PIC16C64AT-10I/L - 8-Bit 10MHz OTP MCU 3.5KB 44-PLCC | Microchip
MPN: PIC16C64AT-10I/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.4 | $4,200.00 |
| 1,000 | $7.2 | $7,200.00 |
PIC16C64AT-10I/L Overview
A PIC16C-series microcontroller is a member of the Microchip 8-bit CMOS RISC family that executes most instructions in a single cycle, providing deterministic timing and high code density. These microcontrollers sit within the broader hierarchy of microcontroller -> embedded controller -> semiconductor device, and are designed for cost-sensitive, deterministic control applications where legacy code bases or simple peripheral integration are priorities.
Key features of the PIC16C64AT-10I/L include 33 digital I/O pins, an integrated analog comparator, a watchdog timer, and support for both parallel and serial programming of the OTP memory. The Harvard architecture separates program and data buses, enabling simultaneous instruction fetch and data access, while the RISC instruction set of 35 single-word instructions reduces learning curve and code overhead.
The device uses CMOS technology and is fully static, allowing the clock to be stopped without losing internal state. Operating voltage typically ranges from 4.0V to 6.0V, with low-power sleep mode support. The 44-pin PLCC package provides mechanical robustness for through-hole and socket-based prototyping while remaining compatible with surface-mount assembly when used with PLCC sockets.
Typical applications include industrial control systems, motor control interfaces, sensor signal conditioning, legacy embedded products, and prototyping platforms where the OTP memory offers cost advantages over flash-based alternatives. The wide I/O count makes it suitable for keypad scanning, LED display driving, and parallel peripheral interfacing.
When designing with this part, note that OTP memory cannot be erased or reprogrammed, so firmware must be fully validated before programming. Consider migration paths to flash-based PIC16F equivalents (e.g., PIC16F77) for new designs where in-circuit reprogrammability reduces development cycle time.
This page synthesizes distributor pricing, verified alternatives in the same 44-PLCC package, and practical design notes for engineers evaluating or maintaining legacy designs based on the PIC16C64A family.
Drop-in alternatives for PIC16C64AT-10I/L — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16C64AT-10I/L (same form factor and footprint) — differing in Package, Program Memory Size, RAM Size, Operating Temperature Range, Program Memory Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C64AT-10/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C64A-10I/L
✅ Drop-In✓ In Stock
$3.45 / Unit
View Datasheet →PIC16C64AT-10E/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.55 / Unit
View Datasheet →PIC16C65A-10I/L
✅ Drop-In✓ In Stock
$8.2 / Unit
View Datasheet →PIC16C64A-10E/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.85 / Unit
View Datasheet →PIC16C64A-20I/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.1 / Unit
View Datasheet →PIC16C64AT-10I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit RISC (PIC16C) |
| Core Clock Speed (Max) | 10 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 bytes |
| Data EEPROM | 0 bytes |
| I/O Pins | 33 |
| Package | 44-pin PLCC (QCCJ, J-Lead) |
| Package Dimensions | 16.59 x 16.59 mm |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial |
| Operating Temperature Range | -40C to +85C |
| Instruction Set | 35 single-word instructions |
| RoHS Status | Non-compliant (legacy OTP, lead-containing) |
PIC16C64AT-10I/L Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / analog input |
| Pin 2 | RA1/AN1 — PORTA bit 1 / analog input |
| Pin 3 | RA2/AN2 — PORTA bit 2 / analog input |
| Pin 4 | RA3/AN3/VREF — PORTA bit 3 / analog input / voltage reference |
| Pin 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 6 | RA5/SS/AN4 — PORTA bit 5 / SPI slave select / analog input |
| Pin 7 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Pin 8 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Pin 9 | MCLR/VPP — Master clear reset / programming voltage input |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 13 | RB1 — PORTB bit 1 |
| Pin 14 | RB2 — PORTB bit 2 |
| Pin 15 | RB3 — PORTB bit 3 |
| Pin 16 | RB4 — PORTB bit 4 |
| Pin 17 | RB5 — PORTB bit 5 |
| Pin 18 | RB6 — PORTB bit 6 |
| Pin 19 | RB7 — PORTB bit 7 |
| Pin 20 | VSS — Ground reference |
| Pin 21 | RC0 — PORTC bit 0 |
| Pin 22 | RC1 — PORTC bit 1 |
| Pin 23 | RC2 — PORTC bit 2 |
| Pin 24 | RC3 — PORTC bit 3 |
| Pin 25 | RC4 — PORTC bit 4 |
| Pin 26 | RC5 — PORTC bit 5 |
| Pin 27 | RC6 — PORTC bit 6 |
| Pin 28 | RC7 — PORTC bit 7 |
| Pin 29 | VSS — Ground reference |
| Pin 30 | RD0 — PORTD bit 0 |
| Pin 31 | RD1 — PORTD bit 1 |
| Pin 32 | RD2 — PORTD bit 2 |
| Pin 33 | RD3 — PORTD bit 3 |
| Pin 34 | RD4 — PORTD bit 4 |
| Pin 35 | RD5 — PORTD bit 5 |
| Pin 36 | RD6 — PORTD bit 6 |
| Pin 37 | RD7 — PORTD bit 7 |
| Pin 38 | VSS — Ground reference |
| Pin 39 | RE0/RD — PORTE bit 0 / read control |
| Pin 40 | RE1/WR — PORTE bit 1 / write control |
| Pin 41 | RE2/CS — PORTE bit 2 / chip select |
| Pin 42 | VSS — Ground reference |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16C64AT-10I/L is suitable for 6 applications: Industrial Control Systems, Legacy Embedded Product Maintenance, Sensor Signal Conditioning and Interfacing, Keypad and Display Interfaces, Motor Control Interfacing, Serial Communication Bridges.
Industrial Control Systems
The PIC16C64AT-10I/L is well suited for industrial control applications requiring deterministic response and a high I/O count. With 33 digital I/O pins, the MCU can directly interface to relays, solenoids, switches, and indicator LEDs without external I/O expanders. The 10 MHz core delivers 10 MIPS throughput, sufficient for closed-loop control loops running at 1 kHz or higher. The industrial temperature grade (-40C to +85C) ensures operation in factory-floor enclosures. The RISC instruction set with 35 single-word instructions allows compact, predictable code ideal for motor control interlocks, conveyor sequencing, and PLC sub-system replacement. Designers should note the OTP memory constraint: firmware must be fully validated before programming, making this part best for high-volume, fixed-function products rather than iterative development.
Recommended
Legacy Embedded Product Maintenance
The PIC16C64AT-10I/L remains in use for maintenance and repair of legacy embedded products where original firmware is locked into OTP. With 3.5KB of program memory and 128 bytes of RAM, the device can host substantial control algorithms typical of 1990s-era industrial and consumer designs. The 44-PLCC package allows socketed replacement during field service. Sourcing through authorized distributors and aftermarket brokers is critical given the part's obsolete status. For re-design of legacy products, the flash-based PIC16F77-I/L in the same 44-PLCC package provides pin-compatible drop-in replacement with the added benefit of in-circuit reprogrammability, eliminating the OTP development bottleneck.
Recommended
Sensor Signal Conditioning and Interfacing
The PIC16C64AT-10I/L's 33 I/O pins and integrated analog comparator make it suitable for sensor signal conditioning front-ends that digitize analog inputs and drive actuators. The 10 MIPS core can sample multiple analog channels via external ADC, perform linearization and thresholding, and output control signals to relays or PWM drivers. Industrial temperature grade supports deployment in unheated enclosures. The Harvard architecture with separate program and data buses ensures deterministic timing for time-critical sensor reads. Note: the part lacks an internal ADC, so external ADC ICs such as MCP3002 or MCP3008 are typically paired for multi-channel analog acquisition. Verify I/O pin assignments against the 44-PLCC datasheet pinout before layout.
Recommended
Keypad and Display Interfaces
The 33 digital I/O pins of the PIC16C64AT-10I/L easily accommodate 4x4 matrix keypads (8 pins) plus multiplexed 7-segment or 14-segment displays (typically 12-16 pins), with leftover I/O for status LEDs and serial communications. The 10 MHz core provides sufficient throughput for switch debouncing, scan routines, and display refresh at 100+ Hz without visible flicker. RISC single-cycle instructions enable efficient row-column scanning and BCD-to-7-segment conversion. The OTP memory is cost-effective for fixed-interface products like appliance controllers, security keypads, and access control panels. The 44-PLCC package is robust for consumer device housings and supports both through-hole and socketed assembly.
Recommended
Motor Control Interfacing
The PIC16C64AT-10I/L can serve as the supervisory controller in motor drive systems, generating PWM signals, reading encoder feedback, and implementing safety interlocks. With 33 I/O pins, the MCU interfaces directly to H-bridge drivers, current sense amplifiers, and Hall-effect sensors without external logic. The 10 MHz core supports 10 kHz PWM update rates with adequate cycle time for control loop computation. The industrial temperature range ensures operation in motor housing environments. The OTP memory is appropriate for fixed motor profiles such as fans, pumps, and small appliance drives. For variable-speed drives requiring field tuning, the flash-based PIC16F77-I/L offers in-circuit reprogrammability for parameter adjustments.
Recommended
Serial Communication Bridges
The PIC16C64AT-10I/L with its PIC16C6X core implements USART and I2C/SPI peripherals in software or via dedicated hardware modules, enabling it to function as a protocol bridge between incompatible serial devices. The 10 MHz core and 128 bytes of RAM handle typical UART-to-SPI or UART-to-I2C translation tasks with adequate buffer capacity. The 33 I/O pins allow multiple serial ports (e.g., two UARTs plus one SPI) with handshake lines. The OTP memory locks the bridge firmware for reliable, tamper-proof operation in industrial gateways. Verify peripheral availability against the specific PIC16C64A datasheet, as some variants include hardware USART while others require bit-banged implementation.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C64AT-10I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C64AT-10/L | PIC16C64A-10I/L | PIC16C65A-10I/L | PIC16C64A-20I/L |
|---|---|---|---|---|---|
| Package | 44-PLCC (QCCJ) | 44-PLCC (QCCJ) - same | 44-PLCC (QCCJ) - same | 44-PLCC (QCCJ) - same | 44-PLCC (QCCJ) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Clock (Max) | 10 MHz | 10 MHz | 10 MHz | 10 MHz | 20 MHz |
| Program Memory | 3.5 KB (2K x 14) OTP | 3.5 KB OTP | 3.5 KB OTP | 7 KB OTP | 3.5 KB OTP |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 192 bytes | 128 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| Packaging Form | Tape & Reel | Tape & Reel | Tube | Tube | Tube |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Wide I/O count in 44-PLCC package (vs PIC16C63A-20I/SP)
- Industrial temperature grade option (vs PIC16C64AT-10/L)
- Larger program memory than PIC16C6X siblings (vs PIC16C62A-10I/SO)
Design Notes
The PIC16C64AT-10I/L uses OTP (One-Time Programmable) memory that cannot be erased or rewritten. Once programmed, the device is locked. Do not use this part for development or prototyping where firmware iteration is required. For development workflows, use a flash-based equivalent such as PIC16F77-I/L (same 44-PLCC package, 3.5KB flash, 10 MHz) and only migrate to the OTP version for production runs where code is fully validated and locked.
The 44-pin PLCC package (QCCJ, J-lead) requires careful PCB layout to avoid solder joint stress. Place a PLCC socket (e.g., 44-pin DIP-to-PLCC adapter) for prototype work to allow easy device replacement. For production, follow IPC-2221 land pattern guidelines for PLCC J-leads: 0.040 x 0.040 inch pads with 0.020 inch lead-free solder reflow. Decoupling: place 0.1uF ceramic and 10uF tantalum capacitors within 5mm of VDD (pin 11) and VSS (pin 10) to suppress switching noise.
Estimated: At 10 MHz operation and 5V VDD, the PIC16C64AT-10I/L typical supply current is approximately 5-10 mA active and 1-5 uA in sleep mode (per PIC16C6X family typical characteristics). Add a 10uF bulk capacitor and 0.1uF bypass capacitor at the VDD pin to handle inrush during oscillator startup. For low-power designs, use the SLEEP instruction and wake on interrupt or watchdog timeout; the brown-out reset and power-on reset circuits are internal. Consult the official PIC16C6X datasheet (DS30261D) for exact current consumption curves across temperature and frequency.
Route the crystal oscillator traces (OSC1 pin 7, OSC2 pin 8) as short as possible and place the crystal within 10mm of the MCU. Use a ground guard ring around the crystal traces to reduce EMI. For high-speed designs (>4 MHz), consider a 4-layer PCB with a dedicated ground plane to minimize noise coupling into analog inputs (RA0-RA5). Keep the MCLR/VPP pin (pin 9) trace short to the reset circuit; add a 10 kohm pull-up to VDD for reliable operation.
Compliance Information
Legacy PIC16C OTP family is not RoHS compliant due to lead-containing solder terminations. Part is obsolete per Microchip lifecycle status. For RoHS-compliant designs, migrate to PIC16F77-I/L flash-based equivalent.
