PIC16C65B-20I/P - 8-Bit 20MHz OTP MCU, 7KB EPROM, 40-PDIP | Microchip
MPN： PIC16C65B-20I/P ✓ 啟用中PIC16C65B-20I/P 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripheral interfaces on one die, forming the lowest tier of the embedded computing hierarchy (microcontroller -> embedded processor -> microprocessor -> computing platform). The PIC16CXX mid-range architecture uses a 14-bit instruction word with a RISC-style 35-instruction set, providing deterministic timing and code density advantages over CISC alternatives. OTP memory allows one-time field programming, which is well suited to mature production runs where code revision is no longer expected.
Key features of the PIC16C65B include two 8-bit timers plus one 16-bit timer, a USART for asynchronous/synchronous serial communication, an MSSP module supporting both SPI and I2C, an 8-bit parallel slave port, and a watchdog timer with its own on-chip RC oscillator for maximum reliability. Compared with its predecessor PIC16C65A, the B revision improves oscillator stability and adds enhanced in-circuit serial programming support per Microchip's compatibility chart.
The PIC16C65B-20I/P's 200 ns instruction execution combined with its 33 I/O pins makes it suited to industrial control panels, instrumentation front-ends, motor control driver boards, and embedded sensor hubs where deterministic interrupt latency and code simplicity outweigh the need for large RAM or in-system reprogrammability. Its wide 4.0-5.5 V supply window tolerates noisy industrial 5 V rails.
When designing with this part, note that OTP cannot be reprogrammed - firmware bugs cannot be patched after programming, so plan for code verification prior to volume programming. Use the MPLAB PM3 Universal Device Programmer or MPLAB ICD in-circuit debugger during development before committing to OTP. An external resonator or crystal with appropriate load capacitors is required for accurate clocking.
直接替換替代品，適用於 PIC16C65B-20I/P — 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： PIC16C65B-20I/P （相同外形與佔位） — 差異在於 Package, Timers, Program Memory Size, Core Architecture, Mounting Type.
PIC16C65A-20I/P
✅ 直接替換聯絡詢價
查看資料表 →PIC16C65B-04I/P
✅ 直接替換聯絡詢價
查看資料表 →PIC16C65B-04/PQ
✅ 直接替換聯絡詢價
查看資料表 →PIC16C65B-04I/PQ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC16C65AT-20I/P
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC16C65A-04I/P
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC16C65B-04E/P
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC16C65A-20I/PQ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC16C65B-20I/P 最大額定值與電氣特性
| Core Architecture | PIC16CXX mid-range 8-bit RISC |
| Program Memory (EPROM) | 7 KB (4K x 14-bit) |
| RAM | 192 bytes |
| Data EEPROM | 0 bytes (not present) |
| Maximum Clock Speed | 20 MHz |
| Instruction Execution Time | 200 ns (single cycle) |
| Instruction Set Size | 35 instructions (14-bit word) |
| Supply Voltage (Vdd) | 4.0 V to 5.5 V |
| 工作溫度 | -40 C to +85 C (Industrial) |
| I/O Pins | 33 |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Serial Interfaces | USART, SPI (MSSP), I2C (MSSP) |
| Parallel Slave Port | Yes (8-bit PSP) |
| Watchdog Timer | Yes (with dedicated on-chip RC) |
| 封裝 | 40-pin PDIP (through-hole, 0.600 in) |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Supply Current (typical) | 15 uA at 5 V/4 MHz; 1 uA at 3 V/32 kHz |
| 安裝類型 | Through-Hole (DIP) |
| RoHS 狀態 | Compliant |
PIC16C65B-20I/P 腳位配置
| 腳位 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| 腳位 2 | RA0/AN0 — PORTA bit 0 (digital I/O) |
| 腳位 3 | RA1/AN1 — PORTA bit 1 (digital I/O) |
| 腳位 4 | RA2/AN2 — PORTA bit 2 (digital I/O) |
| 腳位 5 | RA3/AN3/VREF — PORTA bit 3 / VREF (digital I/O) |
| 腳位 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input (digital I/O) |
| 腳位 7 | RA5/SS/AN4 — PORTA bit 5 / SPI Slave Select (digital I/O) |
| 腳位 8 | OSC1/CLKIN — Oscillator input / external clock |
| 腳位 9 | OSC2/CLKOUT — Oscillator output |
| 腳位 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 I/O (digital I/O) |
| 腳位 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 Osc / CCP2 (digital I/O) |
| 腳位 12 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 (digital I/O) |
| 腳位 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock (digital I/O) |
| 腳位 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data (digital I/O) |
| 腳位 15 | RC5/SDO — PORTC bit 5 / SPI data out (digital I/O) |
| 腳位 16 | RC6/TX/CK — PORTC bit 6 / USART TX / clock (digital I/O) |
| 腳位 17 | RC7/RX/DT — PORTC bit 7 / USART RX / data (digital I/O) |
| 腳位 18 | VSS — Ground reference |
| 腳位 19 | VDD — Positive supply (4.0-5.5 V) |
| 腳位 20 | RB0/INT — PORTB bit 0 / external interrupt (digital I/O) |
| 腳位 21 | RB1 — PORTB bit 1 (digital I/O) |
| 腳位 22 | RB2 — PORTB bit 2 (digital I/O) |
| 腳位 23 | RB3 — PORTB bit 3 (digital I/O) |
| 腳位 24 | RB4 — PORTB bit 4 (digital I/O) |
| 腳位 25 | RB5 — PORTB bit 5 (digital I/O) |
| 腳位 26 | RB6/PGC — PORTB bit 6 / ICSP clock (digital I/O) |
| 腳位 27 | RB7/PGD — PORTB bit 7 / ICSP data (digital I/O) |
| 腳位 28 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 (digital I/O) |
| 腳位 29 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 (digital I/O) |
| 腳位 30 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 (digital I/O) |
| 腳位 31 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 (digital I/O) |
| 腳位 32 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 (digital I/O) |
| 腳位 33 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 (digital I/O) |
| 腳位 34 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 (digital I/O) |
| 腳位 35 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 (digital I/O) |
| 腳位 36 | RE0/RD — PORTE bit 0 / PSP read control (digital I/O) |
| 腳位 37 | RE1/WR — PORTE bit 1 / PSP write control (digital I/O) |
| 腳位 38 | RE2/CS — PORTE bit 2 / PSP chip select (digital I/O) |
| 腳位 39 | VSS — Ground reference |
| 腳位 40 | VDD — Positive supply (4.0-5.5 V) |
典型應用
PIC16C65B-20I/P 適用於 7 應用s: Industrial Control Panels, Instrumentation Front-Ends, Motor Driver Controller Boards, Embedded Sensor Hubs, POS Terminal Peripherals, Security Keypads and Access Controllers, Automotive Aftermarket Modules.
Industrial Control Panels
The PIC16C65B-20I/P fits industrial control panels because its 33 I/O lines can directly drive relay coils, keypad matrices, and 7-segment LED displays without external multiplexing ICs. The 5 V supply tolerance handles the noisy 24 V-derived industrial bus, and the -40 C to +85 C industrial range covers cabinet environments. Its 200 ns deterministic interrupt latency ensures timely response to limit-switch and emergency-stop inputs. Compared to flash-based MCUs, OTP is acceptable because panel firmware is mature and rarely revised.
推薦
Instrumentation Front-Ends
In instrumentation front-ends, the PIC16C65B-20I/P serves as the system controller that drives LCD displays, scans keypads, and serializes measurement data via its USART to a host PC. The MSSP peripheral supports both SPI (for ADC/DAC chips) and I2C (for EEPROM/IO expanders), reducing external component count. Its 15 uA typical operating current at 4 MHz keeps heat dissipation negligible, important for precision analog front-ends where thermal gradients cause offset drift.
推薦
Motor Driver Controller Boards
The PIC16C65B-20I/P is well suited to stepper and brushed DC motor control boards where its 16-bit timer generates precise PWM carrier waveforms and the 8-bit timers handle encoder input capture. The parallel slave port allows high-bandwidth command injection from a host motion controller without burdening the USART. Its wide 4.0-5.5 V supply tolerates the inductive voltage transients from H-bridge switching when paired with proper snubbing. OTP is appropriate because motor-control firmware is version-locked at production.
推薦
Embedded Sensor Hubs
The PIC16C65B-20I/P aggregates multiple sensor inputs via I2C and SPI buses from external sensor ICs and repackages the data over its USART for transmission to a gateway or PLC. With 33 I/O and flexible peripheral mapping, it can simultaneously host a temperature sensor on I2C, an SPI pressure sensor, and several discrete switch inputs. The 1 uA sleep current at 32 kHz makes it practical for battery-backed sensor nodes that wake periodically to scan and report.
推薦
POS Terminal Peripherals
Point-of-sale peripherals such as receipt printer controllers, magnetic-stripe readers, and barcode scanner interfaces leverage the PIC16C65B-20I/P's combination of USART, SPI, and parallel slave port to bridge multiple IO types. The 200 ns instruction execution supports the real-time bit-banging often needed for legacy peripherals, and the wide operating voltage handles power-rail transients in shared electrical environments. Its 5 V logic is directly compatible with many older POS peripheral interfaces.
推薦
Security Keypads and Access Controllers
The PIC16C65B-20I/P powers standalone security keypads and access controllers where deterministic scan timing, low standby current, and long-term Microchip supply are valued. Its 33 I/O easily handles a 4x4 matrix keypad plus relay/buzzer outputs, while the USART enables logging to a central controller. The OTP memory prevents malicious firmware tampering after deployment - a security advantage over flash parts that can be rep-attacked. Industrial temperature range supports outdoor or unheated enclosures.
推薦
Automotive Aftermarket Modules
Although not AEC-Q100 qualified, the PIC16C65B-20I/P has historically been used in non-safety automotive aftermarket modules such as alarm systems, remote-start controllers, and dashboard accessories. Its wide 4.0-5.5 V supply tolerates 12 V battery transients when properly regulated, and the USART supports OBD-II diagnostic communication. For OEM automotive designs, AEC-Q100-qualified PIC18F variants are mandatory; this part suits hobbyist and retrofit applications only.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16C65B-20I/P — 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 | PIC16C65A-20I/P | PIC16C65B-04I/P | PIC16C65B-04/P | PIC16C65AT-20I/P |
|---|---|---|---|---|---|
| Package | PDIP-40 | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Memory | 7 KB (4K x 14) OTP EPROM | 7 KB OTP EPROM - same | 7 KB OTP EPROM - same | 7 KB OTP EPROM - same | 7 KB OTP EPROM - same |
| Maximum Clock Speed | 20 MHz | 20 MHz - same | 4 MHz (-80%) | 4 MHz (-80%) | 20 MHz - same |
| Instruction Cycle | 200 ns | 200 ns - same | 1000 ns | 1000 ns | 200 ns - same |
| RAM | 192 bytes | 192 bytes - same | 192 bytes - same | 192 bytes - same | 192 bytes - same |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C - same | -40 C to +85 C - same | 0 C to +70 C (Commercial) | -40 C to +85 C - same |
| I/O Pins | 33 | 33 - same | 33 - same | 33 - same | 33 - same |
| Lifecycle Status | Active | Active | Active | Active | Active |
主要差異化特點
- Wide 5 V industrial tolerance without LDO (對比PIC16C65A-20I/P)
- 33 I/O in 40-pin PDIP for direct legacy interface (對比PIC16C65B-04I/P)
- 5x faster than -04 speed grade at same price tier (對比PIC16C65B-04/P)
- Industrial temperature grade with same specs as commercial (對比PIC16C65B-04I/PQ)
設計說明
OTP (One-Time Programmable) EPROM cannot be erased or reprogrammed. A single bit error in your firmware forces scrap of the programmed device. Use a JW (windowed) ceramic package variant or an F-series flash equivalent (PIC16F77-I/P) during development and validation. Verify all firmware via MPLAB X simulation, hardware emulation with PICkit 3, and full regression testing before committing any PIC16C65B-20I/P to a programmer socket. Estimated cost impact: a single OTP mis-program can waste $5-8 in parts alone.
Place a 100 nF decoupling capacitor as close as possible to each VDD pin (pins 19 and 40), with a wide ground trace back to VSS (pins 18 and 39). For the 40-pin PDIP, both VDD/VSS pairs MUST be decoupled - the PIC16CXX core draws brief high-current spikes during instruction execution. A bulk 10 uF tantalum or ceramic capacitor on the main 5 V rail near the IC provides additional high-frequency energy storage. Keep the MCLR/VPP trace short and route it away from high-current switching nodes.
The OSC1/OSC2 crystal oscillator traces must be kept short (under 10 mm) and routed symmetrically to maintain duty cycle. Place load capacitors (typically 15-33 pF for a 20 MHz crystal) immediately adjacent to the oscillator pins, with their ground returns tied directly to the nearest VSS pin rather than a shared ground bus. For noisy environments, add a 100 ohm series resistor at OSC2 output to dampen overdrive. Failure to follow these guidelines can cause oscillator start-up failure or excessive EMI.
The PIC16C65B-20I/P operates from 4.0 V to 5.5 V. For designs deriving power from a 12 V or 24 V industrial bus, use a low-dropout linear regulator (e.g., Microchip MCP1700) or a small switching regulator with adequate filtering. The MCU itself draws only 15 uA typical at 5 V/4 MHz, but I/O drive current peaks during port transitions can reach 25 mA per pin (100 mA total per port) - size your regulator and traces accordingly. Estimated: 33 I/O x 4 mA average = 132 mA peak port current in worst-case simultaneous switching scenarios.
The Parallel Slave Port (PORTD + PORTE) operates as an 8-bit bus and is sensitive to reflections on traces longer than 50 mm. For long bus connections, add 33 ohm series damping resistors near the MCU pins, especially on the RD0-RD7 data lines. The PSP is rated for read/write rates up to the system clock divided by 2, but signal integrity typically limits practical cable length to under 200 mm without additional buffering. Use HC/HCT-series bus buffers (e.g., 74HCT245) for off-board expansion.
合規資訊
Per Microchip product page. Industrial temperature grade but NOT AEC-Q100 qualified - use PIC18F or dsPIC AEC-Q100 variants for automotive OEM designs. Lead-free PDIP package is RoHS compliant. REACH compliance per Microchip declaration.
