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LM1270NA データシート(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1270NA
部品情報  Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1270NA データシート(HTML) 6 Page - National Semiconductor (TI)

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Pin Descriptions (Continued)
Pin
No.
Pin Name
Schematic
Description
12
H Sync
Logic level horizontal sync signal received from the
video card in the PC or sync stripper circuit.
13
SCL
The I
2C compatible Clock line. A pull-up resistor of
about 2 k
Ω should be connected between this pin
and V
CC. A 100
Ω resistor should be connected in
series with the clock line for additional ESD
protection.
14
SDA
The I
2C compatible data line. A pull-up resistor of
about 2 k
Ω should be connected between this pin
and V
CC. A 100
Ω resistor should be connected in
series with the data line for additional ESD
protection.
15
Blank/Interrupt
Out
This output pin can be selected for Vertical Blank,
blank all the video, or no blanking. Provides the
blanking signal normally used at G1 of the CRT,
blanking the video during vertical retrace. If blanking
is not required, this pin may be used as an interrupt
signal for the microcontroller.
16
H Flyback
Proper operation requires current reversal. R
H
should be large enough to limit the peak current at
pin 16 to about +2 mA during blanking, and
−300 µA during scan. C
17 is usually needed for logic
level inputs and should be large enough to make
the time constant, R
HC17 significantly larger than the
horizontal period. R
Fil and CFil are typically 300
and 330 pF when the flyback waveform has ringing
and needs filtering. These two parts are not used on
the current neck board. C
57 may be needed to filter
extraneous noise and can be up to 100 pF.
www.national.com
6


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