PIC16C55-XTE/SP - 8-Bit OTP MCU, 768B EPROM, 20 I/O, SPDIP-28
MPN: PIC16C55-XTE/SP ✗ اختتامِ زندگیPIC16C55-XTE/SP جائزہ
The PIC16C5X family represents the foundation of Microchip's mid-range 8-bit microcontroller legacy. A microcontroller (MCU) is a single-chip computer containing a CPU, RAM, non-volatile program memory, and peripheral I/O; 8-bit MCUs are used in cost-sensitive embedded applications where simple deterministic control is required. The PIC architecture uses a Harvard structure with separate program and data buses, 12-bit-wide instructions, and a fixed instruction cycle, delivering predictable 4:1 code density and deterministic interrupt latency that are valuable for low-power motor control, sensor signal conditioning, and legacy appliance designs.
Key features include a hardware 8-bit timer/counter (TMR0) with an 8-bit programmable prescaler, watchdog timer with dedicated on-chip RC oscillator, power-on reset, brown-out detection, and EPROM-based code storage. The device supports 33 single-word, single-cycle instructions with 2:1 code compression over comparable 8-bit MCUs of its era, and offers direct LED drive capability on all 20 I/O pins (sink/source up to 25 mA per pin). The fully static CMOS design eliminates minimum clock-rate constraints.
Typical applications include industrial control subsystems, automotive body electronics (non-safety-critical), appliance control boards, security panel keypads, and educational microcontroller training platforms. Because of its deterministic instruction timing and breadboard-friendly DIP package, the PIC16C55 family is widely used in university curricula and rapid prototyping environments. Modern replacements (PIC16F54, PIC16F57) provide flash memory but require software/firmware rewrites, as the OTP EPROM is not electrically re-programmable.
When designing with this OTP MCU, account for the one-time-programmable limitation: firmware revisions require re-masking or new silicon. Allocate 1-2 spare I/O pins for in-system test access, and ensure your oscillator circuit (ceramic resonator or crystal + 22 pF caps) matches the XT speed grade. The /MCLR reset pin must be tied to VDD through a 10 kohm pull-up for reliable operation. This part has been widely cloned and second-sourced, but Microchip originals remain the gold standard for longevity and documentation.
کے لیے ڈراپ اِن متبادل PIC16C55-XTE/SP — 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 PIC16C55-XTE/SP (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Timers, I/O Pins, Program Memory Type, RoHS Status.
PIC16C55-XTE/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C55-XT/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C55T-XT/SS
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C55A-20I/SP
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F54-I/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F57-I/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C55-XTE/SP زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Architecture | PIC16C5X 8-bit RISC (Harvard) |
| Instruction Set Width | 12-bit, 33 instructions |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 768 bytes (512 x 12 words) |
| Data RAM | 24 bytes |
| I/O Pins | 20 |
| زیادہ سے زیادہ کلاک فریکوئنسی | 4 MHz (XT grade) |
| Supply Voltage Range | 3.0 V to 6.25 V |
| آپریٹنگ درجہ حرارت رینج | -40 C to +125 C (Extended) |
| Timers | 1 x 8-bit TMR0 with prescaler |
| Watchdog Timer | Yes, dedicated on-chip RC oscillator |
| Reset Sources | POR, Brown-Out, /MCLR |
| I/O Sink/Source Current | 25 mA per pin (direct LED drive) |
| پیکیج | 28-pin SPDIP (Skinny DIP), Tube |
| Lead Pitch | 2.54 mm (0.100 in) |
| RoHS اسٹیٹس | Non-compliant (contains Pb in PDIP package) |
| Programming Method | Parallel programming via MPLAB PM3 / PRO MATE II |
PIC16C55-XTE/SP پن کنفیگریشن
| پن 1 | RA2 — Port A bit 2 (digital I/O) |
| پن 2 | RA3 — Port A bit 3 (digital I/O) |
| پن 3 | T0CKI — Timer0 clock input |
| پن 4 | /MCLR — Master Clear reset (active-low, tie to VDD via 10 kohm) |
| پن 5 | VSS — Ground reference |
| پن 6 | RB0 — Port B bit 0 (digital I/O, 25 mA) |
| پن 7 | RB1 — Port B bit 1 (digital I/O, 25 mA) |
| پن 8 | RB2 — Port B bit 2 (digital I/O, 25 mA) |
| پن 9 | RB3 — Port B bit 3 (digital I/O, 25 mA) |
| پن 10 | RB4 — Port B bit 4 (digital I/O, 25 mA) |
| پن 11 | RB5 — Port B bit 5 (digital I/O, 25 mA) |
| پن 12 | RB6 — Port B bit 6 (digital I/O, 25 mA) |
| پن 13 | RB7 — Port B bit 7 (digital I/O, 25 mA) |
| پن 14 | VSS — Ground reference (also VSS on this pin per datasheet) |
| پن 15 | OSC1 — Oscillator input (XT crystal or resonator) |
| پن 16 | OSC2 — Oscillator output (XT crystal or resonator) |
| پن 17 | RC0 — Port C bit 0 (digital I/O, 25 mA) |
| پن 18 | RC1 — Port C bit 1 (digital I/O, 25 mA) |
| پن 19 | RC2 — Port C bit 2 (digital I/O, 25 mA) |
| پن 20 | RC3 — Port C bit 3 (digital I/O, 25 mA) |
| پن 21 | RC4 — Port C bit 4 (digital I/O, 25 mA) |
| پن 22 | RC5 — Port C bit 5 (digital I/O, 25 mA) |
| پن 23 | RC6 — Port C bit 6 (digital I/O, 25 mA) |
| پن 24 | RC7 — Port C bit 7 (digital I/O, 25 mA) |
| پن 25 | RD0 — Port D bit 0 (digital I/O, 25 mA) |
| پن 26 | RD1 — Port D bit 1 (digital I/O, 25 mA) |
| پن 27 | RD2 — Port D bit 2 (digital I/O, 25 mA) |
| پن 28 | VDD — Positive supply (3.0 V to 6.25 V) |
عام استعمالات
PIC16C55-XTE/SP کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Control Subsystems, Appliance Control Boards, Security Panel Keypads, Automotive Body Electronics (Non-Safety), Educational Microcontroller Training, Sensor Signal Conditioning Front-Ends.
Industrial Control Subsystems
The PIC16C55-XTE/SP is well suited for industrial control subsystems such as conveyor belt sequencers, motor starter controllers, and sensor multiplexer boards. Its 20 digital I/O lines with 25 mA sink/source capability can directly drive relays, optocouplers, and status LEDs without external drivers, while the 8-bit TMR0 with prescaler handles pulse counting from incremental encoders or flow meters. The Extended -40C to +125C temperature range tolerates harsh factory floor environments, and the 768-byte OTP EPROM is adequate for fixed-function sequencing logic. For firmware-update flexibility, consider migrating to the PIC16F54-I/P, which uses the same 28-pin SPDIP footprint and PIC16C5X instruction set but offers flash reprogrammability for field-tunable sequencing parameters.
تجویز کردہ
Appliance Control Boards
The PIC16C55-XTE/SP is widely deployed in washing machine, dishwasher, microwave oven, and HVAC thermostat control boards where deterministic interrupt response and low BOM cost are priorities. The Harvard architecture executes each 12-bit instruction in a single 4-clock cycle, providing predictable timing for sensor sampling loops, while the Brown-Out Reset (BOR) protects against supply dips during compressor inrush. The 24 bytes of RAM suffice for keypad debounce, display multiplexing, and a small state machine. Because OTP EPROM is mask-programmed by Microchip at production, appliance OEMs benefit from low unit cost after NRE amortization. For new designs the flash-based PIC16F54-I/P is preferred, allowing firmware revisions via ICSP without re-masking.
تجویز کردہ
Security Panel Keypads
The PIC16C55-XTE/SP serves as the scan-controller in security alarm keypads, reading 4x4 matrix key inputs while driving LED indicators and piezo buzzer feedback. The 20 I/O pins accommodate up to 16 keys via matrix scanning with 8 wires, plus 4 LED status indicators and a buzzer driver, leaving pins for zone LED expansion. Watchdog timer prevents lockup if keypad scan logic stalls, and OTP EPROM prevents firmware reverse engineering - an anti-tamper benefit in security applications. The 4 MHz clock is more than adequate for debounced 50 ms key scanning. For designs requiring encrypted firmware, the PIC16F57-I/P offers flash with code protection, but the PIC16C55-XTE/SP remains preferred where cost dominates over reprogrammability.
تجویز کردہ
Automotive Body Electronics (Non-Safety)
The PIC16C55-XTE/SP appears in non-safety automotive body electronics such as HVAC blend door actuators, mirror position controllers, seat heater timers, and interior lighting dimmers. The Extended -40C to +125C temperature range is AEC-Q100-ish in spirit (though the part is not formally qualified), and the 25 mA I/O capability directly drives small relays and LED strings. Brown-Out Reset handles automotive load-dump voltage transients paired with an external TVS. OTP EPROM prevents warranty fraud via unauthorized firmware swaps. For new designs targeting formal AEC-Q100, the PIC16F54-I/P in industrial grade or higher-tier automotive PIC MCUs are recommended instead.
تجویز کردہ
Educational Microcontroller Training
The PIC16C55-XTE/SP is a classic teaching platform for university embedded systems courses due to its breadboard-friendly 28-pin SPDIP package, simple PIC16C5X architecture, and comprehensive documentation. Students learn RISC pipelining, fixed-cycle timing, and assembly programming using only 33 instructions - a manageable scope for first-time embedded learners. The 20 I/O pins interface directly with lab breadboard LEDs, switches, and 7-segment displays without level shifters. The MPLAB X IDE is free and the MPASM assembler handles PIC16C5X assembly. The PIC16F54-I/P has largely replaced it in curricula due to flash reprogrammability (students can iterate without UV erasure), but the PIC16C55-XTE/SP remains in legacy course materials.
تجویز کردہ
Sensor Signal Conditioning Front-Ends
The PIC16C55-XTE/SP acts as a low-cost sensor front-end for thermocouple cold-junction compensation, thermistor linearization, and ratiometric bridge excitation in weighing scales and process meters. Its deterministic 1 us instruction cycle at 4 MHz (4 clocks per cycle) enables precise software-implemented sigma-delta ADC using a single comparator pin and a reference resistor, achieving 12-16 effective bits at low sample rates. The Watchdog Timer recovers from software lockup during long integration cycles. OTP EPROM stores per-sensor calibration coefficients in production. Migrating to PIC16F57-I/P enables field recalibration via ICSP for weighing scale or pH meter applications where sensor drift requires periodic adjustment.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC16C55-XTE/SP — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | PIC16C55-XTE/P | PIC16C55-XT/P | PIC16F54-I/P | PIC16F57-I/P | PIC16C55A-20I/SP |
|---|---|---|---|---|---|---|
| Package | SPDIP-28 | SPDIP-28 | SPDIP-28 | SPDIP-28 | SPDIP-28 | SPDIP-28 |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 768 B OTP EPROM | 768 B OTP EPROM | 768 B OTP EPROM | 768 B Flash | 3 KB Flash | 768 B OTP EPROM |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz | 20 MHz |
| Data RAM | 24 B | 24 B | 24 B | 25 B | 72 B | 24 B |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | 0 C to +70 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Memory Type | OTP EPROM (one-time) | OTP EPROM | OTP EPROM | Flash (reprogrammable) | Flash (reprogrammable) | OTP EPROM |
| ICSP Support | No (parallel programmer required) | No | No | Yes (ICSP) | Yes (ICSP) | No |
| RoHS Status | Non-compliant (SnPb SPDIP) | Non-compliant (SnPb) | Non-compliant (SnPb) | Compliant (Pb-free) | Compliant (Pb-free) | Non-compliant (SnPb) |
| Unit Price (1-pc, USD) | 7.42 | ~7.00 | ~6.50 | ~1.95 | ~2.40 | ~8.10 |
اہم امتیازی خصوصیات
- Extended -40C to +125C temperature grade vs commercial grade alternatives (بمقابلہPIC16C55-XT/P)
- Flash reprogrammability via ICSP for development iterations (بمقابلہPIC16F54-I/P)
- 20 MHz clock headroom for compute-intensive tasks (بمقابلہPIC16C55A-20I/SP)
ڈیزائن نوٹس
The /MCLR pin (pin 4) MUST be tied to VDD through a 10 kohm pull-up resistor - leaving it floating causes intermittent resets and unpredictable behavior. The PIC16C55-XTE/SP does not have an internal weak pull-up on /MCLR like newer PIC MCUs. Additionally, do not place a decoupling capacitor larger than 0.1 uF directly on /MCLR; large capacitance slows the VDD rise time and prevents proper Power-On Reset. Use a 100 nF decoupling cap on VDD within 5 mm of the pin.
Place the 4 MHz crystal or ceramic resonator (with 22 pF load capacitors on each leg) within 5 mm of pins 15 (OSC1) and 16 (OSC2). Keep oscillator traces short and away from high-current switching traces to prevent injection of clock noise. Ground the crystal can to VSS via a short trace. For board layouts exceeding 5 cm square, use a ground plane to stabilize the oscillator and reduce EMI. The XT speed grade supports 4 MHz; using the HS grade crystal topology with this part may cause oscillator failure - stay within the XT specification.
Estimated power budget: PIC16C55-XTE/SP draws ~2 mA active at 4 MHz/5V and ~4 uA in SLEEP mode. At 5V supply the I/O pin current of 25 mA per pin allows direct LED drive without transistors - useful for status indicators. Brown-Out Reset (BOR) is enabled via the configuration word to protect against VDD drops below ~4V; ensure BOR is enabled for safety-critical or industrial applications. Total package dissipation must remain below 800 mW - simultaneous high-current sink on multiple pins can approach this limit.
The 768-byte OTP EPROM can be programmed ONLY ONCE - there is no electrical erase. Use the PIC16C55/JW windowed CERDIP variant during development for UV-erasable iterations, then transition to PIC16C55-XTE/SP for production OTP mask programming. Verify all firmware logic on the JW variant before committing to a mask run; mask NRE charges apply. Code-protect (CP) fuse can be set to prevent firmware readback via the programmer, providing a basic anti-tamper measure.
تعمیل کی معلومات
SnPb finish on SPDIP-28 package makes this part non-RoHS. Not formally AEC-Q100 qualified despite Extended temperature rating. Migrate to PIC16F54-I/P for RoHS-compliant designs.
