NXP Semiconductors MC68336ACAB20

Overview

MC68336ACAB20 from Motorola is a 16-bit microcontroller unit (MCU) with integrated Time Processing Unit (TPU), 20.97 MHz CPU clock, 160-pin QFP package, and industrial temperature range (–40 to +85 °C). It serves as a real-time control processor in embedded motion systems, supporting deterministic timing for motor commutation and sensor interfacing.

For engineers reviewing the MC68336ACAB20 datasheet, MC68336ACAB20 pinout, MC68336ACAB20 application, or MC68336ACAB20 equivalent, key selection criteria include TPU-based event timing, 16-bit external bus interface, analog input capability (AN0–AN59), and compatibility with legacy 68K architecture designs.

Technical Context

The MC68336ACAB20 implements a 68300 core with 16-bit data bus and 24-bit address bus, enabling direct access to up to 16 MB of external memory. Its TPU provides 24 independent channels for precise input capture, output compare, and pulse-width modulation-critical for closed-loop motor control without CPU intervention.

It integrates on-chip peripherals including a 16-channel analog-to-digital converter (ADC), serial peripheral interface (SPI), UART, and programmable interrupt controller. The device uses a 160-pin QFP package with dedicated VDDA/VSSA pins for analog supply isolation and separate power domains for digital logic and I/O.

Key Specifications

Pinout & Package

MC68336ACAB20 is housed in a 160-pin plastic quad flat pack (QFP), Case 864A-03, measuring 28.0 × 28.0 mm with 0.65 mm lead pitch. Pin 1 and Pin 160 are No Connect (NC) per Revision D and later mask sets, ensuring pin compatibility with MC68376.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68376BACFT20, MC68336ACAB20 offers identical TPU and ADC capability but omits CAN - simplifying design where serial fieldbus is handled externally. Versus MC68332ACPV16, it adds 12 analog inputs and higher clock speed, enabling tighter control loop timing in servo applications.

Availability

MC68336ACAB20 is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controller (PLC) modules, automated test equipment (ATE), and power supply sequencing applications requiring stable component supply and long-term lifecycle support.

Supply support for MC68336ACAB20 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

Motorola Semiconductor (now NXP Semiconductors) is a pioneer in 68K architecture microcontrollers, delivering high-reliability embedded solutions for industrial and automotive markets since the 1980s.

The MC68336 product line was designed specifically for deterministic real-time control in motion systems, integrating the TPU to eliminate software-based timing bottlenecks in motor drive and actuator applications.

FAQ

What is the maximum operating frequency of the MC68336ACAB20?

The MC68336ACAB20 operates at a maximum CPU clock frequency of 20.97 MHz, derived from an external crystal oscillator (XTAL/EXTAL) and internal PLL. This frequency defines the instruction execution rate and TPU timing resolution, enabling sub-microsecond event handling in real-time control loops. The MC68336ACAB20 specification strictly maintains this value across its rated temperature range.

Does the MC68336ACAB20 include a CAN interface?

No, the MC68336ACAB20 does not include a CAN controller or physical layer interface. Unlike the MC68376 family, which adds dual CAN 2.0B modules, the MC68336ACAB20 relies on external CAN transceivers and software-managed protocols if fieldbus communication is required. This omission reduces pin count and simplifies layout for standalone motion control applications.

How many analog input channels does the MC68336ACAB20 support?

The MC68336ACAB20 supports 60 analog input channels (AN0 through AN59), mapped across two 8-bit port groups (PQA0–PQA7 and PQB0–PQB7). These inputs feed a shared 10-bit successive-approximation ADC with programmable sampling control, enabling simultaneous acquisition of motor current, voltage, and temperature feedback signals within a single control cycle.

What package type and dimensions does the MC68336ACAB20 use?

The MC68336ACAB20 uses a 160-pin plastic quad flat pack (QFP) per Case 864A-03 mechanical standard, measuring 28.0 × 28.0 mm with 0.65 mm lead pitch. Pins 1 and 160 are designated No Connect (NC) in Revision D and later mask sets, ensuring mechanical and pinout compatibility with the MC68376. Thermal pad exposure is not included in this package variant.

Is the MC68336ACAB20 pin-compatible with the MC68376?

Yes, the MC68336ACAB20 is pin-compatible with the MC68376 in Revision D and later mask sets, as both use identical 160-pin QFP packaging with NC on pins 1 and 160. However, functional differences exist: the MC68376 adds dual CAN controllers and mask-ROM options, while the MC68336ACAB20 retains full TPU and ADC functionality without CAN. PCB layout can be reused, but firmware and peripheral initialization must account for missing CAN registers.