ViewSonic VG181 - Page 33

ViewSonic Service Manual
July 2000 - Version 1.0 VG181
THEORY OF CIRCUIT OPERATION
Power Management Pin Description
| Power Down ( (active “low). A “high. level (3.3V) indicates
normal operation and a low level indicates power down
mode. During power down mode, all output buffers are
disabled and brought low, all analog logic is powered
down, and all inputs are disabled.
Impedance Matching Control. Resistor value should be ten
times the characteristic impedance of the cable. In the
common case of 50 transmission line, an external 500
resistor must be connected between AVCC and this pin.
Reserved Pin Description
_PinName | PinNo.| Type | Description
RESERVED | 99 | In | Must be. tied tied high for for normal op operation.
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