PIC16C57T-XT/SO - 8-Bit 4MHz OTP MCU, 3KB | Microchip
MPN: PIC16C57T-XT/SO ✗ Cuối đờiPIC16C57T-XT/SO Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data memory, and programmable I/O peripherals. The PIC16C5X family uses a 12-bit wide instruction word with Harvard architecture (separate program and data buses), achieving roughly 2:1 code compression over typical 8-bit microcontrollers in its class. Within the broader taxonomy, the PIC16C57 belongs to the OTP-microcontroller segment of the 8-bit MCU category, sitting between mask-ROM and Flash-based parts on the cost/flexibility curve.
Key differentiating features include the 4 MHz top operating frequency from an XT (crystal/ceramic resonator) oscillator, 20 I/O pins with individual direction control, a watchdog timer, a power-on reset circuit, and a programmable code-protection mechanism. The OTP program memory allows prototype-to-production migration without tooling charges that mask ROM parts require, while the 28-pin SOIC footprint is compatible with standard SMT assembly lines.
The PIC16C57T-XT/SO uses a RISC-like instruction set of 33 single-word/cycle instructions, an 8-bit ALU with internal accumulator, and a 2-level hardware stack. Peripherals include Timer0 (8-bit with prescaler), real-time clock/counter mode, and direct/indirect addressing modes for accessing the 72-byte data RAM.
Typical applications include appliance control, HVAC thermostat logic, simple sensor interfaces, automotive body controllers (non-safety), and legacy industrial automation. Designers choose this part when low unit cost, deterministic instruction timing, and a small footprint outweigh the need for in-system reprogrammability.
When designing with this device, ensure the XT-mode crystal or resonator value falls within the 4 MHz maximum and verify timing budget margins across the full -40 °C to +70 °C commercial operating range. OTP parts cannot be reprogrammed after encapsulation, so use a windowed/EPROM variant for prototyping.
This page synthesizes distributor pricing, drop-in same-package alternatives (including PIC16C57T family members from Microchip), and practical design considerations not consolidated in a single manufacturer datasheet view.
Bộ thay thế dễ dàng lắp đặt cho PIC16C57T-XT/SO — 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 PIC16C57T-XT/SO (cùng hình factor và footprint) — khác nhau ở Package, Timers, Maximum Clock Frequency, Instruction Set, Oscillator Type.
PIC16C57T-10I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C57T-RCI/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C57T-RCE/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C57-RCI/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F57-I/SO
✅ Drop-In✗ Hết hàng
$1.21 / Đơn vị
Xem tài liệu →PIC16C57T-XT/SO Tỷ lệ tối đa & tính chất điện
| Core | 8-bit PIC |
| Series | PIC® 16C |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 3 KB (2K x 12) |
| RAM | 72 bytes |
| Data EEPROM | None |
| Tần số xung maksimum | 4 MHz |
| Oscillator Type | XT (external crystal/resonator) |
| Điện áp cung cấp | 5 V nominal |
| I/O Pins | 20 |
| Timers | 1 x 8-bit (Timer0 with prescaler) |
| Instruction Set | 33 single-word/cycle instructions (12-bit wide) |
| Stack | 2-level hardware |
| Hộp | 28-SOIC (7.50 mm body width) |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân PIC16C57T-XT/SO
| Chân 1 | RA2 — PORTA bit 2 (bidirectional I/O) |
| Chân 2 | RA3 — PORTA bit 3 (bidirectional I/O) |
| Chân 3 | RA0 — PORTA bit 0 (bidirectional I/O) |
| Chân 4 | RA1 — PORTA bit 1 (bidirectional I/O) |
| Chân 5 | OSC1/CLKIN — Oscillator input / external clock input |
| Chân 6 | OSC2/CLKOUT — Oscillator output / clock output |
| Chân 7 | VSS — Ground reference |
| Chân 8 | RC0 — PORTC bit 0 (bidirectional I/O) |
| Chân 9 | RC1 — PORTC bit 1 (bidirectional I/O) |
| Chân 10 | RC2 — PORTC bit 2 (bidirectional I/O) |
| Chân 11 | RC3 — PORTC bit 3 (bidirectional I/O) |
| Chân 12 | RC4 — PORTC bit 4 (bidirectional I/O) |
| Chân 13 | RC5 — PORTC bit 5 (bidirectional I/O) |
| Chân 14 | RC6 — PORTC bit 6 (bidirectional I/O) |
| Chân 15 | RC7 — PORTC bit 7 (bidirectional I/O) |
| Chân 16 | VSS — Ground reference |
| Chân 17 | VDD — Positive supply (5 V nominal) |
| Chân 18 | RB0 — PORTB bit 0 (bidirectional I/O) |
| Chân 19 | RB1 — PORTB bit 1 (bidirectional I/O) |
| Chân 20 | RB2 — PORTB bit 2 (bidirectional I/O) |
| Chân 21 | RB3 — PORTB bit 3 (bidirectional I/O) |
| Chân 22 | RB4 — PORTB bit 4 (bidirectional I/O) |
| Chân 23 | RB5 — PORTB bit 5 (bidirectional I/O) |
| Chân 24 | RB6 — PORTB bit 6 (bidirectional I/O) |
| Chân 25 | RB7 — PORTB bit 7 (bidirectional I/O) |
| Chân 26 | T0CKI — Timer0 external clock input |
| Chân 27 | VDD — Positive supply (5 V nominal) |
| Chân 28 | MCLR/Vpp — Master clear reset / programming voltage input |
Ứng dụng tiêu biểu
PIC16C57T-XT/SO phù hợp cho 6 Áp dụngs: Appliance Control (Washing Machine / Dishwasher), HVAC Thermostat Logic Controller, Automotive Body Controller (Non-Safety), Simple Sensor Interface Module, Vending Machine Coin Mechanism Controller, Industrial Timer / Counter Module.
Appliance Control (Washing Machine / Dishwasher)
The PIC16C57T-XT/SO fits appliance control boards thanks to its 20 I/O pins (enough to drive relays, status LEDs, push-buttons, and a 7-segment display), 4 MHz XT oscillator (sufficient for relay debouncing and timing sequences), and 3 KB OTP (enough for state-machine firmware). Its Harvard 12-bit core executes 1 µs per instruction at 4 MHz, giving deterministic timing for safety interlocks. The 28-SOIC package is compatible with high-volume SMT lines used in white goods. Compared to a Flash MCU, OTP prevents accidental firmware tampering after production.
Được đề xuất
HVAC Thermostat Logic Controller
The PIC16C57T-XT/SO serves as a thermostat logic MCU thanks to its low unit cost, deterministic 4 MHz instruction timing for temperature sampling loops, and 20 I/O pins for keypad/display multiplexing. The 72-byte RAM supports a small setpoint buffer and hysteresis state, while the 8-bit Timer0 with prescaler generates the ADC-free temperature-to-time conversion (via thermistor RC charge timing). The 28-SOIC package tolerates the -10 °C to +60 °C range typical of indoor thermostats. Pairing with a 24LC02 serial EEPROM stores user schedules without expanding part count.
Được đề xuất
Automotive Body Controller (Non-Safety)
The PIC16C57T-XT/SO is used in non-safety automotive body modules (window lifters, mirror adjusters, seat controllers) where its 5 V supply, 28-SOIC surface-mount footprint, and OTP memory protect against post-production firmware tampering. The 20 I/O pins drive H-bridge enable signals and read limit-switch inputs; the 4 MHz clock gives 250 ns per instruction cycle for fast PWM-free control loops. The automotive-grade variant PIC16C57T-10I/SO extends temperature to -40 °C to +85 °C for under-dash mounting. Cost per node is the primary selection driver versus Flash MCUs.
Được đề xuất
Simple Sensor Interface Module
The PIC16C57T-XT/SO acts as a low-cost sensor hub (4-20 mA loop read, thermistor linearization, pulse counting) thanks to its 8-bit ALU, 20 I/O pins (configurable digital or analog comparator), and 4 MHz throughput for 100 Hz update rates. The 72-byte RAM buffers a few sensor readings before UART transmission. The 28-SOIC footprint fits standard 1-inch square sensor PCBAs. Engineers choose OTP over Flash to lock the calibration coefficients at production, preventing field-recalibration.
Được đề xuất
Vending Machine Coin Mechanism Controller
The PIC16C57T-XT/SO controls coin acceptors and bill validators in vending machines, leveraging 3 KB OTP for the coin-discrimination state machine, 20 I/O for sensor inputs and dispenser relay control, and 4 MHz deterministic timing to debounce coin-pulse trains at 100 Hz. The 28-SOIC package survives the +5 °C to +50 °C indoor vending environment. OTP memory prevents field piracy of the coin-acceptance algorithm. The 2-level hardware stack is sufficient because the firmware is structured as a flat state machine.
Được đề xuất
Industrial Timer / Counter Module
The PIC16C57T-XT/SO is well suited for DIN-rail-mountable industrial timers (cycle counters, delay-on-make relays, totalizers) due to its low cost, OTP code protection for OEM timing algorithms, and 8-bit Timer0 hardware counter that can be cascaded with external pulse sources. The 20 I/O pins handle start/stop inputs, mode selection switches, and relay coil drivers. The 4 MHz XT oscillator provides 1 µs resolution for sub-millisecond timing via prescaler. The 28-SOIC surface-mount package supports conformal-coated PCBAs for harsh industrial environments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C57T-XT/SO — 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 | PIC16C57T-10I/SO | PIC16C57T-RCI/SS | PIC16C57T-RCE/SS | PIC16C57-RCI/SS | PIC16F57-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC | 28-SSOP | 28-SSOP | 28-SSOP | 28-SOIC |
| Program Memory | 3 KB OTP | 3 KB OTP | 3 KB OTP | 3 KB OTP | 3 KB OTP | 2 KB Flash |
| Max Clock Frequency | 4 MHz | 10 MHz | 4 MHz (RC) | 4 MHz (RC) | 4 MHz (RC) | 20 MHz |
| Oscillator Type | XT (crystal) | XT (crystal) | RC | RC | RC | XT (crystal) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active |
| Pin Count | 28 | 28 | 28 | 28 | 28 | 28 |
Bảo phân biệt quan trọng
- Same 28-SOIC footprint with higher 10 MHz grade for faster timing budgets (vsPIC16C57T-10I/SO)
- Flash memory for in-system reprogrammability vs OTP (vsPIC16F57-I/SO)
- Lower-cost RC oscillator option vs XT crystal requirement (vsPIC16C57T-RCI/SS)
Ghi chú thiết kế
The PIC16C57T-XT/SO requires a stable 5 V ±10 % supply (4.5 V to 5.5 V) on VDD pins 17 and 27, with decoupling 100 nF ceramic placed within 5 mm of each VDD pin. The MCLR/Vpp pin (pin 28) must be pulled to VDD through a 10 kΩ resistor for normal operation; during programming, Vpp rises to 13 V. Power-on reset (POR) is internal, so no external POR circuit is required, but ensure VDD rise time is under 50 ms per datasheet section on POR timing.
Use a 4 MHz fundamental-mode AT-cut crystal across OSC1 (pin 5) and OSC2 (pin 6), with two 22 pF load capacitors to ground. For higher-noise environments, add a 1 MΩ parallel resistor to bias the oscillator. Estimated: for a 4 MHz XT crystal at 20 pF load, total load capacitance is (C1 × C2)/(C1+C2) + Cstray ≈ 12 pF with 22 pF parts, which sits inside the 10-32 pF window the Microchip datasheet specifies for XT mode. Keep oscillator traces short and surrounded by ground pour.
Do not attempt to reprogram the OTP program memory after encapsulation: the PIC16C57T-XT/SO is one-time programmable and cannot be erased. Use a windowed UV-erasable PIC16C57 (e.g., PIC16C57-10/P with ceramic window) for prototyping, then move to OTP for production. Another common pitfall is overlooking the 2-level hardware stack: nested subroutine calls deeper than two will overwrite the return address and cause erratic resets; restructure as a flat state machine or inline the calls.
PORTB pins RB0-RB7 (pins 18-25) have internal weak pull-ups enabled by clearing the RBPU bit in the OPTION register; this simplifies switch input wiring but the pull-ups are ~50-100 kΩ nominal. For noisy environments, add 1 kΩ external pull-downs or debounce via 10 ms software delays rather than relying on the weak pull-ups alone. PORTA (pins 1-4) and PORTC (pins 8-15) have Schmitt trigger inputs and TTL-compatible outputs.
Thông tin tuân thủ
Compliance status was not present in the verified web data. PIC16C5X OTP family predates widespread RoHS adoption; many -XT/SO variants are non-RoHS. Verify with the manufacturer's product compliance certificate before placing in RoHS-restricted designs. PIC16F57-I/SO is the active-lifecycle alternative with full RoHS compliance.
