PIC16C74BT-20E/PT - 8-Bit 20MHz 7KB OTP MCU | Microchip
MPN: PIC16C74BT-20E/PT ✗ پایان تولیدPIC16C74BT-20E/PT نمای کلی
What is a PIC16C mid-range MCU? The PIC16C74B belongs to Microchip's PIC16C mid-range family of 8-bit CMOS microcontrollers - fully-static RISC-style processors featuring a 14-bit instruction set, single-cycle execution except for branches, and a Harvard architecture separating program and data memory. The PIC16C family sits within the broader 8-bit MCU hierarchy (8-bit microcontroller -> microcontroller -> embedded computing -> semiconductor IC) and is designed for cost-sensitive embedded control applications requiring deterministic execution, low power consumption, and peripheral integration.
Key features of the PIC16C74BT-20E/PT include an integrated 8-channel, 8-bit Analog-to-Digital Converter (ADC), three timer/counter modules, a Universal Synchronous Asynchronous Receiver Transmitter (USART), a Synchronous Serial Port (SSP) supporting SPI and I2C, a Capture/Compare/PWM (CCP) module, and 33 digital I/O pins across multiple ports. The device operates from 2.5V to 6.0V and offers low-power Sleep mode with wake-up on pin change.
Architecturally, the PIC16C74B uses a 14-bit program word and 8-bit data path with a two-stage pipeline, achieving 200ns instruction cycle at 20MHz. The device is fabricated in CMOS technology with OTP EPROM program memory, making it ideal for mature, stable production designs where field reprogrammability is not required. Brown-out Reset (BOR), Power-on Reset (POR), and Watchdog Timer with its own on-chip RC oscillator provide robust system-level reliability.
Typical applications include industrial motor control, HVAC fan/blower controllers, appliance control boards, automotive body electronics (non-safety), sensor signal conditioning with on-chip ADC, and legacy embedded system upgrades where PIC16C code compatibility is required. The Extended temperature grade supports outdoor and industrial enclosure deployments.
When designing with this MCU, ensure that OTP programming is performed before final PCB conformal coating, as OTP memory cannot be re-programmed in-circuit. The 44-TQFP package requires careful PCB layout with proper ground planes to minimize noise coupling into the analog ADC inputs, and decoupling capacitors must be placed within 3mm of each VDD pin per Microchip guidance.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet alone - including lifecycle status, cross-reference candidates, and TQFP-44 layout guidance compiled from Microchip application notes.
جایگزین‌های drop-in برای PIC16C74BT-20E/PT — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای PIC16C74BT-20E/PT (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Core Architecture, Package, Program Memory Size, Program Memory Type, ADC.
PIC16C74B-20I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16C74BT-04I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16C74BT-20/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16C74BT-04E/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16F74-I/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC16C74BT-20E/PT حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Architecture | PIC16C mid-range 8-bit RISC |
| Instruction Set Width | 14 bits |
| حداکثر فرکانس کلاک | 20 MHz |
| Instruction Cycle Time | 200 ns (at 20 MHz) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| RAM | 192 bytes |
| Data EEPROM | Not present (OTP family) |
| ADC | 8-channel, 8-bit |
| Supply Voltage (VDD) | 2.5 V to 6.0 V |
| دمای کاری | -40 C to +125 C (Extended, "E") |
| Digital I/O Pins | 33 |
| Timers | 3 (Timer0, Timer1, Timer2) |
| CCP Modules | 1 (Capture/Compare/PWM) |
| Communication Peripherals | USART + SSP (SPI / I2C) |
| بسته‌بندی | 44-pin TQFP (10x10 mm) |
| نوع نصب | Surface Mount |
پیکربندی پین PIC16C74BT-20E/PT
| پین 1 | MCLR#/VPP — Master Clear (Reset, active low) / Programming voltage input |
| پین 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| پین 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| پین 4 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| پین 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input channel 3 / ADC VREF+ |
| پین 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| پین 7 | RA5/AN4/SS# — PORTA bit 5 / Analog input 4 / SPI Slave Select |
| پین 8 | RE0/RD#/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| پین 9 | RE1/WR#/AN6 — PORTE bit 1 / Write control / Analog input 6 |
| پین 10 | RE2/CS#/AN7 — PORTE bit 2 / Chip Select / Analog input 7 |
| پین 11 | VSS — Ground reference |
| پین 12 | OSC1/CLKIN — Oscillator crystal input / External clock input |
| پین 13 | OSC2/CLKOUT — Oscillator crystal output / Clock output |
| پین 14 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| پین 15 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| پین 16 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM1 output |
| پین 17 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پین 18 | RD0 — PORTD bit 0 |
| پین 19 | RD1 — PORTD bit 1 |
| پین 20 | RD2 — PORTD bit 2 |
| پین 21 | RD3 — PORTD bit 3 |
| پین 22 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پین 23 | RC5/SDO — PORTC bit 5 / SPI data out |
| پین 24 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| پین 25 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| پین 26 | RD4 — PORTD bit 4 |
| پین 27 | RD5 — PORTD bit 5 |
| پین 28 | RD6 — PORTD bit 6 |
| پین 29 | RD7 — PORTD bit 7 |
| پین 30 | VSS — Ground reference |
| پین 31 | VDD — Positive supply voltage |
| پین 32 | RB0/INT — PORTB bit 0 / External interrupt |
| پین 33 | RB1 — PORTB bit 1 |
| پین 34 | RB2 — PORTB bit 2 |
| پین 35 | RB3 — PORTB bit 3 |
| پین 36 | RB4 — PORTB bit 4 |
| پین 37 | RB5 — PORTB bit 5 |
| پین 38 | RB6/PGC — PORTB bit 6 / In-circuit debugger clock |
| پین 39 | RB7/PGD — PORTB bit 7 / In-circuit debugger data |
| پین 40 | VSS — Ground reference |
| پین 41 | VDD — Positive supply voltage |
| پین 42 | NC — Not connected (per datasheet) |
| پین 43 | NC — Not connected (per datasheet) |
| پین 44 | NC — Not connected (per datasheet) |
کاربردهای معمول
PIC16C74BT-20E/PT مناسب است برای 6 کاربردs: Industrial Motor Control, HVAC Fan / Blower Controller, Appliance Control Board, Automotive Body Electronics (Non-Safety), Sensor Signal Conditioning Hub, Legacy Embedded System Sustainment.
Industrial Motor Control
The PIC16C74BT-20E/PT suits industrial motor control applications requiring deterministic real-time response and integrated analog feedback. Its 20 MHz instruction cycle (200 ns) enables sub-microsecond control loop execution for brushed DC motor velocity and torque loops. The 8-channel 8-bit ADC captures current-sense amplifiers and tachogenerator feedback simultaneously, while the CCP module generates PWM drive signals at up to 10 kHz with 10-bit resolution. The 33 I/O pins provide direct interface to H-bridge drivers, encoder inputs, and fault detection circuitry. Extended -40 C to +125 C operation handles cabinet-mounted applications. Use the PIC16C74BT-20E/PT when firmware is locked and verified; for new designs prefer PIC16F74-I/PT.
پیشنهادی
HVAC Fan / Blower Controller
The PIC16C74BT-20E/PT integrates the I/O, ADC, PWM, and communication peripherals needed for closed-loop HVAC blower control in a single 44-TQFP package. The 8-bit ADC reads temperature sensors (NTC thermistors via resistor divider) and pressure transducers for variable-air-volume systems. The CCP module generates a PWM drive for the blower MOSFET, while the USART interfaces to the building management system (BACnet/Modbus gateway). The Extended -40 C to +125 C temperature range supports rooftop unit installations. The 192-byte RAM and 7 KB OTP memory fit typical fan-control state machines including soft-start, fault lockout, and ramp-down profiles. OTP permanence suits safety-certified HVAC designs where firmware validation is locked.
پیشنهادی
Appliance Control Board
The PIC16C74BT-20E/PT is widely deployed in major-appliance control boards (washing machines, dishwashers, ovens) where its OTP memory, integrated peripherals, and Extended temperature range provide the right balance of cost, integration, and reliability. The 33 digital I/O pins drive relay coils, triac gates, valve solenoids, and seven-segment displays directly. The USART enables in-system diagnostics or factory calibration via an external test fixture. Brown-out Reset and Watchdog Timer maintain safe operation across AC-line brown-outs. The 7 KB OTP program memory holds complex wash-cycle or cooking profiles with multiple phase transitions. Choose this part for legacy or cost-sensitive appliance designs; new designs should evaluate PIC16F1939 for enhanced peripherals.
پیشنهادی
Automotive Body Electronics (Non-Safety)
The PIC16C74BT-20E/PT serves in non-safety automotive body modules such as seat controllers, mirror adjusters, interior lighting, and accessory multiplexers. Its Extended -40 C to +125 C operating range handles under-dash and cabin environments. The USART supports LIN (Local Interconnect Network) slave implementations with bit-banged timing on general I/O when needed. The ADC multiplexes multiple switch-position inputs and thermistor sensors. OTP memory provides firmware immutability, an advantage for anti-tamper or anti-counterfeit applications. Note that AEC-Q100 automotive qualification is not specified for this commercial/industrial grade part; for safety-critical automotive designs, choose PIC16F74-I/PT with appropriate automotive-grade documentation or a Q-qualified equivalent.
پیشنهادی
Sensor Signal Conditioning Hub
The PIC16C74BT-20E/PT functions as a multi-channel sensor signal conditioning and digital conversion hub in industrial instrumentation. The 8-channel 8-bit ADC digitizes strain gauge bridges, thermistors, photocells, and 4-20 mA loop receivers (via burden resistor). The SPI/I2C peripheral reads calibration data from external EEPROM or higher-resolution ADC companions. The USART outputs digital telemetry to a host controller or industrial network gateway. With Extended temperature operation, the device survives factory-floor cabinet environments. OTP memory locks calibration coefficients in firmware, eliminating the need for external non-volatile memory. This suits pressure transmitters, weigh scales, and multi-zone environmental monitors.
پیشنهادی
Legacy Embedded System Sustainment
The PIC16C74BT-20E/PT supports long-life sustainment of legacy embedded systems where re-qualification of firmware is cost-prohibitive. Examples include industrial CNC controllers, medical instrumentation (post design freeze), and aerospace ground-support equipment. The 7 KB OTP memory holds verified firmware that has accumulated regulatory and customer approvals over decades; replacing the MCU family would trigger costly re-validation. The Extended temperature range and 44-TQFP package match existing PCB footprints, enabling drop-in replacement on field-returned boards. For these sustainment scenarios, the NRND lifecycle status means Microchip provides long-term purchase support with extended lead times, and cross-reference alternatives ensure availability during component shortages.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC16C74BT-20E/PT — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC16C74B-20I/PT | PIC16C74BT-04I/PT | PIC16C74BT-20/PT | PIC16C74BT-04E/PT | PIC16F74-I/PT |
|---|---|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Frequency | 20 MHz | 20 MHz | 4 MHz | 20 MHz | 4 MHz | 20 MHz |
| Program Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash |
| Operating Temperature | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C | -40 C to +125 C | -40 C to +85 C |
| Program Memory Size | 7 KB (4K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) |
| ADC | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | Active |
تفاوت‌های کلیدی
- Extended -40C to +125C temperature grade (در مقابلPIC16C74B-20I/PT)
- Full 20 MHz speed grade versus derated family members (در مقابلPIC16C74BT-04E/PT)
- OTP memory lock for regulatory-approved firmware (در مقابلPIC16F74-I/PT)
یادداشت‌های طراحی
Place decoupling capacitors (100 nF ceramic plus optional 10 uF tantalum or ceramic) within 3 mm of each VDD pin (pins 31 and 41 on the 44-TQFP package) and each VSS pin. Use a star-ground topology with separate analog (VSS) and digital (DGND) returns joined only at the MCU VSS pin. For ADC accuracy, place the analog reference bypass capacitor (100 nF) directly at the VREF+ pin with trace length under 5 mm. The exposed pad on the 44-TQFP (PT) package should be soldered to a copper pad on the PCB for thermal dissipation, even though this pin is internally connected to VSS.
The PIC16C74BT-20E/PT uses OTP (One-Time Programmable) EPROM, which CANNOT be re-programmed in-circuit. Once programmed, the device must be discarded if a firmware bug is found. Always program OTP parts on a development board or socketed adapter first, then transfer to production board. Also note the MCLR#/VPP pin requires a careful reset circuit: a 10 kohm pull-up to VDD plus a 100 nF capacitor to ground provides a clean power-on reset; do not leave MCLR# floating. The ICSP (In-Circuit Serial Programming) pins RB6/PGC and RB7/PGD must be accessible for production programming.
Estimated: at 20 MHz clock with VDD = 5.0 V and all peripherals active, the PIC16C74BT-20E/PT typical operating current is approximately 15-20 mA. Sleep mode reduces this to under 5 uA typical. Brown-out Reset (BOR) should be enabled in the configuration word to ensure safe reset on VDD brown-out; BOR threshold options include 2.5V, 4.0V, and 4.5V. The Watchdog Timer (WDT) with its own 18 ms (nominal) internal RC oscillator is independent of the system clock and continues running during Sleep to wake the MCU on overflow.
اطلاعات انطباق
RoHS/lead-free status for the PT (TQFP) suffix variant is not explicitly stated in the verified data; verify on Microchip product page before quoting. AEC-Q100 not qualified - for safety-critical automotive, choose a Q-qualified part. Conflict-minerals compliance assumed per Microchip standard policy.