Infineon Technologies CY7C63723-PXC

Overview

CY7C63723-PXC from Cypress Semiconductor is an 8-bit RISC one-time-programmable (OTP) microcontroller integrating low-speed USB 2.0 and PS/2 interface logic, internal 6-MHz crystalless oscillator, 8 KB EPROM, 256-byte RAM, and 16 GPIO pins with 50 mA sink capability per pin. It operates from 4.0–5.5 V, supports auto-configuration between USB and PS/2 modes without external switching components, and targets human-interface devices such as optical mice and gamepads.

For engineers reviewing the CY7C63723-PXC datasheet, CY7C63723-PXC pinout, CY7C63723-PXC application, or CY7C63723-PXC equivalent, key selection criteria include dual-mode USB/PS/2 auto-detection, integrated 3.3V regulator for D– pull-up, 12-bit free-running timer with 128 µs/1.024 ms interrupts, four 8-bit input capture registers for RF timing, and 18-pin SOIC packaging.

Technical Context

The CY7C63723-PXC implements a Harvard-architecture RISC core with 12-MHz internal CPU clock derived from its integrated 6-MHz oscillator-tuned to ±1.5% accuracy for USB compliance. Its USB Serial Interface Engine (SIE) supports one device address and three endpoints (Control, Interrupt, Bulk), with D+/D– pins multiplexed as PS/2 SCLK/SDATA.

All I/O pins are individually configurable as CMOS outputs, open-drain, high-impedance inputs, or pull-up-enabled inputs; P0.0 and P0.1 serve as dedicated inputs to two independent 8-bit capture timers with rising/falling edge select and five prescaler options-enabling precise timing of wireless RF signal edges without external circuitry.

Key Specifications

Pinout & Package

Package: 18-pin Small Outline Integrated Circuit (SOIC), 0.300-inch body width, standard JEDEC MS-013AC footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-speed USB + PS/2 peripheral controller applications.

Compared with CY7C63743-PVC, CY7C63723-PXC offers identical dual-mode functionality in a smaller 18-pin footprint but lacks SPI and extended GPIO; versus PCF8574T, it provides complete self-contained USB/PS/2 control without host processor dependency-making it suitable for cost-sensitive, single-chip HIDs.

Availability

CY7C63723-PXC is available at Aetrix Electronics and suitable for optical mice, gaming peripherals, industrial keypads, and RF remote receivers requiring stable component supply and long-term production continuity.

Supply support for CY7C63723-PXC 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 USB, memory, and programmable system-on-chip solutions for embedded and human-interface applications.

The enCoRe™ USB product line was designed specifically to reduce component count in low-speed USB peripherals-integrating oscillator, regulator, transceiver, and dual-mode logic into a single OTP microcontroller for mice, keyboards, and game controllers.

FAQ

Does CY7C63723-PXC require an external crystal for USB operation?

No. The device features an integrated crystalless 6-MHz oscillator tuned to ±1.5% accuracy for USB low-speed timing compliance. An external 6-MHz ceramic resonator is optional for higher precision but not required-eliminating two passive components and associated PCB space.

How does dual-mode USB/PS/2 auto-configuration work without GPIO control?

Hardware detects bus activity: presence of USB SE0 signaling triggers USB mode; PS/2 clock pulses on D+/SCLK initiate PS/2 mode. No firmware intervention or GPIO pin assignment is needed-the transition is fully autonomous and transparent to application code.

Can CY7C63723-PXC drive LEDs directly without current-limiting resistors?

No. While each GPIO supports 50 mA sink, a series current-limiting resistor is mandatory to set forward current and prevent damage to the LED or I/O pin. The 50 mA rating defines maximum safe sink capability-not a constant-current source.

What is the role of VREG/P2.0, and can it be used as a general-purpose input?

VREG/P2.0 delivers a regulated 3.3V output to bias the external 1.3 kΩ pull-up resistor on D–. When not used for regulation, it functions as a standard digital input (P2.0) with internal pull-up option-confirmed in the pin definition table and functional overview.