PIC16C554T-20/SS - 8-Bit OTP MCU, 20MHz, 896B | Microchip
MPN: PIC16C554T-20/SS ✓ Hoạt độngPIC16C554T-20/SS Tóm tắt
An OTP microcontroller is a variation of the PIC16C5x baseline architecture in which the program memory is implemented as one-time-programmable EPROM rather than UV-erasable EPROM. This category, broadly termed microcontroller (MCU) or embedded controller, sits in the silicon hierarchy as: MCU -> embedded controller -> microprocessor -> semiconductor IC. OTP MCUs target cost-sensitive, high-volume, factory-programmed applications where field re-programming is not required, so they trade re-programmability for lower unit cost and simpler firmware logistics.
Key features include 35 single-word instructions, 200 ns instruction execution time at 20 MHz, a hardware watchdog timer, power-on reset, and an operating voltage range of 3.0V to 5.5V. The 20-pin SSOP footprint (5.30 mm body width, 0.65 mm pitch) suits space-constrained boards, and the part supports a commercial temperature grade (0C to +70C) in this -20 speed variant.
Architecturally the device is built around the classic PIC14-bit instruction word, single-accumulator Harvard structure with separate program and data buses, allowing simultaneous instruction fetch and operand access. The 12-bit wide PC supports a 2K-word program address space, of which 512 words (896 bytes) are realized on this die. The I/O structure uses bidirectional TTL/CMOS-compatible ports with programmable weak pull-ups.
Typical applications include appliance controls, sensor front-ends, low-cost battery chargers, simple LED drivers, smoke detectors, and white-goods user-interface panels. Because the part is OTP, it is suited to mature, locked-down firmware that will not require field updates.
When designing with the PIC16C554T-20/SS, ensure the in-circuit serial programming (ICSP) interface is reserved on the board even in production layouts - it remains the only way to program the OTP array before conformal coating or potting, and the same two pins can be reused for in-test boundary scan. Note that the -20 suffix denotes 20 MHz maximum clock; for lower-power designs a -04 (4 MHz) speed grade is also available.
This page synthesizes distributor availability, parametric alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers verify supply, compare pin-compatible substitutes, and lock in long-term component strategy as of 2026-09-16.
Bộ thay thế dễ dàng lắp đặt cho PIC16C554T-20/SS — 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 PIC16C554T-20/SS (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, Program Memory Type, Timers, Operating Temperature.
PIC16C554T-04/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C554-20I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C554T-04I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C554T-04E/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C554T-20/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C554-04I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C554T-20/SS Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 896 B (512 x 14 bit) |
| RAM Size | 80 B |
| Tần số xung maksimum | 20 MHz |
| Instruction Execution Time | 200 ns @ 20 MHz |
| Instruction Set Size | 35 single-word instructions |
| Number of I/O Pins | 13 |
| Operating Voltage Range | 3.0 V to 5.5 V |
| Supply Voltage (Typical) | 5 V |
| Khoảng nhiệt độ hoạt động | 0C to +70C (Commercial) |
| Hộp | 20-SSOP (5.30 mm body, 0.65 mm pitch) |
| Kiểu lắp đặt | Surface Mount |
| Bề rộng đường dữ liệu | 8-bit |
| Watchdog Timer | Yes (hardware) |
| Power-On Reset | Yes |
| Trạng thái RoHS | Compliant |
| Speed Grade Suffix | -20 (20 MHz) |
Cấu hình chân PIC16C554T-20/SS
| Chân 1 | RA2 — Bidirectional I/O port A bit 2 |
| Chân 2 | RA3 — Bidirectional I/O port A bit 3 |
| Chân 3 | RA4/RTCC — I/O port A bit 4 / RTCC timer input |
| Chân 4 | MCLR — Master clear reset input (active low) |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0/INT — I/O port B bit 0 / external interrupt |
| Chân 7 | RB1 — Bidirectional I/O port B bit 1 |
| Chân 8 | RB2 — Bidirectional I/O port B bit 2 |
| Chân 9 | RB3 — Bidirectional I/O port B bit 3 |
| Chân 10 | RB4 — Bidirectional I/O port B bit 4 |
| Chân 11 | RB5 — Bidirectional I/O port B bit 5 |
| Chân 12 | RB6 — Bidirectional I/O port B bit 6 |
| Chân 13 | RB7 — Bidirectional I/O port B bit 7 |
| Chân 14 | VSS — Ground reference (second) |
| Chân 15 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Chân 16 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Chân 17 | RA0 — Bidirectional I/O port A bit 0 |
| Chân 18 | RA1 — Bidirectional I/O port A bit 1 |
| Chân 19 | VSS — Ground reference (third) |
| Chân 20 | VDD — Positive supply voltage |
Ứng dụng tiêu biểu
PIC16C554T-20/SS phù hợp cho 6 Áp dụngs: Appliance Control Board, Smoke Detector Controller, Battery Charger Front-End, LED Lighting Controller, Industrial Sensor Front-End, White-Goods User Interface Panel.
Appliance Control Board
The PIC16C554T-20/SS fits appliance controls such as washing-machine lid locks, dishwasher cycle timers, and microwave user-interface panels. Its 896 B OTP program memory holds a small state-machine firmware, the 13 I/O pins drive relay coils, LEDs, and keypads directly, and the 20 MHz clock handles 200 ns instruction cycles for responsive button-debounce logic. Operating from 3.0-5.5 V it integrates with 5 V relay-driver rails, and the SSOP-20 footprint saves board area versus SOIC-20 alternatives. The OTP memory locks the firmware at production, preventing end-user code tampering.
Được đề xuất
Smoke Detector Controller
Smoke and CO detector designs use the PIC16C554T-20/SS as the central MCU because its 80 B RAM and 896 B OTP comfortably store the sensor-sampling loop, low-battery alarm thresholds, and hush-mode state machine. The 20 MHz instruction rate samples the ionization or photoelectric chamber every 10 ms, fast enough to catch smoke transients. The hardware watchdog timer and power-on reset ensure the detector recovers from brown-outs during battery swap. Operating at 3.0 V it matches 2x AA alkaline supplies, and the SSOP-20 fits inside a 4-inch detector housing with margin.
Được đề xuất
Battery Charger Front-End
Low-end NiMH and lead-acid charger designs use the PIC16C554T-20/SS to manage charge profile, temperature foldback, and LED status indication. The MCU's 13 I/O drive charge FETs, current-sense amplifiers, and tri-color status LEDs directly, while the 35-instruction PIC16C5x baseline keeps the firmware short enough to fit in 896 B OTP. The 20 MHz clock supports 8-bit PWM at 78 kHz for smooth current control. The 3.0-5.5 V supply range accepts both 5 V USB and 12 V wall-adapter inputs via a small LDO, simplifying the BOM.
Được đề xuất
LED Lighting Controller
LED strip drivers and decorative lighting modules use the PIC16C554T-20/SS to run chase patterns, color-temperature blending, and DMX-512 lite protocols. The 20 MHz clock generates 8-bit PWM at up to 78 kHz, far above the 100 Hz flicker threshold, while 80 B RAM holds a frame buffer of RGB triplets. The 13 I/O drive constant-current LED drivers directly, and the SSOP-20 footprint fits a 1-inch controller PCB inside an aluminum extrusion. The OTP memory locks the firmware, preventing field tampering of safety-critical lighting firmware.
Được đề xuất
Industrial Sensor Front-End
Industrial proximity, level, and flow sensors use the PIC16C554T-20/SS as a smart sensor interface. The 20 MHz core runs calibration math in microseconds, the 10-bit ADC-equivalent on-chip comparator digitizes sensor signals, and 13 I/O drive RS-485 transceivers or 4-20 mA current loops. The commercial temp grade 0C to +70C suits factory-floor enclosures, and the SSOP-20 packages fit inside standard M12 sensor heads. OTP memory locks calibration coefficients, preventing field drift of factory-tuned offsets.
Được đề xuất
White-Goods User Interface Panel
Refrigerator, oven, and dishwasher user-interface panels use the PIC16C554T-20/SS to scan keypads, drive 7-segment or TFT displays, and handle capacitive-touch button decoding. The 35-instruction PIC16C5x baseline fits the UI firmware in 896 B OTP, while 80 B RAM holds display buffers and debounce state. The 20 MHz clock refreshes 7-segment displays at 100 Hz without flicker, and 13 I/O drive LED backlights, piezo buzzers, and rotary encoders directly. The SSOP-20 footprint fits a 30 mm x 60 mm control PCB inside the appliance housing.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C554T-20/SS — 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 | PIC16C554T-04/SS | PIC16C554-20I/SS | PIC16C554T-04I/SS | PIC16C554T-04E/SS |
|---|---|---|---|---|---|
| Package | 20-SSOP (5.30 mm body) | 20-SSOP (5.30 mm body) - same | 20-SSOP (5.30 mm body) - same | 20-SSOP (5.30 mm body) - same | 20-SSOP (5.30 mm body) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 20 MHz | 4 MHz | 20 MHz | 4 MHz | 4 MHz |
| Temperature Grade | Commercial 0C to +70C | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C |
| Program Memory | 896 B OTP | 896 B OTP | 896 B OTP | 896 B OTP | 896 B OTP |
| RAM Size | 80 B | 80 B | 80 B | 80 B | 80 B |
| Operating Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| I/O Pins | 13 | 13 | 13 | 13 | 13 |
| Instruction Set | 35 single-word | 35 single-word | 35 single-word | 35 single-word | 35 single-word |
| Packaging Format | Tape & Reel (-T) | Tape & Reel (-T) | Tube (no -T) | Tape & Reel (-T) | Tape & Reel (-T) |
Bảo phân biệt quan trọng
- Higher clock ceiling than -04 speed grade (vsPIC16C554T-04/SS)
- Commercial temp grade at lower cost than industrial variants (vsPIC16C554-20I/SS)
- Tape-and-reel packaging for high-volume SMT assembly (vsPIC16C554-04I/P)
Ghi chú thiết kế
The PIC16C554T-20/SS OTP memory cannot be re-programmed in-circuit. Ensure ICSP pins (RB6/RB7 for clock and data) are accessible on the production PCB even though they may be reassigned as I/O after programming. Trying to update field firmware requires either a Flash-based PIC16F54 successor or a socketed module - both add BOM cost. Recommended for fixed-function, factory-locked designs only.
Estimated: supply current for the PIC16C554T-20/SS is approximately 2-5 mA active at 5 V and 20 MHz, dropping to microampere range in sleep mode (when configured). Place a 100 nF decoupling capacitor within 5 mm of the VDD pin (pin 20) and a bulk 10 uF near the supply entry point. Multiple VSS pins (5, 14, 19) should all be tied to a low-impedance ground pour to avoid ground-bounce during I/O switching.
Route the 20 MHz crystal or resonator traces (OSC1 pin 16, OSC2 pin 15) as short as possible and keep them away from high-current switching traces. Place a guard ground trace around the oscillator loop if the board has switching power supply noise. The MCLR pin (pin 4) requires a 10 kohm pull-up to VDD; adding a 100 nF cap on MCLR slows reset rise time and improves noise immunity but extends the reset pulse width - choose the cap value to balance both.
Thông tin tuân thủ
RoHS and lead-free compliant per Microchip product page. Not AEC-Q100 qualified - select PIC16C554-20I/SS or -04I/SS for industrial-grade reliability.
