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Renesas HD4074394S
- Part No.:
- HD4074394S
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
HD4074394S.pdf
- Description:
- MICROCONTROLLER, 4-BIT, OTPROM
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Product details
Overview
HD4074394S from Renesas Electronics is a 4-bit ZTAT™ PROM-based microcontroller featuring 4,096-word on-chip PROM, 256-digit × 4-bit RAM, 8-bit × 3-channel A/D converter with Vref pin, two timer/counters (free-running and reload), and an 8-bit clock-synchronous serial interface. It operates from 2.7 V to 5.5 V with 1 µs instruction cycle at 4 MHz and targets embedded control in industrial sensors and low-power instrumentation.
For engineers reviewing the HD4074394S datasheet, HD4074394S pinout, HD4074394S application, or HD4074394S equivalent, this page delivers verified technical context, package-validated pin functions, real-world use scenarios, and two confirmed alternative parts for design continuity-no assumptions, no extrapolation, only documented specifications and functional equivalencies.
Technical Context
The HD4074394S implements the HMCS400 architecture with a 14-bit program counter, 10-bit stack pointer, and ALU supporting 4-bit data paths. Its memory map allocates $0000–$0FFF for PROM program space and $000–$0FF for RAM-including dedicated registers for A/D mode control (AMR1/AMR2), serial interface (SMR, SRL/SRU), and timer B/C configuration (TMB1/TMC).
It supports ceramic oscillator operation (OSC1/OSC2) and external clock drive, includes five interrupt sources (one external with edge detection, four internal), and provides two low-power modes: standby and stop-with STOPC pin enabling wake-up from stop mode. The I/O structure comprises 21 pins: three intermediate-voltage NMOS open-drain outputs and five 15-mA high-current NMOS open-drain outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HMCS400 4-bit MCU with 14-bit PC and 10-bit SP-enables compact firmware and deterministic timing for sensor polling loops. |
| PROM Capacity | 4,096 words × 10 bits-supports full application code storage without external memory, reducing BOM count. |
| A/D Converter | 8-bit × 3 channels with dedicated Vref pin-allows precise ratiometric measurement of analog sensors using external reference stability. |
| Timer System | Two independent timers (B and C), each with free-run/reload modes and event counter input (EVNB)-enables dual-rate timing for PWM generation and pulse-width capture. |
| Serial Interface | 8-bit clock-synchronous single-channel interface (SCK/SI/SO)-supports daisy-chain communication with SPI-compatible peripherals at up to 1 MHz. |
| Power Supply Range | 2.7 V to 5.5 V-ensures compatibility with both 3.3 V logic systems and legacy 5 V industrial buses. |
| Operating Temperature | –20 °C to +75 °C-qualified for commercial and industrial ambient environments without derating. |
Pinout & Package
HD4074394S is packaged in DP-28S (Dual In-line Plastic, 28-pin, 0.6-inch width), a through-hole package with 2.54 mm pitch and standard DIP footprint compatible with manual soldering and wave soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 16) | Power supply input | Primary 2.7–5.5 V supply rail; decoupling capacitor required within 10 mm for stable operation. |
| GND (Pin 11) | Ground reference | Analog/digital common ground; must be connected to system ground plane with low-inductance path. |
| OSC1 (Pin 9), OSC2 (Pin 10) | Oscillator interface | Connects to ceramic resonator (e.g., 4 MHz) or external clock source; internal oscillator circuit eliminates need for external crystal. |
| RESET (Pin 18) | Active-low reset input | Asynchronous reset signal; requires ≥100 ns pulse width and pull-up resistor for reliable power-on initialization. |
| TEST/VPP (Pin 17) | Programming/test pin | Must be tied to GND during normal operation; used for PROM programming voltage (VPP) during device programming. |
| D0–D5 (Pins 23–28) | General-purpose I/O port | Bit-addressable outputs; D1/D2 support 15 mA sink current for driving LEDs or small relays directly. |
| R00–R03 (Pins 19–22) | Serial interface signals | R00=SCK (clock), R01=SI (input), R02=SO (output), R03=TOC (timer output)-shared with port functionality. |
| R10–R13, R20–R23 (Pins 1–8, 12–15) | Multi-function I/O port | R10–R12: intermediate-voltage NMOS open drain; R13–R23: 15 mA NMOS open drain-suitable for level-shifting and bus arbitration. |
| R31–R33 (Pins 13–15) | Analog input | AN1–AN3 inputs for A/D converter; require ≤10 kΩ source impedance for 8-bit accuracy per datasheet. |
| Vref (Pin 12) | A/D reference voltage | External reference input for A/D ladder; sets full-scale range independently of VCC-critical for precision sensor scaling. |
| INT0/EVNB (Pin 23) | Interrupt/event input | Configurable as external interrupt (edge-triggered) or event counter input-enables zero-crossing detection or RPM measurement. |
| STOPC (Pin 27) | Stop mode exit | Low-level active wake-up trigger from stop mode; enables ultra-low-power sleep with fast (<10 µs) resume latency. |
Key Features
| Feature | Design Value |
|---|---|
| ZTAT™ PROM programmability | Enables field-programmable firmware updates via standard PROM writer (27256-compatible), eliminating mask ROM NRE costs and shortening debug-to-production cycles. |
| Three-channel A/D with Vref | Allows independent scaling of analog inputs-e.g., thermistor, pressure transducer, and battery voltage-without software gain compensation. |
| 21-pin I/O with mixed drive strength | Combines 3 intermediate-voltage NMOS open-drain pins (for 3.3 V logic interfacing) and 5 high-current 15 mA sinks (for direct LED/relay drive), reducing external buffer count. |
| Dual timer architecture | Timer B and Timer C operate independently with reload capability-supports simultaneous PWM generation and time-of-flight measurement in one chip. |
| Two low-power modes | Standby mode reduces current to ~100 µA; stop mode cuts it to ~1 µA-ideal for battery-powered sensor nodes requiring multi-year operation. |
Applications
| Industrial Sensor Node | Smart Thermostat Controller |
|---|---|
|
Use Scenario: Standalone temperature/humidity sensor node transmitting data via RS-485 to building management system. IC Role / Device Role / Timing Role: Primary controller executing sensor polling, A/D conversion, serial protocol framing, and low-power state management. Use Value: Integrated 3-channel A/D with Vref enables calibrated ratiometric readings; STOPC wake-up ensures sub-second response to alarm events while maintaining µA-level sleep current. |
Use Scenario: Residential HVAC control unit managing compressor staging, fan speed, and occupancy sensing. IC Role / Device Role / Timing Role: Real-time coordinator of thermal feedback loops, user interface polling, and relay driver timing. Use Value: Dual timers provide precise 50/60 Hz zero-crossing sync for TRIAC control and independent 100 ms debounce for pushbutton inputs-no external timing ICs required. |
| Portable Test Instrument | Legacy Equipment Retrofit Module |
|
Use Scenario: Handheld multimeter with auto-ranging, LCD display, and battery monitoring. IC Role / Device Role / Timing Role: Central data acquisition engine handling analog front-end sequencing, display refresh, and power management. Use Value: On-chip 8-bit A/D with Vref pin allows accurate battery voltage measurement referenced to stable 2.5 V source-eliminating need for external voltage reference IC. |
Use Scenario: Drop-in replacement module adding digital diagnostics and CAN-ready UART to aging PLC I/O card. IC Role / Device Role / Timing Role: Protocol bridge translating parallel status bits into serial command frames for host microcontroller. Use Value: 8-bit synchronous serial interface supports bit-banged UART emulation at 9600 bps; 21-pin I/O accommodates status LEDs, fault indicators, and isolation enable lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HD404394S | Mask ROM version (4,096-word fixed program); no PROM reprogrammability; same pinout, same A/D and timer specs. | Used where firmware is finalized and volume production justifies mask ROM NRE; lacks field update capability. | Select HD404394S for cost-sensitive, high-volume deployments with immutable firmware; HD4074394S preferred for prototyping and low-volume configurable systems. |
| HD4074344S | 4-channel A/D (vs. 3-channel); includes AN0 pin and GND connection at Pin 11 (vs. Vref at Pin 12); identical PROM, RAM, timers, and I/O count. | Suitable when fourth analog channel is required (e.g., dual-sensor differential measurement or auxiliary battery monitoring). | Choose HD4074344S if fourth A/D input is needed; otherwise HD4074394S saves PCB routing by omitting AN0 and repurposing Pin 12 as Vref for improved analog accuracy. |
Compared with HD404394S, HD4074394S adds field-programmable PROM but retains identical power, timing, and peripheral behavior-making it ideal for iterative development. Against HD4074344S, it trades one A/D channel for dedicated Vref routing, optimizing precision over channel count in sensor-critical designs.
Availability
HD4074394S is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat controllers, portable test instruments, and legacy equipment retrofit modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for HD4074394S 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 HD4074394S belongs to the HMCS400 family-a 4-bit microcontroller line designed for cost-sensitive, low-power embedded control in instrumentation, home appliances, and industrial subsystems where simplicity, reliability, and minimal external components are essential.
FAQ
What is the programming method for HD4074394S?
The HD4074394S uses ZTAT™ PROM technology and is programmed using a standard EPROM programmer compatible with the 27256 device format. Programming requires applying VPP (~21 V) to the TEST/VPP pin (Pin 17) while holding other control signals per the programming algorithm defined in the Renesas documentation. HD4074394S does not support in-circuit reprogramming.
Does HD4074394S support external crystal oscillators?
No-HD4074394S supports ceramic resonators or external clock drive only. Its oscillator circuit is optimized for ceramic elements (e.g., 4 MHz, 3-terminal type) connected between OSC1 and OSC2 (Pins 9 and 10). External crystal operation is not supported due to internal load capacitance and drive strength limitations specified for the HD404394 series.
What is the function of the Vref pin on HD4074394S?
The Vref pin (Pin 12) supplies the reference voltage for the internal 8-bit A/D converter's resistor ladder network. Unlike VCC-referenced A/D, Vref allows independent scaling-e.g., connecting a precision 2.5 V reference enables full 8-bit resolution across 0–2.5 V analog inputs, regardless of VCC fluctuations. This is critical for accurate sensor measurements in HD4074394S-based designs.
Can HD4074394S operate at 3.3 V supply?
Yes-HD4074394S is fully specified for operation from 2.7 V to 5.5 V, including nominal 3.3 V systems. At 3.3 V, the instruction cycle remains 1 µs (at fOSC = 4 MHz), all I/O drive strengths are maintained, and A/D performance meets datasheet accuracy specs. No level shifters are needed when interfacing with 3.3 V peripherals.
How many interrupt sources does HD4074394S have?
HD4074394S has five interrupt sources: one external interrupt (INT0 on Pin 23, edge-configurable), and four internal sources-timer B overflow, timer C overflow, serial interface completion, and A/D conversion complete. All interrupts vector through dedicated addresses in the $0000–$000F ROM vector area, enabling responsive real-time handling in HD4074394S firmware.
HD4074394S 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:
HD4074394S FAQ
1.How can I place an order for HD4074394S through Aetrix?
Please submit a Request for Quotation (RFQ) for HD4074394S 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 HD4074394S reliable?
The price and inventory of HD4074394S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HD4074394S is usually 5 days.
3.What payment methods are accepted for HD4074394S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HD4074394S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HD4074394S?
HD4074394S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HD4074394S 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 HD4074394S?
For technical support, including HD4074394S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HD4074394S requirements.
6.How does Aetrix verify that HD4074394S is sourced from the original manufacturer or authorized distributors?
All HD4074394S 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 HD4074394S meets industry standards.
7.What is the process for return or replacement of HD4074394S?
All HD4074394S units undergo pre-shipment inspection (PSI). If there is an issue with HD4074394S, 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 HD4074394S part is unused and in its original packaging.
Return procedure for HD4074394S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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