DLP-USB245R DLP Design Inc, DLP-USB245R Datasheet - Page 9

• Manufacturer Part Number: DLP-USB245R
• Description: MODULE USB-TO-PARL FIFO 18-DIP
• Manufacturer: DLP Design Inc

Specifications of DLP-USB245R

• Convert From (adapter End): USB
• Convert To (adapter End): Parallel
• Features: Bi-Directional
• Interface Type: USB
• Operating Supply Voltage: 3.3 V to 5.25 V
• Product: Interface Modules
• For Use With/related Products: Windows® 98 or higher, Mac OS 8.5 or higher
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 813-1025

Figure 2.
Figure 2 illustrates a typical USB self-powered configuration. A USB self-powered device gets
its power from its own power supply and does not draw current from the USB bus. Basic rules
for USB self-powered devices are as follows:
1. A self-powered device should not force current down the USB bus when the USB host or hub
controller is powered down.
2. A self-powered device can take as much current as it likes during normal operation and
during USB Suspend as it has its own power supply.
3. A self-powered device can be used with any USB host and both bus- and self-powered USB
hubs.
Figure 3.
Figure 3 shows how to configure the DLP-USB245R to interface with a 3.3V logic device. In this
example, the target electronics provide the 3.3 volts via the VCCIO line (Pin 7) which, in turn,
will cause the FT245R interface I/O pins to drive out at the 3.3V level.
Rev. 1.0 (November 2008)
3.3V
7
8
9
3.3V Logic Interface
5V System with
Bus-Powered
5.0V
8 Data Lines
Self-Powered
RXF#
TXE#
RD#
WR
5V System
7
8
9
9
3.3V
Microcontroller
© DLP Design, Inc.