NE555N_NL Fairchild Semiconductor, NE555N_NL Datasheet - Page 10

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NE555N_NL

Manufacturer Part Number
NE555N_NL
Description
Manufacturer
Fairchild Semiconductor
Type
Standardr
Datasheet

Specifications of NE555N_NL

# Internal Timers
1
Power Dissipation
600mW
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (typ)
5/9/12/15V
Operating Supply Voltage (max)
16V
Package Type
PDIP
High Level Output Current
-200mA
Low Level Output Current
50mA
Pin Count
8
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Lead Free Status / RoHS Status
Compliant
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:

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