NEC MultiSync 75F-3 Service Manual page 82

1.0 CONNECTION DIAGRAM
(16 PINS PDIP 300 MIL PACKAGE)
2.0 PIN DESCRIPTIONS
Name I/O Pin#
VSSA - 1
VCO I/O 2
RP I/O 3
VDDA - 4
HFLB I 5
SSB I 6
SDA I 7
SCK I 8
VDD - 9
VFLB I 10
HTONE O 11
FBKG O 12
BOUT O 13
GOUT O 14
ROUT O 15
VSS - 16
VSSA 1
VCO 2
RP 3
VDDA 4
MTV016-N
HFLB 5
SSB 6
SDA 7
SCK 8
Analog ground. This ground pin is used to internal analog circuitry.
Voltage Control Oscillator. This pin is used to control the internal oscillator
frequency by DC voltage input from external low pass filter.
Bias Resistor. The bias resistor is used to regulate the appropriate bias
current for internal oscillator to resonate at specific dot frequency.
Analog power supply. Positive 5 V DC supply for internal analog circuitry.
And a 0.1uF decoupling capacitor should be connected across to VDDA and
VSSA.
Horizontal input. This pin is used to input the horizontal synchronizing
signal. It has an internal 100 k Ω pull-up resistor.
Serial interface enable. It is used to enable the serial data interface and is
also used to select I²C or SPI bus operation. If this pin is left floating, I²C bus
is enable. Otherwise the SPI bus is enabled.
Serial data input. The external data transfer through this pin to internal
display registers and control registers. It has an internal 100 k Ω pull-up
resistor.
Serial clock input. The clock input pin is used to synchronize the data
transfer. It has an internal 100 k Ω pull-up resistor.
Digital power supply. Positive 5 V DC supply for internal digital circuitry
and a 0.1uF decoupling capacitor should be connected across to VDD and
VSS.
Vertical input. This pin is used to input the vertical synchronizing signal. It
has an internal pull-up resistor.
Half tone output. This pin is used to attenuate the external R, G, B amplifiers
gain for the transparent windowing effect.
Fast Blanking output. It is used to cut off the external R, G, B signals while
this chip is displaying characters or windows.
Blue color output. It is a blue color video signal output.
Green color output. It is a green color video signal output.
Red color output. It is a red color video signal output.
Digital ground. This ground pin of internal digital circuitry.
16 VSS
15 ROUT
14 GOUT
13 BOUT
12 FBKG
11 HTONE
10 VFLB
9 VDD
Function
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