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Renesas HD4074849H
- Part No.:
- HD4074849H
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
HD4074849H.pdf
- Description:
- MICROCONTROLLER, 4-BIT, OTPROM
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
HD4074849H from Renesas Electronics is a 4-bit single-chip microcomputer with 16,384-word on-chip PROM, 1,184 × 4-bit RAM, 8-channel 8-bit A/D converter, LCD controller/driver (32 segments × 4 commons), and four low-power dissipation modes. It operates from 2.7 V to 5.5 V and targets embedded instrumentation with integrated display and sensing.
For engineers reviewing the HD4074849H datasheet, HD4074849H pinout, HD4074849H application, or HD4074849H equivalent, this device supports MCU/PROM mode for rapid prototyping and mass production transition, features 35 I/O pins (including nine 15 mA high-current outputs), and integrates serial interface, timer/counters, and input capture - critical for portable medical monitors and industrial panel meters.
Technical Context
The HD4074849H implements an HMCS400-series architecture with a 14-bit program counter, ALU, and dedicated system control circuitry. It supports two operating modes: standard MCU mode (not applicable) and MCU/PROM mode - exclusive to HD4074849 variants - enabling in-system programming via ZTAT™ PROM write compatibility with 27256 specifications.
Its memory subsystem includes a 16,384-word × 10-bit PROM program area ($0000–$3FFF), 1,184 × 4-bit RAM mapped across data, stack, LCD, and register areas, and hardware-managed bank switching (V register) for dual-bank data access. The A/D converter operates at 2.7–5.5 V with AVCC/AVSS isolation, and the LCD driver supports software-controlled V1/V2/V3 voltage division.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PROM size | 16,384 words × 10 bits - provides full firmware storage without external memory; compatible with standard 27256 PROM programmers. |
| RAM capacity | 1,184 × 4-bit - supports 32-digit LCD display buffer, interrupt stacks, and dual-bank data handling up to 464 digits per bank. |
| A/D converter | 8 channels × 8 bits, 2.7–5.5 V operation - enables direct sensor interfacing (e.g., thermistors, potentiometers) without external signal conditioning. |
| LCD driver | 32 segments × 4 commons - drives multiplexed character or custom segment displays common in handheld test equipment and appliance UIs. |
| Power supply range | VCC = 2.7 V to 5.5 V - ensures compatibility with single-cell Li-ion (3.0–3.7 V) and 5 V logic systems. |
| Instruction cycle time | 0.89 µs at fOSC = 4.5 MHz - delivers real-time response for input capture, PWM generation, and serial communication at typical embedded clock speeds. |
| Low-power modes | Standby, Stop, Watch, Subactive - Subactive mode extends operation down to 2.2 V, enabling battery-backed operation during sleep states. |
Pinout & Package
HD4074849H is housed in an 80-pin plastic QFP (FP-80A) package with 0.65 mm lead pitch, compliant with JEDEC MS-026. Pin layout supports mixed-signal routing with dedicated AVCC/AVSS, isolated analog inputs (AN0–AN7), and segmented LCD power (V1–V3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OSC1 / OSC2 | Main oscillator interface | Supports ceramic resonator or external clock source; enables flexible timing design without crystal load capacitance tuning. |
| X1 / X2 | 32.768 kHz subclock input | Dedicated low-frequency crystal interface for RTC or low-power wake-up; X2 left open if unused. |
| D0–D8 | High-current I/O ports | Each supplies up to 15 mA - directly drives LEDs, small relays, or LCD segment backplanes without external drivers. |
| AN0–AN7 | Analog inputs | Eight single-ended channels referenced to AVCC/AVSS - requires physical proximity of AVCC to VCC and AVSS to GND for noise immunity. |
| V1–V3 | LCD voltage dividers | Software-controllable bias pins - configure LCD contrast and drive strength dynamically based on temperature or battery voltage. |
| COM1–COM4 | LCD common outputs | Four independent common lines - support static or 1:4 multiplexed LCDs used in digital multimeters and HVAC controllers. |
| SEG13–SEG44 | LCD segment outputs | 32 dedicated segment drivers - map directly to LCD glass layout; driven automatically from $05C–$07B RAM area. |
| STOPC | Stop mode exit trigger | External asynchronous input to resume execution from Stop mode - enables ultra-low-power wait-for-event operation. |
Key Features
| Feature | Design Value |
|---|---|
| ZTAT™ PROM programming | Enables field-programmable firmware using standard 27256 PROM writers - eliminates mask ROM NRE costs and accelerates design iteration. |
| MCU/PROM operating mode | Exclusive to HD4074849 family - allows seamless transition from debug (PROM) to production (mask ROM) without hardware change. |
| Integrated LCD + A/D + serial | Reduces BOM count by consolidating display, sensing, and communication into one chip - ideal for space-constrained portable instruments. |
| Four low-power dissipation modes | Subactive mode sustains operation down to 2.2 V - extends battery life in handheld devices while retaining RAM and peripheral state. |
| 35 configurable I/O pins | Nine high-current outputs (15 mA), eight LCD-multiplexed, four analog-multiplexed - maximizes pin utility in cost-sensitive designs. |
Applications
| Portable Medical Monitor | Digital Multimeter (DMM) |
|---|---|
Use Scenario: Battery-powered handheld device measuring temperature, pulse rate, and oxygen saturation with alphanumeric LCD display. IC Role / Device Role / Timing Role: HD4074849H serves as main controller, performing A/D conversion of analog sensor signals, driving 32-segment LCD, and managing low-power sleep/wake cycles. Use Value: Integrated 8-channel A/D and LCD driver eliminate external ICs; Subactive mode extends AA battery life beyond 100 hours during standby. |
Use Scenario: Handheld test instrument acquiring voltage, current, and resistance readings with 4-digit LCD output and auto-ranging. IC Role / Device Role / Timing Role: HD4074849H executes measurement algorithms, controls ADC sampling timing, updates LCD segments, and manages button input via interrupt-capable I/O pins. Use Value: Nine 15 mA I/O pins directly drive LCD backplanes and indicator LEDs; input capture circuit synchronizes external trigger pulses for frequency measurement. |
| Industrial Panel Meter | Appliance Control Module |
Use Scenario: DIN-rail mounted meter displaying process variables (pressure, flow) with local keypad and LED status indicators. IC Role / Device Role / Timing Role: HD4074849H acts as system-on-chip controller, reading analog transducer outputs, updating 32-segment LCD, and generating PWM for LED dimming. Use Value: Four timer outputs include two PWM channels - enable precise LED brightness control without external timers; STOPC pin allows wake-on-button-press. |
Use Scenario: Microwave oven or washing machine control board managing user interface, motor timing, and temperature feedback. IC Role / Device Role / Timing Role: HD4074849H coordinates cooking cycle timing, reads thermistor inputs, drives segmented display, and triggers relay drivers via high-current D-pins. Use Value: 16-level subroutine stack supports nested interrupt handling for safety-critical timeout monitoring; Watch mode maintains RTC accuracy during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HD404849H | 16-kword mask ROM (not programmable); same pinout, package, and peripheral set. | Suitable for high-volume production where firmware is finalized and unchanging. | Select HD404849H when mask ROM cost advantage outweighs flexibility; HD4074849H preferred for development and low-to-mid volume. |
| HD4048412H | 12-kword mask ROM, identical architecture and peripherals except reduced program memory. | Fits simpler firmware with <12 KB code; lower cost but no PROM option. | Choose HD4048412H only if application fits within 12 KB and does not require field programming capability. |
Compared with HD404849H and HD4048412H, the HD4074849H uniquely supports ZTAT™ PROM programming and MCU/PROM mode - making it the sole choice for iterative firmware development and small-batch manufacturing without mask ROM commitment.
Availability
HD4074849H is available at Aetrix Electronics and suitable for portable medical monitors, digital multimeters, industrial panel meters, and appliance control modules requiring stable component supply and long-term obsolescence management.
Supply support for HD4074849H 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 HD4074849H belongs to the HMCS400-series 4-bit microcomputer family, designed specifically for cost-sensitive, low-power embedded applications integrating LCD, A/D, and serial interfaces - targeting instrumentation, consumer electronics, and industrial controls.
FAQ
What is the programming method for HD4074849H PROM memory?
The HD4074849H PROM is programmed using standard 27256-compatible PROM writers. Programming specifications match those of the 27256 EPROM, including VPP voltage, timing, and address/data sequencing. HD4074849H must be operated in MCU/PROM mode during programming, and the TEST pin is reserved for factory use only - do not connect externally. Always verify programming with checksum or read-back validation before system integration.
Does HD4074849H support both crystal and ceramic resonator for the main oscillator?
Yes, HD4074849H supports ceramic resonators, crystal oscillators, or external clock sources on the OSC1/OSC2 pins. The internal oscillator circuit is designed for direct connection to a 3-terminal ceramic resonator (e.g., 4.5 MHz) without external capacitors. For crystals, appropriate load capacitors must be added per manufacturer recommendations. HD4074849H does not require external startup components for ceramic-based timing.
How does the LCD driver in HD4074849H handle contrast control?
The HD4074849H provides three software-controllable LCD bias pins (V1, V2, V3) that connect to internal resistor ladders. By setting these pins to different logic levels, designers select LCD voltage division ratios to adjust contrast dynamically - critical for maintaining readability across temperature and battery voltage ranges. The HD4074849H does not include automatic temperature compensation; contrast adjustment must be implemented in firmware using ambient sensor input.
What are the key differences between HD4074849H and HD404849H?
The HD4074849H uses 16-kword on-chip PROM and operates exclusively in MCU/PROM mode, while the HD404849H uses 16-kword mask ROM and runs in standard MCU mode. Both share identical pinout, package (FP-80A), peripherals, and electrical specs. HD4074849H enables field firmware updates and rapid prototyping; HD404849H offers lower unit cost for fixed-function, high-volume deployments. Neither is pin-compatible with non-HD4048xx variants.
Can HD4074849H operate from a single 3.3 V supply?
Yes, HD4074849H operates across 2.7 V to 5.5 V, fully supporting 3.3 V nominal supply. At 3.3 V, all peripherals - including the 8-bit A/D converter, LCD driver, and serial interface - function within specification. The A/D reference remains tied to AVCC, so AVCC must also be at 3.3 V and decoupled near the AVCC pin. Subactive mode extends functionality down to 2.2 V, allowing graceful degradation during brown-out conditions.
HD4074849H 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:
HD4074849H FAQ
1.How can I place an order for HD4074849H through Aetrix?
Please submit a Request for Quotation (RFQ) for HD4074849H 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 HD4074849H reliable?
The price and inventory of HD4074849H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HD4074849H is usually 5 days.
3.What payment methods are accepted for HD4074849H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HD4074849H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HD4074849H?
HD4074849H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HD4074849H 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 HD4074849H?
For technical support, including HD4074849H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HD4074849H requirements.
6.How does Aetrix verify that HD4074849H is sourced from the original manufacturer or authorized distributors?
All HD4074849H 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 HD4074849H meets industry standards.
7.What is the process for return or replacement of HD4074849H?
All HD4074849H units undergo pre-shipment inspection (PSI). If there is an issue with HD4074849H, 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 HD4074849H part is unused and in its original packaging.
Return procedure for HD4074849H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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