PIC16C74BT-20E/L - 8-Bit 20MHz OTP MCU 7KB PLCC-44 | Microchip
MPN: PIC16C74BT-20E/L ✗ اختتامِ زندگیPIC16C74BT-20E/L جائزہ
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + RAM), and programmable I/O peripherals onto one silicon die. The PIC16CXX mid-range family uses a Harvard architecture with separate program and data buses, a 14-bit instruction word, and a RISC instruction set, executing one instruction per instruction cycle (4 clock cycles) for predictable deterministic timing. Within the broader semiconductor hierarchy, an MCU belongs to the logic IC family -> microprocessor -> embedded controller -> mixed-signal SoC.
Key features include 33 digital I/O pins, two 8-bit and three 16-bit timer/counter modules, a 5-channel 8-bit ADC, two analog comparators, a Universal Synchronous/Asynchronous Receiver/Transmitter (USART/SCI), a Serial Peripheral Interface (SPI), and an Inter-Integrated Circuit (I2C) bus. The OTP program memory allows one-time programming by the developer, distinguishing this part from UV-erasable EPROM variants. Operating voltage ranges from 4.0V to 6.0V, suiting 5V industrial and automotive designs.
The PIC16C74B architecture employs a 14-bit instruction pipeline with an 8-level hardware stack, supporting interrupt-driven designs with prioritized vectored interrupts. Brown-out Reset (BOR) and Power-on Reset (POR) circuitry protect against unstable supply conditions, while the Watchdog Timer (WDT) with its own on-chip RC oscillator provides system recovery from software lockups - critical for automotive and industrial environments where firmware reliability is non-negotiable.
Typical applications include automotive body electronics, industrial control subsystems, sensor interface modules, HVAC controllers, and legacy embedded systems requiring field-programmable OTP at production volume. The 20MHz instruction throughput and 5-channel ADC make it well-suited for closed-loop motor control and PID-based process regulation.
When designing with the PIC16C74B, ensure the operating supply stays within 4.0V to 6.0V and that decoupling capacitors (typically 0.1uF ceramic) are placed within 5mm of VDD/SS pins. The PLCC-44 socket allows field replacement and in-circuit programming, but OTP memory means firmware must be fully verified before production programming.
کے لیے ڈراپ اِن متبادل PIC16C74BT-20E/L — 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 PIC16C74BT-20E/L (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Core Architecture, Timers, Package, Program Memory Size, Maximum Clock Frequency.
PIC16C74BT-20/L
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC16C74BT-20I/L
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74B-20/L
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74B-04E/L
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F74-I/L
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74BT-20E/L زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core Architecture | PIC16CXX mid-range 8-bit RISC |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 192 x 8 bytes |
| زیادہ سے زیادہ کلاک فریکوئنسی | 20 MHz |
| Instruction Cycle Time | 200 ns (at 20 MHz) |
| Operating Voltage (VDD) | 4.0 V to 6.0 V |
| I/O Pins | 33 |
| Timers | 2 x 8-bit, 3 x 16-bit |
| ADC | 5-channel, 8-bit |
| Analog Comparators | 2 |
| Communication Interfaces | USART/SCI, SPI, I2C |
| آپریٹنگ درجہ حرارت رینج | -40 C to +125 C (automotive grade E) |
| پیکیج | 44-pin PLCC (16.59 x 16.59 mm), J-bend leads |
| ماؤنٹنگ ٹائپ | Surface Mount (PLCC socket compatible) |
| Lead Form | J-Bend (PLCC) |
| Brown-out Reset | Yes |
| Watchdog Timer | Yes (independent on-chip RC oscillator) |
| Program Memory Type | OTP (One-Time Programmable) |
PIC16C74BT-20E/L پن کنفیگریشن
| پن 1 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| پن 2 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| پن 3 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| پن 4 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| پن 5 | RE0/RD/AN5 — PORTE bit 0 / Read signal for PSP / Analog input 5 |
| پن 6 | RE1/WR/AN6 — PORTE bit 1 / Write signal for PSP / Analog input 6 |
| پن 7 | RE2/CS/AN7 — PORTE bit 2 / Chip select for PSP / Analog input 7 |
| پن 8 | VDD — Positive supply (4.0V to 6.0V) |
| پن 9 | VSS — Ground reference |
| پن 10 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| پن 11 | OSC2/CLKOUT — Crystal oscillator output / clock output (Fosc/4) |
| پن 12 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| پن 13 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / Capture-Compare-PWM 2 |
| پن 14 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 |
| پن 15 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پن 16 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پن 17 | RC5/SDO — PORTC bit 5 / SPI data out |
| پن 18 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| پن 19 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| پن 20 | VSS — Ground reference |
| پن 21 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| پن 22 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| پن 23 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| پن 24 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| پن 25 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| پن 26 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| پن 27 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| پن 28 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| پن 29 | VSS — Ground reference |
| پن 30 | VDD — Positive supply (4.0V to 6.0V) |
| پن 31 | RB0/INT — PORTB bit 0 / External interrupt |
| پن 32 | RB1 — PORTB bit 1 |
| پن 33 | RB2 — PORTB bit 2 |
| پن 34 | RB3 — PORTB bit 3 |
| پن 35 | RB4 — PORTB bit 4 (interrupt-on-change) |
| پن 36 | RB5 — PORTB bit 5 (interrupt-on-change) |
| پن 37 | RB6/PGC — PORTB bit 6 / In-circuit debugger clock |
| پن 38 | RB7/PGD — PORTB bit 7 / In-circuit debugger data |
| پن 39 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| پن 40 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| پن 41 | MCLR/VPP — Master clear reset / Programming voltage input |
| پن 42 | NC — Not connected (per datasheet) |
| پن 43 | NC — Not connected (per datasheet) |
| پن 44 | NC — Not connected (per datasheet) |
عام استعمالات
PIC16C74BT-20E/L کے لیے موزوں ہے 6 ایپلیکیشنs: Automotive Body Control Modules, Industrial HVAC Control, Sensor Interface Front-Ends, Motor Speed Controllers, Vending Machine Controllers, Legacy Industrial PLC I/O Modules.
Automotive Body Control Modules
The PIC16C74BT-20E/L's automotive-grade -40C to +125C operating range and 20MHz throughput make it a strong fit for automotive body control modules managing door locks, window lifters, seat position memory, and interior lighting. The 5-channel 8-bit ADC reads potentiometric position sensors for seat and mirror adjustment, while the 33 digital I/O pins drive relay drivers and switch-matrix keypad inputs. Its 7KB OTP program memory holds fixed-function body-control firmware, and the integrated CAN-less USART/SPI/I2C stack supports communication with body domain controllers. The automotive E temperature grade handles under-hood thermal stress without derating.
تجویز کردہ
Industrial HVAC Control
In HVAC fan-coil and rooftop-unit controllers, the PIC16C74BT-20E/L provides the deterministic 200ns instruction cycle needed for closed-loop temperature regulation with PID control running at 1 kHz update rates. The 5-channel ADC samples thermistor inputs (return air, supply air, outdoor, coil, and setpoint potentiometer), while two 16-bit timers drive triac phase-angle firing for variable-speed blower motors. The 33 I/O pins interface with thermostat keypads, mode switches, and 7-segment displays. OTP memory suits fixed-firmware production runs where per-unit programming cost dominates over flexibility.
تجویز کردہ
Sensor Interface Front-Ends
The PIC16C74BT-20E/L serves as a digital front-end for legacy 4-20 mA and 0-10V industrial sensor transmitters, multiplexing multiple analog channels through its 5-input ADC, linearizing the result, and outputting a calibrated value via the USART in Modbus RTU format. The 20MHz clock sustains 9600/19200 baud Modbus traffic without CPU saturation, leaving cycles for sensor linearization math. The 192-byte RAM is adequate for Modbus packet buffers and a small coefficient table, and the 7KB OTP holds the calibration and protocol stack. The automotive E temperature grade suits outdoor or cabinet-mounted installations.
تجویز کردہ
Motor Speed Controllers
For low-voltage brushed DC and universal motor speed controllers, the PIC16C74BT-20E/L generates PWM at up to 20MHz timer resolution, enabling 10-bit PWM at 19.5 kHz for quiet BLDC commutation or 8-bit PWM at 78 kHz for ultrasonic-frequency silent drives. The three 16-bit timers handle quadrature encoder input for closed-loop velocity feedback, while the 5-channel ADC monitors motor current via shunt resistor, supply voltage, and temperature. OTP memory locks the motor control algorithm at production. The automotive temperature grade handles under-hood or unventilated enclosure environments without thermal derating.
تجویز کردہ
Vending Machine Controllers
The PIC16C74BT-20E/L's 33 I/O pins accommodate multi-currency coin acceptor interfaces, MDB peripheral bus, vend-mechanism actuator drivers, and 7-segment or character-LCD user displays. The 7KB OTP memory stores pricing tables, audit logs, and vending state machine firmware that is rarely updated in the field. The 20MHz instruction throughput handles real-time pulse counting from coin validators at 50 kHz maximum without dropped counts. Two analog comparators enable zero-cross detection for triac-driven refrigeration compressors. OTP ensures fixed production firmware, deterring field tampering and reducing EEPROM-related counterfeit risk.
تجویز کردہ
Legacy Industrial PLC I/O Modules
In distributed I/O blocks that interface with older PLCs over RS-232 or RS-485, the PIC16C74BT-20E/L acts as a slave protocol converter, digitizing 4-20 mA inputs through the 5-channel ADC and latching output states through the 33 digital I/O pins. The USART peripheral supports 9-bit multiprocessor communication used by some legacy PLC protocols, while the SPI peripheral interfaces with shift-register-based digital I/O expansion. The OTP memory holds the fixed protocol translator firmware. The automotive E temperature grade is suitable for factory-floor cabinets with elevated ambient temperatures from adjacent motor drives.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC16C74BT-20E/L — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | PIC16C74BT-20/L | PIC16C74BT-20I/L | PIC16C74B-20/L | PIC16C74B-04E/L | PIC16F74-I/L |
|---|---|---|---|---|---|---|
| Package | 44-PLCC | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC16 8-bit RISC | PIC16 8-bit RISC - same | PIC16 8-bit RISC - same | PIC16 8-bit RISC - same | PIC16 8-bit RISC - same | PIC16 8-bit RISC - same |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 4 MHz (-80%) | 20 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB Flash (reprogrammable) |
| Operating Temperature | -40C to +125C (E grade) | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +125C (E grade) | -40C to +85C (industrial) |
| ADC Channels | 5 x 8-bit | 5 x 8-bit | 5 x 8-bit | 5 x 8-bit | 5 x 8-bit | 5 x 8-bit |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active |
اہم امتیازی خصوصیات
- Automotive E temperature grade support (-40C to +125C) (بمقابلہPIC16C74B-20/L)
- OTP memory for fixed-function production firmware (بمقابلہPIC16F74-I/L)
- Higher clock speed headroom than the -04 variant (بمقابلہPIC16C74B-04E/L)
ڈیزائن نوٹس
The PIC16C74BT-20E/L requires a regulated 4.0V to 6.0V supply; typical designs use a 7805 linear regulator or equivalent. Place a 0.1uF ceramic decoupling capacitor within 5mm of the VDD pin (pin 8) and VSS pin (pin 9), and add a bulk 10uF electrolytic at the regulator output to suppress load-transient dips. The Brown-out Reset (BOR) circuit holds the MCU in reset when VDD falls below ~4.0V, preventing code execution from corrupt memory states during power-down. Avoid noise on the MCLR/VPP pin (pin 41) by tying it to VDD through a 10kohm resistor with a 0.1uF decoupling cap directly at the pin - any noise here can spuriously trigger resets or interrupt programming mode.
The PLCC-44 package can be socketed for field upgradeability (use a 44-pin PLCC through-hole socket such as Aries 44-6518-10), or soldered directly to SMT pads with J-bend leads. When using a socket, route high-frequency signals away from the socket body to minimize parasitic inductance. Crystal traces on pins 10 (OSC1) and 11 (OSC2) should be kept short (<10mm) and guarded with a ground pour to reduce EMI susceptibility. For RS-232 driver chips, keep the charge-pump capacitors within 2mm of the driver IC pins, and route the driver outputs perpendicular to the MCU's RX/TX traces to minimize coupling.
OTP program memory cannot be erased or rewritten - verify all firmware on a flash-based PIC16F74 prototype before committing to OTP production programming. LVP (Low-Voltage Programming) mode via the PGM pin and standard ICSP mode via RB6/RB7 (PGC/PGD) are mutually exclusive configurations; the CONFIG word LVP bit determines which mode is active, and a wrong choice can lock out programming access. The Watchdog Timer (WDT) is enabled by default in the configuration word - explicitly clear the WDTE bit if WDT is not needed, or service the CLRWDT instruction in all long-timeout loops to prevent unintended resets. Do not exceed 20 MHz at VDD below 4.5V; refer to the datasheet's VDD-vs-Frequency graph.
تعمیل کی معلومات
RoHS and REACH compliance status not explicitly stated in verified distributor data; the 44-pin PLCC package with J-bend leads typically uses tin-lead plating. Not AEC-Q100 qualified (automotive E temperature grade is industrial specification, not AEC-Q100). Lead-free and RoHS-compliant variants are not generally available for this obsolete OTP device.
