ESTEK NE555

NE555
Description
These devices are monolithic timing circuits capable of producing accurate time delays or oscillation.
Inthe time delay mode of operation, the timed interval is controll ed by a single external resistor and capacit
or netw ork. In the astable mode of operation, the frequency and duty cy cle may be independently
controlled wi th two external resistors and a si ngle external capacitor.
Features
•
Timing from Microseconds to Hours
•
Astable or Monostable Operation
•
Adjustable Duty Cycle
•
TTL - Compatible Output Can Sink or Source Up to 200 mA
•
Temperature Stability
DIP-8
of 0.005% per o C
SOP-8
• Direct Replacement for Signetics NE555 Timer
P ack age
Applications
Pin Configuration
•
Precision timing
•
Pulse generation
•
Sequential timing
•
Time delay generation
•
•
Pulse w idth modulation
Pulse position modulation
•
Missing pulse detector
TOP VIEW
Internal Block Digram
RESET can override TRIGGER, which can override
THRESHOLD
BEIJING ESTEK ELECTRONICS CO.,LTD
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NE555
Absolute Maximum Ratings
(TA=25°C, unless otherwise specified)
Parameter
Supply Voltage, VCC
Input Voltage (control, reset, threshold and trigger)
Output Current, I0
Operating Free-Air Temperature, TA
Storage Temperature Range, TSTG
Min
Max
Units
4.5
16
VCC
±200
70
+150
V
-65
mA
°C
Electrical characteristics
(TA=25°C, VCC=+5V to +15V, unless otherwise specified)
Parameter
Operating Supply Voltage Range
Threshold Voltage Level
Test conditions (Note 2)
VCC=15V
VCC=5V
(see Note 1)
VCC=15V
VCC=5V
Trigger at 0V
Threshold Current (Note 1)
Trigger Voltage Level
Trigger Current
Reset Voltage Level
Reset Current
4.5
1.1
0.3
Reset at VCC
Reset at 0V
Discharge Leakage Current
Control Voltage Level
VCC=15V
VCC=5V
VCC=15V
Low-level Output Voltage
9
2.6
IOL=10mA
IOL=50mA
IOL=100mA
IOL=200mA
IOL=5mA
IOL=8mA
IOL=-100mA
IOL=-200mA
IOL=-100mA
VCC=15V
VCC=5V
VCC=15V
VCC=5V
VCC=5V
High-level Output Voltage
VCC=15V
Supply Current
Initial Error of
Timing Interval (Note 3)
Min
4.5
8.8
2.4
monostable
(Note 4)
astable
(Note 5)
monostable
astable
monostable
astable
VCC=5V
Output Low,
No Load
Output High,
No Load
TA=25°C
12.75
2.75
Typ
10
3.3
30
5
1.67
0.5
0.7
0.1
-0.4
20
10
3.3
0.1
0.4
2
2.5
0.25
0.3
13.3
12.5
3.3
10
3
9
2
1
5
Max
16
11.2
4.2
250
5.6
2.2
2
1
0.4
-1.5
100
11
4
0.25
0.75
2.5
Units
V
V
nA
V
µA
V
mA
nA
V
0.35
0.4
15
6
13
5
3
mA
%
13
Temperature Coefficient
TA=MIN to MAX
50
150
ppm /°C
of Timing Interval
150
500
TA=25°C
Supply Voltage Sensitivity of
0.1
0.5
%/V
Timing Interval
0.3
1
CL=15pF, TA=25°C
Output Pulse Rise Time
100
300
ns
Output Pulse Fall Time
100
300
Note 1: This parameter influences the maximum value of the timing resistors RA and RB in the circuit on Fig 1. For example, when
VCC=5V, the maximum value is R=R A+RB=3.4 MΩ, and VCC=15V, the maximum value is 10 MΩ.
Note 2: For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
Note 3: Timing interval error is defined as the difference between the measured value and the average value of a random sample from
each process run.
Note 4: Values specified are for a device in a monostable circuit similar to Fig. 2, with component values as follow: RA=2KΩ to 100 KΩ,
C=0.1µF.
Note 5: Values specified are for a device in an astable circuit similar to Fig. 1, with component values as follow: RA, RB=1KΩ to 100 KΩ,
C=0.1µF.
BEIJING ESTEK ELECTRONICS CO.,LTD
2
NE555
Function Table
Reset
Trigger Voltage *
Threshold Voltage *
Output
Low
High
High
High
Irrelevant
< 1/3 VCC
> 1/3 VCC
> 1/3 VCC
Irrelevant
High
> 2/3 VCC
< 2/3 VCC
Low
High
Low
Discharge Switch
On
Off
On
As previously established
* Voltage levels shown are nominal
Typical Applications Circuit
Figure 2. Circuit for monostable operation
Figure 1 Circuit for astable operation
NOTE A: Bypassing the control voltage input to ground with a capacitor may improve operation. This should
applications.
be evaluated
for individual
Ordering Information
O RDERING NUM BER
P ACK AG E
M ARKIN G
NE555
DIP - 8 / SOP - 8
NE555
Address :
6A06--6A07
Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing
Postalcode:100039
Tel: 86-010-58895780 / 81 / 82 / 83 / 84
Fax : 010-58895793
Http://www.estek.com.cn
Email:sales@estek.com.cn
REV No:01-060823
BEIJING ESTEK ELECTRONICS CO.,LTD
3