to 7-Segment Decoder-Driver (Low = on, 40mA, 30-Volt Outputs)
|This package accepts a 1-2-4-8
positive-logic Binary Coded Decimal (BCD) input and converts it to the
proper pattern necessary to illuminate a 7 segment display. A low
output is intended to light the segment. (Common anode).
The outputs can sink 40milliamperes (mA) in the low state and can
withstand 30 volts in the high state. The supply voltage must remain at
5+ volts. An output-high state can be obtained only if a display device
or resistor pulls the output to some positive voltage less than 30
Current-liminting resistors, typically 330 ohms, must be used when
driving a light emitting diode display with this package. Incandescent
or fluorescent readouts can be driven directly.
The Lam test input should remain high when not in use. To enable the
lamp test feature, momentarily bring the Lamp Test input to ground,
this will illuminate all of the segment outputs (for testing). A low on
the blanking input will extinguish character "0". A low on the Blanking
output is provided to extinguish the character "0" of the next stage if
leading-edge blanking is desired.
A low on the Blanking output will extinguish the display.
Propagation delay =
Current per Package
= 43 milliamperes (mA)