FS401LF ETC2 [List of Unclassifed Manufacturers], FS401LF Datasheet - Page 100
FS401LF
Manufacturer Part Number
FS401LF
Description
PC to TV Video Scan Converters
Manufacturer
ETC2 [List of Unclassifed Manufacturers]
Datasheet
1.FS401LF.pdf
(104 pages)
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FS401, FS403
For applications with more than one supply, combinations of the above two circuits can be used.
However, the simplest approach to this problem is to limit the loading on the SIO bus when possible.
When this is not possible, some of the SIO passive loads can be replaced with active ones. This will
increase the SIO access speed without increasing the SIO output low drive current.
In lightly loaded SIO busses (where V
on the SIO SDA line (Since the FS400’s input for SCL is 5 Volt tolerant, no additional parts are required
on that input). Pull-ups on both supply sides assure that the output on each device can reach its
corresponding upper limit. The pass gate (Q1) provides a low impedance connection during the low
switching voltage.
Q1 also provides isolation when the 3.3 Volt power to the FS400 is removed. The pass gate (Q1) gate to
source voltage is negative and the bulk diode is off. This effectively removes the FS400’s Serial Data line
from the SIO bus system and allows the higher voltage SIO section to operate normally.
JANUARY 24, 2007
OC Output
Figure 27. SIO (Open Collector) Translation using a MOSFET
+3.3V
FS400
OL
is easily reached), a single MOSFET can be used for translation
10K
R1
Q1 = BSS138
Q1
100
10K
R2
COPYRIGHT © 1999 FOCUS ENHANCEMENTS, INC.
5 Volt Device
OC Output
+5V
PRODUCT SPECIFICATION
REV. NO. 1.7
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