Infineon Technologies CY7C63743-SC

Overview

CY7C63743-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 oscillator, 3.3V USB pull-up regulator (VREG/P2.0), 8 KB EPROM, 256-byte RAM, and 16 GPIO pins with 50 mA sink capability per pin. It enables dual-mode peripheral operation-such as optical mice and gamepads-without external crystals, mode-switching components, or dedicated GPIO for protocol selection.

For engineers reviewing the CY7C63743-SC datasheet, CY7C63743-SC pinout, CY7C63743-SC application, or CY7C63743-SC equivalent, key selection considerations include its crystalless USB timing compliance (±1.5% at 6 MHz), auto-configurable D+/D– pins supporting both USB differential signaling and PS/2 SCLK/SDATA, integrated brown-out reset at 3.75 V, and 24-pin SOIC/PDIP/QSOP package compatibility.

Technical Context

The CY7C63743-SC implements a Harvard-architecture RISC core with 12-MHz internal CPU clock derived from a tunable 6-MHz oscillator-calibrated to USB timing requirements without external crystal. Its USB Serial Interface Engine (SIE) supports one device address and three endpoints (Control, Interrupt, Bulk), while PS/2 mode uses the same D+/D– pins as SCLK/SDATA with internal pull-ups and activity-triggered interrupt.

Four 8-bit input capture registers (two per P0.0/P0.1) enable precise edge-timed event sampling for RF receiver interfaces; the 12-bit free-running timer provides 128 µs and 1.024 ms interrupt intervals; and the wake-up timer operates autonomously during USB suspend mode without external components.

Key Specifications

Pinout & Package

CY7C63743-SC is available in 24-pin SOIC, 24-pin PDIP, and 24-pin QSOP packages. All variants share identical pin mapping and electrical characteristics.

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-SC, CY7C63743-SC provides 16 GPIO and full pin compatibility across 24-pin packages, enabling richer peripheral features; versus AN11812, it delivers hardware-accelerated dual-mode operation with zero firmware overhead for protocol switching and timing-critical USB compliance.

Availability

CY7C63743-SC is available at Aetrix Electronics and suitable for optical mouse design, gaming peripheral development, and industrial keypad manufacturing requiring stable component supply and long-term production continuity.

Supply support for CY7C63743-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, and programmable system-on-chip solutions for embedded applications.

The enCoRe™ USB product line was designed specifically to reduce component count and bill-of-materials cost in low-speed USB peripherals-integrating oscillator, regulator, transceiver, and dual-mode logic into a single OTP microcontroller.

FAQ

Does CY7C63743-SC require an external crystal for USB operation?

No. The device features an internal 6-MHz oscillator calibrated to ±1.5% accuracy, meeting USB low-speed timing requirements without any external crystal or resonator. An external 6-MHz ceramic resonator may be used for tighter tolerance but is optional and not required for specification-compliant operation.

Can CY7C63743-SC operate in PS/2 mode without firmware changes when connected to a PS/2 host?

Yes. The device automatically detects PS/2 bus activity on D+/D– pins and transitions to PS/2 mode without firmware intervention. Internal pull-ups activate on both lines, and a dedicated interrupt signals PS/2 start condition-enabling seamless dual-mode support with no GPIO reconfiguration or mode-selection code.

What is the maximum sink current per GPIO pin, and is it safe to drive LEDs directly?

Each GPIO pin supports up to 50 mA sink current. This allows direct driving of standard 20 mA LEDs with appropriate series resistors (e.g., 150 Ω for 5 V VCC). Simultaneous sinking on multiple pins is limited by total package current (100 mA typical), so thermal derating and current sharing across ports must be verified per layout.

How does the internal wake-up timer function during USB suspend mode?

The internal wake-up timer operates autonomously during USB suspend, generating periodic interrupts (configurable interval) without CPU involvement or external components. It enables polling-free key detection in wireless keyboards or timed sensor sampling-reducing average current to <100 µA while retaining responsiveness to user input.