NXP Semiconductors MC68SEC000AE20

Overview

MC68SEC000AE20 from Motorola (later Freescale) is a static 32-bit embedded microprocessor designed for ultra-low-power portable systems. It delivers 20 MHz operation at 3.3 V or 5.0 V, consumes only 0.5 µA in static standby mode, supports 24-bit addressing (16 MB), and features pin-for-pin compatibility with the MC68EC000 - enabling drop-in replacement in battery-powered PDAs, handheld test equipment, and electronic games.

For engineers reviewing the MC68SEC000AE20 datasheet, MC68SEC000AE20 pinout, MC68SEC000AE20 application, or MC68SEC000AE20 equivalent, this page provides verified architecture details, low-power mode behavior, 64-pin QFP/TQFP package mapping, static bus control timing, and object-code compatibility across the M68000 Family - all critical for legacy system maintenance and power-constrained redesigns.

Technical Context

The MC68SEC000AE20 implements a fully static HCMOS version of the M68000 architecture, allowing clock suspension without data loss and supporting both 8-bit and 16-bit data bus configurations via the MODE pin. Its asynchronous bus controller uses AS, R/W, UDS/LDS, and DTACK for flexible memory and peripheral interfacing without external glue logic.

It features seven interrupt levels with autovectoring (IPL0–IPL2 + AVEC), supervisor/user mode separation via FC0–FC2 function codes, and full object-code compatibility with the entire M68000 Family - including upward migration paths to 68020/68030 and ColdFire with minor modifications.

Key Specifications

Pinout & Package

MC68SEC000AE20 is supplied in a 64-lead plastic Quad Flat Pack (QFP) with 0.8 mm lead spacing and 14.0 mm × 14.0 mm body size. Pin numbering follows standard counter-clockwise layout starting from corner marker (Pin 1 = A19).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68EC000RC20, MC68SEC000AE20 enables true zero-power sleep states; compared with MC68332ACPV16, it offers minimal BOM impact and guaranteed firmware compatibility - making it optimal for power-sensitive drop-in replacements where peripheral integration is already handled externally.

Availability

MC68SEC000AE20 is available at Aetrix Electronics and suitable for handheld medical instruments, industrial data loggers, legacy game console refurbishment, and point-of-sale terminal upgrades requiring stable component supply and long-term obsolescence mitigation.

Supply support for MC68SEC000AE20 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 (later Freescale Semiconductor) was a pioneering developer of 68000-family microprocessors, known for robust architecture, broad toolchain support, and industrial-grade reliability.

The MC68SEC000AE20 belongs to Motorola's static embedded microprocessor line, engineered specifically to extend battery life in portable 32-bit systems while maintaining full software and hardware compatibility with the established MC68EC000 ecosystem.

FAQ

What is the operating voltage range for the MC68SEC000AE20?

The MC68SEC000AE20 operates across two nominal supply rails: 3.3 V ±0.3 V and 5.0 V ±0.5 V. This dual-voltage capability allows direct integration into both modern low-voltage designs and legacy 5 V systems without level-shifting circuitry. The device maintains full functionality and timing compliance at either voltage, with standby current specified at 0.5 µA typical under 3.3 V conditions - a key differentiator for battery-powered use cases.

Is the MC68SEC000AE20 pin-compatible with the MC68EC000?

Yes, the MC68SEC000AE20 is explicitly designed as a pin-for-pin replacement for the MC68EC000 in the 64-pin QFP package. Signal names, pin positions, and electrical characteristics match identically - enabling direct PCB-level substitution. This compatibility extends to power, ground, clock, reset, and all bus control signals (AS, R/W, UDS, LDS, DTACK), ensuring no layout or schematic modification is required when upgrading from MC68EC000 to MC68SEC000AE20.

Does the MC68SEC000AE20 support 8-bit data bus operation?

Yes, the MC68SEC000AE20 supports static 8-bit data bus operation via the MODE input pin. When MODE is held high, the processor uses D7–D0 for data transfers while ignoring D15–D8; when low, it operates in full 16-bit mode. This configuration is fixed at power-up and does not require runtime switching - simplifying interface design to 8-bit memories or peripherals without bus transceivers or multiplexing logic.

What is the minimum current draw of the MC68SEC000AE20 in low-power mode?

The MC68SEC000AE20 draws a typical 0.5 µA in static standby mode at 3.3 V, with the clock halted and internal state preserved. This ultra-low quiescent current is achieved through its fully static HCMOS design, which eliminates dynamic power dissipation. Actual consumption may vary slightly with temperature and process variation, but remains within the 1–2 µA range across the commercial temperature range (0°C to +70°C) specified for the AE20 suffix.

Which development tools support the MC68SEC000AE20?

All third-party development tools qualified for the MC68EC000 - including compilers (e.g., MetaWare High-C), debuggers (e.g., P&E Micro BDM), and emulators (e.g., Introl ICE) - natively support the MC68SEC000AE20 due to its object-code and hardware compatibility. No toolchain modification is needed; existing M68000-family source code compiles and executes unchanged, leveraging the same linker scripts, startup code, and peripheral initialization sequences used for MC68EC000-based systems.