CY7C68320C-100AXC Cypress Semiconductor Corp, CY7C68320C-100AXC Datasheet - Page 41

• Manufacturer Part Number: CY7C68320C-100AXC
• Description: IC USB 2.0 BRIDGE AT2LP 100LQFP
• Manufacturer: Cypress Semiconductor Corp
• Series: EZ-USB AT2LP™r
• Type: USB to ATA Bridger

Specifications of CY7C68320C-100AXC

• Package / Case: 100-LQFP
• Controller Type: USB 2.0 Controller
• Interface: I²C
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 50mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Operating Supply Voltage: 3.3 V
• Supply Current: 50 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: CY4615B - KIT USB TO ATA REFERENCE DESIGN
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 428-2267; CY7C68320C-100AXC

Figure 17
Figure 17. Plot of the Solder Mask (White Area)
Other Design Considerations
Certain design considerations must be followed to ensure proper
operation of the CY7C68300C/CY7C68301C. The following
items must be taken into account when designing a USB device
with the CY7C68300C/CY7C68301C.
Proper Power Up Sequence
Power must be applied to the CY7C68300C/CY7C68301C
before, or at the same time as the ATA/ATAPI device. If power is
supplied to the drive first, the CY7C68300C/CY7C68301C
startup in an undefined state. Designs that utilize separate power
supplies for the CY7C68300C/CY7C68301C and the ATA/ATAPI
device are not recommended.
Document 001-05809 Rev. *B
is a plot of solder mask pattern and
Figure 18
displays an X-Ray image of assembly (darker areas indicate solder).
Figure 18. X-Ray Image of the Assembly
IDE Removable Media Devices
The AT2LP does not fully support IDE removable media devices.
Changes in media state are not reported to the operating system
so users are unable to eject/reinsert media properly. This may
result in lost or corrupted data. Note that standard ATAPI optical
drives and ATA CompactFlash-type devices are not part of this
group.
Devices With Small Buffers
The size of the drive’s buffer can greatly affect the overall data
transfer performance. Care must be taken to ensure that drives
have large enough buffers to handle the flow of data to and from
it. The exact buffer size needed depends on a number of
variables, but a good rule of thumb is:
where ’other’ may include things such as the time required to
switch heads, power up a laser, etc. Drives with buffers that are
too small to handle the extra data may perform considerably
slower than expected.
(aprox min buffer) = (data rate) * (seek time + rotation time + other)
CY7C68300C, CY7C68301C
CY7C68320C, CY7C68321C
Page 41 of 42
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