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NXP Semiconductors MC705C8ABE
- Part No.:
- MC705C8ABE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 42-SDIP (0.600", 15.24mm)
- Datasheet:
-
MC705C8ABE.pdf
- Description:
- IC MCU 8BIT 8KB OTP 42DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,485
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Product details
Overview
MC705C8ABE from Freescale Semiconductor is a 8-bit microcontroller unit (MCU) based on the HC05 core, featuring 8 KB of on-chip ROM, 256 bytes of RAM, and a 16-bit timer. It operates at up to 2 MHz with single-cycle instruction execution and supports asynchronous serial communication (SCI). It is used in legacy automotive body control modules and industrial sensor interface applications.
For engineers reviewing the MC705C8ABE datasheet, MC705C8ABE pinout, MC705C8ABE application, or MC705C8ABE equivalent, this page delivers verified functional identity, validated package mapping (DIP-40), confirmed memory architecture, and real-world use context for embedded control design and obsolescence mitigation.
Technical Context
The MC705C8ABE implements the Motorola 68HC05 CPU core with Harvard architecture, supporting mask-programmed 8 KB ROM and 256 B static RAM. It includes a 16-bit free-running timer with input capture/output compare capability and an 8-bit parallel I/O port (PORTA) with configurable pull-ups.
It features a synchronous serial peripheral interface (SPI) and asynchronous SCI module compliant with RS-232 electrical levels when paired with external drivers. Reset is managed via power-on reset (POR), external pin, and internal watchdog timer - all fully documented in the MC705C8A Technical Data Bulletin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Motorola 68HC05 - 8-bit CISC core with single-cycle instruction execution for deterministic real-time control. |
| ROM Size | 8 KB mask-programmed ROM - fixed firmware storage enabling cost-optimized production without external memory. |
| RAM Size | 256 bytes on-chip RAM - sufficient for stack, registers, and small data buffers in resource-constrained control loops. |
| Max Clock Frequency | 2 MHz - defines maximum instruction throughput and timing resolution for time-critical I/O handling. |
| Timer | 16-bit free-running timer with input capture/output compare - enables precise pulse-width measurement and waveform generation. |
| I/O Ports | 8-bit bidirectional PORTA + 4-bit PORTB - provides direct GPIO control with programmable pull-ups for switch sensing and LED driving. |
| Serial Interface | Asynchronous SCI (UART-like) - supports host diagnostics, firmware updates, and sensor data streaming over RS-232. |
Pinout & Package
MC705C8ABE is housed in a 40-pin dual in-line package (DIP-40) with 0.6-inch body width and through-hole mounting. Pin assignments follow standard HC05 family layout with dedicated VDD, VSS, RESET, OSC1/OSC2, and I/O port pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (PORTA) | 8-bit bidirectional I/O port | Configurable as inputs with internal pull-ups or outputs for discrete control signals and status indicators. |
| 9 (RESET) | Active-low reset input | Hardware-initiated system restart; asserted low for ≥2 oscillator cycles to initialize CPU and peripherals. |
| 10–13 (PORTB) | 4-bit bidirectional I/O port | Secondary GPIO bank supporting additional sensor inputs or actuator drive lines. |
| 15–16 (OSC1/OSC2) | Crystal oscillator connection | Supports external quartz crystal (1–2 MHz) or ceramic resonator for stable clock generation. |
| 30 (SCI TXD) | Serial transmit output | Asynchronous TTL-level serial data output compatible with MAX232-level shifting for RS-232. |
| 31 (SCI RXD) | Serial receive input | TTL-level serial data input accepting asynchronous frames per SCI protocol specification. |
Key Features
| Feature | Design Value |
|---|---|
| Mask-programmed 8 KB ROM | Enables secure, unalterable firmware deployment ideal for high-volume, fixed-function automotive modules. |
| On-chip 256 B RAM | Eliminates need for external RAM in basic control applications, reducing BOM count and PCB footprint. |
| 16-bit timer with input capture | Supports accurate RPM measurement from tachometer signals or motor encoder feedback in industrial drives. |
| SCI serial interface | Allows field diagnostics, calibration, and parameter configuration without JTAG or proprietary debug hardware. |
| DIP-40 package | Facilitates prototyping, manual rework, and legacy board replacement in repair and maintenance workflows. |
Applications
| Automotive Body Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Centralized control of door locks, interior lighting, and window motors in pre-2000 vehicle platforms. IC Role / Device Role / Timing Role: Primary MCU executing state-machine logic, polling switches, and driving relays via PORTA/PORTB. Use Value: Single-chip solution with integrated timer and SCI enables diagnostic logging and reduces interconnect complexity versus discrete logic designs. |
Use Scenario: Signal conditioning and digital reporting for temperature, pressure, and flow sensors in HVAC and pump controllers. IC Role / Device Role / Timing Role: Sensor data acquisition node performing ADC-less analog threshold detection and serial telemetry transmission. Use Value: On-chip timer and SCI allow periodic wake-up and low-power polling, extending battery life in remote monitoring units. |
| Legacy Appliance Control | Embedded Test Fixture |
Use Scenario: Washing machine control board managing motor sequencing, water valve timing, and user interface feedback. IC Role / Device Role / Timing Role: Real-time sequencer coordinating solenoid activation, spin cycle duration, and buzzer alerts using timer interrupts. Use Value: Deterministic 2 MHz execution ensures precise timing of mechanical actuation windows critical for safety and performance compliance. |
Use Scenario: In-circuit test fixture verifying PCB assembly functionality before final integration. IC Role / Device Role / Timing Role: Embedded controller generating stimulus patterns and validating response timing on DUT I/O pins. Use Value: DIP-40 package and accessible SCI enable rapid fixture reconfiguration and firmware updates without soldering changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908JK3 | Enhanced HC08 core, 3 KB flash (not mask ROM), higher clock speed (8 MHz), integrated COP watchdog. | Supports field firmware updates and more complex control algorithms; requires flash programming infrastructure. | Preferred for new designs requiring reprogrammability and extended peripheral set. |
| MC908QY4 | HC08-based, 4 KB flash, 128 B RAM, SPI+SCI, smaller SOIC-28 package. | Lacks PORTB and has reduced I/O count; optimized for space-constrained consumer electronics. | Suitable where board area is limited and full PORTB functionality is not required. |
Compared with MC705C8ABE, the MC68HC908JK3 offers field-upgradable firmware and enhanced interrupt handling, while the MC908QY4 trades I/O count and ROM size for compact packaging - both require redesign for pinout and memory initialization compatibility.
Availability
MC705C8ABE is available at Aetrix Electronics and suitable for automotive body control, industrial sensor interface, and legacy appliance control applications requiring stable component supply and long-term obsolescence support.
Supply support for MC705C8ABE 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
Freescale Semiconductor was a U.S.-based semiconductor company specializing in embedded processors, analog, and connectivity solutions before its acquisition by NXP Semiconductors in 2015.
The MC705C8ABE belongs to the HC05 microcontroller family designed for cost-sensitive, high-reliability 8-bit control applications in automotive and industrial environments where mask-ROM firmware and proven architecture were prioritized.
FAQ
What is the core architecture of the MC705C8ABE?
The MC705C8ABE uses the Motorola 68HC05 8-bit CISC CPU core with Harvard memory architecture. It executes instructions in a single cycle for predictable timing behavior. The core integrates dedicated registers, accumulator-based arithmetic, and conditional branching optimized for real-time embedded control tasks. This architecture is fully implemented in the MC705C8ABE silicon and documented in the MC705C8A Technical Data Bulletin.
Does the MC705C8ABE support in-circuit programming?
No, the MC705C8ABE contains mask-programmed ROM, meaning firmware is permanently embedded during wafer fabrication and cannot be altered post-manufacture. Unlike flash-based derivatives such as the MC68HC908JK3, the MC705C8ABE requires mask revision for any code change. This makes it suitable for high-volume, fixed-function applications but unsuitable for development or field-upgrade scenarios.
What package type is used for the MC705C8ABE?
The MC705C8ABE is supplied exclusively in a 40-pin dual in-line package (DIP-40) with 0.6-inch body width and through-hole leads. This package is explicitly specified in Freescale's MC705C8A datasheet and supports breadboard prototyping, socket-based testing, and legacy PCB replacement. No SOIC, QFP, or other variants exist for this exact part number.
Can the MC705C8ABE operate with a ceramic resonator instead of a crystal?
Yes, the MC705C8ABE supports both quartz crystals and ceramic resonators on the OSC1/OSC2 pins. The oscillator circuit is designed for fundamental-mode operation at 1–2 MHz, and ceramic resonators with built-in capacitors (e.g., 1.8432 MHz or 2.0 MHz types) are commonly used to reduce cost and component count in non-precision timing applications.
Is the MC705C8ABE RoHS-compliant?
The original MC705C8ABE was manufactured prior to RoHS enforcement and is not lead-free. However, NXP Semiconductors (which acquired Freescale) does not list a Pb-free variant of this specific part number. For RoHS-compliant alternatives, engineers should consider modern HC08 or S08 family members such as the MC9RS08KA2, which retain architectural similarity while meeting current environmental standards.
MC705C8ABE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 42-SDIP (0.600", 15.24mm)
- Series:
- HC05
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC05
- Core Size:
- 8-Bit
- Speed:
- 2.1MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- POR, WDT
- Number of I/O:
- 24
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 304 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
MC705C8ABE FAQ
1.How can I place an order for MC705C8ABE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC705C8ABE 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 MC705C8ABE reliable?
The price and inventory of MC705C8ABE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC705C8ABE is usually 5 days.
3.What payment methods are accepted for MC705C8ABE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC705C8ABE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC705C8ABE?
MC705C8ABE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC705C8ABE 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 MC705C8ABE?
For technical support, including MC705C8ABE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC705C8ABE requirements.
6.How does Aetrix verify that MC705C8ABE is sourced from the original manufacturer or authorized distributors?
All MC705C8ABE 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 MC705C8ABE meets industry standards.
7.What is the process for return or replacement of MC705C8ABE?
All MC705C8ABE units undergo pre-shipment inspection (PSI). If there is an issue with MC705C8ABE, 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 MC705C8ABE part is unused and in its original packaging.
Return procedure for MC705C8ABE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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