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Model 5340A
Theory of Operation
4-23. Four-Line to Ten-Line Decoder 1820-021 4
4-24. The 1820-0214 decoder (Figure 4-9) consists of eight inverters and 10 four-input NAND
gates. As shown in the truth table, the unit accepts BCD inputs and provides the equivalent
decimal output. The activiated output will be a logic low. For example, if the BCD input is
DCBA = 0111, then the decimal 7 output will go low and all others will be high.
Figure 4-9. Four-Line to Ten-Line Decoder 1820-0214
INPUTS
0
OUTPUTS
1820-0214
FOUR-LINE
( P O S I T I V E
4-25. Operational Amplifier 1820-0216
4-26. Figure 4-10 shows the diagram for the operational amplifier. Operational amplifiers are
so named because they perform a mathematical operation in a circuit. The type of operation is
determined by the feedback network. I n the 5340A, this IC is used in a dc stabilizing feedback
network on A17.
Figure 4-10. Operational Amplifier 1820-0216
4-27. Monostable Multiviprator 1820-0261
4-27. This multivibrator (Fi$uie 4-11) is stable in one state only; i.e., when not triggered,
low and Q is high. Triggerink is dc from either positive or negative-going inputs and is not
directly related to the transidion time of the input pulse.
logic inputs and will trigger the one-shot when either or both go low provided that B is high.
the positive Schmitt trigger input that triggers the one-sh$ when
A2 low. When the monostable triggers,
4-8
OUTPUTS
BCD INPUT
'9
3
4
5
TO
TEN-LINE DECODER
LOGIC)
.
NOTE: Pin 4 connected to case
Q
goes high and Q goes low for a period determined by
TRUTH
TABLE
DECIMAL OUTPUT
and A2 are negative-edge-triggered
B goes high with either A1 or
Q
is
B
is
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Troubleshooting
