PIC17LC756AT-08/L - 8-bit 8MHz 32KB OTP MCU 68-PLCC | Microchip
MPN: PIC17LC756AT-08/L ✗ Cuối đờiPIC17LC756AT-08/L Tóm tắt
An 8-bit microcontroller is a single-chip computer built around an 8-bit data bus, an ALU, on-chip program and data memory, and a set of integrated peripherals. In the wider semiconductor taxonomy, the PIC17C family sits between Microchip's PIC16 mid-range and PIC18 enhanced cores. As a member of the legacy PIC17 architecture, the PIC17LC756AT-08/L is one of the highest-performance 8-bit PICs ever produced, executing most instructions in a single 121 ns cycle at 33 MHz MIPS-class throughput, with a RISC instruction set of only 58 single-word instructions.
Key features include a 16-bit instruction word (16K x 16 program memory), an integrated 10-bit ADC, dual analog comparators, a USART, an MSSP module supporting both I2C and SPI, four timer/counter modules, and up to 50 digital I/O pins. The LC suffix indicates the low-voltage CMOS variant, supporting operation from 2.5 V to 5.5 V, making it suitable for both 3.3 V and 5 V system designs.
The PIC17C architecture is a true 16-bit-enhanced 8-bit core, featuring a 16-bit wide instruction path with an 8-bit data path. The OTP program memory is programmed once and is non-erasable, which makes the PIC17LC756AT-08/L well suited to high-volume production where cost per unit matters more than field re-programmability. Three power-management modes (RUN, IDLE, SLEEP) allow designers to trade off performance versus quiescent current in battery-powered applications.
Typical applications include industrial control systems, embedded instrumentation, motor control front-ends, multi-channel data acquisition, and legacy appliance controllers. The high I/O count (50 I/O lines) and integrated ADC make it useful for systems that previously required external logic or a discrete ADC, while the integrated communication peripherals reduce BOM cost.
When designing with this device, ensure the PLCC-68 socket or footprint is allocated on the PCB, since this package is now considered a legacy form factor; designers should also plan for OTP programming via Microchip's PRO MATE II or equivalent device programmer during production. The 2.5 V minimum supply voltage allows direct connection to 2- or 3-cell battery stacks without a boost regulator.
This page synthesizes distributor pricing, drop-in same-package alternatives (PIC17LC756AT-08I/L, PIC17C756AT-33I/L), and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC17LC756AT-08/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 PIC17LC756AT-08/L (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Type, ADC, Core Architecture, I/O Pins.
PIC17LC756AT-08I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C756AT-33I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C756AT-33E/L
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC17C756AT-16/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17LC756AT-08/L Tỷ lệ tối đa & tính chất điện
| Core | PIC17 8-bit RISC |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 902 bytes |
| Maximum CPU Speed | 8 MHz |
| Instruction Cycle Time | 121 ns (single cycle, except branches) |
| Bề rộng đường dữ liệu | 16-bit instruction / 8-bit data |
| Điện áp cung cấp | 2.5 V to 5.5 V |
| I/O Pins | 50 |
| ADC | 10-bit integrated |
| Comparators | 2 analog comparators |
| Communication Interfaces | UART/USART, I2C, SPI (MSSP) |
| Timers | 4 timer/counter modules |
| Power-Saving Modes | RUN, IDLE, SLEEP |
| Hộp | 68-pin PLCC (J-Lead, 24.23 x 24.23 mm) |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân PIC17LC756AT-08/L
| Chân 1 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Chân 2 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Chân 3 | RA2/AN2 — Port A bit 2 / analog input 2 |
| Chân 4 | RA3/AN3 — Port A bit 3 / analog input 3 |
| Chân 5 | RA4/AN4 — Port A bit 4 / analog input 4 |
| Chân 6 | RA5/AN5 — Port A bit 5 / analog input 5 |
| Chân 7 | RA6/AN6 — Port A bit 6 / analog input 6 |
| Chân 8 | RA7/AN7 — Port A bit 7 / analog input 7 |
| Chân 9 | VSS — Ground reference |
| Chân 10 | RA8/AN8 — Port A bit 8 / analog input 8 |
| Chân 11 | RA9/AN9 — Port A bit 9 / analog input 9 |
| Chân 12 | RA10/AN10 — Port A bit 10 / analog input 10 |
| Chân 13 | RA11/AN11 — Port A bit 11 / analog input 11 |
| Chân 14 | VDD — Positive supply voltage |
| Chân 15 | OSC1/CLKIN — Oscillator input / external clock in |
| Chân 16 | OSC2/CLKOUT — Oscillator output / clock out |
| Chân 17 | RB0/INT0 — Port B bit 0 / external interrupt 0 |
| Chân 18 | RB1/INT1 — Port B bit 1 / external interrupt 1 |
| Chân 19 | RB2/INT2 — Port B bit 2 / external interrupt 2 |
| Chân 20 | RB3/INT3 — Port B bit 3 / external interrupt 3 |
| Chân 21 | RB4 — Port B bit 4 |
| Chân 22 | RB5 — Port B bit 5 |
| Chân 23 | RB6 — Port B bit 6 |
| Chân 24 | RB7 — Port B bit 7 |
| Chân 25 | VSS — Ground reference |
| Chân 26 | RC0 — Port C bit 0 |
| Chân 27 | RC1 — Port C bit 1 |
| Chân 28 | RC2 — Port C bit 2 |
| Chân 29 | RC3 — Port C bit 3 |
| Chân 30 | RD0 — Port D bit 0 |
| Chân 31 | RD1 — Port D bit 1 |
| Chân 32 | RD2 — Port D bit 2 |
| Chân 33 | RD3 — Port D bit 3 |
| Chân 34 | RD4 — Port D bit 4 |
| Chân 35 | RD5 — Port D bit 5 |
| Chân 36 | RD6 — Port D bit 6 |
| Chân 37 | RD7 — Port D bit 7 |
| Chân 38 | VSS — Ground reference |
| Chân 39 | RC4 — Port C bit 4 |
| Chân 40 | RC5 — Port C bit 5 |
| Chân 41 | RC6 — Port C bit 6 |
| Chân 42 | RC7 — Port C bit 7 |
| Chân 43 | RE0 — Port E bit 0 |
| Chân 44 | RE1 — Port E bit 1 |
| Chân 45 | RE2 — Port E bit 2 |
| Chân 46 | MCLR — Master clear / reset input |
| Chân 47 | VDD — Positive supply voltage |
| Chân 48 | RF0 — Port F bit 0 |
| Chân 49 | RF1 — Port F bit 1 |
| Chân 50 | RF2 — Port F bit 2 |
| Chân 51 | RF3 — Port F bit 3 |
| Chân 52 | RF4 — Port F bit 4 |
| Chân 53 | RF5 — Port F bit 5 |
| Chân 54 | RF6 — Port F bit 6 |
| Chân 55 | RF7 — Port F bit 7 |
| Chân 56 | RG0 — Port G bit 0 |
| Chân 57 | RG1 — Port G bit 1 |
| Chân 58 | RG2 — Port G bit 2 |
| Chân 59 | RG3 — Port G bit 3 |
| Chân 60 | VSS — Ground reference |
| Chân 61 | TX/CK — USART asynchronous transmit / synchronous clock |
| Chân 62 | RX/DT — USART asynchronous receive / synchronous data |
| Chân 63 | SCL/SCK — I2C clock / SPI clock (MSSP) |
| Chân 64 | SDA/SDI — I2C data / SPI data in (MSSP) |
| Chân 65 | SDO — SPI data out (MSSP) |
| Chân 66 | SS — SPI slave select (MSSP) |
| Chân 67 | VDD — Positive supply voltage |
| Chân 68 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC17LC756AT-08/L phù hợp cho 6 Áp dụngs: Industrial Process Controllers, Embedded Instrumentation & Data Acquisition, Motor Control Front-End, Legacy Appliance & HVAC Control Boards, Automotive Body Electronics (Legacy Modules), Point-of-Sale & Vending Terminals.
Industrial Process Controllers
The PIC17LC756AT-08/L fits industrial process controllers thanks to its 50 I/O lines, integrated 10-bit ADC, dual analog comparators, and 2.5 V-5.5 V supply range that directly interfaces 24 V-derived 5 V rails. Placed as the central supervisory MCU, it scans keypad inputs, drives relay outputs, and reads multiple analog sensor channels without external ADC ICs. Compared with newer PIC18F parts, the PIC17LC756AT-08/L offers a mature instruction set that legacy control firmware can be ported onto with minimal rework.
Được đề xuất
Embedded Instrumentation & Data Acquisition
The PIC17LC756AT-08/L's integrated 10-bit ADC and dual analog comparators make it a natural fit for embedded instrumentation and multi-channel data-acquisition front-ends. With 902 bytes of RAM and the MSSP peripheral supporting SPI or I2C, the MCU can stream digitized samples to external sensors or non-volatile memory. Operating from 2.5 V allows direct battery-derived supply, while 50 I/O lines simplify front-panel switch matrices. The single-cycle 121 ns instruction throughput supports up to 8 MHz control-loop execution.
Được đề xuất
Motor Control Front-End
The PIC17LC756AT-08/L is well suited to motor-control front-end tasks such as BLDC commutation logic, stepper sequencing, or sensor monitoring around an external power-stage. The integrated comparators enable back-EMF zero-crossing detection, while the four hardware timers provide PWM edge generation and tachometer capture. Operating from 2.5 V-5.5 V simplifies interface to 3.3 V gate drivers, and the 50 I/O lines leave headroom for limit-switch inputs and fault-flag outputs. The 121 ns single-cycle instruction supports 8 MHz deterministic loop rates for safety-critical sequencing.
Được đề xuất
Legacy Appliance & HVAC Control Boards
White-goods and HVAC controller boards that were designed around the PIC17 family continue to use the PIC17LC756AT-08/L as a drop-in service replacement. The MCU drives triac-fired loads, reads thermistor or 4-20 mA sensor inputs via the 10-bit ADC, and communicates to indoor/outdoor units through the integrated USART. The OTP memory model fits the high-volume, low-cost, fixed-firmware nature of appliance production. The 68-PLCC package fits standard through-hole or socketed footprints on legacy boards.
Được đề xuất
Automotive Body Electronics (Legacy Modules)
Although the PIC17LC756AT-08/L is not AEC-Q100 qualified, it has historically been used in non-safety automotive body-electronics modules such as interior lighting, seat controllers, and accessory interfaces where its 50 I/O pins and integrated peripherals replaced external glue logic. The 2.5 V-5.5 V supply range tolerates cranking transients in 12 V vehicle systems, and the 8 MHz CPU handles simple LIN-style communication via the USART plus a software bit-bang layer. For new automotive designs, Microchip recommends dsPIC33 or PIC18 K-series parts with AEC-Q100 qualification.
Được đề xuất
Point-of-Sale & Vending Terminals
Point-of-sale terminals, vending machines, and ticket dispensers that require multiple key-scanning matrices, coin/bill acceptor interfaces, and serial communications to back-office servers are well served by the PIC17LC756AT-08/L. The 50 I/O lines handle 8x8 key matrices without external I/O expanders, and the integrated USART plus MSSP (I2C/SPI) connect to peripheral devices such as displays, EEPROMs, and bill validators. The 2.5 V minimum supply lets the design share a regulated 3.3 V rail with LCD modules. Designers should plan for OTP programming via socketed adapters during production.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17LC756AT-08/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 | PIC17LC756AT-08I/L | PIC17C756AT-33I/L | PIC17C756AT-33E/L | PIC17C756AT-16/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 68-pin PLCC (24.23 x 24.23 mm) | 68-pin PLCC (same) | 68-pin PLCC (same) | 68-pin PLCC (same) | 68-pin TQFP (PT) |
| Maximum Clock Speed | 8 MHz | 8 MHz | 33 MHz | 33 MHz | 16 MHz |
| Program Memory | 32 KB OTP (16K x 16) | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP |
| RAM Size | 902 bytes | 902 bytes | 902 bytes | 902 bytes | 902 bytes |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| I/O Pins | 50 | 50 | 50 | 50 | 50 |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND |
Bảo phân biệt quan trọng
- Wide 2.5 V-5.5 V supply range on the LC variant (vsPIC17C756AT-33I/L)
- Lower quiescent current for battery-friendly designs (vsPIC17C756AT-33I/L)
- Mature 8-bit PIC17 architecture with single-cycle instructions (vsPIC16LF877A-I/P)
Ghi chú thiết kế
Estimated: at VDD = 5.0 V and an active CPU + ADC, the PIC17LC756AT-08/L draws roughly 15-25 mA depending on oscillator configuration and peripheral enable bits. Place a 0.1 uF ceramic decoupling capacitor close to each VDD pin (pins 14, 47, 67) and a bulk 10 uF tantalum or aluminum-polymer cap on the main 5 V rail. The three VSS pins (9, 25, 38, 60) should each connect to a low-impedance ground plane to handle return currents.
The 68-PLCC land pattern is defined by JEDEC MS-018 with 1.27 mm pitch J-leads. Allow at least 0.5 mm clearance under the package for socket compatibility, or use a low-profile PLCC socket (e.g. Yamaichi or Aries) for field-replaceable designs. Keep high-speed digital traces (USART, MSSP) short and route them over a continuous ground reference to minimize crosstalk with the analog AN0-AN11 inputs.
Because the PIC17LC756AT-08/L uses OTP memory, firmware bugs cannot be patched in-circuit. Always program samples on a PRO MATE II or equivalent before committing to high-volume runs, and verify code with a windowed PIC17C756A JW device during development. Designers should also confirm the MCLR pin (pin 46) has a proper 10 kohm pull-up and a decoupling capacitor; a floating MCLR causes erratic resets in noisy industrial environments.
Route the OSC1/OSC2 traces (pins 15 and 16) with short, matched lengths to the crystal or resonator, and keep them away from switching power or relay traces to avoid clock glitches. Place the analog AVss reference at a star-ground tied to a single VSS pin to avoid digital return-current coupling into ADC measurements. For noisy environments, add a ferrite bead between VDD and the MCU supply rail.
Thông tin tuân thủ
RoHS, REACH, lead-free, halogen-free, and conflict-mineral compliance were not stated in the verified web data; marked as 'unknown'. The PIC17LC756AT-08/L is not AEC-Q100 qualified and is not recommended for new automotive safety designs.
