SA555D Fairchild Semiconductor, SA555D Datasheet - Page 10
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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LM555/NE555/SA555
When the trigger starts in a timer configured as shown in Figure 13, the current flowing through capacitor C1 becomes a
constant current generated by PNP transistor and resistors.
Hence, the V
follows:
Here the Vp-p is the peak-to-peak voltage.
If the electric charge amount accumulated in the capacitor is divided by the capacitance, the V
V=Q/C
The above equation divided on both sides by T gives us
and may be simplified into the following equation.
S=I/C
In other words, the gradient of the linear ramp function appearing across the capacitor can be obtained by using the constant
current flowing through the capacitor.
If the constant current flow through the capacitor is 0.215mA and the capacitance is 0.02 F, the gradient of the ramp function
at both ends of the capacitor is S = 0.215m/0.022 = 9.77V/ms.
10
10
10
10
S
V
--- -
T
=
=
V p p
----------------
Q T
----------- -
T
–
C
C
is a linear ramp function as shown in Figure 14. The gradient S of the linear ramp function is defined as
14
(15)
(17)
16
C
comes out as follows: