Infineon Technologies CY7C63801-SXC

Overview

CY7C63801-SXC from Cypress Semiconductor is an 8-bit flash-programmable 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), HID v1.1, one device address, control + two data endpoints, and auto-configurable USB/PS/2 mode - used in optical mice, game pads, and barcode scanners.

For engineers reviewing the CY7C63801-SXC datasheet, CY7C63801-SXC pinout, CY7C63801-SXC application, or CY7C63801-SXC equivalent, key selection criteria include its crystalless operation, dual-regulator architecture, PS/2/USB dual-mode auto-switching without GPIO overhead, 24 MHz ±1.5% USB-tuned oscillator, and 8 KB flash with EEROM emulation for field firmware updates.

Technical Context

The CY7C63801-SXC implements a Harvard-architecture M8C CPU running at up to 24 MHz, with USB Serial Interface Engine (SIE) handling all protocol-layer tasks including token decoding, CRC generation/checking, and endpoint management. Its internal clock generator supports both crystalless operation and external 12/24 MHz reference input for USB timing compliance.

It integrates a dedicated 3.3 V regulator for USB D– pull-up and signal integrity, plus a separate 125 mA 3.3 V regulator for external peripherals. The device supports full USB suspend/resume with internal wakeup timer and low-power sleep (10 µA), while retaining programmable LVD, watchdog timer, and vectored interrupt controller with 22 sources.

Key Specifications

Pinout & Package

Package: 24-pin SOIC (Small Outline Integrated Circuit), 300 mil width, RoHS-compliant, lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C63802-SXC, the CY7C63801-SXC provides more I/O and native 3.3 V signaling for sensor integration; versus CP2102N, it delivers full embedded HID processing without external MCU dependency - critical for cost-sensitive, self-contained peripherals.

Availability

CY7C63801-SXC is available at Aetrix Electronics and suitable for optical mouse designs, gaming peripherals, point-of-sale terminals, and secure authentication dongles requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CY7C63801-SXC 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, USB controllers, and mixed-signal ICs for embedded applications.

The enCoRe™ II product line was designed specifically for cost-sensitive, low-speed USB HID peripherals - integrating oscillator, regulators, transceiver, and firmware infrastructure to minimize external components and accelerate time-to-market.

FAQ

Does CY7C63801-SXC require an external crystal to operate in USB mode?

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 or clock is optional and used only when higher precision is needed - for example, in systems requiring tighter synchronization across multiple USB devices.

Can CY7C63801-SXC be programmed in-circuit after soldering?

Yes. It supports in-system reprogrammability via its USB interface using Cypress's bootloader and PSoC Designer tools. No external programmer is required - firmware updates can be delivered over USB using vendor-specific class requests, enabling field upgrades and configuration changes without hardware access.

What is the maximum sink current capability of its GPIO pins?

Standard GPIO pins provide 8 mA sink current. Five designated pins (P0.0–P0.4) support programmable 50 mA sink current - confirmed in the DC Characteristics table (Section 74) of datasheet 38-08035 Rev. *T. This allows direct driving of LEDs, small relays, or buzzer circuits without external transistors.

How does the device handle USB suspend and resume events?

Upon USB bus suspend, CY7C63801-SXC enters low-power sleep mode drawing 10 µA. It wakes on USB resume, remote wakeup request, or internal wakeup timer expiration. The wakeup timer operates independently during suspend and requires no external components - enabling periodic polling or motion-triggered wake in HID devices like mice.