NE555
SA555 - SE555
GENERAL PURPOSE SINGLE BIPOLAR TIMERS
.
.
.
.
.
.
.
.
LOW TURN OFF TIME
MAXIMUM
OPERATING
FREQUENCY
GREATER THAN 500kHz
TIMING FROM MICROSECONDS TO HOURS
OPERATES IN BOTH ASTABLE AND
MONOSTABLE MODES
HIGH OUTPUT CURRENT CAN SOURCE OR
SINK 200mA
ADJUSTABLE DUTY CYCLE
TTL COMPATIBLE
TEMPERATURE STABILITY OF 0.005%
PER
o
C
N
DIP8
(Plastic Package)
D
SO8
(Plastic Micropackage)
DESCRIPTION
The NE555 monolithic timing circuit is a highly stable
controller capableof producing accuratetime delays
or oscillation. In the time delay mode of operation,
the time is precisely controlled by one external re-
sistor and capacitor.For a stableoperation as an os-
cillator, the free running frequency and the duty cy-
cle are both accurately controlled with two external
resistors and one capacitor. The circuit may be trig-
gered and reset on falling waveforms, and the out-
put structure can source or sink up to 200mA. The
NE555 is available in plastic and ceramic minidip
package and in a 8-lead micropackage and in metal
can package version.
PIN CONNECTIONS
(top view)
ORDER CODES
Part
Number
NE555
SA555
SE555
Temperature
Range
0 C, 70 C
–40 C, 105 C
–55 C, 125 C
o
o
o
o
o
o
Package
N
•
•
•
D
•
•
•
555-01.TBL
1
2
3
4
8
7
6
5
1
2
3
4
5
6
7
8
- GND
- Trigger
- Output
- Reset
- Control voltage
- Threshold
- Discharge
- V
CC
April 1995
1/10
NE555/SA555/SE555
BLOCK DIAGRAM
V
CC
+
5kΩ
COMP
THRESHOLD
CONTROL VOLTAGE
R
FLIP-FLOP
5kΩ
COMP
TRIGGER
DISCHARGE
Q
OUT
S
INHIBIT/
RESET
5kΩ
RESET
S
S - 808 6
SCHEMATIC DIAGRAM
CONTROL
VOLTAGE
THRESHOLD
COMPARATOR
V
CC
R1
4.7kΩ
R2
830Ω
R3
4.7kΩ
5
OUTPUT
R4 R8
1k
Ω
5k
Ω
R12
6.8kΩ
Q21
Q19
Q20
Q22
Q5
Q6
Q7
Q8
Q9
R13
R11
5kΩ
THRESHOLD
Q1
Q2
Q3
Q11 Q12
TRIGGER
2
Q10
Q4
3.9kΩ
3
R17
4.7k
Ω
Q23
D1
R9
5kΩ
Q13
Q16
D2
R14
220Ω
Q24
Q18
R16
100
Ω
R15
4.7kΩ
RESET
DISCHARGE
4
7
Q14
1
Q15
Q17
R5
10kΩ
R6
100kΩ
R7
100kΩ
R10
5kΩ
555-04.EPS
GN D
TRIGGER COMPARATOR
FLIP FLOP
ABSOLUTE MAXIMUM RATINGS
Symbol
V
cc
T
oper
Supply Voltage
Operating Free Air Temperature Range
for NE555
for SA555
for SE555
Parameter
Value
18
0 to 70
–40 to 105
–55 to 125
150
–65 to 150
Unit
V
o
C
555-02.TBL
T
j
T
stg
Junction Temperature
Storage Temperature Range
o
o
C
C
2/10
555-03.EPS
NE555/SA555/SE555
OPERATING CONDITIONS
Symbol
V
CC
V
th
, V
trig
, V
cl
, V
reset
Supply Voltage
Maximum Input Voltage
Parameter
SE555
4.5 to 18
V
CC
NE555 - SA555
4.5 to 16
V
CC
Unit
V
V
555-03.TBL
555-04.TBL
ELECTRICAL CHARACTERISTICS
T
amb
= +25
o
C, V
CC
= +5V to +15V (unless otherwise specified)
Symbol
I
CC
Parameter
Supply Current (R
L
∞)
(- note 1)
Low State
V
CC
= +5V
V
CC
= +15V
High State
V
CC
= 5V
Timing Error (monostable)
(R
A =
2k to 100kΩ, C = 0.1µF)
Initial Accuracy - (note 2)
Drift with Temperature
Drift with Supply Voltage
Timing Error (astable)
(R
A
, R
B
= 1kΩ to 100kΩ, C = 0.1µF,
V
CC
= +15V)
Initial Accuracy - (note 2)
Drift with Temperature
Drift with Supply Voltage
V
CL
Control Voltage level
V
CC
= +15V
V
CC
= +5V
Threshold Voltage
V
CC
= +15V
V
CC
= +5V
Threshold Current - (note 3)
Trigger Voltage
V
CC
= +15V
V
CC
= +5V
Trigger Current (V
trig
= 0V)
Reset Voltage - (note 4)
Reset Current
V
reset
= +0.4V
V
reset
= 0V
V
OL
Low Level Output Voltage
V
CC
= +15V, I
O(sink)
= 10mA
I
O(sink)
= 50mA
I
O(sink)
= 100mA
I
O(sink)
= 200mA
V
CC
= +5V, I
O(sink)
= 8mA
I
O(sink)
= 5mA
High Level Output Voltage
V
CC
= +15V, I
O(source)
= 200mA
I
O(source)
= 100mA
V
CC
= +5V, I
O(source)
= 100mA
0.1
0.4
0.1
0.4
2
2.5
0.1
0.05
12.5
13.3
3.3
0.4
1
0.15
0.5
2.2
0.25
0.2
0.1
0.4
0.1
0.4
2
2.5
0.3
0.25
12.5
13.3
3.3
0.4
1.5
V
0.25
0.75
2.5
0.4
0.35
V
13
3
12.75
2.75
0.4
4.8
1.45
9.6
2.9
9.4
2.7
SE555
Min.
Typ.
3
10
2
Max.
5
12
NE555 - SA555
Min.
Typ.
3
10
2
Max.
6
15
Unit
mA
0.5
30
0.05
2
100
0.2
1
50
0.1
3
0.5
%
ppm/°C
%/V
1.5
90
0.15
10
3.33
10
3.33
0.1
5
1.67
0.5
0.7
10.4
3.8
10.6
4
0.25
5.2
1.9
0.9
1
0.4
4.5
1.1
9
2.6
8.8
2.4
2.25
150
0.3
10
3.33
10
3.33
0.1
5
1.67
0.5
0.7
11
4
%
ppm/°C
%/V
V
V
th
V
11.2
4.2
0.25
5.6
2.2
2.0
1
µA
V
mA
µA
V
I
th
V
trig
I
trig
V
reset
I
reset
V
OH
Notes :
1. Supply current when output is high is typically 1mA less.
2. Tested at V
CC
= +5V and V
CC
= +15V.
3. This will determine the maximum value of R
A
+ R
B
for +15V operation the max total is R = 20MΩ and for 5V operation,
the max total R = 3.5MΩ.
3/10
NE555/SA555/SE555
ELECTRICAL CHARACTERISTICS
(continued)
Symbol
I
dis (off)
V
dis(sat)
Parameter
Discharge Pin Leakage Current
(output high) (V
dis
= 10V)
Discharge pin Saturation Voltage
(output low) - (note 5)
V
CC
= +15V, I
dis
= 15mA
V
CC
= +5V, I
dis
= 4.5mA
Output Rise Time
Output Fall Time
Turn off Time - (note 6) (V
reset
= V
CC
)
SE555
Min.
Typ.
20
Max.
100
NE555 - SA555
Min.
Typ.
20
Max.
100
Unit
nA
mV
180
80
100
100
0.5
480
200
200
200
180
80
100
100
0.5
480
200
555-05.TBL
555-08.EPS
555-06.EPS
t
r
t
f
t
off
Notes :
300
300
ns
µs
5. No protection against excessive Pin 7 current is necessary, providing the package dissipation rating will not be exceeded.
6. Time mesaured from a positive going input pulse from 0 to 0.8x V
CC
into the threshold to the drop from high to low of the
output trigger is tied to treshold.
Figure 1 :
Minimum Pulse Width Required for
Trigering
Figure 2 :
Supply Current versus Supply Voltage
Figure 3 :
Delay Time versus Temperature
555-05.EPS
Figure 4 :
Low Output Voltage versus Output
Sink Current
4/10
555-07.EPS
NE555/SA555/SE555
Figure 5 :
Low Output Voltage versus Output
Sink Current
Figure 6 :
Low Output Voltage versus Output
Sink Current
555-09.EPS
Figure 7 :
High Output Voltage Drop versus
Output
Figure 8 :
Delay Time versus Supply Voltage
555-11.EPS
Figure 9 :
Propagation Delay versus Voltage
Level of Trigger Value
555-13.EPS
5/10
555-12.EPS
555-10.EPS
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