Infineon Technologies CY7C63723-SC

Overview

CY7C63723-SC from Cypress Semiconductor is an 8-bit RISC OTP microcontroller integrating low-speed USB 2.0 and PS/2 interface logic, internal 6-MHz crystalless oscillator, 3.3V USB pull-up regulator (VREG/P2.0), 8 KB EPROM, 256-byte RAM, and up to 16 GPIO pins with 50 mA sink capability-designed for dual-mode human interface devices including wired/wireless mice and gamepads operating from 4.0–5.5 V at 0°C–70°C.

For engineers reviewing the CY7C63723-SC datasheet, CY7C63723-SC pinout, CY7C63723-SC application, or CY7C63723-SC equivalent, this page delivers verified technical context on auto-configurable USB/PS/2 mode switching, integrated wake-up timer, capture timers for RF input timing, SPI master/slave support, and GPIO interrupt masking-all without external mode-selection components or crystal.

Technical Context

The CY7C63723-SC implements a Harvard-architecture 8-bit RISC core with 12-MHz internal CPU clock derived from a tunable 6-MHz internal oscillator (±1.5% USB-compliant accuracy) or optional external 6-MHz ceramic resonator. It embeds a full USB Serial Interface Engine (SIE) supporting one device address and three endpoints (Control, Interrupt, Bulk), plus native PS/2 protocol handling via shared D+/SCLK and D–/SDATA pins.

Its I/O subsystem includes two configurable ports (P0.0–P0.7, P1.0–P1.7), each pin supporting CMOS output, open-drain, high-impedance input, or internal pull-up; P0.0 and P0.1 feed dedicated 8-bit input capture timers with five prescaler options and edge-selectable rising/falling detection-enabling precise timing of wireless RF signals without firmware overhead.

Key Specifications

Pinout & Package

Package: 18-pin SOIC (CY7C63723-SC) and 18-pin PDIP. Pin functions validated per Cypress Document #38-08022 Rev. *B.

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 AN1083A and SLG46537V, the CY7C63723-SC uniquely integrates USB/PS/2 protocol engines, crystalless timing, and 3.3 V regulation-delivering a complete, firmware-executable HID peripheral solution in one die without external mode management or voltage translation.

Availability

CY7C63723-SC is available at Aetrix Electronics and suitable for wired/wireless human interface devices, industrial keypad terminals, and POS peripheral adapters requiring stable component supply, long-lifecycle support, and drop-in replacement capability for legacy Cypress enCoRe™ designs.

Supply support for CY7C63723-SC 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 USB, memory, PSoC, and connectivity solutions for embedded systems since 1982.

The CY7C637xx enCoRe™ USB family was designed specifically to reduce component count and design complexity in low-speed USB/PS/2 human interface devices-targeting mice, keyboards, gamepads, and industrial control peripherals.

FAQ

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

No. The device features an integrated crystalless 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-enabling full USB functionality with zero external timing components.

How does automatic USB/PS/2 mode switching work without GPIO control?

Mode selection is handled entirely in hardware: the USB transceiver detects bus activity on D+/D–, while PS/2 activity is identified by clock/data handshake patterns on the same pins. No firmware intervention or GPIO configuration is needed-the internal logic routes signals and enables appropriate pull-ups automatically.

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

VREG/P2.0 provides a regulated 3.3 V output to drive the mandatory 1.3 kΩ USB pull-up resistor on D–. When USB regulation is disabled (via firmware register), the pin reverts to a standard CMOS input (P2.0), allowing use as a general-purpose signal monitor without additional I/O allocation.

Can the CY7C63723-SC support custom HID descriptors beyond standard mouse/gamepad reports?

Yes. Its 8 KB EPROM and flexible firmware architecture allow implementation of vendor-defined HID descriptors-including custom usage pages, feature reports, and multi-interface configurations-as confirmed by Cypress application note AN2131 and CYASM toolchain support.