PIC17C42AT-16E/PT - 8-bit OTP MCU, 4KB EPROM, 16MHz, 44-TQFP | Microchip
MPN: PIC17C42AT-16E/PT ✗ Cuối đờiPIC17C42AT-16E/PT Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho PIC17C42AT-16E/PT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC17C42AT-16E/PT (cùng hình factor và footprint) — khác nhau ở Operating Temperature Range, Packaging, Oscillator Type, Program Memory Size, RAM Size.
PIC17C42A-16E/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42A-25/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42A-33I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C42A-33I/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42AT-16I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C42AT-16E/PT Tỷ lệ tối đa & tính chất điện
| 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 |
| Tần số xung maksimum | 16 MHz |
| Instruction Word Width | 16 bits |
| Bề rộng đường dữ liệu | 8 bits |
| Address Bus Width | 16 bits |
| Oscillator Type | External |
| Điện áp cung cấp | 4.5 V to 5.5 V |
| Nhiệt độ hoạt động | -40 C to +125 C (Extended grade) |
| Hộp / Vỏ | 44-TQFP (PT), 0.80 mm pitch |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Hardware Stack Levels | 8 |
| Silicon Revision | Rev. A (errata against DS30412C) |
| Process Technology | CMOS |
Cấu hình chân PIC17C42AT-16E/PT
| Chân 1 | OSC1 — External oscillator input |
| Chân 2 | RA0/INT — Port A bit 0 / external interrupt |
| Chân 3 | RA1 — Port A bit 1 |
| Chân 4 | RA2 — Port A bit 2 |
| Chân 5 | RA3 — Port A bit 3 |
| Chân 6 | RA4 — Port A bit 4 / T0CKI |
| Chân 7 | VSS — Ground reference |
| Chân 8 | VDD — Positive supply (5V typical) |
| Chân 9 | RB0 — Port B bit 0 |
| Chân 10 | RB1 — Port B bit 1 |
| Chân 11 | RB2 — Port B bit 2 |
| Chân 12 | RB3 — Port B bit 3 |
| Chân 13 | RB4 — Port B bit 4 |
| Chân 14 | RB5 — Port B bit 5 |
| Chân 15 | RB6 — Port B bit 6 |
| Chân 16 | RB7 — Port B bit 7 |
| Chân 17 | RC0 — Port C bit 0 |
| Chân 18 | RC1 — Port C bit 1 |
| Chân 19 | RC2 — Port C bit 2 |
| Chân 20 | RC3 — Port C bit 3 |
| Chân 21 | RC4 — Port C bit 4 |
| Chân 22 | RC5 — Port C bit 5 |
| Chân 23 | RC6 — Port C bit 6 |
| Chân 24 | RC7 — Port C bit 7 |
| Chân 25 | RD0 — Port D bit 0 / external data bus |
| Chân 26 | RD1 — Port D bit 1 / external data bus |
| Chân 27 | RD2 — Port D bit 2 / external data bus |
| Chân 28 | RD3 — Port D bit 3 / external data bus |
| Chân 29 | RD4 — Port D bit 4 / external data bus |
| Chân 30 | RD5 — Port D bit 5 / external data bus |
| Chân 31 | RD6 — Port D bit 6 / external data bus |
| Chân 32 | RD7 — Port D bit 7 / external data bus |
| Chân 33 | RE0 — Port E bit 0 / external data bus high |
| Chân 34 | RE1 — Port E bit 1 / external data bus high |
| Chân 35 | RE2 — Port E bit 2 / external data bus high |
| Chân 36 | NC — Not connected (per datasheet) |
| Chân 37 | NC — Not connected (per datasheet) |
| Chân 38 | MCLR — Master clear (reset) input |
| Chân 39 | OSC2 — Oscillator output or external clock input |
| Chân 40 | T0CKI — Timer 0 external clock input (legacy naming) |
| Chân 41 | VDD — Positive supply (5V typical, second pin) |
| Chân 42 | VSS — Ground reference (second pin) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC17C42AT-16E/PT phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C42AT-16E/PT — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Extended -40C to +125C temperature grade (vsPIC17C42AT-16I/PT)
- Original baseline 16MHz clock speed (vsPIC17C42A-33I/PT)
- 44-TQFP surface-mount package (vsPIC17C42A-16E/P)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
