NXP Semiconductors MC68HC908QY4VDTE

Overview

MC68HC908QY4VDTE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB on-chip FLASH, 192 B RAM, and integrated 8-channel 8-bit ADC. It operates at up to 8 MHz bus frequency using an internal trimmed RC oscillator and supports low-power wait/stop modes. Used in cost-sensitive embedded control applications such as appliance motor interfaces and sensor signal conditioning.

For engineers reviewing the MC68HC908QY4VDTE datasheet, MC68HC908QY4VDTE pinout, MC68HC908QY4VDTE application, or MC68HC908QY4VDTE equivalent, key selection criteria include its 16-pin SOIC package, internal oscillator accuracy (±2% over temperature), COP watchdog timeout range (1.7–13.5 ms), KBI keyboard interrupt capability, and LVI brown-out detection at 2.5 V nominal.

Technical Context

The MC68HC908QY4VDTE implements the M68HC08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing. Its memory map includes 4 KB FLASH (with block protection), 192 B RAM, and 32 B EEPROM-equivalent data storage via FLASH emulation.

Peripherals include a 16-bit Timer Interface Module (TIM) with input capture/output compare, Keyboard Interrupt Module (KBI) supporting up to 8 keys, Auto Wakeup Module (AWU) with programmable sleep intervals, and Low-Voltage Inhibit (LVI) with selectable trip points (2.5 V or 3.0 V). The internal oscillator is factory-trimmed for ±2% accuracy across –40°C to +85°C.

Key Specifications

Pinout & Package

MC68HC908QY4VDTE is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, compliant with JEDEC MS-012AC. Pin assignments are defined per Figure 1-2 and Table 1-2 of Rev. 6 datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC9RS08KA2 and MC68HC908QT4, the MC68HC908QY4VDTE provides optimal balance of KBI hardware acceleration, 16-pin footprint, and industrial temperature support-making it preferred for space-constrained, key-driven control systems requiring guaranteed oscillator stability and brown-out immunity.

Availability

MC68HC908QY4VDTE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor interface, consumer electronics remote, and motor drive feedback controller applications requiring stable component supply and long-term industrial-grade availability.

Supply support for MC68HC908QY4VDTE 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

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division, now specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC68HC908QY4VDTE belongs to the legacy HCS08 microcontroller product line, designed specifically for cost-sensitive, low-power embedded control applications where integration, reliability, and ease of programming are prioritized over raw performance.

FAQ

What is the maximum operating frequency of the MC68HC908QY4VDTE?

The MC68HC908QY4VDTE supports a maximum bus frequency of 8 MHz when using its internal trimmed RC oscillator. This frequency is achieved with the internal oscillator running at 32 MHz and divided by four internally. External crystal operation supports up to 8 MHz directly on the OSC1/OSC2 pins. The MC68HC908QY4VDTE does not support frequencies beyond 8 MHz bus speed under any configuration.

Does the MC68HC908QY4VDTE include hardware-based keyboard scanning?

Yes, the MC68HC908QY4VDTE integrates a dedicated Keyboard Interrupt Module (KBI) that supports hardware scanning of up to eight keys with built-in debounce and wake-from-stop capability. This module uses Port A pins PTA0–PTA3 as row/column inputs and generates interrupts upon key press/release, eliminating the need for continuous CPU polling. The MC68HC908QY4VDTE's KBI is fully documented in Chapter 9 of the Rev. 6 datasheet.

What voltage thresholds does the Low-Voltage Inhibit (LVI) feature support on the MC68HC908QY4VDTE?

The MC68HC908QY4VDTE's LVI module supports two selectable brown-out detection thresholds: 2.5 V and 3.0 V nominal, with 100 mV hysteresis. Selection is controlled via the LVIEN bit and LVITRIM bits in the LVI status register. This allows system designers to align reset behavior with specific power supply characteristics. The MC68HC908QY4VDTE maintains functional operation down to 2.7 V, making the 2.5 V threshold appropriate for margin-critical applications.

Can the MC68HC908QY4VDTE operate from a 3.3 V supply?

Yes, the MC68HC908QY4VDTE is fully specified to operate across a supply voltage range of 2.7 V to 5.5 V, including standard 3.3 V systems. All I/O pins are 5 V tolerant when configured as inputs, and the internal oscillator, ADC, and peripherals maintain full functionality at 3.3 V. No external level shifters are required when interfacing with 3.3 V logic, and the MC68HC908QY4VDTE's electrical specifications in Section 16 confirm performance compliance at this voltage.

Is the MC68HC908QY4VDTE pin-compatible with other members of the QY/QT family?

No, the MC68HC908QY4VDTE is not pin-compatible with other QY/QT family members such as the MC68HC908QT4 or MC68HC908QY2. It uses a 16-pin SOIC package, while the QT4 uses a 20-pin SOIC and the QY2 uses an 8-pin SOIC. Pin functions differ across variants-for example, PTA4 serves as OSC2/BUSCLKX4 on the MC68HC908QY4VDTE but maps to different alternate functions in larger packages. Board-level compatibility requires matching the exact package and pin count.