NE555N STMicroelectronics, NE555N Datasheet - Page 6

• Manufacturer Part Number: NE555N
• Description: IC TIMER SINGLE BIPOLAR 8 DIP
• Manufacturer: STMicroelectronics
• Type: 555 Type, Timer/Oscillator (Single)r

Specifications of NE555N

• Frequency: 500kHz
• Voltage - Supply: 4.5 V ~ 16 V
• Current - Supply: 10mA
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Number Of Internal Timers: 1
• Supply Voltage (max): 16 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: Through Hole
• Current, Supply: 3 mA (Typ.)
• Number Of Pins: 8
• Package Type: DIP
• Temperature, Operating: 0 °C
• Temperature, Storage: -65 to +150 °C
• Time, Fall, Output: 100 ns (Typ.)
• Time, Rise, Output: 100 ns (Typ.)
• Voltage, Control: 10 V (Typ.)
• Voltage, Output, High Level: 12.5 V (Typ.) @ 200 mA
• Voltage, Output, Low Level: 2.5 V (Typ.) @ 200 mA
• Voltage, Supply: 4.5 to 16 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Count: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-1963-5

Figure 11 :
Figure 12 :
ASTABLE OPERATION
When the circuit is connected as shown in figure
13 (pin 2 and 6 connected) it triggers itself and
free runs as a multi vibrator. The external capaci-
tor charges through R
through R
cisely set by the ratio of these two resistors.
In the astable mode of operation, C
discharges between 1/3 V
the triggered mode, the charge and discharge
times and therefore frequency are independent of
the supply voltage.
Figure 13 :
NE555-SA555-SE555
6/9
0.001
( F)
0.01
0.1
1.0
10
C
10
t = 0.1 ms / div
s
OUTPUT VOLTAGE = 5.0V/div
V
0.01 F
INPUT = 2.0V/div
CAPACITOR VOLTAGE = 2.0V/div
R1 = 9.1k , C1 = 0.01 F, R = 1k
CC
2
Output
= 5 to 15V
only. Thus the duty cycle may be pre-
100
Voltage
Control
s
3
5
1.0
ms
1
4
NE555
1
ms
10
and R
CC
8
L
2
100
ms
and 2/3 V
7
6
2
and discharges
10
1
s
charges and
R1
R2
C1
(t )
CC
d
. As in
Figure 14 shows actual waveforms generated in
this mode of operation.
The charge time (output HIGH) is given by:
t1 = 0.693 (R
and the discharge time (output LOW) by:
t2 = 0.693 (R
Thus the total period T is given by:
T = t1 + t2 = 0.693 (R1 + 2R2) C1
The frequency of oscillation is then:
The duty cycle is given by:
Figure 14 :
Figure 15 : Free Running Frequency versus R
may be easily found by figure 15.
0.001
( F)
0.01
0.1
1.0
10
C
0.1
R1 = R2 = 4.8k , C1= 0.1 F, R = 1k
R
CAPACITOR VOLTAGE = 1.0V/div
t = 0.5 ms / div
OUTPUT VOLTAGE = 5.0V/div
2
1
2
and C
f =
) C
1
+ R
1
-- -
T
1
D
2
10
) C
1
=
=
1
--------------------------------------- -
R 1
------------------------- -
R 1
100
R 2
+
+
1.44
2 R 2
2 R 2
1k
C 1
10k
L
f (Hz)
o
1
,