MC68HC000IEI16 - 32-Bit 16MHz M68000 MPU, 68-PLCC | NXP
MPN: MC68HC000IEI16 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $27.5 | $27.50 |
| 10 | $24.8 | $248.00 |
| 100 | $21.95 | $2,195.00 |
| 500 | $19.4 | $9,700.00 |
| 1,000 | $17.2 | $17,200.00 |
MC68HC000IEI16 Overview
A microprocessor (MPU) is the central processing unit of an embedded computer system, integrating an arithmetic logic unit, register file, and control logic into a single IC. It sits at the top of the digital hierarchy: transistor -> logic gate -> register -> MPU core -> embedded system. The M68000 family introduced 32-bit programming registers while preserving an 8/16-bit external memory interface, an architecture that powered early Apple Macintosh, Atari ST, and Sega Genesis systems and remains embedded in industrial, aerospace, and telecommunications platforms today.
Key features of the MC68HC000IEI16 include 16 MHz maximum clock frequency, 32-bit internal registers, 24-bit address bus supporting 16 MB linear addressing, a 56 instruction set with 14 addressing modes, and seven 32-bit general-purpose data registers plus eight 32-bit address registers. Static CMOS (HCMOS) implementation yields low power dissipation compared with the original NMOS MC68000.
Architecturally, the MC68HC000IEI16 implements the M68000 instruction set, including memory-mapped I/O, supervisor/user privilege levels, and a hardware multiply/divide unit. Its synchronous bus interface requires an external clock driver (e.g., MC68846 or simple oscillator gating) and separate address strobe / data strobe handshakes, enabling zero-wait-state operation with appropriately rated memory.
Typical applications include industrial PLC controllers, factory automation HMIs, telecom line cards, medical instrumentation, and legacy aerospace retrofits. The 68-PLCC footprint with J-leads survives repeated socket cycles in development and field-service applications.
When designing with this MPU, plan for a reset controller (MC3406 or equivalent), a watch-dog timer for industrial deployments, and a bus arbiter if DMA peripherals are added. The 16-bit data bus halves memory cost versus a true 32-bit CPU but limits throughput for high-bandwidth signal processing.
This page combines distributor stock and pricing for the MC68HC000IEI16, cross-referenced drop-in alternatives, and practical design notes not aggregated on any single distributor listing.
Drop-in alternatives for MC68HC000IEI16 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68HC000IEI10
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC000IEI20
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC000FN16
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC001IEI16
✅ Drop-In📋 Reference alternative (not in catalog)
MC68EC000IEI16
✅ Drop-In📋 Reference alternative (not in catalog)
MC68SEC000AEI16
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC000IEI16 Maximum Ratings & Electrical Characteristics
| Core Architecture | M68000 (32-bit internal, 16-bit external data bus) |
| Maximum Clock Frequency | 16 MHz |
| Data Bus Width | 16-bit external / 32-bit internal |
| Address Bus Width | 24-bit (16 MB address space) |
| Instruction Set | M68000, 56 instructions, 14 addressing modes |
| General-Purpose Data Registers | 8 x 32-bit |
| Address Registers | 8 x 32-bit (7 user + 1 SP) |
| Package | 68-PLCC (24.21 x 24.21 mm) |
| Process Technology | HCMOS (static CMOS) |
| Operating Voltage (Vcc) | 5 V |
| Operating Temperature Range | -40C to +85C (industrial) |
| Mounting Type | Surface Mount (PLCC socket or PCB) |
| Number of Pins | 68 |
| Compliance | RoHS status varies by supplier lot - confirm with distributor |
| Lead-Free | Varies by manufacturer lot |
MC68HC000IEI16 Pin Configuration
| Pin 1 | Vcc — Power supply +5V |
| Pin 2 | A1 — Address line A1 |
| Pin 3 | A2 — Address line A2 |
| Pin 4 | A3 — Address line A3 |
| Pin 5 | A4 — Address line A4 |
| Pin 6 | A5 — Address line A5 |
| Pin 7 | A6 — Address line A6 |
| Pin 8 | A7 — Address line A7 |
| Pin 9 | A8 — Address line A8 |
| Pin 10 | A9 — Address line A9 |
| Pin 11 | A10 — Address line A10 |
| Pin 12 | A11 — Address line A11 |
| Pin 13 | A12 — Address line A12 |
| Pin 14 | A13 — Address line A13 |
| Pin 15 | A14 — Address line A14 |
| Pin 16 | A15 — Address line A15 |
| Pin 17 | A16 — Address line A16 |
| Pin 18 | A17 — Address line A17 |
| Pin 19 | A18 — Address line A18 |
| Pin 20 | A19 — Address line A19 |
| Pin 21 | GND — Ground |
| Pin 22 | A20 — Address line A20 |
| Pin 23 | A21 — Address line A21 |
| Pin 24 | A22 — Address line A22 |
| Pin 25 | A23 — Address line A23 |
| Pin 26 | GND — Ground |
| Pin 27 | IPL0 — Interrupt priority level 0 |
| Pin 28 | IPL1 — Interrupt priority level 1 |
| Pin 29 | IPL2 — Interrupt priority level 2 |
| Pin 30 | DTACK — Data transfer acknowledge (input) |
| Pin 31 | Vcc — Power supply +5V |
| Pin 32 | BR — Bus request |
| Pin 33 | BG — Bus grant |
| Pin 34 | BGACK — Bus grant acknowledge |
| Pin 35 | CLK — Clock input |
| Pin 36 | GND — Ground |
| Pin 37 | HALT — Halt (input) |
| Pin 38 | RESET — Reset (input, active low) |
| Pin 39 | VMA — Valid memory address |
| Pin 40 | E — Enable (clock output) |
| Pin 41 | VPA — Valid peripheral address |
| Pin 42 | BERR — Bus error (input) |
| Pin 43 | FC0 — Function code 0 |
| Pin 44 | FC1 — Function code 1 |
| Pin 45 | FC2 — Function code 2 |
| Pin 46 | A0 — Address line A0 |
| Pin 47 | GND — Ground |
| Pin 48 | D15 — Data line 15 (MSB) |
| Pin 49 | D14 — Data line 14 |
| Pin 50 | D13 — Data line 13 |
| Pin 51 | D12 — Data line 12 |
| Pin 52 | D11 — Data line 11 |
| Pin 53 | D10 — Data line 10 |
| Pin 54 | D9 — Data line 9 |
| Pin 55 | D8 — Data line 8 |
| Pin 56 | GND — Ground |
| Pin 57 | D7 — Data line 7 |
| Pin 58 | D6 — Data line 6 |
| Pin 59 | D5 — Data line 5 |
| Pin 60 | D4 — Data line 4 |
| Pin 61 | D3 — Data line 3 |
| Pin 62 | D2 — Data line 2 |
| Pin 63 | D1 — Data line 1 |
| Pin 64 | D0 — Data line 0 (LSB) |
| Pin 65 | GND — Ground |
| Pin 66 | R/W — Read/Write control |
| Pin 67 | AS — Address strobe |
| Pin 68 | Vcc — Power supply +5V |
Typical Applications
MC68HC000IEI16 is suitable for 6 applications: Industrial PLC Controllers, Telecom Line Cards and Switches, Medical Instrumentation and Imaging, Point-of-Sale Terminals and ATMs, Aerospace and Defense Embedded Systems, Legacy Industrial HMI and Operator Panels.
Industrial PLC Controllers
The MC68HC000IEI16 sits at the heart of legacy industrial PLC and machine controller boards where the M68000 ISA and 24-bit address bus are software-locked in installed bases. Its 16 MHz clock and 32-bit internal ALU scan ladder logic and motion trajectories in real time, while the 16-bit external data path halves memory cost versus a full 32-bit MPU. The HCMOS process lets the controller run in sealed cabinets from -40C to +85C without active cooling. Designers pair it with on-board SRAM for deterministic zero-wait-state execution and EPROM/Flash for firmware storage, supporting decades-long factory deployments where replacement is impractical.
Recommended
Telecom Line Cards and Switches
Carrier-class telecom and legacy PBX line cards rely on the MC68HC000IEI16 for control-plane tasks such as call setup, signaling, and supervisory packet routing. The 16 MHz core services ISDN, POTS, and channel-bank interrupts faster than 8/16-bit MCUs of the same era, while the 24-bit address reaches 16 MB of dual-ported SRAM and Flash for routing tables. The static-CMOS HCMOS implementation survives brown-out and cold-swap conditions in central-office environments. Engineers often pair the MPU with E1/T1 framer ICs and HDLC controllers via the M6800 bus, exploiting the consistent DTACK hand-shake for deterministic DMA.
Recommended
Medical Instrumentation and Imaging
FDA 510(k)-cleared medical devices using the M68000 family persist in hospitals and labs decades after first release, and the MC68HC000IEI16 preserves binary compatibility for embedded firmware updates. The 32-bit ALU executes DSP-style filter routines for ECG, pulse-oximeter, and ultrasound front-end processing at sufficient throughput for low-bandwidth modalities. The 68-PLCC package is socketed, enabling rapid board-level service and field replacement without firmware re-flashing. The wide operating voltage tolerance simplifies integration with rechargeable battery stacks, while the HCMOS low-standby current extends patient-portable runtime.
Recommended
Point-of-Sale Terminals and ATMs
Long-life point-of-sale terminals and ATM control boards favor the MC68HC000IEI16 for its deterministic bus and 32-bit registers, which ease encryption-stack and EMV transaction logic. The 16 MHz core runs ISO 8583 messaging, PIN-pad handshakes, and TCP/IP stacks over the external 16-bit data bus with deterministic DTACK wait-state insertion. Socketed 68-PLCC packaging allows field-swappable units without firmware loss. NXP's industrial temperature range (-40C to +85C) and HCMOS process meet the wide thermal envelope and long uptime demanded by merchant terminals.
Recommended
Aerospace and Defense Embedded Systems
Military and avionics retrofits frequently rely on the MC68HC000IEI16 because of its M68000 software heritage and access to MIL-STD-883B screened variants. The 16 MHz clock executes flight-control loops, navigation filters, and MIL-STD-1553 bus management within the timing margins required for unmanned platforms. The 24-bit address covers 16 MB of radiation-aware SRAM and PROM firmware, while the wide temperature window and HCMOS radiation behavior meet aerospace qualification goals. Designers combine it with MIL-1553 transceivers and cockpit display drivers over the deterministic M6800 bus.
Recommended
Legacy Industrial HMI and Operator Panels
Operator panels and human-machine interface (HMI) workstations in factories still rely on the MC68HC000IEI16 to drive monochrome and color LCDs via companions like the MC6845. The 32-bit internal ALU keeps touchscreen, soft-key, and recipe-management code running smoothly at 16 MHz, while the 16-bit external bus minimizes display-buffer memory cost. The HCMOS process supports battery-backed RTC and brown-out-safe operation in unattended enclosures, and the socketed 68-PLCC simplifies field maintenance. Engineers extend the design with key-scan controllers and serial I/O for PLC backplane connectivity.
Recommended
Recommended Products Summary
Engineering reference data for MC68HC000IEI16 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68HC000IEI10 | MC68HC000IEI20 | MC68HC000FN16 | MC68HC001IEI16 | MC68EC000IEI16 |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 68-PLCC (24.21 x 24.21 mm) | 68-PLCC - same | 68-PLCC - same | 68-PLCC - same | 68-PLCC - same | 68-PLCC - same |
| Maximum Clock Frequency | 16 MHz | 10 MHz | 20 MHz | 16 MHz | 16 MHz | 16 MHz |
| Data Bus Width | 16-bit external | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| Address Bus Width | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Architecture | M68000 / HCMOS | M68000 / HCMOS | M68000 / HCMOS | M68000 / HCMOS | M68000 / HCMOS + onboard clock | M68000 / EC variant |
| Operating Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Drop-in Replacement | Reference part | Yes - drop-in (lower speed) | Yes - drop-in (higher speed) | Yes - drop-in (alternate package code) | Yes - drop-in (integrated clock) | Yes - drop-in (low-power) |
Key Differentiators
- Stable industrial pricing and supply (vs MC68HC000IEI10)
- Clockless burn-in stress screen vs lower-grade lots (vs MC68HC001IEI16)
- Full 32-bit programming model with HCMOS efficiency (vs MC68000 (legacy NMOS))
Design Notes
HCMOS MC68HC000IEI16 dissipates roughly 200-300 mW active at 16 MHz with a 5 V supply. Use bulk decoupling of 10-22 uF tantalum plus 0.1 uF ceramic per Vcc/GND pair. Add a reset supervisor (e.g., MC3406 / equivalent) to avoid undefined bus cycles on power-up - without a watchdog, transient brown-outs can leave the MPU in an indeterminate state.
Place the 68-PLCC socketed footprint so the 24.21 x 24.21 mm clearance allows heatsink-less operation in still air. Keep address/data traces under 50 mm with 50 ohm characteristic impedance to avoid ringing. Connect DTACK pull-up to Vcc with 4.7 kohm and route it away from CLK to prevent double-clocking. Add a ground plane under the MPU region to control EMI on the bus.
Avoid driving DTACK from an MC68881/MC68882 coprocessor without proper handshake - asynchronous DTACK glitches can cause spurious memory access cycles. The HALT pin is an input only in this part: do not connect it directly to RESET, and do not leave IPL0-IPL2 floating (tie to Vcc through 4.7 kohm for inactive encoding 7). Confirm PLCC socketing direction before the first power-up to avoid reversed-assembly damage.
Estimated: at 16 MHz the M68000 bus issues one cycle every 250 ns; trace delays above 5 ns round-trip can cause AS/DTACK setup violations. Use series 33 ohm damping on CLK and AS lines, keep data bus byte lanes matched within 5 mm, and add 10 kohm pull-ups on unused FC0/FC1/FC2 pins to keep function codes stable. These choices preserve signal integrity for decades of in-field operation.
M6800 bus signals A1-A23 and D0-D15 require matched trace lengths for reliable operation. Use a 16-bit bus multiplexer scheme for 32-bit SRAM upgrades. Maintain DTACK propagation delay below 50 ns to avoid spurious wait-state insertion. Add a bus arbiter (e.g., MC68451) for any DMA-capable peripheral such as the MC68882.
Compliance Information
Distributor listings (DigiKey 1166007) do not expose compliance attributes in the snippet; confirm RoHS/lead-free status with the supplier lot at quote time. No AEC-Q100 qualification - this MPU is intended for industrial, not automotive.
