Infineon Technologies CY7C63743-SXC

Overview

CY7C63743-SXC from Cypress Semiconductor is an 8-bit RISC OTP microcontroller integrating low-speed USB 2.0 and PS/2 interface logic, internal 6-MHz oscillator, 8 KB EPROM, 256-byte RAM, and 16 GPIO pins with 50 mA sink capability per pin. It supports auto-configurable dual-mode operation without external mode-switching components and delivers 3.3 V regulated output for USB D– pull-up. Used in wired/wireless human-interface devices including optical mice and gamepads.

For engineers reviewing the CY7C63743-SXC datasheet, CY7C63743-SXC pinout, CY7C63743-SXC application, or CY7C63743-SXC equivalent, key selection considerations include integrated crystalless USB timing, PS/2/USB dual-mode auto-detection, 16 GPIO with programmable drive strength, 4× 8-bit input capture timers for RF signal edge timing, and 24-pin SOIC/PDIP/QSOP package compatibility.

Technical Context

The CY7C63743 implements a Harvard-architecture RISC core running at 12 MHz CPU clock derived from an internal 6-MHz oscillator (±1.5% USB-tolerant) or optional external 6-MHz ceramic resonator. Its USB Serial Interface Engine (SIE) supports one device address and three endpoints compliant with USB HID v1.1 and USB 2.0 low-speed spec.

PS/2 mode uses the same D+/D– pins as SCLK/SDATA with internal pull-ups and dedicated interrupt signaling; no GPIO is consumed for mode control. Four 8-bit input capture registers-two each tied to P0.0 and P0.1-enable precise edge-triggered timing for wireless receiver demodulation or encoder pulse analysis.

Key Specifications

Pinout & Package

Package: 24-pin SOIC, 24-pin PDIP, and 24-pin QSOP - all RoHS-compliant and pin-compatible variants of CY7C63743.

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 CY7C63723-SXC, CY7C63743-SXC provides 8 additional GPIO and full capture timer access-enabling richer peripheral functionality without external glue logic. Versus FT230XQ, it integrates full HID stack execution and dual-mode support, reducing total component count by ≥3 and eliminating host-side firmware development for basic HID devices.

Availability

CY7C63743-SXC is available at Aetrix Electronics and suitable for optical mice, wireless gamepads, industrial keypads, and POS terminal peripherals requiring stable component supply across extended production lifecycles.

Supply support for CY7C63743-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) designs high-performance mixed-signal ICs for USB, memory, and programmable systems, with headquarters in San Jose, CA.

CY7C63743 belongs to the enCoRe™ USB microcontroller family-engineered specifically to reduce component count in cost-sensitive HID peripherals by integrating USB/PS/2 protocol engines, oscillator, regulator, and robust GPIO into a single die.

FAQ

Does CY7C63743-SXC require an external crystal for USB compliance?

No. The device features an internal 6-MHz oscillator trimmed to ±1.5% accuracy-fully compliant with USB low-speed timing requirements. An external 6-MHz ceramic resonator is optional for tighter tolerance but not required. The oscillator eliminates crystal-related layout constraints and EMI concerns.

How does PS/2 mode auto-detection work without firmware intervention?

Hardware-level detection monitors bus activity on D+/D– pins: presence of PS/2 clock pulses (SCLK) triggers automatic mode switch within one instruction cycle. Internal pull-ups engage on both lines, and a dedicated interrupt signals PS/2 start condition-no GPIO or polling is needed.

Can the 50 mA GPIO pins drive standard LEDs directly?

Yes. Each GPIO pin sinks up to 50 mA continuously at VCC = 5 V, sufficient to drive common 20 mA LEDs with series resistor. For example, a 150 Ω resistor yields ~23 mA at 5 V-within safe operating limits and eliminating discrete driver transistors.

What is the role of the four input capture timers in wireless applications?

They record timestamps of rising/falling edges on P0.0 and P0.1 with 1 µs resolution (based on 1 MHz free-running timer). In 2.4 GHz RF receivers, this enables precise measurement of OOK/ASK preamble duration and inter-packet spacing-critical for reliable packet synchronization without host MCU involvement.