My Inquiry
My Account
NXP Semiconductors MC705C8ACPE
- Part No.:
- MC705C8ACPE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
MC705C8ACPE.pdf
- Description:
- IC MCU 8BIT 8KB OTP 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,774
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC705C8ACPE from Freescale Semiconductor is a 8-bit microcontroller unit (MCU) based on the HC05 core, featuring 8 KB of on-chip ROM, 192 bytes of RAM, and a 16-bit timer module. It operates at up to 2 MHz with single-supply 5 V operation and supports asynchronous serial communication (SCI). It is used in legacy industrial control modules requiring deterministic real-time response and minimal external components.
For engineers reviewing the MC705C8ACPE datasheet, MC705C8ACPE pinout, MC705C8ACPE application, or MC705C8ACPE equivalent, this page provides verified technical context, package mapping, functional alternatives, and supply-chain-ready availability details for embedded control design continuity.
Technical Context
The MC705C8ACPE implements the Motorola HC05 CPU core with Harvard architecture, supporting mask-programmed 8 KB ROM and 192 B RAM. It includes a 16-bit free-running timer with input capture/output compare capability and an 8-bit analog-to-digital converter (ADC) with 8-channel multiplexed inputs.
It features a synchronous serial interface (SSI), asynchronous serial communications interface (SCI), and 28 general-purpose I/O pins mapped across PORTA, PORTB, and PORTC. Reset and interrupt handling follow HC05-standard vectoring with power-on reset and external interrupt support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Motorola HC05 8-bit CISC core with 2 MHz max bus frequency - defines instruction cycle timing and peripheral synchronization. |
| ROM Size | 8 KB mask-programmed ROM - fixed firmware storage; no field reprogrammability, suited for high-volume, unchanging control logic. |
| RAM Size | 192 bytes on-chip RAM - sufficient for stack, registers, and small data buffers in resource-constrained real-time tasks. |
| ADC Resolution | 8-bit successive-approximation ADC with 8 input channels - enables basic sensor monitoring (e.g., temperature, voltage) without external converters. |
| Timer Module | 16-bit free-running timer with input capture/output compare - supports precise event timing, pulse-width measurement, and waveform generation. |
| I/O Pins | 28 programmable I/O pins across three ports - provides direct interfacing to switches, LEDs, relays, and simple peripherals. |
Pinout & Package
MC705C8ACPE is housed in a 40-pin Dual In-line Package (DIP) with 0.6-inch body width and through-hole mounting. Pin assignments conform to standard HC05 family layout with dedicated reset, clock input (EXTAL/XTAL), and bidirectional port pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8, 11–18, 21–28, 31–38 | PORTA / PORTB / PORTC I/O | 28 general-purpose digital I/O lines; configurable as input with pull-up or output with TTL-compatible drive strength. |
| 9 | RESET | Active-low asynchronous reset input; initiates hardware reset sequence and clears CPU registers and peripheral states. |
| 10 | VSS | Ground reference for digital and analog circuitry; must be connected to system common ground plane. |
| 19 | VDD | +5 V DC power supply input; requires local 0.1 µF ceramic decoupling capacitor near pin. |
| 20 | EXTAL | External clock input terminal; accepts crystal or external oscillator signal for system timing reference. |
| 29 | SCI TXD | Asynchronous serial transmit data output; drives RS-232 level-shifted signals via external driver. |
| 30 | SCI RXD | Asynchronous serial receive data input; accepts TTL-level serial data from external UART or transceiver. |
| 39 | AD0–AD7 | 8-channel analog multiplexer inputs for ADC; share pins with PORTA bits - time-multiplexed sampling required. |
| 40 | IRQ | Maskable interrupt request input; triggers software interrupt service routine on falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 8 KB ROM | Eliminates need for external program memory; reduces BOM count and PCB footprint in cost-sensitive control applications. |
| Integrated 8-bit ADC | Enables direct analog sensor interfacing without external ADC ICs - simplifies signal chain for temperature, pressure, or voltage monitoring. |
| 16-bit timer with capture/compare | Supports accurate time-stamping of external events and generation of precise PWM waveforms for motor or LED control. |
| SCI serial interface | Provides standardized full-duplex asynchronous communication for host diagnostics, configuration, or telemetry reporting. |
| Single 5 V supply operation | Removes requirement for dual-rail or regulated auxiliary supplies - simplifies power design in industrial and appliance systems. |
Applications
| Industrial Motor Control | Legacy Appliance Controller |
|---|---|
|
Use Scenario: Standalone speed and direction control of small AC induction motors in conveyor systems using discrete I/O and timer-generated PWM. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop logic, reading encoder feedback via input capture, and driving triac gate signals via PORTB outputs. Use Value: On-chip 16-bit timer enables sub-millisecond timing resolution for commutation timing; 8 KB ROM stores calibrated motor profiles without external memory. |
Use Scenario: Embedded controller in washing machine main board managing water valve actuation, drum rotation sequencing, and user interface polling. IC Role / Device Role / Timing Role: Central timing and I/O coordinator - uses SCI for front-panel display updates and ADC for thermistor-based temperature sensing. Use Value: Integrated 8-bit ADC reads NTC thermistors directly; 28 I/O pins drive solenoids, motor drivers, and LED indicators without glue logic. |
| Building Automation Sensor Node | Power Supply Monitor Module |
|
Use Scenario: Wall-mounted HVAC zone controller acquiring ambient temperature/humidity and modulating damper position via stepper motor interface. IC Role / Device Role / Timing Role: Sensor fusion node - samples analog sensors via ADC, processes thresholds, and communicates status over SCI to central controller. Use Value: Single 5 V supply simplifies integration into low-power building wiring; mask ROM ensures firmware integrity across decades of deployment. |
Use Scenario: Secondary-side monitor in telecom power shelf detecting overvoltage, undervoltage, and fan failure conditions before initiating shutdown. IC Role / Device Role / Timing Role: Fault-safety supervisor - continuously polls analog rails and digital status lines, asserts hardware reset if thresholds breached. Use Value: Hardware reset pin (pin 9) provides fail-safe recovery path independent of software state; IRQ pin enables immediate fault logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC11E9CP | Upgraded HC11 core, 512 B RAM, 512 B EEPROM, enhanced SCI and SPI - higher code density and nonvolatile data storage. | Supports field firmware updates and parameter retention across power cycles; suitable where calibration data persistence is required. | Select when EEPROM-backed configuration storage and expanded peripheral set justify migration effort and cost increase. |
| MC9RS08KA2CSC | Freescale RS08 core, 2 KB flash, 128 B RAM, integrated LVD and BOR - modern low-power architecture with in-circuit programming. | Enables energy-efficient operation and simplified production programming; lacks mask ROM security but adds debug interface. | Prefer for new designs needing flash reprogrammability, lower active current, and toolchain support - not drop-in compatible. |
Compared with MC705C8ACPE, MC68HC11E9CP offers greater memory flexibility and peripheral richness for evolving control logic, while MC9RS08KA2CSC delivers modern flash-based development agility and power efficiency - both require PCB and firmware redesign due to architectural and pinout differences.
Availability
MC705C8ACPE is available at Aetrix Electronics and suitable for industrial motor control, legacy appliance repair, and building automation sensor node applications requiring stable component supply and long-term obsolescence management.
Supply support for MC705C8ACPE 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 leading designer of embedded processors, analog, and mixed-signal semiconductors, later acquired by NXP Semiconductors in 2015.
The MC705C8ACPE belongs to the HC05 microcontroller family, designed for cost-sensitive, high-reliability 8-bit control applications in industrial and consumer equipment where mask-programmed firmware and minimal external components are critical.
FAQ
What is the maximum operating frequency of the MC705C8ACPE?
The MC705C8ACPE operates with a maximum bus frequency of 2 MHz, derived from its internal clock generator synchronized to an external crystal or oscillator connected to EXTAL/XTAL pins. This frequency determines instruction execution speed and peripheral timing resolution. The MC705C8ACPE does not include an internal PLL or frequency multiplier, so system timing is directly tied to the external clock source. Designers must ensure clock stability and jitter compliance per the MC705C8ACPE datasheet specifications to maintain reliable operation.
Does the MC705C8ACPE support in-system programming?
No, the MC705C8ACPE does not support in-system programming. Its 8 KB of program memory is mask-programmed during fabrication and cannot be modified after packaging. This makes the MC705C8ACPE suitable for high-volume, fixed-function applications where firmware is finalized prior to production. For field-upgradable designs, alternative devices such as the MC68HC11E9CP or MC9RS08KA2CSC with EEPROM or flash memory should be considered instead of the MC705C8ACPE.
What package type is used for the MC705C8ACPE?
The MC705C8ACPE is packaged in a 40-pin plastic Dual In-line Package (PDIP) with 0.6-inch body width and through-hole mounting. This package supports manual soldering and socket-based prototyping, making it suitable for legacy repair, educational labs, and low-volume industrial control boards. The pinout matches standard HC05 family layouts, enabling compatibility with existing PCB footprints designed for similar HC05 derivatives - provided mechanical and thermal constraints are verified for the MC705C8ACPE specifically.
Can the MC705C8ACPE's ADC be used simultaneously with timer functions?
Yes, the MC705C8ACPE's 8-bit ADC and 16-bit timer operate independently and can be used concurrently. The ADC uses a separate conversion clock derived from the system bus clock, while the timer runs from the same source but maintains autonomous counting and event capture logic. Software must manage shared resources such as CPU cycles and interrupt priorities, but hardware-level interference between ADC sampling and timer operations does not occur. This concurrency allows the MC705C8ACPE to perform real-time sensor acquisition and precise timing tasks - for example, measuring motor current while generating commutation pulses.
Is the MC705C8ACPE RoHS-compliant?
The MC705C8ACPE was originally manufactured prior to widespread RoHS enforcement and is not inherently RoHS-compliant in its standard form. Freescale did not release a Pb-free variant of the MC705C8ACPE under this part number. For RoHS-compliant alternatives, designers should evaluate functionally similar modern devices such as the S08AWxx series or consult NXP's legacy product support documentation for any officially sanctioned green variants. Aetrix Electronics sources only traceable, documented inventory - confirm compliance status per batch documentation when ordering the MC705C8ACPE.
MC705C8ACPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 40-DIP (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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
MC705C8ACPE FAQ
1.How can I place an order for MC705C8ACPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC705C8ACPE 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 MC705C8ACPE reliable?
The price and inventory of MC705C8ACPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC705C8ACPE is usually 5 days.
3.What payment methods are accepted for MC705C8ACPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC705C8ACPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC705C8ACPE?
MC705C8ACPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC705C8ACPE 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 MC705C8ACPE?
For technical support, including MC705C8ACPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC705C8ACPE requirements.
6.How does Aetrix verify that MC705C8ACPE is sourced from the original manufacturer or authorized distributors?
All MC705C8ACPE 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 MC705C8ACPE meets industry standards.
7.What is the process for return or replacement of MC705C8ACPE?
All MC705C8ACPE units undergo pre-shipment inspection (PSI). If there is an issue with MC705C8ACPE, 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 MC705C8ACPE part is unused and in its original packaging.
Return procedure for MC705C8ACPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC705C8ACPE Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
