NE556 Datasheet, PDF (5/8 Pages) NXP Semiconductors – Dual timer

Figure 7 : High Output Voltage Drop versus
Output
Figure 8 : Delay Time versus Supply Voltage
NE556-SA556-SE556
TYPICAL APPLICATION
50% DUTY CYCLE OSCILLATOR
V_CC
Output
RA
4
(10)
6 (8)
51k^W
14
R_s
(13) ₁
1/2
22k^W
NE556
SE556
(12) 2
5 (9)
(11) 3
0.01nF
7
C
t₁ = 0.693 R_A.C
t2 = [(RARB)/(RA+RB)]CLn
f = _t---1---^t-+-1----_t--2-- R B < ^12-- RA ti
R_2----R-B_----B--–_----–2----RR_-----AA_--
t2
Figure 9 : Propagation Delay versus Voltage
Level of Trigger Value
t1
PULSE WIDTH MODULATOR
V_CC
Trigger
Output
4
(10)
6 (8)
14
(13) ₁
1/2
NE556
SE556
(12) 2
5 (9)
(11) 3
7
MODULATION
INPUT
RA
C
5/8