NE555D STMicroelectronics, NE555D Datasheet - Page 13

• Manufacturer Part Number: NE555D
• Description: IC TIMER SINGLE BIPOLAR 8-SOIC
• Manufacturer: STMicroelectronics
• Type: 555 Type, Timer/Oscillator (Single)r

Specifications of NE555D

• Frequency: 500kHz
• Voltage - Supply: 4.5 V ~ 16 V
• Current - Supply: 10mA
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-SOIC (3.9mm Width)
• 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: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Count: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-1962-5; 497-2990-5; 497-2990-5

NE555 - SA555 - SE555
4.5
Figure 20
The time interval is given by:
Figure 20. Linear ramp
50% duty cycle oscillator
For a 50% duty cycle, the resistors R
period for the output high is the same as for astable operation (see
For the output low it is
Thus the frequency of oscillation is:
t1 = 0.693 R
shows the waveforms generator by the linear ramp.
A
C
V
Time:
20 µs/DIV
R
R
R
C = 0.01 µF
t
2
CC
1
2
E
T =
=
= 100 kΩ
+ 47 kΩ
= 2.7 kΩ
= 5 V
[(R. RB)/(RA+RB)].C.Ln
--------------------------------------------------------------- - VBE = 0.6V
R1 Vcc - VBE (R1+R2)
(2/3 Vcc RE (R1+R2) C
A
and R
Top trace: input 3 V/DIV
Middle trace: output 5 V/DIV
Bottom trace: output 5 V/DIV
Bottom trace: capacitor voltage 1 V/DIV
f
=
B
---------------- -
t1
can be connected as in
1
+
t2
RB 2RA
-------------------------- -
2RB RA
–
–
Application information
Section 4.2 on page
Figure
21. The time
13/20
9):