PIC16C55T-XT/SO - 8-bit OTP MCU, 768B EPROM, 20 I/O SOIC-28 | Microchip
MPN: PIC16C55T-XT/SO ✗ Cuối đờiPIC16C55T-XT/SO Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and peripheral I/O. Within the product hierarchy, the PIC16C5X belongs to the 8-bit MCU -> microcontroller -> embedded controller -> semiconductor family. The PIC16C5X series in particular is Microchip's original "baseline" OTP/EPROM-based MCU architecture, designed for cost-sensitive, low-to-medium complexity embedded applications where flash reprogrammability is not required, making it well-suited for high-volume consumer and industrial products.
Key features include Harvard-architecture separate program and data buses, a 12-bit instruction word, a 2-level hardware stack, an 8-bit timer/counter with optional programmable prescaler, power-on reset, watchdog timer with on-chip RC oscillator, code-protection EPROM security, and CMOS technology for very low power consumption (typically < 2 mA at 5 V/4 MHz and < 20 uA in standby). The 20-mA sink/source per-pin capability (max 25 mA per pin) on the 20 I/O pins directly drives LEDs and small relays.
Typical applications include remote-control transmitters, security-system sensor interfaces, appliance controllers (microwave, washing machine, thermostat), consumer-electronics toys, simple battery chargers, smoke detectors, automotive interior accessories (non-safety), and any high-volume appliance where the OTP memory's one-time-programmable cost advantage outweighs the need for in-system reprogramming. The wide SOIC-28 footprint simplifies hand-soldering and rework compared to shrink-SOIC packages.
When designing with this part, verify that the OTP program memory will be burned before PCB assembly - field updates are not possible. Ensure the VDD rise time stays below the POR-specification ramp; if a slow-rising supply is unavoidable, use a power-on-reset supervisor. Decouple VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the pin, and connect the OSC1/OSC2 crystal traces in short, ground-guarded paths.
Bộ thay thế dễ dàng lắp đặt cho PIC16C55T-XT/SO — 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 PIC16C55T-XT/SO (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, RoHS Status, Timers, Mounting Type.
PIC16C55T-RC/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55T-LPI/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55T-HS/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55T-HSE/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-RCI/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55-HS/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C55AT-40/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C55T-XT/SO Tỷ lệ tối đa & tính chất điện
| Program Memory Type | EPROM (OTP) |
| Program Memory Size | 768 bytes (0.75 KB) |
| Data RAM | 24 bytes |
| CPU Architecture | 8-bit RISC (PIC16C5X baseline) |
| Instruction Word Width | 12 bits |
| Instruction Set Size | 33 single-word instructions |
| Maximum CPU Frequency | 4 MHz (XT oscillator) |
| Supply Voltage (VDD) | 2.5 V to 6.25 V |
| I/O Pins | 20 (Ports RA, RB, RC) |
| Timers | 1 x 8-bit Timer/Counter0 with prescaler |
| Watchdog Timer | Yes (on-chip RC oscillator) |
| Power-on Reset | Yes |
| Stack Depth | 2-level hardware |
| I/O Sink/Source Current | 20 mA per pin (max 25 mA) |
| Nhiệt độ hoạt động | 0 C to +70 C (commercial) |
| Hộp | SOIC-28 (300 mil, wide-body) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Non-Compliant (contains Pb, Sn/Pb finish) |
| Packaging Code | T = Tape and Reel |
Cấu hình chân PIC16C55T-XT/SO
| Chân 1 | RA2 — Bidirectional I/O pin, Port A bit 2 |
| Chân 2 | RA3 — Bidirectional I/O pin, Port A bit 3 |
| Chân 3 | RA4/T0CKI — Bidirectional I/O pin, alt: Timer0 clock input |
| Chân 4 | MCLR — Master Clear (Reset) input, active low |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0/INT — Bidirectional I/O pin, alt: External interrupt input |
| Chân 7 | RB1 — Bidirectional I/O pin, Port B bit 1 |
| Chân 8 | RB2 — Bidirectional I/O pin, Port B bit 2 |
| Chân 9 | RB3 — Bidirectional I/O pin, Port B bit 3 |
| Chân 10 | RB4 — Bidirectional I/O pin, Port B bit 4 |
| Chân 11 | RB5 — Bidirectional I/O pin, Port B bit 5 |
| Chân 12 | RB6 — Bidirectional I/O pin, Port B bit 6 |
| Chân 13 | RB7 — Bidirectional I/O pin, Port B bit 7 |
| Chân 14 | VSS — Ground reference (secondary) |
| Chân 15 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Chân 16 | OSC2/CLKOUT — Oscillator crystal output / clock out (XT mode) |
| Chân 17 | RC0 — Bidirectional I/O pin, Port C bit 0 |
| Chân 18 | RC1 — Bidirectional I/O pin, Port C bit 1 |
| Chân 19 | RC2 — Bidirectional I/O pin, Port C bit 2 |
| Chân 20 | RC3 — Bidirectional I/O pin, Port C bit 3 |
| Chân 21 | RC4 — Bidirectional I/O pin, Port C bit 4 |
| Chân 22 | RC5 — Bidirectional I/O pin, Port C bit 5 |
| Chân 23 | RC6 — Bidirectional I/O pin, Port C bit 6 |
| Chân 24 | RC7 — Bidirectional I/O pin, Port C bit 7 |
| Chân 25 | RA0 — Bidirectional I/O pin, Port A bit 0 |
| Chân 26 | RA1 — Bidirectional I/O pin, Port A bit 1 |
| Chân 27 | VDD — Positive supply voltage (2.5 V to 6.25 V) |
| Chân 28 | VDD — Positive supply voltage (secondary, both VDD pins tied) |
Ứng dụng tiêu biểu
PIC16C55T-XT/SO phù hợp cho 7 Áp dụngs: Remote Control Transmitters, Home Appliance Controllers, Security System Sensor Nodes, Automotive Interior Accessories, Consumer Electronics Toys, Smart Battery Chargers (Lead-Acid / NiMH), Industrial Sensor / Counter Modules.
Remote Control Transmitters
The PIC16C55T-XT/SO is well-suited for IR/RF remote-control transmitters in consumer electronics: its 20 mA per-pin sink/source capability directly drives IR LEDs without driver transistors, its 4 MHz XT oscillator is fast enough for 38 kHz / 40 kHz carrier modulation, and its 0.75 KB EPROM easily fits single-button to 32-button keypad scanning firmware. Typical draw of < 2 mA active at 5 V extends coin-cell battery life. Place the part in SOIC-28 with a 0.1 uF decoupling cap within 5 mm of VDD; drive the IR LED directly from an RB pin.
Được đề xuất
Home Appliance Controllers
In microwave ovens, washing machines, dishwashers, and toaster ovens, the PIC16C55T-XT/SO integrates the entire control function: 20 I/O pins scan keypads, drive 7-segment LED displays, sense temperature/humidity via ADC-free comparators, and switch triac-driver outputs. The OTP EPROM keeps unit cost low for high-volume SKUs. Total BOM cost is minimized because no external program-memory IC is needed. Watchdog timer guards against mains-burst ESD events; the SOIC-28 wide-body footprint eases field repair.
Được đề xuất
Security System Sensor Nodes
For PIR motion, door/window contact, and smoke-detector sensor nodes, the PIC16C55T-XT/SO delivers low standby current (< 20 uA at 5 V) so battery life exceeds 2 years, plus enough program memory for custom tamper-detection and low-battery-warning logic. Its hardware watchdog prevents lockup in long-unattended installations, and the SOIC-28 wide-body is robust enough for industrial temperature swings. Pair with an RF transceiver IC for wireless alarm panels or with a piezo buzzer for local sirens.
Được đề xuất
Automotive Interior Accessories
For non-safety automotive accessories such as interior LED mood lighting, seat heaters, and auxiliary fan controllers, the PIC16C55T-XT/SO provides 20 mA I/O to drive MOSFET gates and LED strings directly, plus 768 bytes for PWM and soft-start firmware. Its commercial 0 C to +70 C rating covers cabin environments; the SOIC-28 footprint survives vibration better than QFN alternatives. Migrate to AEC-Q100 qualified PIC16F equivalents (e.g. PIC16F1825-I/SO) for under-hood or safety-related applications.
Được đề xuất
Consumer Electronics Toys
The PIC16C55T-XT/SO is a cost-optimized MCU for talking dolls, electronic learning toys, simple handheld games, and musical greeting cards: its sub-$1.50 qty-1 price (as of 2026-09-16) keeps toy BOM costs competitive, its 20 I/O pins handle button matrices and small LCD/LED displays, and its 4 MHz instruction rate supports simple sound synthesis via bit-banged PWM. The EPROM OTP model protects against unauthorized firmware cloning, which matters for branded character licenses.
Được đề xuất
Smart Battery Chargers (Lead-Acid / NiMH)
For single-cell or multi-cell NiMH / lead-acid chargers in the 1 A to 5 A range, the PIC16C55T-XT/SO implements CC/CV charge profiles in firmware, drives MOSFET pass elements or relay outputs via its 20-mA-rated I/O, and monitors voltage dividers on its digital I/O with simple comparator thresholds. The 4 MHz XT oscillator provides sufficient timing resolution for delta-V peak detection, and the OTP EPROM prevents reverse-engineering of proprietary charge algorithms.
Được đề xuất
Industrial Sensor / Counter Modules
In factory-floor pulse counters, rotation sensors, and simple PLC-I/O expansion boards, the PIC16C55T-XT/SO offers 20 isolated digital inputs via its 20 I/O pins, an 8-bit hardware timer for frequency/event counting, and watchdog-timer robustness against electrical transients. SOIC-28 footprint supports through-hole reflow with hand-soldering fallback for low-volume SKUs. The EPROM OTP nature prevents IP leakage of proprietary counting protocols.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C55T-XT/SO — 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 | PIC16C55T-RC/SO | PIC16C55T-LPI/SO | PIC16C55T-HS/SO | PIC16C55-RCI/SO | PIC16C55AT-40/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-28 (wide-body 300 mil) | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same | SOIC-28 - same |
| Program Memory | 768 B OTP EPROM | 768 B OTP EPROM | 768 B OTP EPROM | 768 B OTP EPROM | 768 B OTP EPROM | 768 B OTP EPROM (PIC16C55A silicon) |
| Max CPU Frequency | 4 MHz (XT oscillator) | 4 MHz (RC oscillator) | 200 kHz (LP oscillator) | 20 MHz (HS oscillator) | 4 MHz (RC, industrial temp) | 40 MHz equivalent |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C |
| Supply Voltage | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V |
| I/O Pins | 20 | 20 | 20 | 20 | 20 | 20 |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
| Unit Price (qty-1) | $1.54 | ~$1.54 | ~$1.54 | ~$1.54 | ~$1.54 | ~$1.54 |
Bảo phân biệt quan trọng
- Cost-optimized 8-bit baseline MCU with 0.75 KB OTP EPROM (vsPIC16F55-I/SO (flash-based))
- Wide-body SOIC-28 package simplifies hand-soldering and rework (vsQFN-packaged PIC16F series equivalents)
- 20 mA I/O sink/source drives LEDs without external transistors (vsMost modern 8-bit MCUs (typically 5-10 mA per pin))
Ghi chú thiết kế
PIC16C55T-XT/SO supply voltage (VDD) range is 2.5 V to 6.25 V. Place a 0.1 uF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 27 and 28) to suppress high-frequency switching noise from the internal CPU. If the application draws large transient loads on the same supply (e.g., a relay or buzzer), add a 10 uF bulk capacitor. Tie both VDD pins together on the PCB and both VSS pins together. Do not allow VDD rise time to exceed the POR threshold, or use a discrete POR supervisor.
SOIC-28 wide-body (300-mil) footprint requires minimum pad pitch of 1.27 mm (50 mil) and pad width of 0.6 mm. Route OSC1 (pin 15) and OSC2 (pin 16) traces as short as possible, ground-guarded, and keep them away from high-current switching traces to avoid oscillator instability. The MCLR pin (pin 4) should have a 10 kohm pull-up resistor to VDD and a 100 nF cap to ground for hardware-reset debouncing.
Because this is OTP EPROM, firmware cannot be field-updated. All firmware must be fully validated and burned before PCB assembly; budget extra time and samples for OTP-only prototyping. Watchdog timer must be enabled and cleared by firmware, or it will reset the device every ~18 ms (typical WDT period with on-chip RC). I/O pin current limit is 20 mA continuous / 25 mA peak - do not exceed this when driving LEDs, or use a transistor driver.
SOIC-28 wide-body package thermal resistance is approximately 80 C/W (theta_JA on a 1-oz 4-layer JEDEC test board). At 4 mA active current and 5 V supply, dissipation is only 20 mW, so junction temperature rise is negligible (< 1.6 C above ambient). No heatsink is required for typical embedded-controller applications. Estimated: P = VDD x IDD_active = 5 V x 4 mA = 20 mW; TJ_rise = 20 mW x 80 C/W = 1.6 C.
Thông tin tuân thủ
PIC16C55T-XT/SO uses Sn/Pb (tin-lead) lead finish to maintain soldering compatibility with the EPROM-based process flow, hence non-RoHS-compliant. Reach is compliant per Microchip product statement. Not AEC-Q100 qualified - not intended for automotive under-hood or safety applications.
