CY7C65640A-LFC Cypress Semiconductor Corp, CY7C65640A-LFC Datasheet - Page 3

• Manufacturer Part Number: CY7C65640A-LFC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C65640A-LFC

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.15V
• Operating Supply Voltage (max): 3.45V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 56
• Lead Free Status / RoHS Status: Not Compliant

Introduction
Cypress’s TetraHub™ is a high performance self powered
Universal Serial Bus (USB) 2.0 hub. The Tetra architecture
provides four downstream USB ports, with a Transaction Trans-
lator (TT) for each port, making it the highest performing hub
possible. This single-chip device incorporates one upstream and
four downstream USB transceivers, a serial Interface Engine
(SIE), USB hub controller and repeater, and four TTs. It is
suitable for standalone hubs, motherboard hubs, and monitor
hub applications.
Being a fixed-function USB device, there is no risk or added
engineering effort required for firmware development. The
developer does not need to write any firmware for their design.
The CY4602 Tetrahub USB 2.0 4-port Hub Reference Design Kit
provides all materials and documents needed to move rapidly
into production. The reference design kit includes board
schematics, bill of materials, Gerber files, Orcad files, key appli-
cation notes, and product description.
CY7C65640A-LFXC is a functional and pin equivalent die
revision of Cypress's CY7C65640-LFXC. Changes were made
to improve device performance.
TetraHub Architecture
The
tecture.
USB Serial Interface Engine (SIE)
The SIE enables the CY7C65640A to communicate with the
USB host through the USB repeater component of the hub. The
SIE handles the following USB bus activity independently of the
Hub Control Block:
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Hub Controller
The hub control block does the following protocol handling at a
higher level:
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The Hub controller provides status and control and permits host
access to the hub.
Document #: 38-08019 Rev. *M
Bit stuffing/unstuffing
Checksum generation/checking
ACK/NAK/STALL
TOKEN type identification
Address checking.
Coordinate enumeration by responding to SETUP packets
Fill and empty the FIFOs
Suspend/Resume coordination
Verify and select DATA toggle values
Port power control and overcurrent detection.
Logic Block Diagram
on page 1 shows the TetraHub Archi-
Hub Repeater
The hub repeater manages the connectivity between upstream
and downstream facing ports that are operating at the same
speed. It supports full/low speed connectivity and high speed
connectivity. According to USB 2.0 specification, the hub
repeater provides the following functions:
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Transaction Translator
The TT translates data from one speed to another. A TT takes
high speed split transactions and translates them to full/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/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 transaction trans-
lator or hub repeater section. If a low or full speed device is
connected to the hub operating at high speed, the data transfer
route includes the transaction translator. If a high speed device
is connected to this high speed hub the route only includes the
repeater and no transaction translator; the device and the hub
are in conformation with respect to their data transfer 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 1.1 speed. Full and low speed devices connected to
this hub operate at their 1.1 speed.
Applications
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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.
Standalone Hubs
Motherboard Hubs
Monitor Hub applications
External Personal Storage Drives
Port Replicators
Portable Drive
Docking Stations
CY7C65640A
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