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Measurement of
Input/Output current
for IC TTL 7400
circuit
GND
Ｉ 2
NAND2
inst1
GND
NAND2
Ｉ 3
inst2
NAND2
GND
2
V0
Ｉ 4
inst3
NAND2
GND
GND
inst
Ｉ 1
Ｉ 5
inst4
NAND2
GND
1
Ｉ 0
Ｉ 6
inst5
NAND2
GND
INPUT
VCC
Ｉ 7
inst6
NAND2
GND
NAND2
Vcc
inst7
Measure current by portable digital multimeter
Made the table for both input cases “1”
and “2”

n Vo
1
2
3
4
5
6
7
Io
Ii1+Ii2+……+Iin
Note


The current meter should cascade with the
branch or element which is measured.
You can extend the number of the gates that
output of the gate in previous level connect
such that the output voltage level becomes
false. Then, you can find the fan-out of the
gate.
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