HW: Show the wired-AND circuit for a 10-input AND function using 74LS09 quad 2 input AND gates.

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Example 3-5: Three open-collector AND gates are connected in a wired-AND configuration as shown in Fig. 3-27.
Assume that the wired-AND circuit is driving four standard TTL inputs (-1.6 mA each).
(a) Write the logic expression for X.
(b) Determine the minimum value of Rp if IOL(max) for each gate is 30 mA and VOL(max) is 0.4 V.
+5 V
Solution: (a) X=ABCDEF
(b) Total current= 4(1.6 mA)=6.4 mA
IRp= IOL(max)-6.4-30-6.4-23.6 mA
Rp Vcc-VOL(mxa)//Rp 5-0.4/23.4mA=195 Ohm
A
B
C
HW: Show the wired-AND circuit for a 10-input AND function using
74LS09 quad 2 input AND gates.
D
E
F
K
A
Rp
ox
Fig. 3-27.
Transcribed Image Text:Example 3-5: Three open-collector AND gates are connected in a wired-AND configuration as shown in Fig. 3-27. Assume that the wired-AND circuit is driving four standard TTL inputs (-1.6 mA each). (a) Write the logic expression for X. (b) Determine the minimum value of Rp if IOL(max) for each gate is 30 mA and VOL(max) is 0.4 V. +5 V Solution: (a) X=ABCDEF (b) Total current= 4(1.6 mA)=6.4 mA IRp= IOL(max)-6.4-30-6.4-23.6 mA Rp Vcc-VOL(mxa)//Rp 5-0.4/23.4mA=195 Ohm A B C HW: Show the wired-AND circuit for a 10-input AND function using 74LS09 quad 2 input AND gates. D E F K A Rp ox Fig. 3-27.
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