NXP Semiconductors MC68SEC000AA16R2

Overview

MC68SEC000AA16R2 from Motorola (now NXP/Freescale) is a static 32-bit embedded microprocessor designed for ultra-low-power portable systems. It delivers 16 MHz operation at 3.3 V or 5.0 V, consumes only 0.5 µA in static standby mode, and features a 24-bit address bus with statically selectable 8-/16-bit data bus - enabling use in battery-powered PDAs, handheld test equipment, and electronic games.

For engineers reviewing the MC68SEC000AA16R2 datasheet, MC68SEC000AA16R2 pinout, MC68SEC000AA16R2 application, or MC68SEC000AA16R2 equivalent, key selection considerations include its pin-for-pin compatibility with MC68EC000, object-code compatibility across the M68000 Family, static clock-stop capability, and dual-voltage support for legacy and low-power system integration.

Technical Context

The MC68SEC000AA16R2 implements a fully static HCMOS version of the M68000 architecture with eight 32-bit data registers and eight 32-bit address registers, supporting 16-Mbyte linear addressing and 14 addressing modes. Its execution unit integrates prefetch/decode and bus controller logic to manage asynchronous bus cycles via AS, DTACK, UDS/LDS, and R/W signals.

Interrupt handling includes seven priority levels (IPL2–IPL0), nonmaskable Level 7, and autovectoring via AVEC input. Processor status outputs FC2–FC0 indicate supervisor/user mode and address space during active address strobe (AS), enabling precise memory-mapped I/O control without external state logic.

Key Specifications

Pinout & Package

MC68SEC000AA16R2 is supplied in a 64-lead Thin Quad Flat Pack (TQFP) package measuring 10.0 mm × 10.0 mm with 0.5 mm lead pitch - optimized for space-constrained portable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68EC000RC16 and MC68332ACPV16, the MC68SEC000AA16R2 uniquely balances ultra-low static power, drop-in hardware compatibility, and full M68000 software continuity - making it the optimal choice for extending legacy portable designs into battery-constrained environments without architectural overhaul.

Availability

MC68SEC000AA16R2 is available at Aetrix Electronics and suitable for handheld medical instruments, industrial portable testers, and consumer electronic games requiring stable component supply and long-term lifecycle support.

Supply support for MC68SEC000AA16R2 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 part of NXP Semiconductors via Freescale acquisition) pioneered high-reliability embedded microprocessors for industrial and consumer applications.

The MC68SEC000AA16R2 belongs to the M68000 Family static microprocessor line, engineered specifically to extend battery life in portable 32-bit systems while maintaining full software and hardware compatibility with existing MC68EC000 designs.

FAQ

What is the operating voltage range supported by the MC68SEC000AA16R2?

The MC68SEC000AA16R2 operates at either 3.3 V or 5.0 V, as specified in its ordering information. This dual-voltage capability allows direct replacement in both legacy 5 V systems and newer low-power 3.3 V designs without level-shifting circuitry. The device's internal logic and I/O structures are rated for safe operation across this full range, and its 0.5 µA standby current is measured at 3.3 V.

Is the MC68SEC000AA16R2 pin-compatible with the MC68EC000?

Yes, the MC68SEC000AA16R2 is pin-for-pin compatible with the MC68EC000 in both 64-lead QFP and TQFP packages. This includes identical signal assignments for A0–A23, D0–D15, AS, R/W, UDS/LDS, DTACK, RESET, HALT, IPL0–IPL2, and FC0–FC2. No PCB changes are required when upgrading from MC68EC000 to MC68SEC000AA16R2 in compatible package variants.

Does the MC68SEC000AA16R2 support true static operation?

Yes, the MC68SEC000AA16R2 implements a fully static HCMOS core, meaning it retains all internal register and status values indefinitely when the clock is stopped. This enables true zero-power standby mode with 0.5 µA typical current draw at 3.3 V, and instantaneous wake-up upon clock resumption - critical for battery-operated applications like PDAs and handheld testers.

What package type is used for the MC68SEC000AA16R2?

The MC68SEC000AA16R2 is packaged in a 64-lead Thin Quad Flat Pack (TQFP) with 10.0 mm × 10.0 mm body size and 0.5 mm lead pitch. This compact footprint is explicitly listed in the official ordering information for speed grade 16 MHz and temperature range 0°C to +70°C, distinguishing it from the larger 14.0 mm × 14.0 mm plastic QFP option.

How does the MC68SEC000AA16R2 handle interrupt vectoring?

The MC68SEC000AA16R2 supports seven programmable interrupt priority levels (0–6) plus a nonmaskable Level 7. Interrupt vectoring is performed automatically using the IPL0–IPL2 inputs and the AVEC (autovector) signal. When AVEC is asserted, the processor places the appropriate vector offset on the data bus during the interrupt acknowledge cycle, eliminating the need for external vector generation logic.