PIC16C621-20I/P - 8-Bit OTP MCU 1.75KB 20MHz 18-DIP | Microchip
MPN: PIC16C621-20I/P ✗ اختتامِ زندگیPIC16C621-20I/P جائزہ
A PIC16C-series microcontroller is an 8-bit RISC Harvard-architecture MCU built on Microchip's OTP EPROM/ROM CMOS process. Within the broader taxonomy, it sits at the bottom of the PIC12/PIC16/PIC18 hierarchy, designed for cost-sensitive embedded control tasks that need more I/O than a PIC12 can offer but do not require the peripheral richness of a PIC18. Compared with PIC16F flash variants, the PIC16C OTP line is intended for mature, stable production designs where firmware is finalized and code-protection is desirable.
Key features of this part include a wide 2.5V to 6.0V operating voltage range, fully static design (clock from DC up to 20 MHz), 15 uA typical current at 5V/4 MHz and 1 uA typical at 3V/32 kHz for low-power sleep operation, an external oscillator interface, and 13 bidirectional digital I/O pins with programmable direction. Industrial temperature grade (-40C to +85C) makes it suitable for harsh-environment deployments.
The PIC16C621 uses a 14-bit instruction word with a RISC-like instruction set optimized for compact code density and deterministic interrupt response. Peripherals on this die include a core timer/counter, watchdog timer, and brown-out reset depending on silicon revision. The 20 MHz top speed at 5V gives 5 MIPS of throughput, which is sufficient for simple control loops, user-interface scanning, and protocol bridging.
Typical applications for the PIC16C621-20I/P include consumer appliance control, security and access-control panels, lighting controllers, low-end sensor signal-conditioning front ends, and replacement designs for legacy through-hole PIC16C production lines. Its 18-DIP footprint and industrial temperature grade specifically suit through-hole industrial boards and retrofit designs.
A key design consideration for OTP PIC16C parts is that firmware can only be programmed once and cannot be updated in-circuit. Designers should finalize firmware revision before committing to the C-series, or move to the PIC16F flash equivalent (e.g. PIC16F684-I/P) if field-upgrade capability is mandatory. The 18-DIP footprint remains compatible with PIC16F684-I/P, easing migration when OTP stock is exhausted.
This page synthesizes distributor pricing, drop-in alternatives, application guidance, and practical design notes that are not bundled in the manufacturer datasheet, helping engineers select, source, and design with the PIC16C621-20I/P efficiently.
کے لیے ڈراپ اِن متبادل PIC16C621-20I/P — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں PIC16C621-20I/P (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Core Architecture, Program Memory Size, RAM Size, Program Memory Type.
PIC16C621A-20I/P
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC16C621-20/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C621-04I/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C621-20E/SS
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C620A-20I/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F684-I/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F628A-I/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C621-20I/P زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core Architecture | 8-bit RISC (PIC16C family, 14-bit instruction word) |
| Program Memory Type | OTP EPROM (One-Time-Programmable) |
| Program Memory Size | 1.75 KB (1K x 14) |
| RAM Size | 80 bytes (80 x 8) |
| EEPROM | None |
| Maximum CPU Frequency | 20 MHz |
| Operating Voltage Range | 2.5 V to 6.0 V |
| Number of I/O Pins | 13 |
| Number of Timers | 1 (TMR0) |
| Oscillator Type | External |
| Brown-out Reset | Yes |
| Watchdog Timer | Yes |
| پیکیج | 18-DIP (0.300 inch / 7.62 mm pitch) |
| ماؤنٹنگ ٹائپ | Through-Hole |
| آپریٹنگ درجہ حرارت رینج | -40 C to +85 C (Industrial grade) |
| Typical Current at 5V/4 MHz | 15 uA |
| Typical Current at 3V/32 kHz | 1 uA |
| پن کی تعداد | 18 |
| Packaging | Tube |
| Lead Free / RoHS | Lead-free process, RoHS status per lot - verify with distributor |
PIC16C621-20I/P پن کنفیگریشن
| پن 1 | MCLR/Vpp — Master clear reset (active low) / programming voltage input |
| پن 2 | RA0/AN0 — Port A bit 0 / analog comparator input 0 |
| پن 3 | RA1/AN1 — Port A bit 1 / analog comparator input 1 |
| پن 4 | RA2/AN2 — Port A bit 2 / analog comparator output |
| پن 5 | RA3/AN3 — Port A bit 3 / analog comparator input 3 |
| پن 6 | RA4/T0CKI — Port A bit 4 / Timer0 clock input (open-drain output) |
| پن 7 | RB0/INT — Port B bit 0 / external interrupt input |
| پن 8 | RB1 — Port B bit 1 |
| پن 9 | RB2 — Port B bit 2 |
| پن 10 | RB3 — Port B bit 3 |
| پن 11 | RB4 — Port B bit 4 |
| پن 12 | RB5 — Port B bit 5 |
| پن 13 | RB6 — Port B bit 6 |
| پن 14 | RB7 — Port B bit 7 |
| پن 15 | Vss — Ground |
| پن 16 | VDD — Positive supply voltage (2.5V to 6.0V) |
| پن 17 | OSC2/CLKOUT — Oscillator output / clock output |
| پن 18 | OSC1/CLKIN — Oscillator input / external clock input |
عام استعمالات
PIC16C621-20I/P کے لیے موزوں ہے 6 ایپلیکیشنs: Security and Access Control Panels, Consumer Appliance Control Boards, Lighting Controllers and Dimmers, Sensor Signal-Conditioning Front Ends, Automotive Aftermarket Electronics, Industrial Control and Legacy Replacement.
Security and Access Control Panels
The PIC16C621-20I/P suits keypad entry controllers, magnetic-card readers, and PIR sensor interfaces thanks to its 13 I/O lines that directly scan 4x4 matrices, drive relay coils, and read digital sensors without external logic. With 1.75KB OTP it can host the full keypad-decode, debounce, and lock-actuation state machine while the 20MHz clock gives 5MIPS of deterministic interrupt response. Industrial temperature grade (-40C to +85C) survives unheated vestibules and outdoor junction boxes. Estimated: with code size typically 700-1200 instructions, the 1024-word OTP has 10-30% headroom for protocol additions like Wiegand output or EEPROM emulation on the I/O pins.
تجویز کردہ
Consumer Appliance Control Boards
The PIC16C621-20I/P drives washing-machine control boards, microwave keypads, dishwasher user interfaces, and HVAC zone controllers because its 13 I/O can directly multiplex 7-segment displays and triac-fire outputs while the 20MHz clock services zero-crossing interrupts in real time. The 80-byte RAM holds running timers, mode flags, and button-debounce counters without overflow. Its industrial temperature grade tolerates the heat soak inside an appliance chassis. The PIC16C6x instruction set is optimized for bit-banging, so a single I/O line can generate the precise pulse trains needed for IR remote, triac phase-angle control, or tone generation.
تجویز کردہ
Lighting Controllers and Dimmers
The PIC16C621-20I/P is well-suited to DMX512 lighting fixtures, architectural dimmer packs, and LED driver controllers because its 13 I/O can decode a single DMX universe (8 channels per port) and drive 0-10V analog outputs via PWM-filtered I/O. The 20MHz clock performs accurate phase-angle triac dimming at 50/60Hz with sub-microsecond jitter. The comparator input can monitor zero-crossing directly for synchronous triac firing. The 80-byte RAM keeps running scene states for 8-16 lighting zones without external storage. Industrial temperature grade handles ceiling-fixture heat-rise during continuous LED driver operation.
تجویز کردہ
Sensor Signal-Conditioning Front Ends
The PIC16C621-20I/P serves as a smart sensor front-end for thermocouples, RTDs, thermistors, and 4-20mA loops where the on-chip comparator and 13 I/O can digitize analog signals via slope/dual-slope conversion before serializing data on an I/O pin. The 20MHz clock converts analog readings at >1kHz rates while maintaining 14-bit effective resolution through oversampling. The wide 2.5-6.0V supply range accepts 3.3V or 5V sensor rails directly. Estimated: a typical RTD signal chain running 10 conversions per second consumes under 1mA active and 5uA standby, well within the PIC16C621 power budget.
تجویز کردہ
Automotive Aftermarket Electronics
The PIC16C621-20I/P is used in aftermarket automotive modules such as alarm systems, remote-start controllers, and gauge-cluster retrofits because its industrial -40C to +85C temperature range covers under-dash environments and its 13 I/O drive relay drivers, LED indicators, and ignition-switch inputs. The 20MHz instruction cycle services debounced switch inputs in real time. The OTP memory prevents field-tampering of alarm codes. Where AEC-Q100 automotive qualification is required, designers should migrate to PIC16F684-I/P or PIC16F628A-I/P since the C-series is not AEC-Q qualified despite its industrial temperature grade.
تجویز کردہ
Industrial Control and Legacy Replacement
The PIC16C621-20I/P is used to maintain legacy industrial controllers, PLC I/O modules, and SCADA remote-terminal units (RTUs) that were originally designed around the PIC16C6x family and where firmware is locked-in OTP for tamper resistance. Its 13 I/O can replace discontinued discrete-logic glue, its 20MHz clock handles Modbus RTU frame timing, and its 18-DIP through-hole form factor is repairable in the field with standard sockets. Industrial temperature grade matches factory-floor and outdoor-cabinet conditions. Replacement and migration to PIC16F628A-I/P or PIC16F684-I/P is recommended for new designs.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC16C621-20I/P — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | PIC16C621A-20I/P | PIC16C621-20/P | PIC16C621-04I/P | PIC16F684-I/P | PIC16F628A-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-DIP | 18-DIP - same | 18-DIP - same | 18-DIP - same | 18-DIP - same | 18-DIP - same |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 2 KB Flash | 3.5 KB Flash |
| RAM | 80 B | 80 B | 80 B | 80 B | 256 B | 224 B |
| I/O Pins | 13 | 13 | 13 | 13 | 12 | 16 |
| Max Clock | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 20 MHz | 20 MHz |
| Program Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash | Flash |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
اہم امتیازی خصوصیات
- Pin-compatible silicon-updated alternative available (بمقابلہPIC16C621A-20I/P)
- Flash migration target available in same footprint (بمقابلہPIC16F684-I/P)
- Industrial temperature range and 20MHz throughput (بمقابلہPIC16C621-04I/P)
ڈیزائن نوٹس
PIC16C621-20I/P uses One-Time-Programmable EPROM - firmware cannot be erased or rewritten after programming. Verify firmware revision and timing margins exhaustively before committing to OTP. For field-updatable designs, migrate to PIC16F684-I/P or PIC16F628A-I/P. Estimated: design cycle should include at least 3 firmware-rebuild rounds on a windowed/UV-erasable PIC16C621JW before locking the OTP mask.
Power the PIC16C621-20I/P from a regulated 5.0V +/- 5% supply. Brown-out reset is enabled in the configuration word by default; configure BOR voltage threshold below Vdd_min to avoid unintended reset. Decoupling: place a 100 nF ceramic between Vdd (pin 16) and Vss (pin 15) within 5 mm of the pins. For low-power sleep applications, gate the external oscillator off via a load-switch since current draw drops to ~1 uA at 32 kHz.
MCLR (pin 1) requires a 10 kohm pull-up to Vdd and a 100 nF cap-to-ground for noise immunity - directly tying MCLR to Vdd risks spurious resets from EMI. Route the external oscillator traces (OSC1/OSC2, pins 17/18) short and adjacent to ground; place the crystal or resonator within 10 mm of the pins. Keep high-current switching traces (relay coils, triacs) at least 25 mm away from the OSC traces to avoid clock jitter.
The PIC16C621-20I/P is not 5V-tolerant on I/O when powered at 3.3V - driving a 5V input into a 3.3V-powered PIC will forward-bias the ESD clamp and may damage the device. For 5V-tolerant I/O at 3.3V supply, migrate to PIC16F684-I/P which has Schmitt-trigger inputs with input-clamp diodes. For comparator inputs AN0/AN1 (pins 2/3), add a 100 ohm series resistor to limit input current during fault conditions.
