10 DTL Gates - ECE 110 M.-C. Brunet Reproduced from...

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ECE 110 M.-C. Brunet Diode Transistor Logic Gates Handout 10 M.-C. BRUNET ECE 110 UIUC 10.1 Diode Transistor Logic Reproduced from Datamation , November 1966 BJTs in logic circuits : BJT Vin Vout Vout Vin Vin Vout Transistor is L H Gate : The BJT should never operate in the active region. Logic symbol : M.-C. BRUNET ECE 110 UIUC 10.2 i B Vin V CC Vout + - i B Vin V CC Vout + - V CC Vout + - i B Vin This is a one-input DTL gate (input:Vin) Assume Von = V BEON = 0.7v For Vin > . . . T is ON (& diode is ON!) Assume i B is large enough to saturate T (check value after!) J Vout V CESAT Vin = H J Vout = L ~ ~ For Vin < . . . T is OFF (& diode is OFF!) J Vout V CC Vin = L J Vout = H ~ ~ SAT L H OFF H L Diode T Vout Vin L R NOT Gate
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ECE 110 M.-C. Brunet Diode Transistor Logic Gates Handout 10 M.-C. BRUNET ECE 110 UIUC 10.3 Assume Von = V BEON = 0.7V, V CC = 5V, V CESAT = 0.2V 1) When T is OFF, can the diode be ON (the current would go trough the bottom resistor)? T is OFF for Vin Low : take 0V. If diode is ON, v across = 0.7V, and a positive current iD flows through. + - 0 5V 0.7V iD > 0 Anything wrong ? X ( T is O F ) I Vin = 0V R ON SAT L H OFF OFF H L Diode T Vout Vin Checking the truth table for the last circuit 1) M.-C. BRUNET ECE 110 UIUC 10.4 2) When T is saturated, assume the Diode is ON, and check that everything is OK (makes sense).
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This note was uploaded on 09/16/2009 for the course ECE 110 taught by Professor Haken during the Spring '08 term at University of Illinois at Urbana–Champaign.

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10 DTL Gates - ECE 110 M.-C. Brunet Reproduced from...

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