PIC18C252/JW - 8-Bit 40MHz 32KB EPROM 28-CerDip MCU | Microchip
MPN: PIC18C252/JW ✗ סוף ייצורPIC18C252/JW סקירה
An 8-bit microcontroller (MCU) is a single-chip computer built around a CPU core, program memory, data RAM, and integrated peripherals such as timers, ADC, communication ports, and I/O. PIC18-family MCUs belong to Microchip's enhanced mid-range 8-bit RISC architecture, which sits hierarchically between the legacy PIC16 mid-range and the PIC17 high-end series, and forms the foundation of Microchip's PIC architecture (micros, microcontrollers, semiconductors, integrated circuits). The /JW suffix denotes a windowed ceramic package that allows UV erasure of the EPROM array for repeated development cycles - a hallmark of legacy OTP-based PIC18C devices.
Key features include a C-compiler-optimized RISC architecture with only 77 single-word instructions, source-code compatibility with PIC16CXX devices, a hardware single-cycle 8x8 multiplier, eight-level priority interrupt controller, and dual 16-bit Capture/Compare/PWM modules. The 28-pin windowed CerDIP is rated for the commercial 0C to +70C range and supports 23 digital I/O lines for user application interfaces.
Typical applications include embedded control prototypes, industrial automation controllers, instrumentation front-ends, motor control loops, and educational development platforms where UV-erasable program memory accelerates firmware iteration. The windowed package is also preferred for low-volume production runs and field firmware updates via UV erasure.
When designing with this part, verify that in-circuit socketing accommodates the 0.600-inch wide CerDIP body and the quartz window. Migration to the pin-compatible flash-based PIC18F252 is recommended for new designs because OTP/EPROM devices are NRND - the silicon is mature and Microchip explicitly recommends PIC18F252 as the modern replacement.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
חלופות תחליף ישיר עבור PIC18C252/JW — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם PIC18C252/JW (אותו גורם צורה וטביעת רגל) — שונים ב Mounting Type, ADC, Core Architecture, Operating Temperature, Package.
PIC18F252-I/SP
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC18F252-I/JW
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC18C252-I/SP
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18C252-E/SP
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F252-I/SO
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18C252/JW דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | PIC18 (8-bit) |
| Program Memory Type | EPROM (UV-erasable, windowed) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 1.5 KB (1536 bytes) |
| Maximum CPU Frequency | 40 MHz |
| Instruction Throughput | 10 MIPS |
| Instruction Cycle Time | 100 ns |
| Number of I/O Pins | 23 |
| Package Type | 28-pin Windowed Ceramic DIP (CerDIP), 0.300 inch / 7.62 mm row spacing |
| סוג הרכבה | Through-Hole |
| Operating Voltage | 4.2 V to 5.5 V (5 V nominal) |
| טווח טמפרטורת פעולה | 0C to +70C (commercial) |
| Number of Instructions | 77 single-word |
| Multiplier | Single-cycle 8x8 hardware |
| Interrupt Priority Levels | 8 |
| On-chip Peripherals | Brown-out Reset, LVD, POR, PWM, WDT, Capture/Compare |
| רמת MSL | N/A (through-hole, not moisture-sensitive) |
תצורת פינים של PIC18C252/JW
| פין 1 | MCLR/VPP — Master Clear (reset) input / Programming voltage input |
| פין 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| פין 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| פין 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| פין 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / Voltage reference |
| פין 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| פין 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| פין 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| פין 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| פין 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| פין 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| פין 12 | RC2/CCP1 — PORTC bit 2 / Capture Compare PWM 1 |
| פין 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| פין 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| פין 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| פין 16 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| פין 17 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| פין 18 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| פין 19 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| פין 20 | VSS — Ground reference |
| פין 21 | VDD — Positive supply voltage (+5V) |
| פין 22 | RB2 — PORTB bit 2 |
| פין 23 | RB3 — PORTB bit 3 |
| פין 24 | RB4 — PORTB bit 4 |
| פין 25 | RB5 — PORTB bit 5 |
| פין 26 | RB6/PGC — PORTB bit 6 / In-circuit debugger clock |
| פין 27 | RB7/PGD — PORTB bit 7 / In-circuit debugger data |
| פין 28 | VSS — Ground reference (secondary) |
יישומים טיפוסיים
PIC18C252/JW מתאים עבור 6 יישוםs: Embedded Control Prototyping, Industrial Automation Controllers, Instrumentation Front-Ends, Motor Control Loops, Educational Development Platforms, Low-Volume Production Controllers.
Embedded Control Prototyping
The PIC18C252/JW's 32 KB UV-erasable EPROM and 40 MHz / 10 MIPS throughput make it ideal for embedded control prototyping where firmware must be revised repeatedly during development. Per the Microchip datasheet DS39526, the windowed /JW ceramic package permits dozens of UV erase cycles, accelerating the bring-up loop for closed-loop controllers. The 1.5 KB RAM comfortably holds stack plus buffers for UART, ADC, and PWM control variables. Engineers typically pair this MCU with an external EPROM eraser socket and use the 23 I/O pins to drive sensors, H-bridges, and indicator LEDs.
מומלץ
Industrial Automation Controllers
The PIC18C252/JW fits industrial automation controllers because its integrated peripherals - PWM, Capture/Compare, WDT, BOR, LVD - handle motor drive signaling and sensor feedback without external driver ICs. According to the Microchip datasheet, the 8-level priority interrupt controller supports deterministic response times for safety-critical interlocks. The 40 MHz CPU cycle (100 ns instruction) enables real-time PID loops at typical 1 kHz control rates. The 0C to +70C commercial temperature rating suits cabinet-mounted equipment, while the -I/SP variants extend coverage for harsher factory environments.
מומלץ
Instrumentation Front-Ends
The PIC18C252/JW is well-suited for instrumentation front-ends where 10 MIPS throughput drives ADC sampling, FFT preprocessing, and LCD update tasks. Per Microchip datasheet DS39526, the 16-bit instruction bus and 8x8 hardware multiplier accelerate numerical conditioning of sensor signals. The 23 I/O pins can simultaneously drive a character LCD, keypad matrix, UART telemetry, and SPI peripherals such as external ADCs or DACs. The windowed EPROM allows iterative tuning of calibration coefficients stored in firmware during prototype characterization.
מומלץ
Motor Control Loops
The PIC18C252/JW's dual 16-bit Capture/Compare/PWM modules and 40 MHz instruction rate make it capable of running brushed DC and stepper motor control loops at typical 20 kHz PWM frequencies. According to the Microchip datasheet, the 8-level interrupt priority allows deterministic current-sense sampling and commutation timing. The 32 KB program memory accommodates state-machine commutation tables plus velocity-profile lookup tables. Windowed EPROM is particularly valuable during development when motor tuning parameters are iterated frequently.
מומלץ
Educational Development Platforms
The PIC18C252/JW is widely used in university embedded systems courses because the windowed ceramic package allows students to erase and reprogram their own firmware using a low-cost UV eraser, reinforcing memory technology concepts. Per Microchip datasheet DS39526, the 77-instruction PIC18 RISC set provides a manageable learning curve while supporting real C-compiler development via MPLAB XC8. The 28-pin DIP footprint fits standard breadboards and ZIF sockets used in academic labs. Pin-compatible migration to PIC18F252 lets instructors teach both legacy EPROM and modern flash paradigms.
מומלץ
Low-Volume Production Controllers
The PIC18C252/JW suits low-volume production controllers and field-firmware-updatable systems because the windowed EPROM allows field re-programming without a dedicated programmer - field engineers can update firmware using a portable UV eraser and standard device programmer. According to Microchip datasheet DS39526, the 28-pin CerDIP package has a documented long-term reliability track record in industrial and military applications. The 5V supply tolerance simplifies integration with legacy analog signal conditioning circuits. For larger volumes, Microchip recommends transitioning to PIC18F252 in-circuit flash variants.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC18C252/JW — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC18F252-I/SP | PIC18F252-I/JW | PIC18C252-I/SP | PIC18C252-E/SP | PIC18F252-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-pin Windowed CerDIP | 28-pin SPDIP - same footprint | 28-pin Windowed CerDIP - same | 28-pin SPDIP - same footprint | 28-pin SPDIP - same footprint | 28-pin SOIC - PCB redesign required |
| Program Memory Type | 32 KB UV-EPROM | 32 KB flash | 32 KB flash | 32 KB OTP EPROM | 32 KB OTP EPROM | 32 KB flash |
| Maximum Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| RAM Size | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB | 1.5 KB |
| Operating Temperature | 0C to +70C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +85C |
| Lifecycle Status | NRND | Active | Active | NRND | NRND | Active |
| Reprogrammability | UV erasure via window | In-circuit flash, 100k cycles | In-circuit flash, 100k cycles | OTP, not erasable | OTP, not erasable | In-circuit flash, 100k cycles |
| I/O Pins | 23 | 23 | 23 | 23 | 23 | 23 |
מבדילים עיקריים
- UV-erasable windowed ceramic package for prototype development cycles (לעומתPIC18F252-I/SP)
- Legacy Microchip PIC18C architecture with proven long-term reliability (לעומתPIC18F252-I/JW)
- Single 5V supply operation matches legacy industrial designs (לעומתPIC18F252-I/SO)
הערות תכנון
The PIC18C252/JW operates from a single 5V supply at 4.2V to 5.5V per the Microchip datasheet DS39526. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the VDD pin and a bulk 10 uF tantalum or aluminum polymer capacitor at the PCB power entry. Add a ferrite bead or small inductor (10 uH) on the VDD trace if the board shares a noisy switching regulator. Brown-out Reset (BOR) is enabled by configuration fuse and will hold the MCU in reset until VDD rises above the BOR threshold (~4.0V typical), preventing code execution at marginal voltages.
Estimated: At maximum 40 MHz operation from a 5V supply with all peripherals active, the PIC18C252/JW draws approximately 25-35 mA, dissipating 125-175 mW. The 28-pin CerDIP has a theta_JA of approximately 60 C/W, yielding a junction temperature rise of 7.5-10.5 C above ambient - well within the 0C to +70C commercial range. No heatsink is required. For long-term reliability in enclosed housings, ensure ambient temperature stays below 60 C and provide minimum 1 oz copper pour on VDD/GND planes for heat spreading.
The 28-pin CerDIP body is 0.600 inch wide (larger than 0.300 inch for SOIC). PCB sockets must accept this wider footprint - use machined-pin DIP sockets (e.g., 3M 28-pin socket) for production, or zero-insertion-force (ZIF) sockets for development with UV erasure cycles. Place the quartz erase window unobstructed (no heat sinks or components above it) to allow UV eraser access. Route OSC1/OSC2 traces short and symmetric to minimize parasitic capacitance; ground guard the oscillator traces to reduce EMI coupling.
Do not confuse the /JW windowed CerDIP with the -I/SP plastic SPDIP - they are electrically identical but only the /JW allows UV erasure. When migrating to PIC18F252, verify configuration bits: PIC18F252 flash erase/write cycles (1,000 minimum, 100,000 typical) and BOR/POR thresholds differ slightly from PIC18C252 EPROM part. The PIC18C252 has no in-circuit serial programming (ICSP) capability; programming must use a high-voltage parallel programmer that drives VPP (pin 1) to 13V. For new designs, switch to PIC18F252 for ICSP support.
The PIC18C252/JW operates at 40 MHz internal clock with 100 ns instruction cycle; signal integrity for I/O switching should account for 10 ns rise/fall times. Place 33 ohm series resistors on PORTB and PORTC outputs driving long PCB traces (>50 mm) to dampen ringing. The CCP1/CCP2 PWM outputs (RC2/RC1) can switch up to 20 mA - if driving external MOSFET gates directly, add 100 ohm gate resistors to limit peak current. The MCLR pin (pin 1) requires a 10 kohm pull-up to VDD and a 100 nF decoupling cap to ground for noise immunity.
מידע על תאימות
RoHS and REACH compliance status not explicitly stated in verified web data for PIC18C252/JW; the windowed CerDIP package was originally designed before RoHS directives. AEC-Q100 is not applicable - this is a commercial-grade MCU without automotive qualification. Engineers should verify compliance with Microchip directly for new product designs.
