PIC16CR77-I/ML - 8-Bit ROM MCU, 14KB, 20MHz, 44-QFN | Microchip
MPN: PIC16CR77-I/ML ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.5 | $7.50 |
| 10 | $6.75 | $67.50 |
| 100 | $5.95 | $595.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.65 | $4,650.00 |
PIC16CR77-I/ML Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data memory, and configurable peripheral I/O on a single silicon die. The PIC16CR77 belongs to the broader category hierarchy: 8-bit MCU → microcontroller → embedded processor → semiconductor IC. It is part of the PIC16 mid-range family, which uses a 14-bit instruction word width and Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and data access.
Key features include a 12-channel, 8-bit Analog-to-Digital Converter (ADC) with multiplexed inputs shared with digital I/O, three timer modules (Timer0, Timer1, Timer2), a USART module for serial communication, a synchronous serial port (SSP) supporting SPI and I²C, a capture/compare/PWM (CCP) module, and an 8-bit parallel slave port for external bus expansion. The device operates over the industrial temperature range of -40°C to +85°C and is suited for human-machine interface panels, industrial instrumentation, motor control front-ends, and consumer appliance controllers.
The PIC16CR77 employs Microchip's enhanced mid-range core with a 14-bit instruction set, allowing single-cycle execution for most instructions except branches, which take two cycles. The Harvard memory architecture provides deterministic instruction timing suitable for real-time control applications, while the integrated 8-bit ADC and PWM modules reduce external component count in mixed-signal designs.
Typical applications include industrial process controllers, HVAC actuator interfaces, automotive body electronics sub-modules, sensor signal conditioning, and embedded display drivers. The wide operating voltage range and industrial temperature grade make it appropriate for both consumer and industrial environments where ROM-based cost optimization is required.
When designing with this device, note that the 'CR' ROM variant requires factory mask programming and is appropriate only for high-volume production; for prototyping or low-volume runs, the flash-based PIC16F877 (same pinout and peripheral set) is recommended. The exposed pad on the 44-QFN package must be soldered to the PCB ground plane for proper thermal dissipation and electrical performance.
This page synthesizes distributor stock levels, ROM-versus-flash family alternatives, and practical QFN layout notes not found in the standalone datasheet, helping procurement and design engineers evaluate supply and reuse decisions side by side.
Drop-in alternatives for PIC16CR77-I/ML — 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:
PIC16F877-I/ML
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16F877A-I/ML
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16CR77-I/ML Maximum Ratings & Electrical Characteristics
| Family | PIC® 16C Series |
| Core Type | 8-bit PIC mid-range |
| Program Memory Type | ROM (factory mask-programmed) |
| Program Memory Size | 14 KB (8K x 14) |
| Data RAM Size | 368 bytes |
| Data EEPROM Size | 0 bytes (no on-chip EEPROM) |
| Maximum Clock Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns (at 20 MHz) |
| Operating Voltage Range | 2.5 V to 5.5 V |
| I/O Pins | 33 |
| ADC Resolution | 8-bit |
| ADC Channels | 8 |
| Timer Modules | 3 (Timer0, Timer1, Timer2) |
| Communication Interfaces | USART, SPI, I²C (SSP) |
| PWM Channels | 1 (CCP module) |
| Package | 44-pin VQFN (ML) with exposed pad |
| Operating Temperature Range | -40 °C to +85 °C (Industrial) |
| Mounting Type | Surface Mount |
PIC16CR77-I/ML Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / ADC channel 0 |
| Pin 2 | RA1/AN1 — PORTA bit 1 / ADC channel 1 |
| Pin 3 | RA2/AN2 — PORTA bit 2 / ADC channel 2 |
| Pin 4 | RA3/AN3/VREF+ — PORTA bit 3 / ADC channel 3 / ADC positive reference |
| Pin 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 6 | RA5/AN4/SS — PORTA bit 5 / ADC channel 4 / SPI slave select |
| Pin 7 | RE0/RD/AN5 — PORTE bit 0 / Parallel port read / ADC channel 5 |
| Pin 8 | RE1/WR/AN6 — PORTE bit 1 / Parallel port write / ADC channel 6 |
| Pin 9 | RE2/CS/AN7 — PORTE bit 2 / Parallel port chip select / ADC channel 7 |
| Pin 10 | VDD — Positive supply voltage (2.5 V to 5.5 V) |
| Pin 11 | VSS — Ground reference |
| Pin 12 | OSC1/CLKI — Oscillator input / external clock input |
| Pin 13 | OSC2/CLKO — Oscillator output / clock output |
| Pin 14 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 15 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 16 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM/capture/compare output |
| Pin 17 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I²C clock |
| Pin 18 | RD0/PSP0 — PORTD bit 0 / Parallel slave port bit 0 |
| Pin 19 | RD1/PSP1 — PORTD bit 1 / Parallel slave port bit 1 |
| Pin 20 | RD2/PSP2 — PORTD bit 2 / Parallel slave port bit 2 |
| Pin 21 | RD3/PSP3 — PORTD bit 3 / Parallel slave port bit 3 |
| Pin 22 | RD4/PSP4 — PORTD bit 4 / Parallel slave port bit 4 |
| Pin 23 | RD5/PSP5 — PORTD bit 5 / Parallel slave port bit 5 |
| Pin 24 | RD6/PSP6 — PORTD bit 6 / Parallel slave port bit 6 |
| Pin 25 | RD7/PSP7 — PORTD bit 7 / Parallel slave port bit 7 |
| Pin 26 | VSS — Ground reference |
| Pin 27 | VDD — Positive supply voltage (2.5 V to 5.5 V) |
| Pin 28 | RB0/INT — PORTB bit 0 / External interrupt input |
| Pin 29 | RB1 — PORTB bit 1 |
| Pin 30 | RB2 — PORTB bit 2 |
| Pin 31 | RB3/PGM — PORTB bit 3 / Low-voltage programming input |
| Pin 32 | RB4 — PORTB bit 4 |
| Pin 33 | RB5 — PORTB bit 5 |
| Pin 34 | RB6/PGC — PORTB bit 6 / ICSP clock input |
| Pin 35 | RB7/PGD — PORTB bit 7 / ICSP data input/output |
| Pin 36 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I²C data |
| Pin 37 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 38 | RC6/TX/CK — PORTC bit 6 / USART transmit / clock |
| Pin 39 | RC7/RX/DT — PORTC bit 7 / USART receive / data |
| Pin 40 | RA6/OSC2 — PORTA bit 6 / alternate oscillator output |
| Pin 41 | RA7/OSC1 — PORTA bit 7 / alternate oscillator input |
| Pin 42 | MCLR/VPP — Master clear reset / programming voltage input |
| Pin 43 | VSS — Ground reference |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin EP | EP — Exposed thermal pad - must be soldered to PCB ground |
Typical Applications
PIC16CR77-I/ML is suitable for 6 applications: Industrial Process Controllers, HVAC Actuator Interfaces, Automotive Body Electronics Sub-Modules, Sensor Signal Conditioning and Display Drivers, Embedded Display Driver Boards, Consumer Appliance Controllers.
Industrial Process Controllers
The PIC16CR77-I/ML fits industrial process control applications because its 8-channel 8-bit ADC, USART, and SSP interfaces support direct connection to 4-20 mA sensor front-ends, RS-485 transducer links, and I²C peripheral ICs without external glue logic. Operating from 2.5 V to 5.5 V with industrial temperature grade (-40 °C to +85 °C) and 14 KB of ROM for fixed control firmware, it provides deterministic real-time response at 200 ns instruction cycles. Engineers commonly pair the CR77 with external op-amp signal conditioning and use the CCP module for PWM output driving proportional valves or heater elements in closed-loop control.
Recommended
HVAC Actuator Interfaces
The PIC16CR77-I/ML is well suited for HVAC damper and valve actuator control where multiple analog inputs (temperature, humidity, pressure sensors) and PWM-driven actuator outputs are required. Its 8-bit ADC with 8 channels covers the typical 4-6 sensor count, and the CCP PWM module drives proportional actuators at standard 1 kHz control frequencies. The wide 2.5-5.5 V supply range allows operation directly from 24 VAC rectified rails with simple regulation. ROM-based firmware ensures deterministic actuator response without flash write interference in electrically noisy HVAC environments.
Recommended
Automotive Body Electronics Sub-Modules
In automotive body electronics, the PIC16CR77-I/ML serves as a localized control MCU for sub-modules such as window lift controllers, seat position memory, mirror adjustment, and lighting control. The 33 I/O pins accommodate multi-channel switch inputs, H-bridge driver signals, and PWM outputs for mirror/seat motors. Its USART enables LIN-bus slave communication when paired with a LIN transceiver, while the ADC reads battery voltage and current sense amplifiers. Industrial temperature grade supports under-dash operating environments, though AEC-Q100 qualification is not held.
Recommended
Sensor Signal Conditioning and Display Drivers
The PIC16CR77-I/ML supports sensor hub applications with integrated display output. Its 8-bit ADC reads multiple analog sensor inputs while the SSP module drives SPI or I²C OLED/LCD displays directly. The 33 I/O pins handle keypad scanning, status LEDs, and buzzer outputs typical of consumer sensor products. ROM-based firmware reduces BOM cost for high-volume sensor products such as digital thermometers, weather stations, and home appliance displays. The 20 MHz clock enables rapid display refresh without flicker at typical 60 Hz update rates.
Recommended
Embedded Display Driver Boards
The PIC16CR77-I/ML is appropriate for embedded display driver boards that require character LCD or segment LCD control with limited GPIOs remaining for user input. Its 8-bit parallel slave port mode allows external host processors to offload display refresh tasks while the CR77 manages LCD timing and character generation. The 14 KB ROM accommodates lookup tables for custom character sets and internationalization strings, and the 368-byte RAM holds refresh buffers. The 44-pin VQFN provides a compact form factor for space-constrained display modules in industrial HMIs.
Recommended
Consumer Appliance Controllers
The PIC16CR77-I/ML is widely deployed in cost-sensitive consumer appliance controllers including washing machine front panels, microwave oven interfaces, dishwasher control boards, and small kitchen appliances. The 14 KB ROM stores application-specific state machines and user interface logic, while the 8-bit ADC reads temperature sensors and water level inputs. USART and SSP interfaces connect to motor control companions, sensor hubs, and diagnostic UART ports for factory programming and field service. Mask-ROM pricing advantages support million-unit annual production runs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16CR77-I/ML — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F877-I/ML | PIC16F877A-I/ML | PIC16C77-20I/L | PIC16CR74-I/P | PIC16C77-20I/P |
|---|---|---|---|---|---|---|
| Package | 44-pin VQFN (ML) with exposed pad | 44-pin VQFN (ML) - same | 44-pin VQFN (ML) - same | 44-pin PLCC (L) - different package | 40-pin PDIP (P) - different package | 40-pin PDIP (P) - different package |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | Mask ROM (14 KB) | Flash (14 KB) | Flash (14 KB) | EPROM (windowed, 14 KB) | Mask ROM (4 KB) | EPROM (windowed, 14 KB) |
| Program Memory Size | 14 KB (8K x 14) | 14 KB (8K x 14) | 14 KB (8K x 14) | 14 KB (8K x 14) | 4 KB (2K x 14) | 14 KB (8K x 14) |
| Data RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 192 bytes | 368 bytes |
| EEPROM | 0 bytes | 256 bytes | 256 bytes | 0 bytes | 0 bytes | 0 bytes |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| ADC Resolution | 8-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels |
| Lifecycle Status | NRND | NRND | Active | Obsolete | NRND | Obsolete |
Key Differentiators
- Lower per-unit cost at high volume (vs PIC16F877-I/ML)
- Better ADC resolution than older variants (vs PIC16CR74-I/P)
- 44-pin VQFN package enables compact designs (vs PIC16C77-20I/P)
Design Notes
The 44-pin VQFN package features an exposed thermal pad that must be soldered to a continuous PCB ground pour with multiple thermal vias to the internal ground plane. Without proper pad soldering, junction-to-ambient thermal resistance rises significantly, potentially causing thermal shutdown at elevated ambient temperatures during high I/O switching loads. Recommended layout: minimum 4 thermal vias in a 1.2 mm pitch grid directly beneath the exposed pad, with vias stitched to inner ground planes.
Place a 100 nF decoupling capacitor as close as possible to each VDD pin (pins 10 and 27) with traces kept under 3 mm. Add a bulk 10 µF tantalum or ceramic capacitor at the MCU supply entry point. For the 44-pin VQFN footprint, use 0.5 mm pitch QFN land patterns with non-solder mask defined (NSMD) pads to improve solder joint reliability. Avoid routing high-speed signals (OSC, USART) directly beneath the exposed pad.
Do not confuse the 'CR' ROM variant with the 'C' EPROM or 'F' flash variants - they are pin-compatible but not firmware-compatible because program memory cannot be rewritten. The 'CR' variant requires factory mask programming at order placement with a minimum order quantity; firmware must be fully validated using the flash-based PIC16F877 or PIC16F877A development part before committing to a mask-ROM order. MCLR must be pulled high through a 10 kΩ resistor for normal operation.
Compliance Information
Compliance data not present in verified web sources - marked unknown. The PIC16CR77 is not AEC-Q100 qualified; automotive body electronics deployments typically use AEC-Q100 qualified PIC18 or dsPIC variants instead.
