PIC16C54C-20I/SO - 8-bit 20MHz OTP MCU 12 I/O | Microchip
MPN: PIC16C54C-20I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.78 | $1.78 |
| 10 | $1.62 | $16.20 |
| 100 | $1.43 | $143.00 |
| 500 | $1.28 | $640.00 |
| 1,000 | $1.15 | $1,150.00 |
PIC16C54C-20I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, RAM, ROM/Flash program memory, and peripherals. It executes instructions fetched from internal program memory, processes data in working registers, and drives I/O pins. The PIC16C5X family is part of the broader microcontroller hierarchy (8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC). OTP program memory means the device is programmed once and cannot be electrically erased, reducing cost for high-volume fixed-code products.
Key specifications include 33 single-word/single-cycle RISC instructions (most execute in 200ns at 20MHz), a two-level hardware stack, direct/indirect/relative addressing modes, an 8-bit timer/counter (TMR0), and a 4.5V to 5.5V supply range. Power management includes a SLEEP mode to minimize quiescent current in battery-friendly designs. The PIC16C5X architecture is fully static, allowing the clock to be stopped without losing register state.
The PIC16C54C employs a Harvard-class bus organization with a 12-bit-wide instruction path and an 8-bit data path. Seven or eight special-function hardware registers implement the programming model. Watchdog timer with on-chip RC oscillator provides autonomous brown-out recovery, improving field reliability in unattended industrial installations.
Typical applications include consumer appliance controllers, LED lighting drivers, simple sensor signal conditioning, battery chargers, and small white-goods motor control. The wide temperature range (-40C to +85C industrial) and 20MHz throughput suit industrial 2D automation sub-systems.
When designing, ensure your programmer supports the OTP EPROM algorithm of PIC16C5X and reserve pinout compatibility with the PIC16C55C, PIC16C56C, PIC16C57C, and PIC16C58C for code-scaling flexibility.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the PIC16C54C-20I/SO not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC16C54C-20I/SO — 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 PIC16C54C-20I/SO (same form factor and footprint) — differing in Package, Program Memory Size, Program Memory Type, Watchdog Timer, RAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C54C-20E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54C-04I/SO
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →PIC16F54-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C54A-20I/SO
✅ Drop-In✓ In Stock
$1.15 / Unit
View Datasheet →PIC16C54C-20I/SO Maximum Ratings & Electrical Characteristics
| Core | 8-bit PIC16C5X |
| Program Memory Size | 768 B (512 x 12) OTP |
| RAM | 25 B |
| CPU Speed | 20 MHz |
| I/O Pins | 12 |
| Supply Voltage | 4.5 V to 5.5 V |
| Instruction Set | 33 single-word/single-cycle RISC instructions |
| Package | 18-SOIC (0.295 inch, 7.50 mm width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Timer | 8-bit TMR0 with 8-bit prescaler |
| Stack | Two-level hardware stack |
| Watchdog Timer | Yes, with on-chip RC oscillator |
| Program Memory Type | OTP EPROM |
| Data EEPROM | None |
| Architecture | Harvard (12-bit instruction / 8-bit data) |
| ROHS Status | Compliant |
PIC16C54C-20I/SO Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RA4/T0CKI — Bidirectional I/O port A bit 4 / Timer0 clock input |
| Pin 4 | MCLR — Master Clear reset input (active low) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0/INT — Bidirectional I/O port B bit 0 |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 14 | VDD — Positive supply voltage (4.5V to 5.5V) |
| Pin 15 | OSC2/CLKOUT — Oscillator output / clock output (Fosc/4) |
| Pin 16 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Typical Applications
PIC16C54C-20I/SO is suitable for 6 applications: Consumer Appliance Control, LED Lighting Drivers, Battery Chargers and Power Management, Small Motor Control, Sensor Signal Conditioning, Simple White-Goods Control.
Consumer Appliance Control
The PIC16C54C-20I/SO is well-suited for low-cost consumer appliance controllers including coffee makers, toasters, rice cookers, and small kitchen gadgets. Its 20MHz CPU throughput executes 33 single-cycle RISC instructions in 200ns, easily handling keypad scanning, LED indicator multiplexing, and relay/solenoid actuation loops. The 12 I/O pins drive 7-segment displays directly or matrix-scan a 3x4 keypad with zero external logic. OTP memory locks the final firmware against reverse engineering, important for high-volume consumer products where BOM cost dominates. Industrial -40C to +85C rating tolerates kitchen and laundry ambient conditions. With sleep current consumption of <1 µA typical, battery-backed clock and timer functions extend product shelf life.
Recommended
LED Lighting Drivers
The PIC16C54C-20I/SO drives RGB LED controllers, decorative light strings, and architectural lighting fixtures where fixed color sequences replace expensive DMX hardware. Its 25 bytes of RAM and 768-byte OTP memory hold 16-bit PWM tables for up to 4 LED channels with smooth color blending. The 12 I/O pins drive constant-current LED drivers like the CL220 or BC847-based discrete sinks. The 200ns instruction cycle allows software PWM at 8-bit resolution above 1 kHz, eliminating flicker in camera-visible applications. OTP firmware prevents field tampering with lighting shows. Industrial temperature range suits outdoor installations when paired with conformal coating.
Recommended
Battery Chargers and Power Management
The PIC16C54C-20I/SO implements CC/CV charge profile controllers for sealed lead-acid, NiMH, and small Li-ion packs in power tools and toys. Its on-chip watchdog timer with on-chip RC oscillator provides autonomous brown-out recovery without external components, critical for unattended chargers. The 4.5V to 5.5V supply range is directly compatible with USB-derived 5V rails. ADC-free architecture uses comparator-based current sensing with software integration, simplifying the BOM. OTP memory locks the charge algorithm preventing field firmware corruption. Industrial temperature rating supports garage and outdoor applications. Sleep current under 1 µA preserves battery shelf life when not charging.
Recommended
Small Motor Control
The PIC16C54C-20I/SO drives BLDC, brushed DC, and stepper motors in white-goods fans, small pumps, and toys. Its 20MHz throughput executes software commutation loops for 6-step BLDC at up to 30,000 RPM electrical with zero hardware assist. The two-level hardware stack limits interrupt nesting, but PIC16C5X polled architecture avoids interrupts entirely for predictable timing. TMR0 with 8-bit prescaler generates PWM frequencies from 1 kHz to 20 kHz for silent motor operation. OTP firmware locks proprietary motor profiles against cloning. Industrial -40C to +85C rating tolerates under-hood automotive and pump environments.
Recommended
Sensor Signal Conditioning
The PIC16C54C-20I/SO conditions analog sensor signals in HVAC, building automation, and industrial process controls where cost dominates precision requirements. Its digital I/O pins interface directly to comparator outputs from op-amps and discrete sensors. Software-based linearization and look-up tables compensate thermistor, RTD, and photodiode non-linearities using only 25 bytes of RAM and 768 bytes of OTP. The 20MHz throughput samples sensors at 5 kHz with software filtering. OTP firmware prevents unauthorized calibration changes. Industrial temperature rating suits outdoor and unheated installations.
Recommended
Simple White-Goods Control
The PIC16C54C-20I/SO replaces mechanical timers and electromechanical controllers in washing machines, dishwashers, and microwave ovens. Its 12 I/O pins drive 7-segment displays, keypads, and relay banks directly, eliminating discrete logic ICs and reducing BOM cost. The 768-byte OTP memory holds complete wash-cycle, cook-profile, or dishwasher programs with safety interlocks. Two-level hardware stack simplifies firmware verification to V-model IEC 61508 SIL-1 light industrial compliance. OTP firmware locks proprietary algorithms against field modification. Industrial temperature rating supports under-cabinet and utility-room installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C54C-20I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C54C-20E/SO | PIC16C54C-04I/SO | PIC16F54-I/SO | PIC16C54A-20I/SO |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (7.50 mm) | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same | 18-SOIC (7.50 mm) - same |
| Program Memory | 768 B OTP | 768 B OTP - same | 768 B OTP - same | 768 B Flash - re-programmable | 768 B OTP - same |
| Max CPU Speed | 20 MHz | 20 MHz | 4 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 2.0V to 5.5V | 4.5V to 5.5V |
| Operating Temperature | -40C to +85C | -40C to +125C (extended) | -40C to +85C | -40C to +85C | -40C to +85C |
| I/O Pins | 12 | 12 | 12 | 12 | 12 |
| RAM | 25 B | 25 B | 25 B | 25 B | 25 B |
Key Differentiators
- Highest-speed OTP option in PIC16C5X family (vs PIC16C54C-04I/SO)
- Industrial temperature grade for harsh environments (vs PIC16C54C-20E/SO)
- Cost-optimized OTP for high-volume production (vs PIC16F54-I/SO)
Design Notes
PIC16C54C-20I/SO requires a clean 4.5V to 5.5V supply. Place a 100 nF decoupling capacitor within 5 mm of the VDD pin and a 10 µF bulk capacitor near the IC. The /SO suffix indicates lead-free matte-tin finish rated for 260°C peak reflow per JEDEC J-STD-020. Brown-out detection is NOT integrated; external reset supervisor like MCP100 or equivalent is recommended for industrial reliability.
Estimated: oscillator start-up with low-cost ceramic resonators at 20 MHz requires 1 ms power-on delay before code execution. Pull MCLR high through a 10 kΩ resistor and add a 100 nF cap to ground for clean reset. Do not drive I/O pins before configuring TRISA/TRISB - all pins default to input to prevent output contention at power-up. Watchdog timer must be cleared within its 18 ms (typical) period or full reset occurs.
The 18-SOIC package has a thermal resistance theta-JA of approximately 75 C/W, adequate for the 5V/20MHz/12-I/O operating envelope. Place the IC at least 3 mm from board edges to avoid ESD stress during handling. Route the MCLR trace away from RB7 high-voltage programming signals to prevent noise-induced spurious resets during in-circuit programming via ICSP.
Compliance Information
RoHS compliant per Microchip product page. /SO suffix indicates lead-free matte-tin plating. Not AEC-Q100 qualified - choose PIC16C54C-20E/SO or other automotive-grade PIC16 variants for AEC-Q100 requirements.
