Infineon Technologies CY7C68000A-56LTXC

Overview

CY7C68000A-56LTXC from Cypress Semiconductor is a USB 2.0 UTMI-compliant transceiver IC supporting both High-Speed (480 Mbps) and Full-Speed (12 Mbps) operation, with integrated 1.5 kΩ DPLUS pull-up, on-chip PLL, and internal USB line termination. It interfaces directly to Intel Monahans application processors via an 8-bit @ 60 MHz or 16-bit @ 30 MHz parallel bus and operates at 3.3 V.

For engineers reviewing the CY7C68000A-56LTXC datasheet, CY7C68000A-56LTXC pinout, CY7C68000A-56LTXC application, or CY7C68000A-56LTXC equivalent, key selection considerations include UTMI interface compliance, dual-speed signaling support, tristate-enabled bus sharing, internal clock recovery, and package-specific pin mapping for QFN-56.

Technical Context

The CY7C68000A implements a full-featured UTMI+ Level 1 physical layer transceiver with synchronous field and EOP detection/generation, NRZI encoding/decoding, and bit stuffing/unstuffing logic. Its on-chip PLL locks to a 24 MHz ±100 ppm crystal to generate precise 30 MHz (16-bit mode) or 60 MHz (8-bit mode) parallel interface clocks.

It supports three operational modes via OpMode[1:0]: normal data transfer (00), soft disconnect (01), and NRZI/bitsstuff bypass (10). LineState[1:0] outputs provide real-time, CLK-synchronized USB differential line state (J/K/SE0/SE1), while Tri_state enables full I/O tristating only during Suspend mode.

Key Specifications

Pinout & Package

Package: 56-pin QFN (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant, lead-free. Pinout validated per Cypress Document #38-08052 Rev. *H, Page 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 2.0 UTMI transceiver applications.

Compared with SMSC USB3317C and Microchip USB2502, the CY7C68000A offers unique tristate-enabled UTMI bus sharing, Monahans-optimized timing, and dedicated test modes-making it optimal for mobile SoC coexistence and debug-critical designs where discrete PHY control is essential.

Availability

CY7C68000A-56LTXC is available at Aetrix Electronics and suitable for smartphone baseband interfaces, DSL modem host extensions, portable media player docking systems, and wireless LAN USB adapters requiring stable component supply and long-term industrial availability.

Supply support for CY7C68000A-56LTXC 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 programmable system-on-chip (PSoC), memory, and USB connectivity solutions for embedded systems.

The MoBL-USB™ TX2 product line was designed specifically to deliver low-power, high-integration USB 2.0 physical layer transceivers for mobile and portable applications, with emphasis on SoC interface simplicity and UTMI compliance.

FAQ

What is the function of the Tri_state pin, and when can it be activated?

The Tri_state pin enables full tristating of all I/Os and outputs, allowing the UTMI bus to be shared with other devices. It is only functional when the device is in Suspend mode (Suspend = 1). Activation occurs within ~50 ns of Tri_state assertion, and deactivation restores drive within ~50 ns. Unused inputs must be tied HIGH or LOW to prevent floating.

Does CY7C68000A-56LTXC require an external crystal, and what are its specifications?

Yes - it requires a 24 MHz ±100 ppm parallel-resonant, fundamental-mode crystal with 27–33 pF load capacitance and ≤500 μW drive level. The crystal connects between XTALIN and XTALOUT. An external 24 MHz square wave may substitute for XTALIN if XTALOUT is left open, but crystal operation is preferred for jitter-sensitive HS links.

How does the CY7C68000A handle USB High-Speed versus Full-Speed selection?

FS/HS selection uses two independent controls: XcvrSelect chooses the transceiver (0 = HS, 1 = FS), while TermSelect configures termination (0 = HS termination/SE0, 1 = FS termination/1.5 kΩ pull-up). Both signals must be coordinated - e.g., HS operation requires XcvrSelect = 0 and TermSelect = 0 - to meet USB 2.0 electrical compliance.

Can CY7C68000A-56LTXC operate in Low-Speed (1.5 Mbps) USB mode?

No - the CY7C68000A does not support Low-Speed USB signaling. Its transceiver architecture is optimized exclusively for Full-Speed (12 Mbps) and High-Speed (480 Mbps) modes per USB 2.0 specification. LS mode is explicitly excluded in the functional overview and electrical characterization.