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From: jgb@prism.gatech.EDU (James G. Baker)
Newsgroups: sci.electronics
Subject: PROM voltages
Message-ID: <17095@hydra.gatech.EDU>
Date: 14 Nov 90 20:16:33 GMT
Organization: Georgia Institute of Technology
Lines: 21

I was hoping to make a PROM programmer.  Of course, the reading of this
27C256 is no problem, programming it is much different from TTL.  If I wish
to have the programming voltage (13 volts) and the Vcc=6.5 under software
control, could I use a Digital-to-Analog converter and some bodacious OpAmp
circuit to do this?

Here are the specs:
      Signal         	READ		PROGRAM
      Vcc		+5.0		+6.5	
      Vpp		+5.0		+13.5	(30mA)

Can I skimp at all with these voltages specs?  I am using a PC interface with
Gnd, +5, -5, +12, and -12.  Any help would be most appreciated.

Respond via e-mail to jgb@prism.gatech.edu
Thanks!
-- 
BAKER,JAMES G - Lab Technician, School of Electrical Engineering
Georgia Institute of Technology, Atlanta Georgia, 30332
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