CD4055B

The CD4055B is singel-digit BCD-to-7-segment decoder/driver circuits that provide level-shifting functions on the chip.This feature permits the BCD input-signal swings (Vdd to Vss) to be the same as or different from the 7-segment output-signal swings (Vdd to Vee).For example,the BCD input-signal swings(Vdd to Vss)may be as small as 0 to -3V,where as the output-display drive-signal swing(Vdd to Vee)may be as large as from 0 to -15V.

Features of the CD4055B are:(1)operation of liquld crystals with CMOS circuits provides ultra-low-power displays; (2)equivalent ac output drive for liquid crystal displays-no external capacitor required; (3)voltage doubling across display,e.g. Vdd-Vee=18V results in effective 36V p-p drive across selected display segments; (4)low-or high-output level dc drive for other types of displays; (5)on-chip logic-level conversion for different input-and output-level swings; (6)full decoding of all input combinations:0-9,L,H,P,A,-,and blank positions; (7)100% tested for quiescent current at 20V; (8)maximum input current of 1A at 18V over full package temperature range;100nA at 18V and 25.

The absolute maximum ratings of the CD4055B can be summarized as:(1)CD4055B voltages referenced to Vss terminal:-0.5~20V; (2)input voltage range,all inputs:-0.5~Vdd+0.5V; (3)dc input current,any one input:±10mA; (4)power dissipation per package:500mW(forTa=-55~100);derate linearity at 12mW/ to 200mW(for Ta=100~125); (5)forTa=full package-temperature range:100mW; (6)operating-temperature range:-55~125; (7)storage temperature range:-65~150; (8)lead temperature :265.If you want to know more information such as the electrical characteristics, please download the datasheet in www.seekic.com or www.chinaicmart.com.