2.65Volts CMOS interface.

  • Thread starter David Joseph Bonnici
  • Start date
D

David Joseph Bonnici

Guest
Hi, I need suggestions on what logic level translators IC's to use to
interface 2.65Volts CMOS.

I have the following constraints on the 2.65Volts CMOS side.

Rout is approx 1kΩ
For logic 0-> Vout,max = 0.2V @ I = 0.1mA
For logic 1-> Vout,min = 2.25V @ I = -0.1mA
-> Vout max = 2.76V

As you can see there is not much where to play. Only 0.11Volts up and
0.4Volts down. This thing is getting me crazy. I need the system to be
robust, and also transfer rates of 115,000 baud.

There are some IC's around that are specifically for low voltage
interfacing but the output voltage is quite dependent on the current
sunk. The voltage drop is in the order of several hundred milli volts.

Any ideas and suggestions. Preferably the IC's used are in DIP package
format.

David Joseph Bonnici
 
I take it your using something other then 3.3v CMOS digital logic.

A few pages on the digital logic page may help:
http://www.interfacebus.com/Logic_Design_Descriptions.html


"David Joseph Bonnici" <djb@global.net.mt> wrote in message
news:52e74f9f.0410010030.5293ce78@posting.google.com...
Hi, I need suggestions on what logic level translators IC's to use to
interface 2.65Volts CMOS.

I have the following constraints on the 2.65Volts CMOS side.

Rout is approx 1kΩ
For logic 0-> Vout,max = 0.2V @ I = 0.1mA
For logic 1-> Vout,min = 2.25V @ I = -0.1mA
-> Vout max = 2.76V

As you can see there is not much where to play. Only 0.11Volts up and
0.4Volts down. This thing is getting me crazy. I need the system to be
robust, and also transfer rates of 115,000 baud.

There are some IC's around that are specifically for low voltage
interfacing but the output voltage is quite dependent on the current
sunk. The voltage drop is in the order of several hundred milli volts.

Any ideas and suggestions. Preferably the IC's used are in DIP package
format.

David Joseph Bonnici
Click to expand...
 
I might have not understood, what you are saying. I am constrained to
use such a family.

David Joseph Bonnici
 
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