Re: really simple RS232-TTL converter... does it work?
- From: "Dan Lenski" <dlenski@xxxxxxxxx>
- Date: 19 Jan 2007 21:25:23 -0800
miso@xxxxxxxxx wrote:
Actually, the other circuit is closer to what was used. Just going to
the inverter gate with a resistor would cause the impedance to be very
high as the input went between ground and the positive supply rail.
Isn't the input impedance of a CMOS gate *supposed* to be extremely
high?
The divider in the Maxim designs was needed to keep the gate voltage
within limits.
Doesn't this simple voltage divider increase the quiescent current
drawn by the device significantly? Is that why the shutdown mode is
included?
.
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