Infineon Technologies CY7C63803-LQXC

Overview

CY7C63803-LQXC from Cypress Semiconductor is an 8-bit flash-programmable enCoRe™ II low-speed USB peripheral controller with integrated USB transceiver, crystalless 24 MHz oscillator, dual 3.3 V regulators (125 mA main + dedicated USB PHY), and up to 20 GPIO pins. It supports USB 2.0 (TID #40000085) and PS/2 dual-mode operation without external mode-switching components, targeting HID peripherals operating from 4.0–5.5 V at 0–70 °C.

For engineers reviewing the CY7C63803-LQXC datasheet, CY7C63803-LQXC pinout, CY7C63803-LQXC application, or CY7C63803-LQXC equivalent, key selection criteria include its USB/PS2 auto-configuration capability, internal 24 MHz ±1.5% oscillator tolerance, 8 KB flash + 256 B RAM memory map, 2-channel 8-bit capture timer for RF edge timing, and 3.3 V I/O compatibility with configurable 50 mA sink on designated pins.

Technical Context

The device implements a Harvard-architecture M8C CPU running at up to 24 MHz, with USB Serial Interface Engine (SIE) handling all protocol-layer tasks including endpoint 0 (control), endpoint 1 (IN), and endpoint 2 (OUT) management. Its clock architecture supports internal crystalless oscillation or external 12/24 MHz reference for USB timing compliance.

It integrates a dedicated 3.3 V regulator for USB signaling (D– pull-up), a separate 125 mA 3.3 V regulator for external peripherals, and programmable low-voltage detection with interrupt capability. The 12-bit programmable interval timer and 16-bit free-running timer with dual-edge capture registers enable precise timing in wireless sensor and optical encoder interfaces.

Key Specifications

Pinout & Package

Package: 24-pin QFN Sawn (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant, moisture-sensitive level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-speed USB peripheral controller applications.

Compared with CY7C63802-LQXC, the CY7C63803-LQXC provides double flash capacity and EEROM emulation for persistent settings-critical for adaptive HID devices. Versus CY7C63804-LQXC, it offers identical functionality in a smaller footprint and lower cost where 20 GPIOs suffice.

Availability

CY7C63803-LQXC is available at Aetrix Electronics and suitable for optical mouse interface, gaming joystick, barcode scanner module, and security dongle applications requiring stable component supply across industrial and consumer production cycles.

Supply support for CY7C63803-LQXC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in programmable system-on-chip solutions for USB, memory, and mixed-signal applications.

The enCoRe™ II product line was designed specifically for cost-sensitive, low-power USB peripheral devices-eliminating external crystals, regulators, and pull-up resistors while maintaining full USB-IF certification and dual-mode PS/2 compatibility.

FAQ

Does CY7C63803-LQXC require an external crystal for USB operation?

No. The device features a factory-trimmed internal 24 MHz oscillator with ±1.5% accuracy over temperature and voltage, fully compliant with USB Low-Speed timing requirements. An external crystal is optional only for higher precision or non-USB clocking needs.

Can CY7C63803-LQXC operate in both USB and PS/2 modes simultaneously?

No-it operates in either USB or PS/2 mode, but auto-detects and configures itself during enumeration or power-up based on host handshake signals. No firmware or GPIO intervention is required to switch modes, and the same hardware design supports both protocols.

What is the maximum sink current capability of GPIO pins on CY7C63803-LQXC?

Designated GPIO pins support configurable sink current of up to 50 mA per pin, while all GPIOs provide 2 mA source current. This allows direct driving of LEDs, small relays, or optocouplers without external drivers-reducing bill-of-materials in HID peripheral designs.

How does the capture timer function support RF remote control applications?

The 2-channel 8-bit capture timer independently records rising and falling edge timestamps on two input pins. This enables precise measurement of pulse widths and intervals in NEC or RC-5 IR protocols, allowing the device to decode commands without external timing ICs or microcontroller polling overhead.