MC68331CPV20B1 - 32-Bit 20MHz ROMless MCU | Motorola
MPN: MC68331CPV20B1 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.5902 | $5.59 |
| 10 | $5.5902 | $55.90 |
| 100 | $5.5902 | $559.02 |
| 500 | $5.5902 | $2,795.10 |
| 1,000 | $5.5902 | $5,590.20 |
MC68331CPV20B1 Overview
What is a ROMless microcontroller? A ROMless microcontroller is a microprocessor or microcontroller that contains a CPU core and peripherals but does not include its application program in an internal ROM. External memory supplies the firmware, allowing program size and memory technology to be selected independently of the MCU. In the system hierarchy, the MC68331 belongs to the microcontroller, embedded processor, and semiconductor categories, while its CPU32 core connects it to Motorola embedded-control products.
The 32-bit architecture and 20 MHz operating frequency are the principal verified performance characteristics. ROMless operation is useful when firmware must be updated, when several products can share one processor platform, or when external memory must provide the required capacity. The 144-LQFP package provides a substantial pin count for processor signals, buses, interrupts, timers, serial interfaces, and other embedded-system connections, although the complete pin assignments are not present in the supplied verified data.
The device is suitable for industrial control, communications equipment, data acquisition, instrumentation, embedded gateways, and legacy CPU32 designs when a 20 MHz embedded controller and external program memory are acceptable. Compared with a microcontroller containing integrated flash, the ROMless approach shifts memory implementation to the board designer and can simplify large-program or field-update architectures. The trade-off is that the external memory interface, address decoding, and memory timing become part of the system design.
Before placing the part, verify the manufacturer datasheet for electrical limits, clock requirements, memory-interface timing, reset behavior, and the complete 144-pin pinout. The supplied search data confirms availability, pricing, package information, and core specifications, but does not provide a complete official electrical table or a verified pin mapping. Do not infer those values from the package name alone.
This product page consolidates the verified distributor description, source links, pricing data, and engineering cautions for the MC68331CPV20B1. It also documents where external memory, clock design, PCB routing, and legacy software compatibility require further verification before production release.
Drop-in alternatives for MC68331CPV20B1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC68331CPV20B1 (same form factor and footprint) — differing in Architecture, Manufacturer, Package, Product Type, Program Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesMC68331CPV20B1 Maximum Ratings & Electrical Characteristics
| Product Type | CPU32 32-bit microcontroller |
| Architecture | 32-bit |
| Maximum Clock Frequency | 20 MHz |
| Program Memory | ROMless |
| Manufacturer | Motorola |
| Package | 144-LQFP |
| Package Dimensions | 20 mm x 20 mm |
| Terminal Count | 144 terminals |
| Package Family | LQFP |
| Mounting Type | Surface mount |
| Core | CPU32 |
MC68331CPV20B1 lqfp Pin Configuration Guide
Pin configuration for MC68331CPV20B1 (lqfp package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for MC68331CPV20B1.
Refer to the datasheet for full pin configuration.
Typical Applications
MC68331CPV20B1 is suitable for 6 applications: Industrial Control, Communications Equipment, Data Acquisition, Embedded Instrumentation, Legacy CPU32 Embedded Platforms, External-Firmware Systems.
Industrial Control
The MC68331CPV20B1 fits embedded industrial-control platforms that need a 32-bit CPU and a 20 MHz operating point. Its ROMless architecture lets the designer select external firmware memory according to application size, technology, and update strategy. Use it where board-level memory routing is acceptable and where the wider 144-LQFP package is manageable. The design must add verified clock, reset, power, and memory-interface checks before the MCU is released to production.
Recommended
Communications Equipment
The MC68331CPV20B1 can serve as the processor in communications equipment when a 32-bit CPU32 core, external program memory, and 20 MHz clock are suitable. ROMless operation permits firmware to be stored in external memory, which may help separate programmable logic from processor packages and support larger code images. The package exposes many external signals for system connections, but exact UART, SPI, timer, interrupt, and bus assignments must be taken from the complete manufacturer pinout.
Recommended
Data Acquisition
For data-acquisition equipment, the MC68331CPV20B1 provides a 32-bit processor foundation and a 20 MHz clock reference for coordinating sampling, control, and host communication. External memory can hold application firmware while the board supplies data storage and interface electronics. The main engineering consideration is that the ROMless device requires careful address decoding and memory timing. Verify the exact peripheral pinout and electrical limits before selecting it for precision or high-rate acquisition.
Recommended
Embedded Instrumentation
The MC68331CPV20B1 is suitable for legacy embedded instrumentation when a CPU32 system, external program memory, and deterministic board-level control are required. Its 144-LQFP package offers a large pin count for buses, interrupts, control signals, and peripheral connections, but its physical size and routing requirements must be considered against newer smaller packages. The 20 MHz figure describes the verified processor frequency; end-to-end instrument timing still depends on external circuitry, firmware, and memory behavior.
Recommended
Legacy CPU32 Embedded Platforms
The MC68331CPV20B1 is most naturally considered for legacy CPU32 embedded platforms that already depend on Motorola processor conventions and external memory designs. A 32-bit, 20 MHz ROMless architecture can preserve an established software and board ecosystem while supporting continued product maintenance. Migration is not automatic: designers should confirm package pinout, clock behavior, reset requirements, memory timing, peripheral mappings, and toolchain compatibility. This use case is especially relevant when redesigning an existing CPU32 board rather than creating a new compact design.
Recommended
External-Firmware Systems
The ROMless architecture of the MC68331CPV20B1 supports systems that separate firmware storage from the processor package. Designers can evaluate external memory density, bus timing, reset initialization, and update mechanisms independently of the MCU. This is useful in equipment requiring multiple firmware configurations or external memory upgrades, but it adds board complexity compared with an integrated-flash MCU. The verified 32-bit, 20 MHz CPU32 identification makes the part suitable for evaluation in legacy external-memory control architectures.
Recommended
Recommended Products Summary
Engineering reference data for MC68331CPV20B1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | Motorola |
| Package | 144-LQFP, 20 mm x 20 mm |
| Architecture | 32-bit CPU32 |
| Clock Frequency | 20 MHz |
| Program Memory | ROMless |
| Terminal Count | 144 terminals |
| Surface-Mount Package | LQFP |
| Starting Price | $5.5902 as of 2026-10-21 |
| Availability Signal | In stock at LCSC in supplied result |
| Verified Drop-In Alternative | No verified candidate |
Key Differentiators
- ROMless external-memory architecture (vs Generic flash-based 32-bit MCUs)
- 20 MHz CPU32 processing target (vs Lower-frequency 8-bit and 16-bit microcontrollers)
- Large 144-LQFP integration (vs Compact QFN and small-LQFP MCUs)
Design Notes
Verify the complete supply-voltage limits, absolute maximum ratings, pin-power distribution, and decoupling requirements from the manufacturer datasheet before laying out the MC68331CPV20B1. The verified data confirms a 32-bit, 20 MHz ROMless CPU32 but does not provide the electrical table. Do not infer supply rails or capacitor values from the 144-LQFP package; use the official power and pin requirements, including sequencing for external memory and I/O.
Treat external program-memory routing as a first-class PCB signal-integrity and timing problem. The supplied data does not identify the external bus width, timing, address map, or memory voltage, so the board designer must obtain those details from the manufacturer datasheet before placing traces or selecting termination. Start with short, impedance-controlled routes where required, provide a defined reset state, and validate memory access across voltage and temperature corners.
Do not treat MC68331CPV20B1 as an interchangeable generic 32-bit MCU solely because a distributor describes it as CPU32, 20 MHz, and ROMless. The target package is 144-LQFP, while alternative MC68331 order codes may differ in speed grade, temperature grade, package, or mask revision. Confirm the complete pinout, clock requirements, memory interface, peripheral mappings, lifecycle status, and toolchain support before using any replacement.
Compliance Information
The supplied verified web results provide product identity, package, frequency, architecture, price, and a point-in-time availability signal, but no compliance declarations. Compliance fields are therefore unknown rather than inferred.
