PIC16C74B-04I/P - 8-Bit 4MHz OTP MCU 7KB 40-PDIP | Microchip
MPN: PIC16C74B-04I/P ✓ فعالPIC16C74B-04I/P جائزہ
What is a PIC16 mid-range MCU? The PIC16CXX family is a generation of Microchip 8-bit microcontrollers built around a Harvard RISC architecture that executes single-cycle instructions from a 14-bit program word store. Mid-range PICs combine a compact 35-instruction set with integrated peripherals (ADC, timers, USART, SPI/I2C) and have been a workhorse for industrial, automotive aftermarket, and legacy embedded designs since the 1990s. The PIC16C74B specifically targets applications that need more I/O and memory than the smaller PIC16C6x family while keeping the OTP cost advantage.
Key features include 8 channels of 8-bit ADC, two 8-bit timers plus one 16-bit timer, two Capture/Compare/PWM (CCP) modules, a synchronous serial port configurable as SPI or I2C, and a USART for asynchronous serial communication. The device supports 33 digital I/O lines organized across five ports (PORTA-PORTE), an operating voltage of 4.0 V to 5.5 V, and an industrial temperature grade of -40 °C to +85 °C as indicated by the "I" suffix.
Architecturally, the PIC16C74B uses a fully-static CMOS design with separate program and data buses (Harvard architecture), enabling single-cycle instruction fetch plus execute on all instructions except program branches, which take two cycles. The 04 speed grade specifies a 4 MHz maximum oscillator input. The "C" in PIC16C denotes the OTP/EPROM ROMless windowed family, distinguished from the flash-based "F" parts such as the PIC16F877.
Typical applications include industrial control panels, instrumentation and metering, sensor interfacing using the on-chip ADC, motor-control hobby projects using the CCP/PWM channels, and legacy embedded systems that require OTP-based firmware storage for cost or anti-retrofit reasons. Because the part is OTP, firmware is committed at programming time and cannot be re-flashed in-circuit.
When designing with this device, place a 0.1 µF decoupling capacitor on VDD within 5 mm of the pin and use a bulk 10 µF tantalum on the supply rail. The MCLR reset pin must be pulled high through a 10 kΩ resistor for normal operation; an optional reset circuit can use a diode and RC network for power-on-reset delay.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
کے لیے ڈراپ اِن متبادل PIC16C74B-04I/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 PIC16C74B-04I/P (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Serial Interfaces, Core Architecture, Operating Temperature, Instruction Set.
PIC16C74B-04/PQ
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74B-20I/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74A-04I/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74B-04I/PQ
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F877-04I/P
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74B-04I/L
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74B-04I/P زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core Architecture | PIC16CXX 8-bit RISC (Harvard) |
| CPU Family | PIC16 mid-range |
| زیادہ سے زیادہ کلاک فریکوئنسی | 4 MHz |
| Instruction Cycle Time | 200 ns |
| Program Memory Size | 7 KB (4K x 14) OTP |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Data RAM | 192 bytes |
| Data EEPROM | None (none on die for this OTP MCU) |
| I/O Pins | 33 |
| ADC | 8 channels, 8-bit resolution |
| Timers | 2 x 8-bit + 1 x 16-bit |
| Capture/Compare/PWM | 2 CCP modules |
| Serial Communication | 1 x USART (SCI), 1 x SSP (SPI / I2C) |
| سپلائی وولٹیج | 4.0 V to 5.5 V |
| آپریٹنگ درجہ حرارت | -40 °C to +85 °C (industrial grade, "I") |
| Package Type | 40-pin PDIP (Plastic DIP, through-hole) |
| Instruction Set | 35 single-word instructions |
| RoHS اسٹیٹس | Compliant |
| ماؤنٹنگ ٹائپ | Through-Hole (DIP) |
PIC16C74B-04I/P پن کنفیگریشن
| پن 1 | MCLR/VPP — Master Clear (reset) input / programming voltage input |
| پن 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| پن 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| پن 4 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| پن 5 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / ADC reference |
| پن 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| پن 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| پن 8 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| پن 9 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| پن 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| پن 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 output |
| پن 12 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| پن 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پن 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پن 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| پن 16 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| پن 17 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| پن 18 | GND — Ground (logic) |
| پن 19 | GND — Ground (logic) |
| پن 20 | VCC — Positive supply +5 V |
| پن 21 | VCC — Positive supply +5 V |
| پن 22 | RB0/INT — PORTB bit 0 / external interrupt |
| پن 23 | RB1 — PORTB bit 1 |
| پن 24 | RB2 — PORTB bit 2 |
| پن 25 | RB3/PGM — PORTB bit 3 / low-voltage programming entry |
| پن 26 | RB4 — PORTB bit 4 |
| پن 27 | RB5 — PORTB bit 5 |
| پن 28 | RB6/PGC — PORTB bit 6 / ICSP clock |
| پن 29 | RB7/PGD — PORTB bit 7 / ICSP data |
| پن 30 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| پن 31 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| پن 32 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| پن 33 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| پن 34 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| پن 35 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| پن 36 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| پن 37 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| پن 38 | RE0/RD/AN5 — PORTE bit 0 / read control for PSP / analog 5 |
| پن 39 | RE1/WR/AN6 — PORTE bit 1 / write control for PSP / analog 6 |
| پن 40 | RE2/CS/AN7 — PORTE bit 2 / chip select for PSP / analog 7 |
عام استعمالات
PIC16C74B-04I/P کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Control Panels, Sensor Interface and Data Acquisition, Motor Speed Control (Hobby/Small DC), Legacy Embedded Replacement / Board Refresh, Educational / Training Boards, Instrumentation and Metering.
Industrial Control Panels
The PIC16C74B-04I/P suits industrial control panels thanks to its 33 I/O pins for relay drivers, 8-channel 8-bit ADC for analog sensor reading, and industrial -40 to +85 °C rating. At 4 MIPS (4 MHz, 200 ns per instruction) the part drives HMI keypads, indicator LEDs, and 4-20 mA loops comfortably. The CCP/PWM modules handle proportional valve control. Pin-compatible with the flash-based PIC16F877A-I/P for in-field firmware updates.
تجویز کردہ
Sensor Interface and Data Acquisition
With eight 8-bit ADC channels, the PIC16C74B-04I/P acts as a compact sensor front-end for temperature, pressure, or light sensors. The integrated USART streams converted data to a host PLC at 19.2 kbaud or higher. Industrial temp rating permits deployment near motors or HVAC ducts. The 192-byte RAM holds local averaging buffers, and the SSP port can drive an external I2C EEPROM for log retention.
تجویز کردہ
Motor Speed Control (Hobby/Small DC)
The two CCP/PWM channels deliver independent 10-bit PWM for brushed DC motor control or small stepper sequencing. At 4 MHz the 7 KB OTP holds 4 K instructions - ample for trapezoidal commutation tables, PID loops, and tachometer feedback. The 33 I/O drive H-bridge enable lines and quadrature encoder inputs. Designers upgrade to PIC16F877A-I/P when firmware revisions are expected.
تجویز کردہ
Legacy Embedded Replacement / Board Refresh
The PIC16C74B-04I/P is widely used to refresh boards originally designed around the PIC16C74A or PIC16F877. Because the OTP memory holds committed firmware, no in-field upgrade is possible - a benefit for tamper-resistant appliances. Drop-in compatibility with the PIC16C74A-04I/P and PIC16F877-04I/P lets refurb shops swap dies without layout changes. Industrial temp grade handles warm enclosures.
تجویز کردہ
Educational / Training Boards
Educational labs and microcontroller training kits favor the PIC16C74B-04I/P because it demonstrates the PIC16 mid-range core, OTP programming workflow, and a full peripheral set (ADC, PWM, USART, SPI/I2C) in a friendly 40-PDIP socket. The 7 KB program memory fits substantial C or assembly projects; the 192-byte RAM limits data arrays but is more than enough for textbook exercises. Easy to swap during lab damage recovery.
تجویز کردہ
Instrumentation and Metering
Digital panel meters and stand-alone instrumentation benefit from the PIC16C74B-04I/P's 8-bit ADC for voltage/current measurement, USART for Modbus or proprietary serial output, and industrial temperature tolerance for cabinet-mounted meters. The two CCP channels drive LED/LCD backlight PWM and buzzer alarm tones. The DIP package is socket-friendly, simplifying field replacement in metering hardware.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC16C74B-04I/P — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | PIC16C74B-04/P | PIC16C74B-20I/P | PIC16C74A-04I/P | PIC16F877-04I/P | PIC16C74B-04I/L |
|---|---|---|---|---|---|---|
| Package | 40-PDIP | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-CERDIP - same pinout, ceramic windowed |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock | 4 MHz | 4 MHz | 20 MHz | 4 MHz | 4 MHz | 4 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB Flash | 7 KB EPROM (UV erasable) |
| Temperature Grade | Industrial (-40 to +85 °C) | Commercial (0 to +70 °C) | Industrial (-40 to +85 °C) | Industrial (-40 to +85 °C) | Industrial (-40 to +85 °C) | Industrial (-40 to +85 °C) |
| Data EEPROM | None | None | None | None | 256 bytes | None |
| ADC | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 10-bit | 8 ch x 8-bit |
| Supply Voltage | 4.0 - 5.5 V | 4.0 - 5.5 V | 4.0 - 5.5 V | 4.0 - 5.5 V | 2.0 - 5.5 V | 4.0 - 5.5 V |
اہم امتیازی خصوصیات
- True 40-pin PDIP drop-in position with OTP memory (بمقابلہPIC16F877-04I/P)
- Industrial -40 to +85 °C temperature grade (بمقابلہPIC16C74B-04/P)
- 4 MHz speed grade optimized for cost-sensitive low-MIPS tasks (بمقابلہPIC16C74B-20I/P)
ڈیزائن نوٹس
Decouple VDD with a 0.1 µF ceramic capacitor placed within 5 mm of pins 11 and 32, and add a bulk 10 µF tantalum on the supply rail. Two VDD pins are provided to reduce digital switching noise on the analog AVSS/AVDD pair. During OTP programming the VPP pin (pin 1) must reach 13.0 V to 13.25 V - use a regulated HV supply and a 1 kΩ series resistor to limit current.
Place the 4 MHz crystal or resonator as close as possible to pins 9 (OSC1) and 10 (OSC2), with the load capacitors (typically 15-33 pF) returned to ground. Keep the MCLR pull-up (10 kΩ to VDD) within 5 mm of pin 1. For noisy environments add a 100 Ω resistor in series with MCLR and a 1 µF cap to ground to form a hardware reset filter.
The PIC16C74B is OTP - firmware cannot be changed after programming. Reserve engineering samples (PIC16C74B-04I/L, the windowed CERDIP variant) for firmware development and validation, then move to the cheaper plastic DIP (PIC16C74B-04I/P) for production. Do not exceed 200 mA total sink/source on PORTB and PORTC combined; the parallel slave port (PORTD/PORTE) shares pins with digital I/O and must be reconfigured after PSP use.
Route analog inputs AN0-AN7 (PORTA and PORTE) away from digital switching traces and the oscillator network. If the ADC reference is taken from VDD, add a 10 µF + 0.1 µF decoupling network at the AVSS pin to keep ADC noise below ±1 LSB. The CCP1/CCP2 PWM outputs (RC2/RC1) should drive the motor bridge through a gate driver, not directly; the I/O pin can only source/sink 25 mA.
تعمیل کی معلومات
RoHS compliant per Microchip product page (PIC16C family is lead-free). Not AEC-Q100 qualified; this is a general-purpose industrial MCU.
