大工数字电路课件第七章
VccR VCO TH
82 VCC 3
5 6R
+≥ - C=1+C
110R
1 V CC 3
-
1
Q Q RD
3 7DIS
+< - C=0 S=R=1, NC S≠R, Q=R
TR 2 R
-C+
2
011
S
T
1
4 RD
555定时器功能 VCO悬空不起作用
RD TH (6) TR (2)
R (C1) S (C2) Q (3) Q
T状态 (7)
1< 1 1 0
2 1 VCC< VCC 3 3 1 2< VCC> VCC 3 3 1 2> VCC> VCC 3 3
1 1 0
0 1 1
1
0
OFF (open)
1NC 0 NC 0 0 1 1 ON (GND)5 ON (GND)
Φ
Φ
ΦΦ