LM555CN Fairchild Semiconductor, LM555CN Datasheet - Page 10
LM555CN
Manufacturer Part Number
LM555CN
Description
IC TIMER SINGLE 0-70DEG C 8-DIP
Manufacturer
Fairchild Semiconductor
Type
555 Type, Timer/Oscillator (Single)r
Datasheet
1.LM555CM.pdf
(14 pages)
Specifications of LM555CN
Voltage - Supply
4.5 V ~ 16 V
Current - Supply
7.5mA
Operating Temperature
0°C ~ 70°C
Package / Case
8-DIP (0.300", 7.62mm)
Frequency
100kHz
Number Of Internal Timers
1
Supply Voltage (max)
16 V
Supply Voltage (min)
4.5 V
Maximum Power Dissipation
600 mW
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
Through Hole
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Count
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
LM555CNFS
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM555CN
Manufacturer:
Fairchild Semiconductor
Quantity:
30 401
Part Number:
LM555CN
Manufacturer:
NS/国半
Quantity:
20 000
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: