LM555I Datasheet PDF - Fairchild Semiconductor


www.Datasheet-PDF.com

LM555I
Fairchild Semiconductor

Part Number LM555I
Description SINGLE TIMER
Page 6 Pages

LM555I datasheet pdf
View PDF for PC
LM555I pdf
View PDF for Mobile


No Preview Available !

LM555/I
SINGLE TIMER
SINGLE TIMER
The LM555/I is a highly stable controller capable of producing accurate
timing pulses. With monostable operation, the time delay is controlled
by one external and one capacitor. With astable operation, the frequency
and duty cycle are accurately controlled with two external resistors and
one capacitor.
8 DIP
FEATURES
High Current Drive Capability (= 200mA)
Adjustable Duty Cycle
Temperature Stability of 0.005%/°C
Timing From µSec To Hours
Turn Off Time Less Than 2µSec
8 SOP
APPLICATIONS
Precision Timing
Pulse Generation
Time Delay Generation
Sequential Timing
ORDERING INFORMATION
BLOCK DIAGRAM
Device Package
LM555CN 8 DIP
LM555CM 8 SOP
LM555CIN 8 DIP
LM555CIM 8 SOP
Operating Temperature
0 ~ +70°C
-40 ~ +85°C
©1999 Fairchild Semiconductor Corporation
Rev. B



No Preview Available !

LM555/I
SINGLE TIMER
ABSOLUTE MAXIMUM RATINGS (TA = 25°C)
Characteristic
Supply Voltage
Lead Temperature (soldering 10sec)
Power Dissipation
Operating Temperature Range LM555C
LM555CI
Storage Temperature Range
Symbol
VCC
TLEAD
PD
TOPR
TSTG
Value
16
300
600
0 ~ + 70
- 40 ~ + 85
- 65 ~ + 150
Unit
V
°C
mW
°C
°C
°C
ELECTRICAL CHARACTERISTICS
(TA = 25°C, VCC = 5 ~ 15V, unless otherwise specified)
Characteristic
Supply Voltage
Supply Current
1(low stable)
Timing Error
(Monostable)
2Initial Accuracy
Drift with Temperature
Drift with Supply Voltage
Timing Error
(astable)
2Intial Accuracy
Drift with Temperature
Drift with Supply Voltage
Control Voltage
Threshold Voltage
3Threshold Current
Trigger Voltage
Trigger Voltage
Trigger Current
Reset Voltage
Reset Current
Symbol
VCC
ICC
Test Conditions
VCC = 5V, RL =
VCC = 15V, RL =
ACCUR
t/T
t/VCC
RA = 1Kto
100K
C = 0.1µF
ACCUR
t/T
t/VCC
VC
VTH
ITH
VTR
VTR
ITR
VRST
IRST
RA = 1Kto 100K
C = 0.1µF
VCC = 15V
VCC = 5V
VCC = 15 V
VCC = 5V
VCC = 5V
VCC = 15V
VTR = 0V
Min Typ Max
4.5 16
36
7.5 15
Unit
V
mA
mA
1.0 3.0
50
0.1 0.5
%
ppm/°C
%/V
2.25
150
0.3
9.0 10.0 11.0
2.6 3.33 4.0
10.0
3.33
0.1 0.25
1.1 1.67 2.2
4.5 5 5.6
0.01
2.0
0.4 0.7 1.0
0.1 0.4
%
ppm/°C
%/V
V
V
V
V
µA
V
V
µA
V
mA



No Preview Available !

LM555/I
SINGLE TIMER
ELECTRICAL CHARACTERISTICS
(TA = 25°C, VCC = 5 ~ 15V, unless otherwise specified)
Characteristic
Low Output Voltage
High Output Voltage
Rise Time of Output
Fall Time of Output
Discharge Leakage Current
Symbol
VOL
VOH
tR
tF
ILKG
Test
Conditions
VCC = 15V
ISINK = 10mA
ISINK = 50mA
VCC = 5V
ISINK = 5mA
VCC = 15V
ISOURCE = 200mA
ISOURCE = 100mA
VCC = 5V
ISOURCE = 100mA
Min
12.75
2.75
Typ
0.06
0.3
0.05
12.5
13.3
3.3
100
100
20
Max
0.25
0.75
0.35
100
Unit
V
V
V
V
V
V
ns
ns
nA
Notes:
1. Supply current when output is high is typically 1mA less at VCC = 5V
2. Tested at VCC = 5.0V and VCC = 15V
3. This will determine maximum value of RA + RB for 15V operation, the max. total R = 20M, and for 5V operation the
max. total R = 6.7M
APPLICATION CIRCUIT



No Preview Available !

LM555/I
SINGLE TIMER
APPLICATION NOTE
The application circuit shows astable mode.
Pin 6 (threshold) is tied to Pin 2 (trigger) and Pin 4 (reset) is tied to VCC (Pin 8).
The external capacitor C1 of Pin 6 and Pin 2 charges through RA, RB and discharges through RB only.
In the internal circuit of the LM555 one input of the upper comparator is the 2/3 VCC (R1 =R2=R3, another input if it
If it is connected Pin 6.
As soon as charging C1 is higher than 2/3 Vcc, discharge transistor Q1 turns on and C1 discharges to collector of
transistor Q1.
Therefore, the flip-flop circuit is reset and output is low.
One input of lower comparator is the 1/3 VCC, discharge transistor Q1 turn off and C1 charges through RA and RB.
Therefore, the flip-flop circuit is set and output is high.
So to say, when C1 charges through RA and R1 output is high and when C1 discharges through RB output is low.
The charge time (output is high) T1 is 0.693 (RA+RB) C1 and the discharge time (output is low) T2 is 0.693 (RB C1).
(In VVCCCC--12//33=VV0CC.CC693)
Thus the total period time T is given by
T=T1 +T2 = 0.693 (RA +2RB) C1.
Then the frequency of astable mode is given by
f= =1
T
1.44
(RA + 2RB)C1
The duty cycle is given by
D.C = =TT2
RB
RA + 2RB
If you make use of the LM556 you can make two astable modes.




LM555I datasheet pdf
Download PDF
LM555I pdf
View PDF for Mobile


Similiar Datasheets : LM55107A LM55108A LM55109 LM55110 LM55121 LM55122 LM5520 LM5521 LM5522 LM5523 LM5524 LM5525 LM5528 LM5529 LM55325 LM5534 LM5535 LM5538 LM5539 LM555 LM555 LM555 LM555 LM555C LM555C LM555C LM555I LM555JAN LM555QML LM556

Index :   0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z   

This is a individually operated, non profit site. If this site is good enough to show, please introduce this site to others.
Since 2010   ::   HOME   ::   Privacy Policy + Contact