PIC16C74BT-04/L - 8-Bit 4MHz OTP MCU, 7KB, 44-PLCC | Microchip
MPN: PIC16C74BT-04/L ✗ סוף ייצורPIC16C74BT-04/L סקירה
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, and peripherals on one die. Within the broader taxonomy, the PIC16C74B belongs to Microchip's mid-range 8-bit PIC16C family - widely used in industrial control, consumer appliances, and automotive body electronics where deterministic instruction execution and mature CMOS process technology matter more than raw MHz. The 'C' in PIC16C denotes the OTP/EPROM program-memory flavor, while 'B' denotes the silicon revision (B-step). Microcontrollers sit at the foundation of embedded systems, providing programmable intelligence between sensors/actuators and higher-level processors.
Key features include 33 digital I/O pins organized across multiple ports, an integrated 8-channel 8-bit ADC, two 8-bit timers plus one 16-bit timer/counter, a Universal Synchronous/Asynchronous Receiver Transmitter (USART/SCI), and a Synchronous Serial Port (SSP/SPI/I2C). The CMOS, low-power RISC-VIII variant runs from a 5 V rail and supports a commercial 0 °C to +70 °C operating range for benign environments, while a fully-static core architecture enables power-down drivers and reduces quiescent draw - characteristics suited to commissioning industrial control modules requiring deterministic interrupt handling.
Technically, the PIC16C14B uses a Harvard memory bus, a 14-bit shared bus with 35-level shared instruction bus, and a 4-stage pipeline bus design. Functionally, the PIC16C14B uses a Harvard organization with a 14-bit instruction bus and a shared 8-bit data bus; it executes 35 shared instructions at 4 clock bus/cycle, providing deterministic interrupt handling.
Typical applications include industrial control panels, white-goods and consumer appliances, HVAC thermostats, and automotive body controllers requiring deterministic code execution through in-system reprogramming. The wide peripheral availability includes standard CMOS peripherals suitable for direct injection, supporting direct interfaces to sensors and industrial actuators.
When designing with this part, design a robust decoupling strategy using two common decoupling capacitors on the supply pins, and design a stable 5 V supply pin regulator - critical for the industrial control modules requiring deterministic timing in automotive firmware.
חלופות תחליף ישיר עבור PIC16C74BT-04/L — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם PIC16C74BT-04/L (אותו גורם צורה וטביעת רגל) — שונים ב Timers, Core Architecture, Mounting Type, Program Memory Size, Operating Temperature.
PIC16C74B-04I/L
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C74BT-04I/L
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C74B-04/L
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C74B-20I/L
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C74B-20/L
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C74B-04E/L
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C74B-04I/P
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C74BT-04/L דירוגים מרביים ומאפיינים חשמליים
| Product Type | 8-bit Microcontroller (MCU) |
| Family | PIC16CXX (PIC16 mid-range, OTP/PROM) |
| Core | RISC, 8-bit data bus, 14-bit instruction bus |
| CPU Speed | 4 MHz |
| Program Memory | 7 KB (4K x 14) OTP PROM |
| RAM | 192 bytes (192 x 8) |
| I/O Pins | 33 |
| מארז | 44-PLCC (J-lead), 16.59 x 16.59 mm |
| סוג הרכבה | Surface Mount |
| מתח אספקה | 5 V (typical) |
| טמפרטורת פעולה | 0 °C to +70 °C (Commercial) |
| ADC | 8-channel x 8-bit (integrated) |
| Timers | Timer0 (8-bit), Timer1 (16-bit), Timer2 (8-bit) |
| Communication | USART/SCI, SSP/SPI/I2C |
| Instruction Set | 35 instructions, 4 clock/instruction cycle |
| Architecture | Harvard, fully static CMOS |
| Temperature Grade | Commercial (0 °C to +70 °C) |
תצורת פינים של PIC16C74BT-04/L
| פין 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage input |
| פין 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| פין 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| פין 4 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| פין 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input channel 3 / Voltage reference |
| פין 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| פין 7 | RA5/AN4/SS — PORTA bit 5 / Analog input channel 4 / SSP slave select |
| פין 8 | RE0/RD/AN5 — PORTE bit 0 / Read control for parallel slave port / Analog input 5 |
| פין 9 | RE1/WR/AN6 — PORTE bit 1 / Write control for PSP / Analog input 6 |
| פין 10 | RE2/CS/AN7 — PORTE bit 2 / Chip select for PSP / Analog input 7 |
| פין 11 | VDD — Positive supply voltage (5 V) |
| פין 12 | VSS — Ground reference |
| פין 13 | OSC1/CLKIN — Oscillator input / External clock input |
| פין 14 | OSC2/CLKOUT — Oscillator output / Clock output |
| פין 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| פין 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 PWM |
| פין 17 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| פין 18 | RC3/SCK/SCL — PORTC bit 3 / SSP clock (SPI/I2C) |
| פין 19 | RC4/SDI/SDA — PORTC bit 4 / SSP data in / I2C data |
| פין 20 | RC5/SDO — PORTC bit 5 / SSP data out |
| פין 21 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| פין 22 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| פין 23 | RD0/PSP0 — PORTD bit 0 / Parallel slave port bit 0 |
| פין 24 | RD1/PSP1 — PORTD bit 1 / Parallel slave port bit 1 |
| פין 25 | RD2/PSP2 — PORTD bit 2 / Parallel slave port bit 2 |
| פין 26 | RD3/PSP3 — PORTD bit 3 / Parallel slave port bit 3 |
| פין 27 | RD4/PSP4 — PORTD bit 4 / Parallel slave port bit 4 |
| פין 28 | RD5/PSP5 — PORTD bit 5 / Parallel slave port bit 5 |
| פין 29 | RD6/PSP6 — PORTD bit 6 / Parallel slave port bit 6 |
| פין 30 | RD7/PSP7 — PORTD bit 7 / Parallel slave port bit 7 |
| פין 31 | VSS — Ground reference |
| פין 32 | VDD — Positive supply voltage (5 V) |
| פין 33 | RB0/INT — PORTB bit 0 / External interrupt input |
| פין 34 | RB1 — PORTB bit 1 |
| פין 35 | RB2 — PORTB bit 2 |
| פין 36 | RB3 — PORTB bit 3 |
| פין 37 | RB4 — PORTB bit 4 |
| פין 38 | RB5 — PORTB bit 5 |
| פין 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| פין 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| פין 41 | NC — Not connected (per datasheet) |
| פין 42 | NC — Not connected (per datasheet) |
| פין 43 | NC — Not connected (per datasheet) |
| פין 44 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
PIC16C74BT-04/L מתאים עבור 6 יישוםs: Industrial Control Panels, White Goods & Consumer Appliances, HVAC Thermostat Controllers, Automotive Body Controllers, Security & Access-Control Panels, Power Supply Monitoring & Smart Battery Chargers.
Industrial Control Panels
The PIC16C74BT-04/L's 33 digital I/O pins, 8-channel 8-bit ADC, and 5 V CMOS operation make it well-suited for industrial control panels requiring deterministic firmware. The 7 KB OTP memory holds ladder-logic-replacement routines for relay drivers, push-button debouncers, and indicator-LED multiplexers. The 4 MHz CPU executes 35 single-cycle instructions at 250 ns per instruction, fast enough for 1 kHz PID loops on motor-control valves. Designers benefit from the integrated USART for RS-485 half-duplex networking between distributed control panels. The 192-byte RAM is sufficient for stack, scratchpad, and a small protocol buffer, allowing drop-in integration into legacy industrial-control designs that need a reliable, long-lifecycle MCU.
מומלץ
White Goods & Consumer Appliances
The PIC16C74BT-04/L's mature CMOS, low-power design suits white-goods consumer appliances such as washing machines, dishwashers, and microwave ovens. The integrated 8-bit ADC reads thermistor temperature sensors and water-level switches, while the PWM-capable Timer2 drives motor-control triacs and buzzer tones. The 7 KB OTP holds appliance state machines, EEPROM-emulation routines, and fault-log buffers. The fully-static core lets the MCU enter sleep mode between user inputs, dropping quiescent current to microamp levels for energy-efficient standby. The 44-PLCC J-lead package withstands the thermal-cycling stresses of household appliance environments while supporting both surface-mount and socketed mounting.
מומלץ
HVAC Thermostat Controllers
The PIC16C74BT-04/L is well-suited to HVAC thermostat controllers where the 33 I/O pins drive multi-segment LCDs, keypad matrices, and triac-switched furnace/AC stages. The integrated ADC reads NTC thermistors at sub-Hz sample rates, while the USART interfaces with split-system indoor/outdoor communication links. The 7 KB OTP stores fuzzy-logic setpoint curves and adaptive-learning schedules for energy savings. Designers rely on programmed operation of the integrated SSR versus built-in SSR, supporting direct interfaces to temperature sensors and triac actuators. The 4 MHz CPU supports 100 Hz sample rates for room-temperature averaging while leaving cycles for keypad scanning and LCD refresh.
מומלץ
Automotive Body Controllers
The PIC16C74BT-04/L supports legacy automotive body controllers for interior lighting, door modules, and seat-position memories, where its 33 digital I/O drive multiple relay coils and PWM-bright LED arrays. The integrated SSP supports SPI communication with body-control ASICs and CAN-transceiver ICs at 1 Mbps. The 7 KB OTP holds LIN-bus slave stacks and diagnostic-trouble-code storage for service-shop retrieval. The industrial-temperature -04I variant is required for under-dash automotive deployments with -40 °C cold-start and +85 °C roof-line summer heat. The 44-PLCC J-lead package with 16.59 mm body fits legacy automotive PCBs designed before QFN migration became standard.
מומלץ
Security & Access-Control Panels
The PIC16C74BT-04/L is ideal for security and access-control panels with 33 I/O ports, 8-channel ADC, and USART for keypad, RFID reader, and alarm-siren integration. The 7 KB OTP stores encrypted credential tables, alarm-event logs, and intrusion-detection state machines. The integrated timers generate precise pulse-width modulation for magnetic-stripe readers and piezo-buzzer alarm tones. The fully-static CMOS core enables battery-backed sleep modes, drawing under 1 microamp during armed-quiescent states for multi-year operation on a single 9 V backup battery. The 44-PLCC package supports socketed mounting on legacy security panels for fast field replacement.
מומלץ
Power Supply Monitoring & Smart Battery Chargers
The PIC16C74BT-04/L fits smart battery charger and DC power supply monitoring boards where the 8-channel ADC monitors battery voltage, charge current, and cell temperature, while the PWM-capable Timer2 drives synchronous-rectifier MOSFET gate drivers. The 7 KB OTP holds multi-stage charge profiles (Li-Ion CC-CV, NiMH delta-peak, lead-acid equalization) and coulomb-counting firmware. The integrated USART outputs charge-status telemetry to a host display or logging PC. Designers design a robust decoupling strategy using two common decoupling capacitors on the supply pins, designing a stable 5 V supply pin regulator. The 4 MHz CPU executes ADC scans at 10 kHz while leaving cycles for state-machine updates.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC16C74BT-04/L — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC16C74B-04I/L | PIC16C74BT-04I/L | PIC16C74B-04/L | PIC16C74B-20I/L | PIC16C74B-20/L | PIC16C74B-04E/L | PIC16C74B-04I/P |
|---|---|---|---|---|---|---|---|---|
| Package | 44-PLCC (J-lead) | 44-PLCC - same | 44-PLCC - same | 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 | Microchip Technology | Microchip Technology |
| CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 20 MHz | 4 MHz | 4 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| Operating Temperature | 0 °C to +70 °C (Commercial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | 0 °C to +70 °C (Commercial) | -40 °C to +85 °C (Industrial) | 0 °C to +70 °C (Commercial) | -40 °C to +125 °C (Extended) | -40 °C to +85 °C (Industrial) |
| Packing Method | Tape & Reel | Tube | Tape & Reel | Tube | Tube | Tube | Tube | Tube |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| ADC | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
מבדילים עיקריים
- Industrial -40 °C to +85 °C temperature option with identical 44-PLCC pinout (לעומתPIC16C74B-04I/L)
- 5x faster CPU option (20 MHz vs 4 MHz) in same package (לעומתPIC16C74B-20I/L)
- Extended -40 °C to +125 °C option for automotive and outdoor deployments (לעומתPIC16C74B-04E/L)
הערות תכנון
Decouple both VDD pins (11 and 32) with two common decoupling capacitors - a 100 nF ceramic for high-frequency noise and a 10 µF electrolytic for low-frequency bulk filtering - placed within 5 mm of each supply pin. The PIC16C74BT-04/L draws up to 30 mA at 4 MHz/5 V with all peripherals active, so total rail current must be sized accordingly. Estimated: at VDD=5V, IDD=20mA typical, the two-pin pair carries 40mA; a 5V LDO with at least 100 mA headroom is recommended.
Do not skip the configuration resistor on MCLR/VPP (pin 1) - the datasheet specifies a pull-up to VDD through 10-50 kΩ for normal operation, with a path to VPP (typically 13.25 V) during programming. Floating MCLR causes spurious resets or unreliable startup. For in-circuit serial programming (ICSP), isolate the MCLR pull-up from any external reset supervisor with a small signal diode or resistor network.
The PIC16C74BT-04/L's fully-static CMOS core allows the clock to be stopped in software, but when using an external crystal or resonator on OSC1/OSC2 (pins 13-14), keep the trace length under 10 mm and surround the oscillator with a ground pour. Series resistors (10-100 Ω) on each oscillator pin can dampen over-shoot from fast edges. If using the internal RC oscillator, the ADC accuracy depends on stable VDD; add a 100 nF ceramic bypass adjacent to the VREF pin.
Estimated: the 44-PLCC package has a theta_JA of approximately 35 °C/W. At 30 mA active current and 5 V supply, internal dissipation is roughly 150 mW, resulting in a 5.3 °C junction temperature rise above ambient - well within the commercial 0 °C to +70 °C operating range. For the extended -04E variant operating up to +125 °C, the same dissipation raises junction temperature to roughly 130 °C, which is acceptable. No external heatsink is required for any variant.
For 44-PLCC J-lead footprints, design the land pattern per IPC-7351 nominal density with 1.27 mm pitch rectangular pads of at least 0.65 mm width. Allow a 3 mm copper keep-out under the PLCC body for cleaning and inspection access. The PLCC socket (e.g., 44-pin machined-pin socket) is recommended for development boards to simplify MCU swap-out when migrating between commercial and industrial temperature grades.
מידע על תאימות
PIC16C74B family predates RoHS mandates; lead-free / halogen-free status not documented in retrieved sources. Not AEC-Q100 qualified - automotive designs should use the -04I or -04E variants and confirm compliance with Microchip environmental compliance documentation.
