monta@cmu-cs-g.ARPA (Peter Monta) (08/16/85)
Are there ICs which convert +5V to +15V and -15V, at about 40mA each? This would be very convenient for providing RS-232 signal levels; often this is the only place such voltages are needed. (1488s require about 40mA at each voltage.) Failing a one-chip solution, what about a voltage quadrupler plus small 15V regulator (using a +5V to -5V converter for the -15V side)? Any suggestions, references, etc. about low-power DC-DC conversion welcome. Peter Monta monta@cmu-cs-g ..!rochester!cmu-cs-pt!cmu-cs-g!monta
mae@weitek.UUCP (Mike Ekberg) (08/23/85)
In article <301@cmu-cs-g.ARPA>, monta@cmu-cs-g.ARPA (Peter Monta) writes: > Are there ICs which convert +5V to +15V and -15V, at about 40mA each? > This would be very convenient for providing RS-232 signal levels; > often this is the only place such voltages are needed. (1488s require > about 40mA at each voltage.) ------ You might be interested in a new part from Motorola, it's the MC145406. It's a CMOS tranceiver that combines the functions of the 1488 and 1489. It contains 3 drivers and 3 receivers. It runs on +-5 V. And it uses 1/10 the power of the 1488. Price is $1.59 in 100-unit quantities(see _Electronic Design_, August 8,1985, pg. 149). Mike
ken@turtlevax.UUCP (Ken Turkowski) (08/23/85)
In article <301@cmu-cs-g.ARPA>, monta@cmu-cs-g.ARPA (Peter Monta) writes: > Are there ICs which convert +5V to +15V and -15V, at about 40mA each? > This would be very convenient for providing RS-232 signal levels; > often this is the only place such voltages are needed. (1488s require > about 40mA at each voltage.) ------ Intersil makes the ICL7660, which converts from +5V to -5V at 20mA. I think that you could run two in parallel for more oomph. -- Ken Turkowski @ CADLINC, Menlo Park, CA UUCP: {amd,decwrl,hplabs,seismo,spar}!turtlevax!ken ARPA: turtlevax!ken@DECWRL.ARPA
rbc@houxu.UUCP (R.CONNAGHAN) (08/27/85)
Power General makes a 24-pin module that converts +5V to +/- 12V at 40 mA each. About $35-40. -- Robert Connaghan WE 32100 Microprocessor Group AT&T Information System - Holmdel, N.J. houxu!rbc