Infineon Technologies CY7C63823-QXC

Overview

CY7C63823-QXC from Cypress Semiconductor is an enCoRe™ II 8-bit flash microcontroller with integrated low-speed USB 2.0 and PS/2 interface, Harvard architecture M8C CPU running up to 24 MHz, 8 KB flash, 256 bytes RAM, and crystalless internal oscillator certified by USB-IF (TID #40000085). It supports one USB device address, control + two data endpoints, and operates in USB or PS/2 mode without external switching components.

For engineers reviewing the CY7C63823-QXC datasheet, CY7C63823-QXC pinout, CY7C63823-QXC application, or CY7C63823-QXC equivalent, key selection considerations include its dual-mode USB/PS/2 auto-configuration, integrated 3.3 V USB PHY regulator and D– pull-up, 20 GPIO with configurable drive strength (up to 50 mA sink), and 12-bit programmable interval timer for precise timing in HID peripherals.

Technical Context

The device implements a dedicated low-speed USB Serial Interface Engine (SIE) compliant with USB 2.0 and HID 1.1, supporting only one device address and three endpoints (0, 1, 2) with fixed IN/OUT direction per endpoint. Its internal 24 MHz oscillator achieves ±1.5% accuracy during USB traffic, optionally lockable to external 12/24 MHz clock for tighter timing.

It features dual operating modes: USB and PS/2 - selected automatically via bus detection, requiring no GPIO configuration or external mode-select circuitry. The 3.3 V I/O domain includes four pins with CMOS/TTL compatibility, open-drain support, and internal pull-ups, while the 125 mA 3.3 V regulator powers external peripherals.

Key Specifications

Pinout & Package

CY7C63823-QXC is housed in a 24-pin QSOP package (body width 3.9 mm, lead pitch 0.635 mm), RoHS-compliant, with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C63822-QXC, CY7C63823-QXC provides full 20-GPIO flexibility and 3.3 V I/O for mixed-voltage sensor interfaces; versus CY7C63824-QXC, it offers cost-optimized commercial-temperature operation without sacrificing USB/PS/2 dual-mode functionality or in-system programming.

Availability

CY7C63823-QXC is available at Aetrix Electronics and suitable for optical mouse design, gaming peripheral development, and secure USB dongle production requiring stable component supply across multi-year product lifecycles.

Supply support for CY7C63823-QXC 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 U.S.-based semiconductor company specializing in programmable system-on-chip solutions, USB controllers, and mixed-signal ICs for human interface and embedded applications.

CY7C63823-QXC belongs to the enCoRe™ II family-designed specifically to reduce bill-of-materials in USB and PS/2 HID peripherals by integrating oscillator, regulators, pull-up resistors, and dual-mode transceivers into a single 8-bit MCU.

FAQ

Does CY7C63823-QXC support full-speed USB?

No. CY7C63823-QXC is strictly a low-speed USB 2.0 device (1.5 Mbps) and does not support full-speed (12 Mbps) or high-speed modes. Its USB transceiver, SIE, and timing architecture are optimized exclusively for LS USB compliance and HID class operation.

Can the internal oscillator meet USB timing requirements without external calibration?

Yes. The internal 24 MHz oscillator achieves ±1.5% accuracy during active USB traffic, satisfying USB low-speed timing specifications. No external trimming or calibration is needed for standard operation, though an external 12/24 MHz clock may be used for enhanced precision.

How many endpoints does CY7C63823-QXC support, and are they configurable?

It supports exactly three endpoints: control endpoint 0 (bidirectional), endpoint 1 (IN-only), and endpoint 2 (OUT-only). These are fixed in direction and function per USB specification; no runtime reconfiguration is supported-the SIE handles them autonomously.

Is in-system programming possible without a dedicated programmer header?

Yes. Firmware updates are performed over the native USB interface using Cypress's bootloader protocol. No external JTAG or SWD interface is required-only standard USB cable and host-side utility software (e.g., Cypress USB Programmer or custom HID updater).