SA555D Fairchild Semiconductor, SA555D Datasheet - Page 9
SA555D
Manufacturer Part Number
SA555D
Description
IC TIMER SINGLE PREC 8-SOP
Manufacturer
Fairchild Semiconductor
Type
555 Type, Timer/Oscillator (Single)r
Datasheet
1.LM555CM.pdf
(14 pages)
Specifications of SA555D
Voltage - Supply
4.5 V ~ 16 V
Current - Supply
7.5mA
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (3.9mm Width)
Frequency
100kHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Count
-
Other names
SA555DFS
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6. Linear Ramp
6. Linear Ramp
When the pull-up resistor RA in the monostable circuit shown in Figure 1 is replaced with constant current source, the V
increases linearly, generating a linear ramp. Figure 13 shows the linear ramp generating circuit and Figure 14 illustrates the
generated linear ramp waveforms.
In Figure 13, current source is created by PNP transistor Q1 and resistor R1, R2, and R
For example, if Vcc=15V, R
V
Ic=(15-10.7)/20k=0.215mA
6. Linear Ramp
6. Linear Ramp
Figure 11. Circuit for Pulse Position Modulation
Figure 11. Circuit for Pulse Position Modulation
Figure 11. Circuit for Pulse Position Modulation
Figure 11. Circuit for Pulse Position Modulation
E
=0.7V+10V=10.7V
Output
Output
Output
Output
Output
V
Figure 13. Circuit for Linear Ramp
Figure 13. Circuit for Linear Ramp
Figure 13. Circuit for Linear Ramp
Figure 13. Circuit for Linear Ramp
E
=
I
C
V
3
2
2
3
BE
=
TRIG
OUT
OUT
TRIG
V
-------------------------- -
RESET
RESET
+
Here, V
4
CC
--------------------- - V
R 1
4
R
GND
R 2
E
–
+
1
GND
V
R 2
1
E
E is
Vcc
THRES
DISCH
8
CONT
E
CC
=20k , R1=5kW, R2=10k , and V
THRES
Vcc
DISCH
CONT
8
7
6
5
12
Modulation
Modulation
Modulation
Modulation
6
7
5
13
C C C C
C2
R R R R
R R R R
A A A A
B B B B
+Vcc
+Vcc
+Vcc
+Vcc
R
C1
E
Q1
+Vcc
R2
R1
Figure 12. Waveforms of pulse position modulation
Figure 12. Waveforms of pulse position modulation
Figure 12. Waveforms of pulse position modulation
Figure 12. Waveforms of pulse position modulation
BE
Figure 14. Waveforms of Linear Ramp
Figure 14. Waveforms of Linear Ramp
Figure 14. Waveforms of Linear Ramp
Figure 14. Waveforms of Linear Ramp
=0.7V,
E
.
LM555/NE555/SA555
C1
9 9 9 9