PIC17C42AT-16E/PT - 8-bit OTP MCU, 4KB EPROM, 16MHz, 44-TQFP | Microchip
MPN: PIC17C42AT-16E/PT ✗ پایان تولیدPIC17C42AT-16E/PT نمای کلی
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, I/O peripherals, and timers onto one die; PIC17C-series MCUs are Microchip's high-performance 8-bit RISC family with a 16-bit instruction word and 8-bit data path, sitting in the hierarchy above PIC16 (mid-range) and below PIC18 (enhanced 8-bit) families. PIC17C42A is the entry-point device of the PIC17C line, designed for applications that need more throughput than PIC16 but pre-date the PIC18 migration.
Key features include a 16MHz maximum operating frequency (4MHz system oscillator / 4), 8-level hardware stack, 33 I/O pins with high-current sink/source capability, multiple timer/counter peripherals, and a 16-bit wide instruction path for compact code density. The PIC17C42A Rev. A silicon includes documented errata clarifications against the preliminary PIC17C4X datasheet (DS30412C); users should consult the silicon errata document when programming peripheral registers. The 44-pin TQFP package provides a 0.80mm terminal pitch and integrated thermal dissipation through the lead frame.
Typical applications include industrial control logic, legacy embedded systems, motor-control front-ends, instrumentation front panels, and cost-sensitive consumer electronics that required OTP programmability during the 1990s. Because the part is OTP (one-time-programmable), firmware must be fully verified before blowing the EPROM cells; field updates require device replacement. The 4KB program memory is sufficient for compact control loops, sensor interfaces, and serial-protocol stacks in resource-constrained designs.
When designing with this device, verify supply voltage (4.5V to 5.5V typical) and oscillator stability; the external oscillator must drive the OSC1 pin within the datasheet AC timing budget. The 'E' temperature grade allows operation down to -40C, but the upper limit of +125C should be respected for thermal envelope. This page synthesizes distributor availability, same-package drop-in alternatives, and practical design notes not found in the legacy PIC17C4X preliminary datasheet alone.
جایگزین‌های drop-in برای PIC17C42AT-16E/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 PIC17C42AT-16E/PT (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Operating Temperature Range, Packaging, Oscillator Type, Program Memory Size, RAM Size.
PIC17C42A-16E/P
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC17C42A-25/PT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC17C42A-33I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC17C42A-33I/PQ
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC17C42AT-16I/PT
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC17C42AT-16E/PT حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Architecture | PIC17C 8-bit RISC |
| Program Memory Size | 4KB (2K x 16) OTP EPROM |
| RAM Size | 232 x 8 bytes |
| Number of I/O Pins | 33 |
| حداکثر فرکانس کلاک | 16 MHz |
| Instruction Word Width | 16 bits |
| عرض گذرگاه داده | 8 bits |
| Address Bus Width | 16 bits |
| Oscillator Type | External |
| ولتاژ تغذیه | 4.5 V to 5.5 V |
| دمای کاری | -40 C to +125 C (Extended grade) |
| بسته‌بندی / کیس | 44-TQFP (PT), 0.80 mm pitch |
| نوع نصب | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Hardware Stack Levels | 8 |
| Silicon Revision | Rev. A (errata against DS30412C) |
| Process Technology | CMOS |
پیکربندی پین PIC17C42AT-16E/PT
| پین 1 | OSC1 — External oscillator input |
| پین 2 | RA0/INT — Port A bit 0 / external interrupt |
| پین 3 | RA1 — Port A bit 1 |
| پین 4 | RA2 — Port A bit 2 |
| پین 5 | RA3 — Port A bit 3 |
| پین 6 | RA4 — Port A bit 4 / T0CKI |
| پین 7 | VSS — Ground reference |
| پین 8 | VDD — Positive supply (5V typical) |
| پین 9 | RB0 — Port B bit 0 |
| پین 10 | RB1 — Port B bit 1 |
| پین 11 | RB2 — Port B bit 2 |
| پین 12 | RB3 — Port B bit 3 |
| پین 13 | RB4 — Port B bit 4 |
| پین 14 | RB5 — Port B bit 5 |
| پین 15 | RB6 — Port B bit 6 |
| پین 16 | RB7 — Port B bit 7 |
| پین 17 | RC0 — Port C bit 0 |
| پین 18 | RC1 — Port C bit 1 |
| پین 19 | RC2 — Port C bit 2 |
| پین 20 | RC3 — Port C bit 3 |
| پین 21 | RC4 — Port C bit 4 |
| پین 22 | RC5 — Port C bit 5 |
| پین 23 | RC6 — Port C bit 6 |
| پین 24 | RC7 — Port C bit 7 |
| پین 25 | RD0 — Port D bit 0 / external data bus |
| پین 26 | RD1 — Port D bit 1 / external data bus |
| پین 27 | RD2 — Port D bit 2 / external data bus |
| پین 28 | RD3 — Port D bit 3 / external data bus |
| پین 29 | RD4 — Port D bit 4 / external data bus |
| پین 30 | RD5 — Port D bit 5 / external data bus |
| پین 31 | RD6 — Port D bit 6 / external data bus |
| پین 32 | RD7 — Port D bit 7 / external data bus |
| پین 33 | RE0 — Port E bit 0 / external data bus high |
| پین 34 | RE1 — Port E bit 1 / external data bus high |
| پین 35 | RE2 — Port E bit 2 / external data bus high |
| پین 36 | NC — Not connected (per datasheet) |
| پین 37 | NC — Not connected (per datasheet) |
| پین 38 | MCLR — Master clear (reset) input |
| پین 39 | OSC2 — Oscillator output or external clock input |
| پین 40 | T0CKI — Timer 0 external clock input (legacy naming) |
| پین 41 | VDD — Positive supply (5V typical, second pin) |
| پین 42 | VSS — Ground reference (second pin) |
| پین 43 | NC — Not connected (per datasheet) |
| پین 44 | NC — Not connected (per datasheet) |
کاربردهای معمول
PIC17C42AT-16E/PT مناسب است برای 6 کاربردs: Industrial Control Logic, Legacy Embedded Systems, Motor Control Front-End, Instrumentation Front Panel, Consumer Electronics (1990s-era), Automotive Under-hood Modules.
Industrial Control Logic
The PIC17C42AT-16E/PT fits industrial control logic applications through its 33 I/O pins, 16MHz RISC execution rate (4MHz instruction cycle), and -40C to +125C Extended temperature grade. The 4KB OTP EPROM is sufficient for relay sequencing, sensor scanning, and limit-check routines typical of PLCs and process controllers. Place the MCU between the 24V field bus and 5V logic, with opto-isolation on each I/O to meet industrial surge immunity; the 232-byte RAM holds transient state for the control loop.
پیشنهادی
Legacy Embedded Systems
The PIC17C42AT-16E/PT maintains installed-base legacy embedded systems where firmware is locked in OTP EPROM and the 44-TQFP footprint is already on the board. Its 8-level hardware stack, 16-bit instruction word, and 8-bit data path match the original 1990s firmware binaries without recompilation. Substituting a modern flash MCU would require full firmware rewrite; keeping this part preserves the original control algorithm bit-for-bit.
پیشنهادی
Motor Control Front-End
The PIC17C42AT-16E/PT's 16MHz clock and 33 I/O pins are sufficient for stepper-motor and DC-brush motor commutation front-ends, including Hall-sensor input, PWM output, and current-limit interrupts. The 232-byte RAM holds trapezoidal-velocity profiles, while the 4KB EPROM fits the commutation table and fault-recovery state machine. Drive the H-bridge directly from the I/O pins via gate drivers; the Extended temp grade supports motor ambient heat.
پیشنهادی
Instrumentation Front Panel
The PIC17C42AT-16E/PT fits instrumentation front-panel controllers, scanning key matrices, driving LED or 7-segment displays, and reading rotary encoders through its 33 I/O. The 4KB EPROM fits display lookup tables and encoder debounce state machines, while the 16MHz clock debounces 16 keys in a single 8ms scan. The Extended -40C to +125C grade handles lab oven and field-instrument temperatures.
پیشنهادی
Consumer Electronics (1990s-era)
The PIC17C42AT-16E/PT originally targeted cost-sensitive consumer electronics including washing-machine controllers, microwave-oven interfaces, and HVAC thermostat logic in the mid-1990s. The OTP EPROM is acceptable for high-volume consumer SKUs where firmware is frozen and per-unit cost dominates. The 33 I/O drive relays, keypads, and LED displays directly; the 232-byte RAM handles menu state for the user interface.
پیشنهادی
Automotive Under-hood Modules
The PIC17C42AT-16E/PT Extended -40C to +125C temperature grade and 44-TQFP package are suitable for automotive under-hood modules such as engine auxiliaries, sensor clusters, and lighting controllers, though lacking formal AEC-Q100 qualification. The 16MHz clock provides deterministic loop times for sensor sampling, and 33 I/O connect to LIN or CAN transceivers, Hall sensors, and driver LEDs.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC17C42AT-16E/PT — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC17C42A-16E/P | PIC17C42A-25/PT | PIC17C42A-33I/PT | PIC17C42A-33I/PQ | PIC17C42AT-16I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (PT) | 40-PDIP (P) - NOT same footprint | 44-TQFP (PT) - same | 44-TQFP (PT) - same | 44-MQFP (PQ) - verify pinout | 44-TQFP (PT) - same |
| Program Memory | 4KB (2K x 16) OTP EPROM | 4KB OTP EPROM | 4KB OTP EPROM | 4KB OTP EPROM | 4KB OTP EPROM | 4KB OTP EPROM |
| RAM | 232 bytes | 232 bytes | 232 bytes | 232 bytes | 232 bytes | 232 bytes |
| Max Clock Frequency | 16 MHz | 16 MHz | 25 MHz | 33 MHz | 33 MHz | 16 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
تفاوت‌های کلیدی
- Extended -40C to +125C temperature grade (در مقابلPIC17C42AT-16I/PT)
- Original baseline 16MHz clock speed (در مقابلPIC17C42A-33I/PT)
- 44-TQFP surface-mount package (در مقابلPIC17C42A-16E/P)
یادداشت‌های طراحی
PIC17C42AT-16E/PT is OTP (one-time-programmable) EPROM - there is no field-update path. Verify all firmware revisions through windowed ceramic parts (PIC17C42A-*/JW) before committing to OTP production units. Per Microchip PIC17C42A Rev. A silicon errata, several peripheral control registers have documented clarifications against the preliminary datasheet DS30412C; consult the errata document before finalizing register definitions.
Operating supply voltage is 4.5V to 5.5V (5V typical). Place a 100nF ceramic decoupling capacitor within 5mm of each VDD pin (pins 8 and 41) and a 10uF bulk tantalum or ceramic at the regulator output. Estimated: at 16MHz clock and all 33 I/O toggling, the device draws approximately 25-40 mA; verify with a multimeter on the VDD rail during firmware bring-up to catch firmware-induced current spikes early.
The 44-TQFP (PT) package dissipates heat through the lead frame to PCB copper pours. For the Extended -40C to +125C temperature grade, ensure at least 100 sq mm of unbroken GND copper under the package, connected to the VSS pins (7 and 42) with multiple thermal vias. Estimated: theta_JA on a 4-layer JEDEC test board is approximately 50 C/W; at 35 mA and 5V the part dissipates ~175 mW, yielding a junction rise of ~9 C above ambient - well within the 125 C upper limit.
Route the external oscillator traces (OSC1, OSCC2) as short as possible, surrounded by a GND guard ring, to minimize EMI coupling. Place the oscillator crystal within 5mm of the OSC pins and add a 1M ohm parallel bias resistor across the crystal per Microchip PIC17C4X datasheet DS30412C. Avoid routing high-frequency signals or relay-switching traces under or near the oscillator to prevent clock jitter.
The 16-bit external data bus (RD0-RD7, RE0-RE2) shares pins with the parallel port functions. Per the PIC17C4X preliminary datasheet, configure the bus mode registers before enabling external memory access; otherwise I/O contention can occur. Add 10k pull-up resistors on unused bus lines to prevent floating CMOS inputs during reset or bus-hold conditions.
اطلاعات انطباق
PIC17C42AT-16E/PT is a 1990s-era legacy part; specific lot compliance (RoHS, lead-free) must be verified from the date code and original manufacturer documentation. No AEC-Q100 automotive qualification is documented for the PIC17C42A family; AEC-Q100 grade MCUs from Microchip include PIC18F and dsPIC33 families.
