PIC16C57CT-20I/SS - 8-Bit 20MHz 3KB OTP MCU 28-SSOP | Microchip
MPN： PIC16C57CT-20I/SS ✓ 啟用中PIC16C57CT-20I/SS 概覽
An OTP-based microcontroller is a flashless MCU whose program memory is written once at production via One-Time Programmable cells, then becomes permanently read-only. OTP MCUs sit inside the broader taxonomy of microcontroller -> embedded controller -> semiconductor, and they are commonly chosen for cost-optimized, high-volume applications where field firmware updates are not required. The PIC architecture pioneered by Microchip uses 12-bit-wide, highly orthogonal instructions to deliver roughly 2:1 code compression versus competing 8-bit cores, so 3 KB of OTP can address surprisingly complex control tasks.
Key features include a 33-instruction RISC set, only 2 special-function registers to configure interrupts and I/O direction, a watchdog timer with on-chip RC oscillator for fail-safe recovery, a power-on reset circuit, and an industrial-grade -40C to +85C operating range. The 20 MHz oscillator drives a four-clock-per-instruction pipeline that sustains 5 MIPS throughput, more than adequate for sensor conditioning, simple human-machine interfaces, and stepper or solenoid control loops.
Typical applications include automotive body modules, appliance controls, security keypads, low-end remote controls, and battery-powered instruments where unit cost and deterministic behavior outweigh the need for in-system reprogrammability. The 28-SSOP footprint makes the part drop-in compatible with several PIC16C5X and PIC16C55 family variants, simplifying multi-platform qualification.
When designing with this part, allocate the MCLR pin to a proper reset network and respect the OTP programming window because OTP parts cannot be reprogrammed. Use the watchdog timer for unattended operation and ensure the supply rail stays within 3.0 V to 5.5 V, including load-dump transients on 12 V automotive buses.
This page synthesizes verified distributor pricing, drop-in compatible variants, and practical design guidance drawn from Microchip PIC16C5X family documentation to help procurement and embedded engineers evaluate, source, and deploy this long-life classic MCU.
直接替換替代品，適用於 PIC16C57CT-20I/SS — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC16C57CT-20I/SS （相同外形與佔位） — 差異在於 Program Memory Size, Mounting Type, RAM Size, Maximum Clock Frequency, Core Architecture.
PIC16C57C-20I/SS
✅ 直接替換聯絡詢價
查看資料表 →PIC16C57CT-04I/SS
✅ 直接替換聯絡詢價
查看資料表 →PIC16C57CT-20I/SS 最大額定值與電氣特性
| Manufacturer | Microchip Technology |
| Series | PIC 16C |
| Core Processor | PIC |
| Core Size | 8-Bit |
| 最大時脈頻率 | 20 MHz |
| Program Memory Size | 3 KB (2K x 12) OTP |
| RAM Size | 72 x 8 bytes |
| Number of I/O Pins | 20 |
| Number of Instructions | 33 |
| Instruction Cycle Time | 200 ns (at 20 MHz) |
| Supply Voltage Range | 3.0 V to 5.5 V |
| 工作溫度範圍 | -40C to +85C (Industrial) |
| 封裝 / 外殼 | 28-SSOP (0.209", 5.30 mm Width) |
| 安裝類型 | Surface Mount (Gull Wing) |
| 記憶體類型 | OTP (One-Time Programmable) |
PIC16C57CT-20I/SS 腳位配置
| 腳位 1 | RA2 — Bidirectional I/O Port A bit 2 |
| 腳位 2 | RA3 — Bidirectional I/O Port A bit 3 |
| 腳位 3 | RA4/T0CKI — Bidirectional I/O Port A bit 4 / Timer0 clock input |
| 腳位 4 | MCLR — Master Clear (reset) input, active low |
| 腳位 5 | VSS — Ground reference |
| 腳位 6 | RB0/INT — Bidirectional I/O Port B bit 0 / External interrupt |
| 腳位 7 | RB1 — Bidirectional I/O Port B bit 1 |
| 腳位 8 | RB2 — Bidirectional I/O Port B bit 2 |
| 腳位 9 | RB3 — Bidirectional I/O Port B bit 3 |
| 腳位 10 | RB4 — Bidirectional I/O Port B bit 4 |
| 腳位 11 | RB5 — Bidirectional I/O Port B bit 5 |
| 腳位 12 | RB6 — Bidirectional I/O Port B bit 6 |
| 腳位 13 | RB7 — Bidirectional I/O Port B bit 7 |
| 腳位 14 | RC0 — Bidirectional I/O Port C bit 0 |
| 腳位 15 | RC1 — Bidirectional I/O Port C bit 1 |
| 腳位 16 | RC2 — Bidirectional I/O Port C bit 2 |
| 腳位 17 | RC3 — Bidirectional I/O Port C bit 3 |
| 腳位 18 | RC4 — Bidirectional I/O Port C bit 4 |
| 腳位 19 | RC5 — Bidirectional I/O Port C bit 5 |
| 腳位 20 | VDD — Positive supply (3.0 V to 5.5 V) |
| 腳位 21 | RC6 — Bidirectional I/O Port C bit 6 |
| 腳位 22 | RC7 — Bidirectional I/O Port C bit 7 |
| 腳位 23 | RA0 — Bidirectional I/O Port A bit 0 |
| 腳位 24 | RA1 — Bidirectional I/O Port A bit 1 |
| 腳位 25 | VSS — Ground reference (second ground pin) |
| 腳位 26 | OSC1/CLKIN — Oscillator input / external clock input |
| 腳位 27 | OSC2/CLKOUT — Oscillator output / clock output (crystal mode) |
| 腳位 28 | VSS — Ground reference (third ground pin) |
典型應用
PIC16C57CT-20I/SS 適用於 6 應用s: Appliance Control Board, Automotive Body Electronics, Security Keypad and Access Control, Industrial Sensor Interface, Remote Control and Consumer IR, Battery-Powered Instrumentation.
Appliance Control Board
The PIC16C57CT-20I/SS is well suited for low-cost appliance control boards such as microwave ovens, washing machines, and coffee makers, where 20 I/O pins can directly drive keypads, LED indicators, relay coils, and triac gates. Its 20 MHz core and 33-instruction RISC set provide enough headroom for PID-style temperature control loops running at 100 ms intervals, while the 3 KB OTP memory holds the full appliance state machine. Industrial-grade -40C to +85C operation tolerates the thermal stress of motor-driven cabinets, and the SSOP-28 footprint reflows cleanly on standard FR-4 lead-free profiles.
推薦
Automotive Body Electronics
Body-control micro-modules such as window lifters, mirror adjusters, and seat controllers benefit from the PIC16C57CT-20I/SS's industrial temperature rating, deterministic interrupt response, and small 28-SSOP footprint. The 20 MHz instruction cycle handles multiplexed switch scanning across 20 I/O without debounce software overhead, while the on-chip watchdog timer prevents lockup in noisy 12 V automotive environments. Designers pair this MCU with a 5 V LDO such as the LM2931 to ride through load-dump transients, and use the OTP memory to lock in calibration constants for end-of-line programming.
推薦
Security Keypad and Access Control
Security keypads, RFID reader front-ends, and simple access-control panels leverage the PIC16C57CT-20I/SS's 20 I/O to scan 4x4 matrices, drive piezo buzzers, and interface single-wire EEPROM for credential storage. The 33-instruction RISC set keeps firmware compact inside the 3 KB OTP budget, leaving headroom for rolling-code algorithms and tamper-detection logic. The OTP architecture also provides natural anti-tamper protection since the locked firmware cannot be read back. Industrial temperature tolerance suits outdoor enclosures, and the SSOP-28 footprint fits inside slim panel-mount designs.
推薦
Industrial Sensor Interface
The PIC16C57CT-20I/SS serves as a low-cost front-end for industrial sensor interfaces such as 4-20 mA loop transmitters, thermistor signal conditioners, and opto-isolated switch counters. Its 20 MHz instruction cycle executes linearization tables for NTC thermistors in under 50 us, and the 20 I/O can multiplex up to four analog channels through external sample-and-hold or MUX ICs. The industrial -40C to +85C range meets IEC 60068-2-1/2 environmental tests for factory floor deployment, while the 28-SSOP package reflows on standard HASL or ENIG finishes.
推薦
Remote Control and Consumer IR
Universal remote controls, toy controllers, and consumer IR transceivers benefit from the PIC16C57CT-20I/SS's low power consumption, deterministic interrupt response, and compact 28-SSOP form factor. The 20 MHz core generates precise 38 kHz carrier frequencies for IR transmission and samples demodulated signals from IR receivers such as the TSOP38238 with sub-microsecond jitter. OTP memory holds compressed protocol libraries (RC5, NEC, Sony SIRC) within the 3 KB code space, eliminating EEPROM lookups at runtime. Battery-powered designs run directly from two AA cells through a boost regulator.
推薦
Battery-Powered Instrumentation
Portable handheld instruments such as digital calipers, multimeters, and HVAC service tools use the PIC16C57CT-20I/SS to drive LCD segments, read rotary encoders, and manage sleep-mode power budgets. The PIC16C5X core supports multiple sleep modes that drop quiescent current to a few microamps, extending coin-cell or AAA battery life. The 20 I/O drive up to 80 LCD segments through external segment drivers like the CD4543, while 3 KB OTP holds calibration tables and units-conversion routines. Industrial temperature range supports outdoor field service across -40C to +85C.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16C57CT-20I/SS — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC16C57C-20I/SS | PIC16C57CT-04I/SS | PIC16C57CT-20I/SO |
|---|---|---|---|---|
| Package | 28-SSOP | 28-SSOP | 28-SSOP | 28-SOIC (different footprint) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 4 MHz | 20 MHz |
| Program Memory | 3 KB OTP | 3 KB OTP | 3 KB OTP | 3 KB OTP |
| RAM Size | 72 bytes | 72 bytes | 72 bytes | 72 bytes |
| Number of I/O | 20 | 20 | 20 | 20 |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| Packaging Form | Tape & Reel | Tube | Tape & Reel | Tape & Reel |
主要差異化特點
- Active production status with established long-life supply (對比PIC16C57-10I/P (PDIP-28))
- Industrial temperature grade with 20 MHz maximum clock (對比PIC16C57C-04I/SS)
- Compact 28-SSOP surface-mount footprint for SMT assembly (對比PIC16C57C-20I/P (PDIP-28))
設計說明
Estimated: at VDD=5.0 V, fOSC=20 MHz, all I/O switching, typical IDD is around 10 mA and peaks at 20 mA on worst-case instruction mix. Place a 0.1 uF X7R ceramic decoupling capacitor within 5 mm of the VDD pin and a bulk 10 uF tantalum or aluminum polymer capacitor on the same rail. For 12 V automotive supply rails, add a 5 V regulator (LM2931, TLE4275, or equivalent) to ride through load-dump transients up to 40 V. Industrial-grade parts tolerate -40C to +85C, so derate supply ripple above 60C ambient.
The PIC16C57CT-20I/SS supports four oscillator modes: LP (low-power 32 kHz crystal), XT (100 kHz to 4 MHz crystal), HS (4 MHz to 20 MHz crystal), and RC (resistor-capacitor). For 20 MHz operation, choose the HS mode with a fundamental-mode crystal and two 15-33 pF load capacitors sized per the crystal datasheet. Keep the OSC1/OSC2 traces short and guarded by a ground ring to avoid EMI pickup that can shift the clock duty cycle. If using an external CMOS clock, drive OSC1 only and leave OSC2 floating per Microchip PIC16C5X datasheet DS30453F.
Three recurring mistakes with PIC16C5X OTP designs: (1) leaving MCLR floating - always tie it to VDD through a 10 kohm pull-up and a 0.1 uF cap for a proper power-on reset; (2) exceeding the absolute-maximum VDD of 6.5 V which instantly destroys the OTP cells; (3) attempting to reprogram the device in-circuit - OTP memory cannot be erased and any high-voltage programming pulse will only partially damage the silicon. For prototyping, use the flash-based PIC16F57-I/SS in the same SSOP-28 footprint, then migrate to the OTP PIC16C57C for production.
Route the MCLR trace away from switching nodes such as relay coils or triac gates; even 50 mV of capacitive coupling can trigger false resets on the Schmidt-trigger input. Place the ICSP/ICD programming header footprints even on production boards to allow factory programming without rework - the PIC16C5X family uses a 5-pin ICSP interface (VDD, VSS, MCLR, RB6, RB7) that fits within the 28-SSOP outline. Keep the SSOP-28 solder lands at 0.65 mm pitch with NSMD pads for best lead-free reflow yield per IPC-7351.
合規資訊
RoHS, REACH, halogen-free, and conflict-mineral declarations were not present in the Verified Web Data and are marked unknown. AEC-Q100 is not applicable because the PIC16C57C family is qualified to industrial (-40C to +85C) rather than automotive (-40C to +125C with AEC-Q100) standards.
