MOTOROLA CMOS LOGIC DATA

5

MC14547B

CONNECTIONS TO VARIOUS DISPLAY READOUTS

LIGHT EMITTING DIODE (LED) READOUT

INCANDESCENT READOUT

LIGHT–EMITTING DIODE (LED) READOUT

USING A ZENER DIODE TO REPLACE DROPPING RESISTORS

* VZD should be set at VDD – 1.3 V – VLED. 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.

GAS DISCHARGE READOUT

FLUORESCENT READOUT

(Caution: Absolute maximum

working voltage = 18.0 V)

VDD

VSS

COMMON

CATHODE LED

≈ 1.7 V

VDD

VSS

COMMON

ANODE LED

≈ 1.7 V

VDD

VSS

VDD

VSS

COMMON

CATHODE LED

VDD

* *

VSS

VZD*

VDD

VSS

APPROPRIATE

VOLTAGE

VDD

VSS

DIRECT

(LOW BRIGHTNESS)

FILAMENT

SUPPLY

VSS OR APPROPRIATE

VOLTAGE BELOW VSS.