PIC17C756AT-33I/L - 33MHz 8-Bit OTP MCU, 32KB, 50 I/O | Microchip
MPN: PIC17C756AT-33I/L ⚠ Lần mua cuốiPIC17C756AT-33I/L Tóm tắt
A microcontroller (MCU) is an integrated circuit that combines a CPU core, non-volatile program memory, working RAM, and a set of on-chip peripherals behind a unified instruction set, allowing a single chip to replace dozens of discrete logic devices. The PIC17C family sits between Microchip's baseline PIC16C5X/PIC16CXX devices and the later PIC18F parts, adding a 16-bit-wide instruction word (which yields 32KB of code space from a single OTP array) while keeping an 8-bit data path and only 58 single-word instructions to learn. This positioning explains why PIC17C756A-series parts are still specified in long-lifecycle industrial designs even after the family was officially replaced by the PIC18F6520.
Key features of the PIC17C756AT-33I/L include 50 programmable digital I/O lines, 12 channels of 10-bit Analog-to-Digital conversion, a single-cycle 8-bit hardware multiplier, dual hardware PWM/Capture/Compare modules, an asynchronous serial port (USART), a synchronous serial port (SSP) for SPI/I2C, and a wide 4.5V to 5.5V supply range suited to industrial 5V rails. The /L suffix denotes the 68-pin PLCC (Plastic Leaded Chip Carrier, J-leaded, 24.23 x 24.23 mm) surface-mount package, and the /I industrial temperature grade spans -40C to +85C.
Architecturally, the PIC17C756A uses a RISC-style Harvard bus with separate program and data paths, an internal instruction pipeline, and an 8-level deep hardware stack, which together enable deterministic 121 ns instruction cycles except for two-cycle program branches and table reads/writes. The on-chip peripherals are mapped into the SFR space, and the 10-bit ADC includes dedicated sample-and-hold and programmable acquisition timing.
Typical applications include industrial automation controllers, motor control front-ends, instrumentation front panels, automotive body electronics (where the part was historically qualified in non-AEC-Q100 designs), HVAC control boards, and legacy embedded products that were designed around the PIC17C family before migrating to PIC18F. The combination of 50 I/O, 12 ADC channels, and a 5V-tolerant architecture makes it a frequent choice for sensor aggregation nodes.
When designing with this part, allow at least a 2-layer board with a solid ground pour under the PLCC footprint and place a 0.1 uF decoupling capacitor on every VDD/VSS pair. Because the device is OTP rather than flash, the firmware must be fully validated before programming - in-circuit reprogramming is not possible.
This page synthesizes current distributor stock, parametric cross-references, and application guidance for engineers who still need to source or design around the PIC17C756A family.
Bộ thay thế dễ dàng lắp đặt cho PIC17C756AT-33I/L — 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 PIC17C756AT-33I/L (cùng hình factor và footprint) — khác nhau ở Core Architecture, Package, Data Bus Width, Program Memory Type, Operating Temperature.
PIC17C756A-33I/L
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PIC17C756AT-33I/L024
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C756AT-33I/CL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C756AT-33E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C756AT-33I/L
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Xem tài liệu →PIC17C756AT-33I/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC17C, 8-bit RISC (Harvard) |
| Instruction Word Width | 16-bit |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 32 KB (16K x 16) |
| Data RAM | 902 bytes |
| Tần số xung maksimum | 33 MHz |
| Instruction Cycle Time | 121 ns (single-cycle, except branches/table reads) |
| Throughput | 8.25 MIPS |
| Supply Voltage (VDD) | 4.5 V to 5.5 V |
| I/O Pins | 50 programmable digital I/O |
| ADC | 12 channels x 10-bit |
| Hardware Multiplier | 8 x 8 single-cycle |
| PWM / CCP Modules | Dual Capture/Compare/PWM |
| Serial Interfaces | USART (async) + SSP (SPI / I2C) |
| Hộp | 68-pin PLCC (LCC-68), J-lead, 24.23 x 24.23 mm |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial / 'I' grade) |
| Kiểu lắp đặt | Surface Mount (PLCC socket compatible) |
| Trạng thái RoHS | Not RoHS compliant (PLCC with matte-tin/lead finish historically) |
| Instruction Set | 58 single-word instructions |
Cấu hình chân PIC17C756AT-33I/L
| Chân 1 | MCLR — Master Clear (Reset) input, active low |
| Chân 2 | OSC1 — Crystal oscillator / clock input |
| Chân 3 | OSC2 — Crystal oscillator output |
| Chân 4 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Chân 5 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Chân 6 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Chân 7 | RA3/AN3 — Port A bit 3 / Analog input 3 |
| Chân 8 | RA4/AN4 — Port A bit 4 / Analog input 4 |
| Chân 9 | RA5/AN5 — Port A bit 5 / Analog input 5 |
| Chân 10 | AVDD — Analog VDD supply |
| Chân 11 | AVSS — Analog VSS ground |
| Chân 12 | VSS — Digital ground |
| Chân 13 | VDD — Digital supply |
| Chân 14 | RB0/INT — Port B bit 0 / External interrupt |
| Chân 15 | RB1 — Port B bit 1 |
| Chân 16 | RB2 — Port B bit 2 |
| Chân 17 | RB3 — Port B bit 3 |
| Chân 18 | RB4 — Port B bit 4 |
| Chân 19 | RB5 — Port B bit 5 |
| Chân 20 | RB6 — Port B bit 6 |
| Chân 21 | RB7 — Port B bit 7 |
| Chân 22 | VSS — Digital ground |
| Chân 23 | VDD — Digital supply |
| Chân 24 | RC0 — Port C bit 0 / CCP1 |
| Chân 25 | RC1 — Port C bit 1 / CCP2 |
| Chân 26 | RC2 — Port C bit 2 |
| Chân 27 | RC3 — Port C bit 3 / SCL (SSP) |
| Chân 28 | RC4 — Port C bit 4 / SDA (SSP) |
| Chân 29 | RC5 — Port C bit 5 / SDO (SSP) |
| Chân 30 | RC6 — Port C bit 6 / TX (USART) |
| Chân 31 | RC7 — Port C bit 7 / RX (USART) |
| Chân 32 | VSS — Digital ground |
| Chân 33 | VDD — Digital supply |
| Chân 34 | RD0 — Port D bit 0 |
| Chân 35 | RD1 — Port D bit 1 |
| Chân 36 | RD2 — Port D bit 2 |
| Chân 37 | RD3 — Port D bit 3 |
| Chân 38 | RD4 — Port D bit 4 |
| Chân 39 | RD5 — Port D bit 5 |
| Chân 40 | RD6 — Port D bit 6 |
| Chân 41 | RD7 — Port D bit 7 |
| Chân 42 | VSS — Digital ground |
| Chân 43 | VDD — Digital supply |
| Chân 44 | RE0/AN6 — Port E bit 0 / Analog input 6 |
| Chân 45 | RE1/AN7 — Port E bit 1 / Analog input 7 |
| Chân 46 | RE2/AN8 — Port E bit 2 / Analog input 8 |
| Chân 47 | RE3/AN9 — Port E bit 3 / Analog input 9 |
| Chân 48 | RE4/AN10 — Port E bit 4 / Analog input 10 |
| Chân 49 | RE5/AN11 — Port E bit 5 / Analog input 11 |
| Chân 50 | VSS — Digital ground |
| Chân 51 | VDD — Digital supply |
| Chân 52 | RF0 — Port F bit 0 |
| Chân 53 | RF1 — Port F bit 1 |
| Chân 54 | RF2 — Port F bit 2 |
| Chân 55 | RF3 — Port F bit 3 |
| Chân 56 | RF4 — Port F bit 4 |
| Chân 57 | RF5 — Port F bit 5 |
| Chân 58 | RF6 — Port F bit 6 |
| Chân 59 | RF7 — Port F bit 7 |
| Chân 60 | VSS — Digital ground |
| Chân 61 | VDD — Digital supply |
| Chân 62 | RG0 — Port G bit 0 |
| Chân 63 | RG1 — Port G bit 1 |
| Chân 64 | RG2 — Port G bit 2 |
| Chân 65 | RG3 — Port G bit 3 |
| Chân 66 | RG4 — Port G bit 4 |
| Chân 67 | T0CKI — Timer 0 clock input |
| Chân 68 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC17C756AT-33I/L phù hợp cho 7 Áp dụngs: Industrial Automation Controllers, Motor Control Front-End, Instrumentation Front Panels, HVAC Control Boards, Sensor Aggregation Nodes, Legacy Embedded Maintenance, Automotive Body Electronics (Legacy).
Industrial Automation Controllers
The PIC17C756AT-33I/L's 50 programmable I/O lines, 12-channel 10-bit ADC, and dual Capture/Compare/PWM peripherals make it well-suited to industrial automation controllers that aggregate sensors and drive actuators from a single 5V rail. Its 8.25 MIPS throughput and 121 ns instruction cycle are sufficient for PID loops sampled at sub-millisecond rates, while the 32 KB OTP code space accommodates ladder-logic-equivalent C state machines. The 4.5V to 5.5V supply range aligns with legacy 24V industrial backplanes that regulate down to 5V.
Được đề xuất
Motor Control Front-End
With dual PWM/CCP modules, an 8-bit hardware multiplier (single-cycle), and the 10-bit ADC's 12 analog inputs, the PIC17C756AT-33I/L can implement sensored or sensorless motor control for low- to mid-power BLDC, brushed DC, and stepper drives. The 33 MHz / 8.25 MIPS throughput supports trapezoidal commutation loops up to tens of kHz. Engineers should note that for higher-performance vector control, migration to a dsPIC33 part (e.g., DSPIC33EP64MC504) is recommended.
Được đề xuất
Instrumentation Front Panels
The PIC17C756AT-33I/L integrates the CPU, code memory, RAM, ADC, and serial interfaces required to drive instrumentation front panels that combine a 7-segment or character-LCD display with pushbuttons and analog sensor inputs. Its USART (async) and SSP (SPI/I2C) peripherals simplify interfacing to backplane MCUs, display controllers, and digital sensors. The wide 5V tolerance and industrial -40C to +85C range suit benchtop and rack-mounted test equipment.
Được đề xuất
HVAC Control Boards
HVAC control boards typically require multiple analog inputs (temperature, pressure, humidity transducers), digital outputs for relays and triac drivers, and serial communications for building-automation backbones - exactly the role profile of the PIC17C756AT-33I/L. Its 12 ADC channels cover multiple thermistor/sensor inputs, while 50 I/O drive fans, dampers, and triacs. The 5V operation and -40C to +85C industrial range match typical equipment-room environments.
Được đề xuất
Sensor Aggregation Nodes
As a sensor aggregation node in legacy distributed I/O systems, the PIC17C756AT-33I/L reads multiple analog and digital sensors, performs local averaging/threshold processing in its 902-byte RAM, and reports results via USART or SSP. The 32 KB OTP code space supports simple MODBUS-RTU or vendor-proprietary protocols. The part's deterministic 121 ns instruction cycle makes it well-suited to time-stamped data acquisition where jitter must be minimized.
Được đề xuất
Legacy Embedded Maintenance
The PIC17C756AT-33I/L remains in use for service and spare-part replacement of fielded industrial and medical equipment that was designed around the PIC17C family in the late 1990s. With Microchip now in last-time-buy for this part, EOL planning requires identifying pin-compatible variants (PIC17C756AT-33E/L for higher temp, PIC17C756A-33I/L for non-T&R) and modern replacements (PIC18F6520) for board redesigns. Functional testing must verify ADC linearity and I/O timing against the original design's qualification data.
Được đề xuất
Automotive Body Electronics (Legacy)
Some legacy automotive body-electronics modules were designed around the PIC17C756A in the late 1990s and early 2000s. While the part is not AEC-Q100 qualified, it was deployed in cabin-mounted modules with relaxed thermal and qualification requirements. The 50 I/O and 12 ADC channels support multi-zone lighting control, seat/mirror positioning, and HVAC blend-door control. New automotive designs must use AEC-Q100-qualified parts such as PIC18F46K22 or dsPIC33EV parts.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C756AT-33I/L — 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 | PIC17C756A-33I/L | PIC17C756AT-33I/L024 | PIC17C756AT-33I/CL | PIC17C756AT-33E/L |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 68-pin PLCC (LCC-68) | 68-pin PLCC (LCC-68) - same | 68-pin PLCC (LCC-68) - same | 68-pin PLCC (LCC-68), ceramic windowed - same | 68-pin PLCC (LCC-68) - same |
| Program Memory | 32 KB (16K x 16) OTP | 32 KB OTP - same | 32 KB OTP - same | 32 KB EPROM (windowed) | 32 KB OTP - same |
| RAM | 902 bytes | 902 bytes - same | 902 bytes - same | 902 bytes - same | 902 bytes - same |
| Maximum Clock | 33 MHz | 33 MHz - same | 33 MHz - same | 33 MHz - same | 33 MHz - same |
| I/O Pins | 50 | 50 - same | 50 - same | 50 - same | 50 - same |
| ADC Channels | 12 x 10-bit | 12 x 10-bit - same | 12 x 10-bit - same | 12 x 10-bit - same | 12 x 10-bit - same |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C - same | -40C to +85C - same | -40C to +85C - same | -40C to +125C (Extended) |
| Memory Type | OTP (one-time programmable) | OTP - same | OTP - same | Windowed EPROM (UV-erasable, prototype/debug) | OTP - same |
Bảo phân biệt quan trọng
- Industrial temperature range with same silicon as E/L variant (vsPIC17C756AT-33E/L)
- OTP rather than windowed EPROM (vsPIC17C756AT-33I/CL)
- Pin-compatible with the broader PIC17C family migration path (vsPIC18F6520)
Ghi chú thiết kế
Decouple every VDD/VSS pair on the 68-pin PLCC with a 100 nF X7R ceramic placed as close to the package pin as possible; add a single 10 uF bulk tantalum or aluminum-polymer capacitor at the board's 5V entry. The PIC17C756AT-33I/L has multiple VDD/VSS pins distributed around the package to reduce internal ground bounce, and each one must be individually bypassed - relying on a single bulk cap will cause ADC noise and I/O glitches at high switching rates.
Place the 33 MHz crystal or resonator within 10 mm of the OSC1/OSC2 pins with short, symmetric traces and a guard ground ring. Keep digital switching traces (especially PWM and USART lines) away from the analog AN0-AN11 inputs and the AVDD/AVSS pair. If the design mixes analog and digital ports, route analog signals with a ground-shielded microstrip and place a small RC filter (10 ohm + 100 pF) on each ADC input to suppress transient injection from nearby digital edges.
Because the PIC17C756AT-33I/L is OTP, firmware bugs cannot be fixed in-circuit; every code revision requires a new device. Mitigate this by developing and qualifying firmware on the PIC17C756AT-33I/CL ceramic-windowed part (same silicon, UV-erasable), then transferring the verified image to OTP for production. Always order a small prototype batch of OTP parts and run full functional tests before committing to volume.
Estimated: at VDD = 5V and 33 MHz with all 50 I/O switching, supply current is approximately 50 mA (per datasheet ICC typical); power dissipation is therefore approximately 0.25 W, well within the 68-PLCC's thermal envelope (theta_JA around 50 C/W). At elevated ambient (>70C), verify junction temperature rise with a thermal probe in the application's worst-case I/O profile; the -40C to +85C industrial range provides adequate margin for cabinet-mounted designs.
Thông tin tuân thủ
68-pin PLCC package historically uses SnPb (tin-lead) finish and is not RoHS compliant; PIC17C756A family is not AEC-Q100 qualified. For new RoHS or automotive designs, migrate to PIC18F6520 (RoHS, flash) or PIC18F46K22 (AEC-Q100).
