Infineon Technologies CY7C64355-48LTXC

Overview

CY7C64355-48LTXC from Infineon Technologies (formerly Cypress Semiconductor) is a full-speed USB 2.0 microcontroller with M8C Harvard-architecture core, 32 KB flash, 2048 bytes SRAM, and integrated USB transceiver supporting 12 Mbps operation without external crystal. It operates at up to 24 MHz CPU speed, supports 3.15–3.45 V or 4.35–5.25 V USB-supply ranges, and delivers 36 GPIO with hot-swappable Port 1 in 48-pin QFN package. Used in USB HID peripherals like industrial keypads and embedded human-interface devices.

For engineers reviewing the CY7C64355-48LTXC datasheet, CY7C64355-48LTXC pinout, CY7C64355-48LTXC application, or CY7C64355-48LTXC equivalent, key selection criteria include USB 2.0 TID# 40000893 compliance, crystal-less operation, programmable LDO on Port 1 (1.8/2.5/3.0 V), 10-bit ADC for battery monitoring, and I²C/SPI dual interface support with hardware address detection.

Technical Context

The device integrates a dedicated Serial Interface Engine (SIE) that handles USB protocol tasks-CRC generation/checking, token identification, ACK/NAK/Stall handshaking, and SOF frame counting-without firmware intervention. Its internal main oscillator (IMO) achieves ±0.25% accuracy when locked to USB data stream, eliminating need for external crystal.

System-level resources include three 16-bit timers, configurable I²C slave (50/100/400 kHz, no clock stretching, sleep-mode active <100 µA), SPI master/slave (46.9 kHz–12 MHz), and a temperature-sensor-coupled 10-bit ADC with integrator-based architecture and analog mux bus routing.

Key Specifications

Pinout & Package

Package: 48-pin QFN (7 mm × 7 mm, 0.5 mm pitch), thermally enhanced, RoHS-compliant, lead-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar full-speed USB microcontroller applications.

Compared with SLAB8051F32GQ and STM32F072CBT6, CY7C64355-48LTXC uniquely eliminates external crystal and USB PHY while delivering deterministic USB timing, lower system-level component count, and native hot-swap I/O-critical for compact, cost-sensitive HID peripherals.

Availability

CY7C64355-48LTXC is available at Aetrix Electronics and suitable for industrial keypads, medical sensor dongles, USB HID game controllers, and USB-C docking adapters requiring stable component supply across extended product lifecycles.

Supply support for CY7C64355-48LTXC 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, specializing in power management, automotive, industrial, and USB connectivity solutions.

This device belongs to the enCoRe™ V family-designed specifically for cost-sensitive, single-chip USB peripheral implementations where crystal-less operation, low-power sleep, and hot-swappable I/O reduce system complexity and bill-of-materials cost.

FAQ

Does CY7C64355-48LTXC require an external crystal for USB 2.0 compliance?

No. The device uses an internal main oscillator (IMO) that locks to the USB data stream, achieving ±0.25% frequency accuracy without any external crystal or resonator. This satisfies USB 2.0 full-speed timing requirements (TID# 40000893) and simplifies PCB layout and BOM.

What is the maximum sink/source current capability per GPIO on CY7C64355-48LTXC?

Each GPIO supports 25 mA sink current. Total sink limits are 60 mA on even-port pins, 60 mA on odd-port pins, and 120 mA across all GPIOs. Source current is –5 mA on Ports 0–1 and –1 mA on Ports 2–4, with 20 mA total source capability. These values are specified under recommended operating conditions in the datasheet.

Can the 10-bit ADC be used independently of the on-die temperature sensor?

Yes. The ADC can be configured to accept external analog inputs via the analog mux bus instead of the default temperature sensor connection. Input voltage range is 0 V to VREFADC, and conversion resolution is programmable via timer-controlled integration cycles-enabling accurate battery voltage or sensor signal monitoring.

How does hot-swappable capability on Port 1 function electrically?

Port 1 pins feature integrated protection circuitry-including overvoltage tolerance, ESD clamping, and slew-rate control-that allows safe insertion/removal while powered. The programmable LDO (1.8/2.5/3.0 V) and configurable input threshold further ensure reliable logic-level transitions during dynamic connection events-critical for docking stations and modular peripherals.