Low Power Logic Circuit

Oct 07, 2003 2 Replies
P

Hi Folks



I am trying design a NOT gate and two OR functions (Z= /A + B + C) but the only problem is the current consumption and the VCC. The current allowed for the logic is 5uA and the VCC is approx. 5V. I have tried looking for low powered ICs from Philips and Fairchild but the only problem is the maximum VCC is 3.3V and also it does not meet the current consumption. Is there a way of designing the logic using discretes without increasing the impedance of the circuit. I have used a transistor and two diodes but the resistor at the collector suggested by a colleague will have to be large to reduce the current consumption.



Any help will be great.



Thanks



Paul


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J

Are you living in a cave? ANY CMOS device will meet the power consumption easily. Their static consumption is zilch... just leakage.

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
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J

Are you living in a cave?^) Here's a single chip solution: U1 is an HC27 triple 3-input NOR and A,B, and C are the inputs and Y is the output of each gate. U1A _ +---A U1B U1C A>-------+---B Y--------A +---A _ +---C +----B Y----+---B Y--->/A+B+C | +--C +---C B>------------------+ | | C>--------------------+ _ U1A-Y = A __ U1B-Y = ABC _ U1C-Y = A+B+C
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