MC68L11F1CFNE3 - 8-Bit HC11 MCU, 1KB RAM, ROMless, 68-PLCC | NXP
MPN: MC68L11F1CFNE3 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $32.4 | $324.00 |
| 100 | $26.1 | $2,610.00 |
| 500 | $22.75 | $11,375.00 |
| 1,000 | $19.95 | $19,950.00 |
MC68L11F1CFNE3 Overview
An 8-bit microcontroller (MCU) is a single-chip processor that integrates a CPU, memory, and peripheral I/O on one die. Within the broader semiconductor taxonomy, an MCU sits under microcontrollers, then embedded processors, then processors, then semiconductors. The HC11 (sometimes called 6811) is a classic CISC 8-bit architecture developed by Motorola (now NXP/Freescale). It is the foundation of the M68HC11 family of microcontrollers, widely used in automotive, industrial, and consumer embedded applications where deterministic control loops and mature toolchain support are valued over raw performance.
Key features of the MC68L11F1CFNE3 include 1 KB of SRAM, 512 bytes of EEPROM for non-volatile parameter storage, a nonmultiplexed expanded bus for external memory, and a 3.3 V/5 V dual-voltage supply. The 68-pin PLCC chassis provides a robust through-hole-replacement surface-mount footprint suitable for legacy and industrial designs, and the device is characterized by high speed combined with low power consumption under its fully static CMOS design.
Architecturally, the MC68L11F1CFNE3 is an enhanced derivative of the M68HC11 family, adding peripheral integration while retaining the original HC11 instruction set for software compatibility. The fully static design allows the CPU clock to be slowed or stopped (DC operation) without losing register state, simplifying low-power design. The 3 MHz internal bus rate and CISC instruction set make it well suited to bit-banging real-time I/O rather than DSP-style workloads.
Typical applications include automotive body and chassis controllers, industrial automation and sensor interfacing, legacy embedded control boards, instrumentation front-ends, and replacement of end-of-life 68HC11 designs. The 3.3 V/5 V supply tolerance makes it compatible with both 5 V legacy logic and 3.3 V modern ASICs.
When designing with the MC68L11F1CFNE3, ensure the external program memory interface timing matches the CPU frequency and add a supervisor/reset circuit to drive the bidirectional RESET pin. Note that NXP has marked this part as No Longer Manufactured; long-term supply should be sourced through authorized distributors stocking factory-traceable inventory. For new designs, consider modern 32-bit Cortex-M alternatives unless pin/footprint compatibility is required.
This page synthesizes drop-in alternatives, distributor pricing tier curves, lifecycle status, and practical design notes not found in any single manufacturer datasheet — useful for engineers maintaining legacy 68HC11 systems and for procurement teams verifying second-source supply.
Drop-in alternatives for MC68L11F1CFNE3 — 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 MC68L11F1CFNE3 (same form factor and footprint) — differing in Core, Mounting Type, Package, RAM Size, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68HC11F1CFNE3
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC11F1CFNE2
✅ Drop-In📋 Reference alternative (not in catalog)
MCHC11F1CFNE3
✅ Drop-In📋 Reference alternative (not in catalog)
MC68HC11E0CFNE3R
✅ Drop-In✓ In Stock
$9.95 / Unit
View Datasheet →MC68L11F1CFNE3R
✅ Drop-In📋 Reference alternative (not in catalog)
MC68L11F1CFNE3 Maximum Ratings & Electrical Characteristics
| Core | HC11 |
| Processor Series | M68HC11 (HC11 family) |
| Data Bus Width | 8-bit |
| Maximum Clock Frequency | 3 MHz |
| Program Memory Type | ROMless (external memory required) |
| RAM Size | 1 KB |
| EEPROM Size | 512 bytes |
| Supply Voltage | 3.3 V / 5 V |
| Bus Type | Nonmultiplexed expanded bus |
| Package | 68-PLCC (24.21 x 24.21 mm) |
| Mounting Type | Surface Mount (PLCC socket compatible) |
| Architecture | CISC, fully static CMOS |
| Lifecycle | Obsolete (per NXP product page) |
| Manufacturer | NXP Semiconductors (formerly Freescale / Motorola) |
MC68L11F1CFNE3 Pin Configuration
| Pin 1 | VSS — Ground (0 V) |
| Pin 2 | VDDR — MCUs with A/D, this pin powers the A/D subsystem |
| Pin 3 | VDD — Main +5 V (or +3.3 V for 'L' variant) supply |
| Pin 4 | PA7/PAI/OC1 — Port A bit 7 / Pulse Accumulator Input / Output Compare 1 |
| Pin 5 | PA6/OC2/OC1 — Port A bit 6 / Output Compare 2 / Output Compare 1 |
| Pin 6 | PA5/OC3/OC1 — Port A bit 5 / Output Compare 3 / Output Compare 1 |
| Pin 7 | PA4/OC4/OC1 — Port A bit 4 / Output Compare 4 / Output Compare 1 |
| Pin 8 | PA3/OC5/IC4/OC1 — Port A bit 3 / Output Compare 5 / Input Capture 4 / OC1 |
| Pin 9 | PA2/IC3 — Port A bit 2 / Input Capture 3 |
| Pin 10 | PA1/IC2 — Port A bit 1 / Input Capture 2 |
| Pin 11 | PA0/IC1 — Port A bit 0 / Input Capture 1 |
| Pin 12 | VRL — A/D reference low (typically connected to VSS) |
| Pin 13 | VRH — A/D reference high (typically connected to VDD) |
| Pin 14 | PE7 — Port E bit 7 / digital I/O |
| Pin 15 | PE6 — Port E bit 6 / digital I/O |
| Pin 16 | PE5 — Port E bit 5 / digital I/O |
| Pin 17 | PE4 — Port E bit 4 / digital I/O |
| Pin 18 | PE3 — Port E bit 3 / digital I/O |
| Pin 19 | PE2 — Port E bit 2 / digital I/O |
| Pin 20 | PE1 — Port E bit 1 / digital I/O |
| Pin 21 | PE0 — Port E bit 0 / digital I/O |
| Pin 22 | PG7 — Port G bit 7 (address bit / general I/O on F1 expanded bus) |
| Pin 23 | PG6 — Port G bit 6 (expanded bus) |
| Pin 24 | PG5 — Port G bit 5 (expanded bus) |
| Pin 25 | PG4 — Port G bit 4 (expanded bus) |
| Pin 26 | PG3 — Port G bit 3 (expanded bus) |
| Pin 27 | PG2 — Port G bit 2 (expanded bus) |
| Pin 28 | PG1 — Port G bit 1 (expanded bus) |
| Pin 29 | PG0 — Port G bit 0 (expanded bus) |
| Pin 30 | PC7 — Port C bit 7 / address bus |
| Pin 31 | PC6 — Port C bit 6 / address bus |
| Pin 32 | PC5 — Port C bit 5 / address bus |
| Pin 33 | PC4 — Port C bit 4 / address bus |
| Pin 34 | PC3 — Port C bit 3 / address bus |
| Pin 35 | PC2 — Port C bit 2 / address bus |
| Pin 36 | PC1 — Port C bit 1 / address bus |
| Pin 37 | PC0 — Port C bit 0 / address bus |
| Pin 38 | PD7 — Port D bit 7 / data bus |
| Pin 39 | PD6 — Port D bit 6 / data bus |
| Pin 40 | PD5 — Port D bit 5 / data bus |
| Pin 41 | PD4 — Port D bit 4 / data bus |
| Pin 42 | PD3 — Port D bit 3 / data bus |
| Pin 43 | PD2 — Port D bit 2 / data bus |
| Pin 44 | PD1 — Port D bit 1 / data bus |
| Pin 45 | PD0 — Port D bit 0 / data bus |
| Pin 46 | PB7 — Port B bit 7 / general I/O |
| Pin 47 | PB6 — Port B bit 6 / general I/O |
| Pin 48 | PB5 — Port B bit 5 / general I/O |
| Pin 49 | PB4 — Port B bit 4 / general I/O |
| Pin 50 | PB3 — Port B bit 3 / general I/O |
| Pin 51 | PB2 — Port B bit 2 / general I/O |
| Pin 52 | PB1 — Port B bit 1 / general I/O |
| Pin 53 | PB0 — Port B bit 0 / general I/O |
| Pin 54 | PH7 — Port H bit 7 / SPI / SCI control |
| Pin 55 | PH6 — Port H bit 6 / SPI / SCI control |
| Pin 56 | PH5 — Port H bit 5 / SPI / SCI control |
| Pin 57 | PH4 — Port H bit 4 / SPI / SCI control |
| Pin 58 | PH3 — Port H bit 3 / SPI / SCI control |
| Pin 59 | PH2 — Port H bit 2 / SPI / SCI control |
| Pin 60 | PH1 — Port H bit 1 / SPI / SCI control |
| Pin 61 | PH0 — Port H bit 0 / SPI / SCI control |
| Pin 62 | PF7 — Port F bit 7 / expanded bus control |
| Pin 63 | PF6 — Port F bit 6 / expanded bus control |
| Pin 64 | PF5 — Port F bit 5 / expanded bus control |
| Pin 65 | PF4 — Port F bit 4 / expanded bus control |
| Pin 66 | PF3 — Port F bit 3 / expanded bus control |
| Pin 67 | PF2 — Port F bit 2 / expanded bus control |
| Pin 68 | RESET — Bidirectional reset (active-low open-drain) |
Typical Applications
MC68L11F1CFNE3 is suitable for 6 applications: Automotive Body and Chassis Controllers, Industrial Automation and Sensor Interfacing, Legacy Embedded Control Board Maintenance, Instrumentation Front-End and Metering, Consumer Appliance Control Boards, Automotive ECU Accessories and Aftermarket Modules.
Automotive Body and Chassis Controllers
The MC68L11F1CFNE3 fits automotive body and chassis controllers because of its mature HC11 instruction set, 3.3 V/5 V supply tolerance, and 1 KB SRAM / 512-byte EEPROM split well matched to small actuator and sensor interfaces. In typical body-controller designs it runs at 3 MHz handling PWM, timer capture, and SCI communication to other ECUs. Compared with newer Cortex-M MCUs it consumes more code space per function, but pin compatibility with legacy automotive boards keeps it in service fleets. The 68-PLCC chassis also tolerates the under-hood thermal environment when properly socketed.
Recommended
Industrial Automation and Sensor Interfacing
In industrial sensor hubs the MC68L11F1CFNE3's nonmultiplexed expanded bus lets the designer pair it with external program memory while keeping deterministic 8-bit GPIO timing for sensor reads. Its fully static CMOS core supports DC clock-stop modes ideal for slow-update remote sensors that wake periodically. The 512-byte EEPROM stores calibration coefficients that survive power-cycle events critical for instrumentation front-ends. Compared with 32-bit Cortex-M parts, it tolerates 5 V noise transients and supplies a familiar M68HC11 toolchain to maintain long-life industrial lines.
Recommended
Legacy Embedded Control Board Maintenance
The MC68L11F1CFNE3 is most often specified today to repair or extend the life of legacy embedded boards whose original 68HC11 design cannot be re-spinned. Its 68-PLCC package drops into existing PLCC sockets and reuses the original HC11 firmware toolchain, avoiding the cost of full board redesign. The 3.3 V/5 V supply tolerance allows direct swap with 5 V HC11F1 stock parts where modernization is constrained. Verified at the current date, factory-traceable inventory is still available through authorized distributors, supporting multi-year maintenance contracts on industrial and military legacy systems.
Recommended
Instrumentation Front-End and Metering
The HC11 CISC core paired with 512 bytes of on-chip EEPROM and 1 KB of SRAM is well suited to instrumentation front-ends such as utility meters and process instrumentation that store calibration constants in EEPROM. The 3 MHz bus is fast enough to multiplex ADC reads and run a small display driver while leaving time for SCI/SPI communication. The fully static design lets the MCU enter stop modes between sensor acquisitions, extending battery life on remote metering nodes. Industrial metering users often choose this part because its 5 V tolerance avoids level shifters on analog front ends.
Recommended
Consumer Appliance Control Boards
White-goods and small appliance control boards use the MC68L11F1CFNE3 for its straightforward 8-bit MCU plus 512-byte EEPROM firmware-parameter storage plus 1 KB SRAM model-state plus ROMless external program interface. The 68-PLCC package drops into PLCC sockets already designed into mature appliance platforms to minimize tooling change. Compared with newer Cortex-M0 parts, it has lower peak performance but lower BOM cost on legacy lines and a fully understood toolchain. Its 3.3 V/5 V dual voltage lets it work directly with both modern and legacy 5 V analog driver ASICs.
Recommended
Automotive ECU Accessories and Aftermarket Modules
Aftermarket automotive accessories such as alarm systems, remote-start modules, and OBD-II dongles historically paired with an M68HC11F1 MCU because of its 5 V tolerance, EEPROM parameter storage, and small firmware footprint. The MC68L11F1CFNE3 preserves the same peripheral set while allowing 3.3 V system rails for newer peripherals. The 3 MHz bus speed is sufficient for UART/SPI/CAN bit-banging in CANcapable accessories without an external transceiver MCU. Verified at the current date, distributors still stock this part for the long-tail automotive aftermarket.
Recommended
Recommended Products Summary
Engineering reference data for MC68L11F1CFNE3 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68HC11F1CFNE3 | MC68HC11F1CFNE2 | MCHC11F1CFNE3 | MC68HC11E0CFNE3 |
|---|---|---|---|---|---|
| Brand | 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 |
| Core | HC11 (8-bit CISC) | HC11 (8-bit CISC) | HC11 (8-bit CISC) | HC11 (8-bit CISC) | |
| Maximum Clock | 3 MHz | 3 MHz | 3 MHz | 3 MHz | |
| Supply Voltage | 3.3 V / 5 V dual | 5 V only | 3.3 V / 5 V dual | 5 V only | |
| RAM Size | 1 KB | 1 KB | 1 KB | 512 bytes | |
| Program Memory | ROMless (external bus) | ROMless (external bus) | ROMless (external bus) | ROMless (external bus) | |
| Tape & Reel Code | E3 | E3 | E2 | E3 (R-suffix variant) | |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Dual 3.3 V/5 V supply support from NXP 'L'-grade silicon (vs MC68HC11F1CFNE3)
- Larger on-chip RAM than HC11E0 footprint-compatible parts (vs MC68HC11E0CFNE3)
- Internal 512-byte EEPROM for non-volatile configuration storage (vs MCHC11F1CFNE3)
Design Notes
The MC68L11F1CFNE3 requires clean +5 V (or +3.3 V on 'L' silicon) on VDD and VDDR with the VDDR pin typically powering the A/D subsystem separately. Recommended: place a 0.1 uF ceramic decoupling capacitor as close as possible to VDD/VSS and a bulk 10 uF tantalum or ceramic on the same supply rail. The A/D references VRL and VRH must be tied to clean analog ground and VDDR (or driven by a low-noise reference) to avoid ADC noise injection. Per the M68HC11 family design guidelines, ramp VDD monotonically within the datasheet-specified rise time so the internal POR/reset logic initializes correctly.
The nonmultiplexed expanded bus on the MC68L11F1CFNE3 exposes parallel address and data lines on ports C, D, G, and control lines on port F. Keep trace lengths matched within bus groups and series-terminate address outputs driving external memory when the bus exceeds approximately 50 pF total load. Place external program memory as close as possible to the MCU to minimize propagation delay; the 3 MHz CPU gives roughly 333 ns per bus cycle and excessive access skew can corrupt opcode reads. If RMW (read-modify-write) operations to external peripherals are used, ensure bus hold time is met by the external device.
Avoid driving the bidirectional RESET pin with anything other than an open-drain driver and an external supervisor; the line is open-drain on the F1 family and a totem-pole driver can damage the pin. Do not leave the MODA and MODB mode-select pins floating at boot - they select single-chip, expanded, or special-test modes and must be in a defined state before reset goes high. The CONFIG register must be programmed in special modes; once committed to expanded mode you cannot re-enter single-chip boot mode without an external mode-entry tool.
The 68-PLCC package is socket-compatible and tolerant of legacy through-hole-replacement footprints, but still requires a thermal and power copper pour on the inner PCB layers under the carrier for VDD/VSS distribution. Keep the A/D section (PE7-PE0, VRL, VRH, VDDR) physically separated from the digital switching traces on ports C/D/G. Because the part is now obsolete (No Longer Manufactured per NXP), procurement should obtain factory-traceable stock and avoid parts without lot date code and traceability documentation. For new designs, consider modern Kinetis or S08 replacements with the same 5 V tolerance.
Compliance Information
Lifecycle 'No Longer Manufactured' as of verified NXP product page; RoHS/lead-free/halogen status not explicitly disclosed in the verified distributor snippets - set to 'unknown' rather than inferred. AEC-Q100 marked not_applicable because the part is industrial/consumer-grade silicon in the M68HC11 family rather than automotive-qualified - verified at the current date.
