Infineon Technologies CY7C63722C-XC

Overview

CY7C63722C-XC from Cypress Semiconductor is an 8-bit RISC OTP microcontroller integrating low-speed USB 2.0 and PS/2 peripheral control functions in a single die. It features an internal 6-MHz oscillator (±1.5% USB-tuned), 8 KB EPROM, 256-byte RAM, 16 GPIO pins with 50 mA sink capability per pin, and dual-mode D+/D–/SCLK/SDATA I/O. Used in cost-sensitive human-interface devices such as wired/wireless mice and gamepads requiring crystalless USB-PS/2 coexistence.

For engineers reviewing the CY7C63722C-XC datasheet, CY7C63722C-XC pinout, CY7C63722C-XC application, or CY7C63722C-XC equivalent, key selection criteria include internal oscillator accuracy for USB timing compliance, GPIO drive strength for direct LED/switch interfacing, dual-mode auto-configuration without external mode-switching logic, and 3.3 V regulated VREG output for USB pull-up resistor biasing.

Technical Context

The CY7C63722C-XC implements a Harvard-architecture RISC core running at 12 MHz CPU clock derived from internal or external 6-MHz reference. Its USB Serial Interface Engine (SIE) supports one device address and three endpoints (control + two data), fully compliant with USB HID 1.1 and low-speed USB 2.0 specifications.

Dual-mode operation is handled autonomously: D+/D– pins reconfigure as PS/2 SCLK/SDATA without GPIO intervention or external components; internal 3.3 V regulator powers the USB pull-up resistor; and wake-up timer enables periodic suspend-mode resumption without external circuitry.

Key Specifications

Pinout & Package

CY7C63722C-XC is supplied in bare die form (no package); bonding pad layout matches 25-pad configuration shown in datasheet Figure 5 (Page 5). All signals are accessed via wire-bond pads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C63723C-PC and CY7C63743C-PC, the CY7C63722C-XC offers smallest form factor (die), eliminates external timing components, and reduces system-level EMI via slow-edge-rate I/O - making it optimal for compact, cost-sensitive HID modules where board space and BOM count are critical.

Availability

CY7C63722C-XC is available at Aetrix Electronics and suitable for wired mice, gaming controllers, and industrial keypads requiring stable component supply, long-term lifecycle support, and die-level integration flexibility.

Supply support for CY7C63722C-XC 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) designs programmable system-on-chip solutions for USB, memory, and mixed-signal applications, headquartered in San Jose, CA.

The enCoRe™ USB product line targets cost-optimized human-interface devices, integrating USB/PS/2 protocol engines, RISC cores, and power management to minimize external components in peripheral designs.

FAQ

Does CY7C63722C-XC require an external crystal for USB compliance?

No. The device integrates a factory-trimmed internal oscillator that achieves ±1.5% accuracy over temperature and voltage, meeting USB low-speed timing requirements without any external crystal or resonator. External 6 MHz resonators are optional for higher precision but not required.

How is PS/2 mode activated without GPIO control?

PS/2 mode activates automatically when the host initiates PS/2 handshaking on the D–/SDATA and D+/SCLK pins. The internal logic detects valid PS/2 start conditions and reconfigures the transceiver, pull-ups, and interrupt routing - no firmware or GPIO involvement is needed.

Can VREG/P2.0 be used as a general-purpose input?

Yes. When the internal 3.3 V regulator is disabled via firmware register control, the VREG/P2.0 pin becomes a standard CMOS input (P2.0), supporting high-impedance sensing or level detection without affecting USB functionality during active operation.

What is the maximum continuous current per GPIO pin?

Each GPIO pin (P0.x and P1.x) is rated for 50 mA continuous sink current at VCC = 5 V and TA = 25°C. This allows direct driving of LEDs, small solenoids, or logic-level inputs without external drivers - verified per Absolute Maximum Ratings table on page 42 of datasheet 38-08022 Rev. *K.