Motorola CMOS Logic Manual page 435

V DD
V SS
INCANDESCENT READOUT
V DD
V SS
GAS DISCHARGE READOUT
V DD
V SS
* V ZD should be set at V DD – 1.3 V – V LED . Wattage of zener diode
must be calculated for number of segments and worst–case
conditions.
** A filament pre–warm resistor is recommended to reduce filament
thermal shock and increase the effective cold resistance of the
filament.
MOTOROLA CMOS LOGIC DATA
CONNECTIONS TO VARIOUS DISPLAY READOUTS
LIGHT EMITTING DIODE (LED) READOUT
COMMON
CATHODE LED
1.7 V
USING A ZENER DIODE TO REPLACE DROPPING RESISTORS
V DD
* *
APPROPRIATE
VOLTAGE
V DD
COMMON
ANODE LED
V SS
LIGHT–EMITTING DIODE (LED) READOUT
V DD
V SS
FLUORESCENT READOUT
V DD
DIRECT
(LOW BRIGHTNESS)
V SS
(Caution: Absolute maximum
working voltage = 18.0 V)
1.7 V
COMMON
CATHODE LED
V ZD *
V SS
FILAMENT
SUPPLY
V SS OR APPROPRIATE
VOLTAGE BELOW V SS .
MC14547B
6–397