PIC16C77T-20/PT - 8-Bit 20MHz 14KB OTP MCU | Microchip
MPN: PIC16C77T-20/PT β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.95 | $9.95 |
| 10 | $8.95 | $89.50 |
| 100 | $7.85 | $785.00 |
| 500 | $6.95 | $3,475.00 |
| 1,000 | $6.1 | $6,100.00 |
PIC16C77T-20/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces into one package. The PIC16C77 belongs to the PIC16 mid-range architecture, an 8-bit RISC family that executes one instruction per clock cycle (except branches), giving it deterministic throughput for embedded control. Within the broader PIC16CXX hierarchy, the PIC16C77 sits at the top of the family with the largest memory and highest I/O count, above the PIC16C73/74/76/765 cousins. As an OTP (One-Time Programmable) part, its EPROM program memory is written once via a programmer and is not electrically erasable, distinguishing it from the later flash-based PIC16F77.
Key features include 14KB of OTP program memory (8K x 14-bit words), 368 bytes of data RAM, 33 I/O pins, an integrated 8-channel 8-bit analog-to-digital converter, two Capture/Compare/PWM modules, a USART serial port, and a synchronous serial port (SSP) supporting SPI and I2C. The 20MHz maximum clock delivers 5 MIPS of instruction throughput, and the wide 2.5V-5.5V operating range (extended on the -I suffix variant) supports both 3.3V and 5V system designs.
The PIC16C77 uses a Harvard architecture with separate program and data buses, a 14-bit instruction word optimized for compact code, and Microchip's mid-range core. The CMOS static design means the clock can be stopped without losing internal state, making the part well suited to battery-backed applications. Peripherals are mapped into a single linear data-memory space and share a common interrupt structure.
Typical applications include industrial automation controllers, automotive body and chassis ECUs (the -I grade), appliance control boards, instrumentation front-ends, security system panels, and any embedded design requiring on-chip ADC plus serial communication. The 33 I/O pins and 8-channel ADC also suit multi-signal data-acquisition front-ends.
When designing with this part, note that OTP memory requires a device programmer with EPROM/UV-erase support and that the 'T' suffix indicates tape-and-reel packaging for high-volume assembly. For new designs prefer the flash-based PIC16F877 successor unless EPROM-based qualification is mandatory.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16C77T-20/PT β 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 PIC16C77T-20/PT (same form factor and footprint) β differing in Package, Program Memory Size, Program Memory Type, RoHS Status, Serial Interfaces.
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| Core Architecture | PIC16 mid-range 8-bit RISC |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 14 KB (8K x 14) |
| Data RAM | 368 bytes |
| Data EEPROM | Not present (OTP family) |
| Maximum Clock Frequency | 20 MHz |
| Instruction Throughput | 5 MIPS |
| Supply Voltage | 5 V nominal (4.0 V - 6.0 V operating range) |
| I/O Pins | 33 |
| ADC | 8-channel, 8-bit |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Capture/Compare/PWM | 2 modules (CCP) |
| Serial Interfaces | USART (SCI), SSP (SPI / I2C) |
| Package | 44-pin TQFP (PT) 10x10 mm |
| Operating Temperature | 0C to +70C (commercial); -40C to +85C on -I grade |
| Mounting Type | Surface Mount |
| RoHS Status | Not RoHS compliant (windowed/OTP legacy family) |
PIC16C77T-20/PT Pin Configuration
| Pin 1 | OSC1/CLKIN β Oscillator crystal input / external clock input |
| Pin 2 | RA0/AN0 β Port A bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 β Port A bit 1 / analog input 1 |
| Pin 4 | RA2/AN2 β Port A bit 2 / analog input 2 |
| Pin 5 | RA3/AN3/VREF β Port A bit 3 / analog input 3 / ADC reference |
| Pin 6 | RA4/T0CKI β Port A bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS β Port A bit 5 / analog input 4 / SSP slave select |
| Pin 8 | RE0/RD/AN5 β Port E bit 0 / read control for parallel port / analog input 5 |
| Pin 9 | RE1/WR/AN6 β Port E bit 1 / write control for parallel port / analog input 6 |
| Pin 10 | RE2/CS/AN7 β Port E bit 2 / chip select for parallel port / analog input 7 |
| Pin 11 | VDD β Positive supply (5 V) |
| Pin 12 | VSS β Ground |
| Pin 13 | OSC2/CLKOUT β Oscillator crystal output / clock output (Fosc/4) |
| Pin 14 | RC0/T1OSO/T1CKI β Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 15 | RC1/T1OSI/CCP2 β Port C bit 1 / Timer1 oscillator input / CCP2 module |
| Pin 16 | RC2/CCP1 β Port C bit 2 / CCP1 module |
| Pin 17 | RC3/SCK/SCL β Port C bit 3 / SPI clock / I2C clock |
| Pin 18 | RD0/PSP0 β Port D bit 0 / parallel slave port bit 0 |
| Pin 19 | RD1/PSP1 β Port D bit 1 / parallel slave port bit 1 |
| Pin 20 | RD2/PSP2 β Port D bit 2 / parallel slave port bit 2 |
| Pin 21 | RD3/PSP3 β Port D bit 3 / parallel slave port bit 3 |
| Pin 22 | RC4/SDI/SDA β Port C bit 4 / SPI data in / I2C data |
| Pin 23 | RC5/SDO β Port C bit 5 / SPI data out |
| Pin 24 | RC6/TX/CK β Port C bit 6 / USART TX / USART clock |
| Pin 25 | RC7/RX/DT β Port C bit 7 / USART RX / USART data |
| Pin 26 | RD4/PSP4 β Port D bit 4 / parallel slave port bit 4 |
| Pin 27 | RD5/PSP5 β Port D bit 5 / parallel slave port bit 5 |
| Pin 28 | RD6/PSP6 β Port D bit 6 / parallel slave port bit 6 |
| Pin 29 | RD7/PSP7 β Port D bit 7 / parallel slave port bit 7 |
| Pin 30 | VSS β Ground |
| Pin 31 | VSS β Ground |
| Pin 32 | VDD β Positive supply (5 V) |
| Pin 33 | RB0/INT β Port B bit 0 / external interrupt |
| Pin 34 | RB1 β Port B bit 1 |
| Pin 35 | RB2 β Port B bit 2 |
| Pin 36 | RB3/PGM β Port B bit 3 / low-voltage programming |
| Pin 37 | RB4 β Port B bit 4 |
| Pin 38 | RB5 β Port B bit 5 |
| Pin 39 | RB6/PGC β Port B bit 6 / ICSP clock |
| Pin 40 | RB7/PGD β Port B bit 7 / ICSP data |
| Pin 41 | MCLR/VPP β Master clear reset / programming voltage input |
| Pin 42 | NC β Not connected (per datasheet) |
| Pin 43 | NC β Not connected (per datasheet) |
| Pin 44 | NC β Not connected (per datasheet) |
Typical Applications
PIC16C77T-20/PT is suitable for 6 applications: Industrial Automation Controllers, Automotive Body and Chassis ECUs, Appliance Control Boards, Instrumentation Front-Ends, Security and Access-Control Panels, Multi-Sensor Data Acquisition.
Industrial Automation Controllers
The PIC16C77T-20/PT fits industrial automation controllers because it combines 14 KB of OTP program memory for fixed control logic, 33 I/O lines for multi-sensor/actuator wiring, and an 8-channel 8-bit ADC for analog monitoring in a single 44-pin TQFP package. At 20 MHz / 5 MIPS it executes PID loops and supervisory state machines at comfortable headroom for sub-millisecond scan times. Placed near field wiring with opto-isolation on each I/O; unlike a PLC it requires a programmed OTP part per firmware revision but eliminates PLC scan-engine jitter.
Recommended
Automotive Body and Chassis ECUs
The PIC16C77T-20I/PT industrial-grade variant suits automotive body ECUs such as window lift, mirror, and seat controllers. Its 33 I/O pins drive relays and H-bridges, the USART interfaces to a body-controller network, and the 8-channel ADC reads current-sense shunts and switch positions. Operating from -40C to +85C, it tolerates under-hood thermal stress; unlike modern 32-bit automotive MCUs it lacks CAN but is sufficient for sub-network slaves that communicate via LIN or USART.
Recommended
Appliance Control Boards
The PIC16C77T-20/PT powers white-goods control boards such as washing-machine and dishwasher HMIs. Its 33 I/O lines drive 7-segment displays, keypads, LED indicators, and triac-fired loads; the 8-bit ADC reads temperature sensors and water-level probes. The 20 MHz / 5 MIPS throughput runs the display refresh and load-control state machine without jitter; unlike ASIC controllers it allows post-production firmware customization for region-specific features.
Recommended
Instrumentation Front-Ends
The PIC16C77T-20/PT serves as the controller in portable instrumentation front-ends where its 8-channel 8-bit ADC digitizes multiple sensor channels, and its 14 KB OTP program memory stores calibration tables and menu logic. The USART uploads logged data to a host PC, while the 33 I/O lines drive LCD and keypad. At 5 MIPS it performs 8-bit FFTs and digital filtering in real time; unlike higher-end DSPs it stays at sub-1W power consumption for battery operation.
Recommended
Security and Access-Control Panels
The PIC16C77T-20/PT is well suited to security panels: 33 I/O lines scan keypads and PIR sensors, the USART links to a central monitoring station via modem, and the 14 KB OTP program memory protects against field firmware tampering. The 8-channel ADC monitors backup-battery voltage and tamper loops. Unlike mask-ROM controllers, OTP allows customized zone-mapping per installation; designers should choose the -I grade variant for outdoor cabinet temperature tolerance.
Recommended
Multi-Sensor Data Acquisition
The PIC16C77T-20/PT is a strong fit for multi-sensor data-acquisition modules: 8-channel 8-bit ADC digitizes thermocouples, strain gauges, and pressure transducers; 33 I/O lines expand to additional MUX'd channels via 74HC4051s; the SSP supports SPI/I2C for digital sensors. At 20 MHz it samples and averages channels fast enough for vibration monitoring; unlike an FPGA it integrates MCU + ADC + comms in a single chip, reducing BOM and PCB area in compact embedded modules.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C77T-20/PT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C77-20I/PT | PIC16F877-20I/PT | PIC16F877A-I/PT | PIC16C74BT-20I/PT | PIC16F874A-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-44 (PT) 10x10 mm | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same | TQFP-44 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 14 KB OTP | 14 KB OTP | 14 KB flash | 14 KB flash | 7 KB flash | 7 KB flash |
| RAM | 368 B | 368 B | 368 B | 368 B | 192 B | 192 B |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Max Clock | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS |
| Operating Temp | 0C to +70C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Memory Type | OTP EPROM (one-time) | OTP EPROM (one-time) | flash (10K cycles) | flash (10K cycles) | flash (1K cycles) | flash (10K cycles) |
| RoHS | Non-compliant | Non-compliant | Non-compliant | Compliant | Compliant | Compliant |
| ICD Debug | No (OTP only) | No (OTP only) | Yes | Yes | Yes | Yes |
Key Differentiators
- Largest program memory in PIC16C7X family (14 KB) (vs PIC16C74B family)
- PIC16C77 has 368 B RAM vs 192 B on PIC16C74B (vs PIC16C74B family)
- Industrial temperature -I grade available as PIC16C77-20I/PT (vs Standard commercial grade)
Design Notes
The PIC16C77T-20/PT is OTP EPROM, not flash. Once programmed, the firmware cannot be erased or rewritten electrically; firmware bugs require scrapping the part. For development, use a windowed ceramic package (PIC16C77-20/JW) or a flash-based PIC16F877A drop-in replacement. Do not assume the 'F' in PIC16F877A refers to firmware - it refers to flash memory technology.
Place a 100 nF decoupling capacitor as close as possible to each VDD pin (pins 11 and 32 on TQFP-44). Add a 10 uF bulk capacitor near the MCLR/VPP pin. The TQFP-44 (PT) package has 33 I/O lines, all of which can source/sink up to 25 mA per pin (max 200 mA total per port); design the PCB trace widths for peak port current, not average current, to avoid voltage-drop-induced logic-level violations.
OSC1/OSC2 crystal traces should be kept short (< 10 mm) and surrounded by a ground guard ring. For 20 MHz operation, use a fundamental-mode crystal with 15-33 pF load capacitors; higher harmonics will not oscillate reliably in the PIC mid-range oscillator. The MCLR pin must have a 10 kohm pull-up to VDD; do not leave it floating, as the part will reset intermittently on noise.
Route the analog inputs (RA0-RA5, RE0-RE2) on a separate PCB layer or keep them away from the digital port lines (RB/RC/RD). The 8-bit ADC on the PIC16C77 has no dedicated analog ground pin; place the VSS reference for analog signals at the same VSS pin used by the part. Without this, ADC readings can show 1-2 LSB of crosstalk from adjacent switching I/O lines.
Compliance Information
PIC16C OTP/EPROM family predates RoHS; non-compliant by design. Use PIC16F877A-I/PT for RoHS-compliant designs.