PIC18C452/JW - 8-Bit 40MHz 32KB EPROM MCU | Microchip
N.º de pieza: PIC18C452/JW ✗ Fin de vidaPIC18C452/JW Descripción general
A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory, working RAM, and peripheral interfaces into one device. PIC microcontrollers (Peripheral Interface Controllers) use a Harvard RISC architecture with separate program and data buses, enabling single-cycle instruction execution. The PIC18 family extends PIC16 compatibility with a 16-bit instruction word, hardware multiply, and 16-bit data paths, positioning PIC18C parts as the high-performance tier before the PIC18F flash-based successors superseded them.
The PIC18C452/JW key features include 32KB program, 1.5KB RAM, 256 bytes of EEPROM data, 34 I/O, 10-bit 8-channel ADC, USART/SPI/I²C, dual analog comparators, two PWM channels, programmable brown-out reset, and a wide 2.0V–5.5V operating range with four oscillator modes (LP, XT, HS, RC). Compared with PIC16 8-bit predecessors it offers a 16-bit instruction word, hardware multiplier (single-cycle 8×8), larger linear code space, and a richer interrupt structure.
The architecture uses 77 single-word instructions and a 16-level deep hardware stack, with vectored interrupts and an enhanced peripheral set. The C-compiler friendly instruction set and 16-bit-wide program bus deliver deterministic performance, making the PIC18C452/JW suited to real-time control.
Typical applications include industrial control prototyping, motor control, instrumentation with ADC front-ends, embedded serial comms bridges, and educational development kits where the UV window enables rapid code iteration. The device is also used as a reference design platform for migrating legacy PIC18C code to modern flash PIC18F devices.
When designing with this device, evaluate whether a flash-based PIC18F452 is preferable for production: PIC18F parts are reprogrammable in-circuit, removing the UV-erasure workflow required by the PIC18C452/JW CERDIP.
This page synthesizes distributor pricing, parametric comparison, and practical substitution guidance not found in the manufacturer datasheet, including same-package and cross-package drop-in guidance for both legacy and modern Microchip alternatives.
Alternativas directas para PIC18C452/JW — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
No hay alternativas directas disponibles para este producto.
Solicitar alternativasPIC18C452/JW Valores máximos y características eléctricas
| Family | PIC® 18C |
| Core Size | 8-bit |
| Core Processor | PIC |
| Program Memory Type | EPROM (UV-erasable) |
| Program Memory Size | 32KB (16K x 16) |
| RAM | 1.5KB (1536 x 8) |
| EEPROM | 256 x 8 |
| Frecuencia de reloj máxima | 40 MHz |
| Instruction Execution | 10 MIPS (100 ns per instruction) |
| Number of I/O Pins | 34 |
| ADC | 10-bit, 8 channels |
| Connectivity | I²C, SPI, UART/USART |
| Timer/Counters | 2 x 8-bit, 3 x 16-bit |
| PWM Channels | 2 (CCP module) |
| Analog Comparators | 2 |
| Operating Voltage | 2.0 V to 5.5 V |
| Temperatura de funcionamiento | -40°C to +85°C |
| Encapsulado / Carcasa | 40-CERDIP (windowed), 600 mil |
| Tipo de montaje | Through Hole |
| Oscillator Modes | LP, XT, HS, RC |
| Instruction Set | 77 single-word instructions |
| Programming Method | UV erase + parallel programming via quartz window |
Configuración de pines de PIC18C452/JW
| Pin 1 | MCLR/VPP — Master Clear reset input / programming voltage |
| Pin 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| Pin 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI Slave Select |
| Pin 8 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 9 | OSC1/CLKIN — Oscillator input / external clock in |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 PWM output |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I²C clock |
| Pin 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I²C data |
| Pin 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Pin 18 | GND — Ground reference |
| Pin 19 | VDD — Positive supply voltage |
| Pin 20 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| Pin 21 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| Pin 22 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| Pin 23 | RB3/CCP2 — PORTB bit 3 / CCP2 alternate |
| Pin 24 | RB4 — PORTB bit 4 |
| Pin 25 | RB5 — PORTB bit 5 |
| Pin 26 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 27 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 28 | VDD — Positive supply voltage |
| Pin 29 | GND — Ground reference |
| Pin 30 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 31 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 32 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 33 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 34 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 35 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 36 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 37 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 38 | RE0/RD/AN5 — PORTE bit 0 / read strobe / analog input 5 |
| Pin 39 | RE1/WR/AN6 — PORTE bit 1 / write strobe / analog input 6 |
| Pin 40 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
Aplicaciones típicas
PIC18C452/JW es adecuado para 6 aplicacións: Industrial Control Prototyping, Embedded Motor Control, Educational Development Kit, ADC-Based Instrumentation, Serial Communication Bridge, Legacy Code Maintenance Platform.
Industrial Control Prototyping
The PIC18C452/JW's UV-erasable windowed CERDIP package makes it ideal for industrial control prototyping where firmware is frequently iterated. With 32KB EPROM program memory and 1.5KB RAM, the device can run complex state machines and PID controllers. Its 40MHz clock delivers 10 MIPS throughput, sufficient for real-time control loops sampling at kHz rates. The 34 I/O pins connect to sensors, motor drivers, and discrete actuators. Compared with OTP plastic parts, the /JW window lets engineers erase and reprogram code in minutes via UV light exposure, accelerating prototype cycles. Choose this part only for development; migrate to PIC18F452-I/P for production.
Recomendado
Embedded Motor Control
The PIC18C452/JW fits embedded motor control applications through its CCP (Capture/Compare/PWM) module providing two PWM channels for H-bridge or three-phase drive signals, plus dual analog comparators for current sensing and feedback. The 10-bit 8-channel ADC samples motor position, current, and back-EMF at up to 40MHz clock rate. Three 16-bit timers enable precise commutation timing for brushless DC or stepper motors. Engineers building DC servo or BLDC prototypes benefit from the /JW window for rapid tuning of PWM duty cycles and acceleration profiles before porting to a flash-based production MCU.
Recomendado
Educational Development Kit
The PIC18C452/JW is widely used in educational environments to teach embedded programming, because its UV window allows students to erase and reprogram a single device through dozens of code iterations without needing flash memory. The 77-instruction RISC architecture provides an accessible learning curve from PIC16, while introducing 16-bit instruction words, hardware multiply, and vectored interrupts. Universities and training labs benefit from cost amortization across a long curriculum. The CERDIP through-hole package also suits solderless breadboards and educational prototyping boards. Recommend pairing with PIC18F452-I/P or PIC16F877A for in-circuit-debug teaching.
Recomendado
ADC-Based Instrumentation
The PIC18C452/JW's integrated 10-bit 8-channel ADC enables multi-sensor data acquisition for instrumentation prototypes including temperature, pressure, and strain gauge signal conditioning. With 1.5KB RAM and 256 bytes of EEPROM, the device can buffer acquisition frames and store calibration constants in non-volatile memory. The 40MHz clock provides adequate conversion timing for moderate sample rates. Engineers building laboratory data loggers, weighing scales, or analog front-end prototypes use the /JW window to fine-tune sample timing. For production designs, PIC18F452-I/P delivers the same ADC performance with in-circuit firmware updates.
Recomendado
Serial Communication Bridge
The PIC18C452/JW supports serial protocol bridging through its integrated USART, SPI, and I²C (Master/Slave) interfaces, enabling gateway designs between heterogeneous industrial buses. The 32KB program memory accommodates multi-protocol stacks such as MODBUS RTU to SPI sensor translation or UART-to-I²C sensor aggregation. The 1.5KB RAM buffers incoming packets before protocol translation. Engineers prototyping industrial IoT gateways or sensor hubs use the /JW window for quick protocol tuning. For production migration, PIC18F452-I/P retains the same peripheral mix with flash reprogrammability.
Recomendado
Legacy Code Maintenance Platform
Engineers maintaining legacy PIC18C452/JW code bases use this part as a reference platform for firmware regression testing before migrating to PIC18F452 flash equivalents. The identical PIC18 core ensures binary-instruction compatibility for code that does not depend on EPROM-specific timing. With 34 I/O and 40-pin CERDIP windowed package, the /JW part lets developers reproduce exact hardware behavior on legacy boards while revalidating timing-critical code. For hardware-in-the-loop test stands, the /JW window enables rapid re-flash between test cases. This use case is justified by code-compat; new designs should use flash PIC18F452.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC18C452/JW — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC18F452-I/P | PIC18C452-I/P | PIC18C452-E/P | PIC18C452-I/L |
|---|---|---|---|---|---|
| Package | 40-CERDIP (windowed) | DIP-40 (plastic, no window) | DIP-40 (plastic, OTP) | DIP-40 (plastic, OTP) | LDCC-44 (surface mount, OTP) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit | PIC18 8-bit |
| Program Memory | 32KB EPROM (UV) | 32KB Flash | 32KB EPROM (OTP) | 32KB EPROM (OTP) | 32KB EPROM (OTP) |
| RAM | 1.5KB | 1.5KB | 1.5KB | 1.5KB | 1.5KB |
| Max Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| I/O Pins | 34 | 34 | 34 | 34 | 34 |
| ADC | 10-bit 8-ch | 10-bit 8-ch | 10-bit 8-ch | 10-bit 8-ch | 10-bit 8-ch |
| Windowed (UV erase) | Yes (CERDIP /JW) | No (Flash, ICSP) | No (OTP) | No (OTP) | No (OTP) |
| Lifecycle | Obsolete | Active | Obsolete | Obsolete | Obsolete |
Diferenciadores clave
- UV-erasable windowed package (frente a PIC18F452-I/P)
- Through-hole CERDIP mechanical robustness (frente a PIC18F452-I/P (plastic DIP))
- Active replacement path with flash (frente a PIC18C452-I/P (OTP plastic))
Notas de diseño
PIC18C452/JW is UV-erasable EPROM, not flash. Erasure requires 20-30 minutes of exposure to UV light at 254nm wavelength (e.g. UV eraser rated 12,000 µW·s/cm²). The /JW ceramic window must remain clean and scratch-free for reliable erasure. Storing the part in opaque foam when not in use prevents accidental erasure from ambient UV light. Attempting to reprogram via standard flash ICSP will not work on EPROM-based PIC18C452 parts; use parallel programming mode instead.
Brown-out reset (BOR) should be enabled below 4V VDD to prevent code runaway during voltage dips, particularly in industrial environments with inductive loads. The PIC18C452 supports four oscillator modes: LP (low-power crystal, ≤200kHz), XT (standard crystal, ≤4MHz), HS (high-speed crystal, up to 40MHz at 5V), and RC (resistor-capacitor). At 2V VDD, maximum clock frequency drops to ~4MHz; derate accordingly. Decouple VDD with 100nF ceramic + 10µF tantalum bulk capacitors placed within 5mm of the supply pins (pin 19 and 28, both VDD).
CERDIP-40 (600 mil body) is a through-hole package requiring 2.54mm (100 mil) pitch pad layout with 0.6mm drill holes; use a socket (e.g. 3M 400-40SX or Aries 40-0518) to facilitate UV erasure cycles during development. Keep high-speed signals (OSC1/OSC2, MCLR) short, and place a 1-10kΩ pull-up on MCLR with a 100nF decoupling capacitor. For analog ADC accuracy, separate AGND traces from digital GND and tie at a single ground star point near pin 18/29 GND. Avoid routing high-current motor drive traces under the CERDIP body to minimize coupled noise into ADC inputs.
The PIC18C452/JW CERDIP package has a thermal resistance of approximately 60°C/W (junction-to-ambient). At maximum core dissipation of ~500mW (40MHz, 5V, all peripherals active), junction temperature rise is ~30°C above ambient. Within the -40°C to +85°C industrial operating range, no heatsink is required. However, when driving heavy loads through I/O pins (e.g. 25mA per pin, source/sink), package dissipation can rise above 1W; in such cases, ensure ambient temperature is below 70°C or use lower drive currents.
Información de cumplimiento
PIC18C452/JW is a legacy EPROM/CERDIP part produced before widespread RoHS adoption. Lead content likely exceeds RoHS thresholds; CERDIP windowed parts historically carry lead exemption. AEC-Q100 not applicable as this part is not automotive qualified. Designers seeking RoHS/REACH compliance should migrate to flash-based PIC18F452-I/P or PIC18F46K22-I/P.
