LM1236 National Semiconductor Corporation, LM1236 Datasheet - Page 13

• Manufacturer Part Number: LM1236
• Description: 150 Mhz I2c Compatible Rgb Preamplifier With Internal 254 Character Osd Rom, 512 Character Ram And 4 Dacs
• Manufacturer: National Semiconductor Corporation

Pin
No.
23
24
Pin Descriptions and Application Information
Pin Name
H Flyback
CLAMP
Schematic
13
(Continued)
This pin accepts either TTL or CMOS logic
levels. The internal switching threshold is
approximately one-half of V
series resistor, R
to avoid overdriving the input devices. In any
event, R
voltage at pin 23 from going higher than V
below GND.
Proper operation requires current reversal. R
should be large enough to limit the peak current
at pin 24 to about +4 ma during blanking, and
−500 µA during scan. C
logic level inputs and should be large enough to
make the time constant, R
larger than the horizontal period. R
typically 300Ω and 330 pF when the flyback
waveform has ringing and needs filtering. C
may be needed to filter extraneous noise and
can be up to 100 pF.
EXT
must be large enough to prevent the
31
Description
, of about 1K is recommended
17
H
is usually needed for
CC
C
17
. An external
significantly
34
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and C
CC
18
8
H
are
or