Post by thread:[EE]: High current output decade counters?

Hello, does anyone knows if there is a decade counter (TTL) that can sink or source higher current than the 4017? I need about 50mA on the output, sinking or sourcing. Thanks, Brusque ----------------------------------- Edson Brusque Research and Development C.I.Tronics Lighting Designers Ltda (47) 323-2138 / (47) 9993-6453 Blumenau - SC - Brazil http://www.citronics.com.br ----------------------------------- -- http://www.piclist.com hint: To leave the PICList spam_OUTpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu

Edson Brusque wrote: > > Hello, > > does anyone knows if there is a decade counter (TTL) that can sink or > source higher current than the 4017? I need about 50mA on the output, > sinking or sourcing. Hi, no that figure is way outside TTL or CMOS gate spec. Normally people use a buffer IC, like a ULN2003/ULN2008, that has 7 or 8 darlington transistors inside a 14 pin or 16 pin chip. Search the net for lots of info and sources of these chips. Other than that, maybe if you posted more about what you are making we could help you better? :o) -Roman -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

On Mon, Jul 16, 2001 at 11:22:47PM +1000, Roman Black wrote: > Edson Brusque wrote: > > > > Hello, > > > > does anyone knows if there is a decade counter (TTL) that can sink or > > source higher current than the 4017? I need about 50mA on the output, > > sinking or sourcing. > > > Hi, no that figure is way outside TTL or CMOS > gate spec. Not exactly. One part I use for this purpose is the 7445 BCD decoder which can sink 80ma. However it's not a counter. So you'd have to provide it with the 4 bit code of which line to sink. I use them for LED displays. BAJ -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads