PIC16C55-HS/P - 8-bit OTP MCU 20MHz 768B | Microchip
MPN: PIC16C55-HS/P ✗ Cuối đờiPIC16C55-HS/P Tóm tắt
What is an 8-bit OTP microcontroller? An OTP microcontroller integrates CPU, RAM, ROM/EPROM, and peripherals in a single chip; OTP (one-time programmable) means the program memory can be written once with a device programmer and is non-erasable, which lowers per-unit cost versus flash or EEPROM for high-volume fixed-function products. PIC microcontrollers belong to the Harvard-architecture RISC family (peripheral > microcontroller > embedded controller > semiconductor) and remain widely deployed where deterministic instruction timing and small pin counts dominate.
Key features of the PIC16C55-HS/P include a 2-level hardware stack, direct/indirect/relative addressing modes, one 8-bit real-time counter (TMR0) with programmable prescaler, watchdog timer, power-on reset, and a power-saving SLEEP mode. The device exposes 20 bidirectional I/O pins grouped into two ports (PORTA, PORTB) plus dedicated RESET, OSC1/OSC2 clock pins. All I/O pins source/sink up to 25 mA, enough to drive LEDs and small relays directly.
Architecturally, the PIC16C5x uses a fixed instruction set of 33 single-cycle commands executed from on-chip EPROM; the 12-bit opcode plus 2-stage pipeline yields most instructions completing in one oscillator cycle (~200 ns at 20 MHz). Self-programming is not supported; production code is loaded by MPLAB PM3 or compatible device programmers prior to PCB soldering or via ICSP-style test points.
Typical applications include appliance controllers, simple sensor/actuator boards, smart-card readers, hobby/education boards, and other high-volume fixed-function consumer products where cost dominates and field firmware updates are unnecessary. Designers value the deterministic instruction timing and the very low sleep current for battery-friendly idle states.
When designing with this part, derate I/O source/sink to stay below the absolute 25 mA per-pin / 200 mA per-package limits, and budget for an external R/C or crystal oscillator network on OSC1/OSC2 since no internal oscillator is provided. The 28-PDIP footprint is friendly to through-hole prototyping and hand-rework for low-volume production.
This page consolidates distributor stock, price tiers, drop-in alternatives from the PIC16C5x family, and applied design notes not all present on the manufacturer summary page.
Bộ thay thế dễ dàng lắp đặt cho PIC16C55-HS/P — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16C55-HS/P (cùng hình factor và footprint) — khác nhau ở Package, Timers, Program Memory Size, Program Memory Type, Core Architecture.
PIC16C54-HS/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C56-HS/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55A-20I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55A-04E/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-10/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-10/SP
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F54-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-HS/P Tỷ lệ tối đa & tính chất điện
| Core | PIC16C5x 8-bit RISC (12-bit instructions) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 768 B (512 x 12) |
| RAM | 24 B |
| Data EEPROM | Not present |
| Tần số xung maksimum | 20 MHz |
| Điện áp cung cấp | 3.3 V to 5.5 V |
| I/O Pins | 20 |
| Timers | 1 x 8-bit (TMR0 with prescaler) |
| Hardware Stack | 2-level |
| Instruction Set | 33 instructions, single-cycle |
| Watchdog Timer | Yes |
| Power-on Reset | Yes |
| Brown-out Reset | Not present |
| ICSP / In-Circuit Programming | Not supported on PIC16C5x |
| Oscillator Modes | RC, XT, HS, LP (external) |
| Khoảng nhiệt độ hoạt động | 0 C to +70 C (commercial, per HS speed grade) |
| I/O Source/Sink | 25 mA per pin |
| Hộp | 28-PDIP (0.600 in, 15.24 mm) |
| Kiểu lắp đặt | Through-Hole |
Cấu hình chân PIC16C55-HS/P
| Chân 1 | RA2 — Bidirectional I/O, PORTA bit 2 |
| Chân 2 | RA3 — Bidirectional I/O, PORTA bit 3 |
| Chân 3 | RA4/T0CKI — Bidirectional I/O / TMR0 clock input |
| Chân 4 | MCLR — Master Clear (active-low reset) |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RA0 — Bidirectional I/O, PORTA bit 0 |
| Chân 7 | RA1 — Bidirectional I/O, PORTA bit 1 |
| Chân 8 | RA2 — Bidirectional I/O (port-mirror in baseline PIC16C5X) |
| Chân 9 | RA3 — Bidirectional I/O (port-mirror in baseline PIC16C5X) |
| Chân 10 | RB0/INT — Bidirectional I/O, PORTB bit 0 |
| Chân 11 | RB1 — Bidirectional I/O, PORTB bit 1 |
| Chân 12 | RB2 — Bidirectional I/O, PORTB bit 2 |
| Chân 13 | RB3 — Bidirectional I/O, PORTB bit 3 |
| Chân 14 | RB4 — Bidirectional I/O, PORTB bit 4 |
| Chân 15 | RB5 — Bidirectional I/O, PORTB bit 5 |
| Chân 16 | RB6 — Bidirectional I/O, PORTB bit 6 (also programming clock) |
| Chân 17 | RB7 — Bidirectional I/O, PORTB bit 7 (also programming data) |
| Chân 18 | VSS — Ground reference (second VSS pin) |
| Chân 19 | VDD — Positive supply, +3.3 V to +5.5 V |
| Chân 20 | OSC2/CLKOUT — Oscillator crystal / clock output |
| Chân 21 | OSC1/CLKIN — Oscillator crystal / clock input |
| Chân 22 | RB7 — PORTB bit 7 (port-mirror in baseline PIC16C5X) |
| Chân 23 | RB6 — PORTB bit 6 (port-mirror in baseline PIC16C5X) |
| Chân 24 | RB5 — PORTB bit 5 (port-mirror in baseline PIC16C5X) |
| Chân 25 | RB4 — PORTB bit 4 (port-mirror in baseline PIC16C5X) |
| Chân 26 | RB3 — PORTB bit 3 (port-mirror in baseline PIC16C5X) |
| Chân 27 | RB2 — PORTB bit 2 (port-mirror in baseline PIC16C5X) |
| Chân 28 | RB1 — PORTB bit 1 (port-mirror in baseline PIC16C5X) |
Ứng dụng tiêu biểu
PIC16C55-HS/P phù hợp cho 6 Áp dụngs: Appliance Controller Board, Smart Card / RFID Reader Slave Controller, Hobby / Education Development Board, Simple Sensor / Actuator Board, LED Display / Marquee Driver, Industrial Push-Button / Keypad Front Panel.
Appliance Controller Board
The PIC16C55-HS/P suits appliance controller boards (washing machines, dishwashers, microwave ovens) because its 20 MHz HS grade delivers the cycle-budget to scan a 4x4 keypad matrix, multiplex a 4-digit 7-segment display, and drive TRIACs for load switching within a 10 ms main loop. The 20 I/O pins are partitioned as PORTA (keypad rows + TRIAC triggers) and PORTB (display segments + status LEDs) with TMR0 providing the 1 ms tick. OTP memory is acceptable in this application because firmware is finalized at production and cost dominates. The 28-PDIP through-hole package also survives the higher mechanical and thermal stress of white-goods manufacturing versus SMD.
Được đề xuất
Smart Card / RFID Reader Slave Controller
The PIC16C55-HS/P operates as a slave protocol converter in legacy smart-card and 125 kHz RFID reader boards, where the 20 MHz clock gives 200 ns instruction cycles - enough to bit-bang ISO 7816 T=0 character frames at 9600 baud while servicing the host UART. Twenty I/O pins accommodate the smart-card socket (VCC, RST, CLK, I/O, PRES), the host interface (TX, RX, RTS), the LED indicators, and the beeper driver. The deterministic instruction timing of the baseline PIC core is preferred over interrupt-driven parts because the synchronous card clock must be generated without jitter. OTP is acceptable because the reader protocol is fixed at production.
Được đề xuất
Hobby / Education Development Board
The PIC16C55-HS/P is a popular MCU on legacy hobby and education boards (e.g. PICSTART-compatible training kits) because the 28-PDIP package is easy to socket, hand-solder, and replace when students accidentally short outputs. The 33-instruction baseline PIC instruction set is the simplest in Microchip's portfolio, making it the canonical teaching device for Harvard-architecture, accumulator-based programming. Each instruction executes in one cycle (200 ns at 20 MHz), letting students observe exact timing on an oscilloscope without instruction-pipeline ambiguity. The OTP requirement teaches the full programming workflow: write code, compile with MPASM, program with PM3, and verify.
Được đề xuất
Simple Sensor / Actuator Board
The PIC16C55-HS/P is well-suited to fixed-function sensor and actuator boards such as thermostat remotes, fan controllers, and irrigation valves, where the firmware reads a thermistor via RC time on T0CKI, debounces a few buttons, and pulses a relay driver. The single 8-bit TMR0 with prescaler delivers 1 s ticks from a 32.768 kHz timebase or 50 ms ticks from the 20 MHz system clock without needing additional timer peripherals. Twenty I/O pins cover sensor inputs, button matrix, status LEDs, and relay drivers; the 25 mA I/O source rating directly drives small relays and LED indicators. The SLEEP mode reduces quiescent current to the low-microamp range for battery-friendly idle.
Được đề xuất
LED Display / Marquee Driver
The PIC16C55-HS/P drives 8x8 or smaller multiplexed LED marquees at 20 MHz, where each row refresh must complete within 1.25 ms to avoid visible flicker (i.e. <125 microseconds per row at 100 Hz refresh). Twenty I/O pins accommodate an 8-row + 8-column multiplex matrix with spare pins for brightness PWM via TMR0 compare and serial configuration via a UART bit-bang on RB0/RB1. The deterministic instruction timing of the baseline PIC core produces clean row-multiplex timing without DMA or interrupts. OTP is acceptable because display patterns are pre-computed and stored in lookup tables; PIC16C56-HS/P (1k x 12) is preferred when more font tables are required.
Được đề xuất
Industrial Push-Button / Keypad Front Panel
The PIC16C55-HS/P serves as the front-panel MCU in industrial equipment where a 4x4 metal keypad, status LEDs, and a beeper must be scanned while a host PLC communicates over RS-485. The 20 MHz clock provides 200 ns instruction cycles to debounce and scan the keypad in under 1 ms, freeing the main task to forward keystrokes to the host. Twenty I/O pins cover the keypad (8 lines), status LEDs (6 lines), beeper (1 line), and the RS-485 interface (TX, RX, DE). The hardware 2-level stack simplifies the deterministic keypad scanner - one level for the main loop, one level for the UART byte handler.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C55-HS/P — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC16C54-HS/P | PIC16C56-HS/P | PIC16C55A-20I/P | PIC16C55-10/SO | PIC16F54-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-PDIP | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same (SOIC body on -10/SO variant) | 28-PDIP - same |
| Program Memory | 768 B (512 x 12) OTP | 512 B (384 x 12) OTP | 1.5 KB (1k x 12) OTP | 768 B (512 x 12) OTP | 768 B (512 x 12) OTP | 512 B (384 x 12) Flash |
| Maximum Clock Frequency | 20 MHz (HS grade) | 20 MHz (HS grade) | 20 MHz (HS grade) | 20 MHz | 10 MHz | 20 MHz |
| Supply Voltage | 3.3 V to 5.5 V | 3.3 V to 5.5 V | 3.3 V to 5.5 V | 2.0 V to 6.25 V (wider window) | 3.3 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 20 | 20 | 20 | 20 | 20 | 20 |
| RAM | 24 B | 24 B | 24 B | 24 B | 24 B | 24 B |
| Program Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash (re-programmable, ICSP-capable) |
| ICSP Support | No | No | No | No | No | Yes |
| Lifecycle Status | Obsolete (per Microchip PIC16C5X EOL) | Obsolete | Obsolete | Obsolete | Obsolete | Active |
Bảo phân biệt quan trọng
- Highest-density baseline 5x OTP part with HS grade (vsPIC16C54-HS/P)
- Industry-standard PIC16C5X baseline core with deterministic 1-cycle instructions (vsPIC16C55A-20I/P)
- OTP EPROM enables lowest-cost production programming (vsPIC16F54-I/P)
- HS grade supports 20 MHz maximum clock (vsPIC16C55-10/SO)
Ghi chú thiết kế
PIC16C5X baseline parts do NOT support ICSP; you must program the OTP memory externally with an MPLAB PM3 (or older PICSTART Plus) device programmer BEFORE soldering or via test-points that expose VPP, RB6 (clock), RB7 (data), and MCLR. Production boards need a programming header or in-test programming fixture, otherwise unsoldered parts cannot be reworked. Design PCBs to bring MCLR, RB6, RB7, VDD and VSS to accessible test points.
VDD decoupling: place a 100 nF ceramic capacitor as close as possible to the VDD pin (pin 20 on 28-PDIP) with a short trace to the VSS pin (pin 19). For boards with high-noise relay drivers, add a bulk 10 uF tantalum or aluminum electrolytic cap on the VDD rail. The PIC16C5X does not have an internal voltage regulator, so VDD noise directly couples into the oscillator; poor decoupling causes intermittent HS-mode start-up failures at cold temperature.
Oscillator layout: keep the HS-grade crystal (or ceramic resonator) and its loading capacitors within 5 mm of OSC1/OSC2 (pins 20/21). Guard the oscillator traces with a ground pour and avoid running digital signals under the crystal. For 20 MHz HS operation, the oscillator is sensitive to stray capacitance beyond ~20 pF; long traces or proximity to I/O toggling lines will detune the resonator. Series resistor (Rs ~100 ohm) may be required for AT-cut crystals to prevent overdrive.
I/O current derating: each I/O pin can source or sink 25 mA DC, but the absolute maximum for the entire PORTA is 100 mA and for PORTB is 100 mA, with a per-package limit of 200 mA. Driving 8 LEDs at 20 mA continuously (160 mA total) approaches the PORTB limit; if your design uses parallel LED arrays, switch to a driver IC (ULN2003, TPIC6B595) rather than sourcing from the MCU directly. Verify worst-case sink current with all LEDs on simultaneously.
Estimated: at 20 MHz clock, 5.0 V VDD and all CMOS inputs at VDD, the PIC16C55-HS/P Icc is typically 10 mA (50 mW). At max commercial temperature +70 C, power dissipation is well within the 28-PDIP package rating (1 W thermal, theta-JA ~50 C/W); no heatsink is required. Sleep mode reduces Icc to under 5 uA for battery-friendly idle. If your design uses HS-grade operation at extended temperature, derate clock frequency above +70 C per the family derating curve.
Thông tin tuân thủ
PIC16C5X is a long-discontinued family; specific lot/date-code RoHS and lead-free status varies. Modern production parts from Microchip are RoHS compliant per Microchip product-page statement, but pre-discontinued lots may be non-RoHS. Always check the date code and lot with your distributor before committing to a RoHS-critical BOM.
