrial Sensor Node | Home Appliance Control |
|---|---|
|
Use Scenario: Compact temperature/humidity monitoring node with local LED status and UART-to-serial bridge. IC Role / Device Role / Timing Role: Primary controller executing sensor polling, A/D conversion, LED drive, and serial protocol handling. Use Value: Integrated 3-channel A/D and 5 high-current I/O eliminate external ADC and driver ICs; ceramic oscillator reduces component count. |
Use Scenario: Microwave oven main control board managing keypad scan, display backlight, magnetron timing, and safety interlocks. IC Role / Device Role / Timing Role: Real-time safety-critical sequencer coordinating cooking cycles, door switch monitoring, and thermal cutoff. Use Value: Stop mode enables ultra-low standby power; programmable edge-detect INT0 ensures immediate response to door-open events. |
| Smart Lighting Interface | Portable Medical Device |
|
Use Scenario: DALI-compliant LED driver module with dimming control, fault reporting, and thermal monitoring. IC Role / Device Role / Timing Role: DALI physical layer controller with A/D for thermal feedback and I/O for LED status signaling. Use Value: Vref-based A/D ensures accurate thermal readings across supply variations; NMOS open-drain outputs interface natively with DALI bus. |
Use Scenario: Battery-powered blood glucose meter requiring low-power operation, analog strip reading, and LCD update. IC Role / Device Role / Timing Role: System-on-chip managing electrochemical A/D sampling, button debouncing, LCD refresh, and low-battery detection. Use Value: Standby mode extends battery life beyond 1 year; 1 µs instruction cycle ensures fast strip-read processing within tight timing windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HD4074344SV | Includes AN0–AN3 (4-channel A/D); 22 I/O pins; no Vref pin - uses VCC as A/D reference | Better suited for designs requiring fourth analog input or higher I/O count; less accurate A/D under VCC ripple | Select when fourth analog channel is needed and VCC stability is assured |
| HD404394FP | Mask ROM version (not field-programmable); same pinout, A/D, and I/O specs; no TEST/VPP pin functionality | Lower unit cost for high-volume production; requires mask ROM NRE and longer lead time | Select for cost-sensitive, high-volume deployments where firmware is finalized |
Compared with HD4074394SV, HD4074344SV adds one A/D channel but sacrifices Vref flexibility, while HD404394FP removes field-programmability to reduce cost - making HD4074394SV optimal for prototyping and low-to-medium volume applications needing precision analog sensing.
Availability
HD4074394SV is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control systems, smart lighting interfaces, and portable medical devices requiring stable component supply, long-term lifecycle support, and legacy semiconductor continuity.
Supply support for HD4074394SV 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 HD4074394SV belongs to the HMCS400 4-bit microcontroller family, designed specifically for cost-sensitive, low-power embedded control applications where integration of A/D, timers, and serial interface reduces system complexity.
FAQ
What is the maximum operating frequency and corresponding instruction cycle time for HD4074394SV?
The HD4074394SV achieves a 1 µs instruction cycle time when operated with a 4 MHz ceramic oscillator or external clock source. This timing is guaranteed across the full operating voltage range of 2.7 V to 5.5 V and ambient temperature range of –20 °C to +75 °C, enabling deterministic real-time execution for time-critical control tasks in the HD4074394SV.
Does HD4074394SV support external crystal oscillators, or is it limited to ceramic resonators?
The HD4074394SV supports both ceramic resonators (parallel-mode) on OSC1/OSC2 pins and external CMOS clock input applied to OSC1 only. It does not support series-mode crystals or Pierce configurations. The internal oscillator circuit is optimized for 4 MHz ceramic units, and external clock drive must meet TTL/CMOS voltage thresholds specified in the HD4074394SV datasheet.
How many analog input channels does HD4074394SV provide, and what is the reference configuration?
The HD4074394SV provides exactly three 8-bit analog input channels: AN1, AN2, and AN3. Unlike variants such as HD4074344SV, it excludes AN0. It uses a dedicated Vref pin (Pin 12/13) to set the A/D converter's reference voltage, enabling precise ratiometric measurements independent of VCC fluctuations - a key differentiator in the HD4074394SV.
What are the I/O drive capabilities of HD4074394SV, and which pins support high-current sinking?
The HD4074394SV offers 21 I/O pins: 3 intermediate-voltage NMOS open-drain outputs and 5 standard-voltage NMOS open-drain outputs rated for 15 mA sink current each (D1, D2, R13–R23). These pins can directly drive LEDs, small relays, or logic inputs without external buffers - a defining feature of the HD4074394SV's system-integration advantage.
Is HD4074394SV pin-compatible with other members of the HD404394 series, such as HD404394FP?
Yes, HD4074394SV shares identical pinout, electrical characteristics, and functional register mapping with mask-ROM variants like HD404394FP and HD404394S across DP-28S, FP-28DA, and FP-30D packages. The only functional difference is the PROM programmability of HD4074394SV versus fixed firmware in HD404394FP - making HD4074394SV a drop-in replacement for development and qualification.
HD4074394SV 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:
HD4074394SV FAQ
1.How can I place an order for HD4074394SV through Aetrix?
Please submit a Request for Quotation (RFQ) for HD4074394SV 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 HD4074394SV reliable?
The price and inventory of HD4074394SV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HD4074394SV is usually 5 days.
3.What payment methods are accepted for HD4074394SV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HD4074394SV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HD4074394SV?
HD4074394SV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HD4074394SV 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 HD4074394SV?
For technical support, including HD4074394SV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HD4074394SV requirements.
6.How does Aetrix verify that HD4074394SV is sourced from the original manufacturer or authorized distributors?
All HD4074394SV 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 HD4074394SV meets industry standards.
7.What is the process for return or replacement of HD4074394SV?
All HD4074394SV units undergo pre-shipment inspection (PSI). If there is an issue with HD4074394SV, 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 HD4074394SV part is unused and in its original packaging.
Return procedure for HD4074394SV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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