CY7C65620-56LFXAT Cypress Semiconductor Corp, CY7C65620-56LFXAT Datasheet - Page 4

• Manufacturer Part Number: CY7C65620-56LFXAT
• Description: CY7C65620-56LFXAT
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C65620-56LFXAT

• Lead Free Status / Rohs Status: Compliant

Introduction
EZ-USB HX2LP™ is Cypress’s next generation family of
high-performance, low-power USB 2.0 hub controllers. HX2LP is
an ultra low power single chip USB 2.0 hub controller with
integrated upstream and downstream transceivers, a USB serial
interface engine (SIE), USB hub control and repeater logic, and
TT logic. Cypress has also integrated many of the external
passive components, such as pull-up and pull-down resistors,
reducing the overall bill of materials required to implement a hub
design. The HX2LP portfolio consists of:
■
This device option is for ultra low-power applications that require
four downstream ports. All four ports share a single transaction
translator. The CY7C65630 is available in 56 QFN and is also
pin-for-pin compatible with the CY7C65640.
■
This device option is for a 2-port bus powered application. Both
ports share a single transaction translator. The CY7C65620 is
available in a 56 QFN.
All device options are supported by Cypress’s world class
reference design kits, which include board schematics, bill of
materials, Gerber files, Orcad files, and thorough design
documentation.
USB Serial Interface Engine
The
CY7C65620/CY7C65630 to communicate with the USB host.
The SIE handles the following USB activities independently of
the Hub Control Block.
■
■
■
■
Hub Repeater
The hub repeater manages the connectivity between upstream
and downstream facing ports that are operating at the same
speed. It supports full or low-speed connectivity and high-speed
connectivity. According to the USB 2.0 specification, the HUB
Repeater provides the following functions:
■
■
Document Number: 38-08037 Rev. *T
CY7C65630: 4-port/single transaction translator
CY7C65620: 2-port/single transaction translator
Bit stuffing and unstuffing
Checksum generation and checking
TOKEN type identification
Address checking.
Sets up and tears down connectivity on packet boundaries
Ensures orderly entry into and out of the suspend state,
including proper handling of remote wakeups.
serial
interface
engine
(SIE)
allows
the
Transaction Translator
The TT translates data from one speed to another. A TT takes
high speed split transactions and translates them to full- or
low-speed transactions when the hub is operating at high-speed
(the upstream port is connected to a high-speed host controller)
and has full or low speed devices attached. The operating speed
of a device attached on a downstream facing port determines
whether the routing logic connects a port to the TT or hub
repeater. If a full or low speed device is connected to the hub
operating at high speed, the data transfer route includes the TT.
If a high speed device is connected to this high speed hub, the
route only includes the repeater and no TT, because the device
and the hub are operating at the same speed. When the hub is
operating at full speed (the upstream port is connected to a full
speed host controller), a high speed peripheral does not operate
at its full capability. These devices only work at full speed. Full
and low speed devices connected to this hub operate at their
normal speed.
Applications
Typical applications for the HX2LP device family are:
■
■
■
■
■
■
■
■
Standalone hubs
Motherboard hubs
Monitor hubs
Advanced port replicators
Docking stations
Split-PC designs
External personal storage drives
Keyboard hubs
CY7C65620/CY7C65630
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