N
E555
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 controlled by a single external resistor and capacit
or network. In the astable mode of operation, the frequency and duty cycle may be independently
controlled with two external resistors and a single 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 of 0.005% per
o
C
•
Direct Replacement for Signetics NE555 Timer
DIP-8 SOP-8
P
a
ck
a
Applications
•
Precision timing
•
Pulse generation
•
Sequential timing
•
Time delay generation
•
Pulse width modulation
•
Pulse position modulation
•
Missing pulse detector
Pin
Configuration
T
O
P VIEW
Int
e
a
l
Blo
c
k Di
g
r
a
m
RESET can override TRI
GG
ER,
w
hich can override
THRESHOLD
1
BEIJING ESTEK ELECTRONICS CO.,LTD
NE55
5
Absolute Maximum Ratings
(TA=25°C, unless otherwise specified)
Paramete
r
Mi
n
Ma
x
Units
Suppl
y
Voltage, V
CC
4.5
16
Input Voltage (control, reset, threshold and trigger)
V
CC
V
Output
Current,
I
0
±
200
mA
Operating
Free
-
Air
Temperature,
T
A
70
Storage Temperature Range,
T
S
TG
-
65
+150
°
C
Electrical characteristics
(TA=25°C, VCC=+5V to +15V, unless otherwise specified)
Parameter Test conditions
(Note 2)
Min Typ Max Units
Operating Supply Voltage Range 4.5 16 V
Threshold Voltage Level V
CC
=15V 8.8 10 11.2 V
V
CC
=5V 2.4 3.3 4.2
Threshold Current (Note 1) (see Note 1) 30 250 nA
Trigger Voltage Level V
CC
=15V 4.5 5 5.6 V
V
CC
=5V 1.1 1.67 2.2
Trigger Current Trigger at 0V 0.5 2 µA
Reset Voltage Level 0.3 0.7 1 V
Reset Current Reset at V
CC
0.1 0.4 mA
Reset at 0V -0.4 -1.5
Discharge Leakage Current 20 100 nA
Control Voltage Level V
CC
=15V 9 10 11 V
V
CC
=5V 2.6 3.3 4
Low-level Output Voltage V
CC
=15V I
OL
=10mA 0.1 0.25
I
OL
=50mA 0.4 0.75
I
OL
=100mA 2 2.5
I
OL
=200mA 2.5
V
CC
=5V I
OL
=5mA 0.25 0.35
I
OL
=8mA 0.3 0.4
High-level Output Voltage V
CC
=15V I
OL
=-100mA 12.75 13.3
I
OL
=-200mA 12.5
V
CC
=5V I
OL
=-100mA 2.75 3.3
Supply Current Output Low, V
CC
=15V 10 15 mA
No Load V
CC
=5V 3 6
Output High, V
CC
=15V 9 13
No Load V
CC
=5V 2 5
Initial E
rr
o
r
of
Timing Interval (Note 3)
monostable
(Note 4)
astable
(Note
5)
T
A
=25
°
C
1
3
%
5
13
Temperature Coefficient
monostable
T
A
=MIN to MAX
50
150
ppm /
°
C
of Timing Interval astable 150 500
Supply Voltage Sensitivity of monostable T
A
=25
°
C0.1 0.5 %/V
Timing Interval astable 0.3 1
Output Pulse Rise Time C
L
=15pF, T
A
=25
°
C100 300 ns
Output Pulse Fall Time 100 300
Note 1: This parameter influences the maximum value of the timing resistors R
A
and R
B
in the circuit on Fig 1. For example, when
V
CC
=5V, the maximum value is R=R
A
+R
B
=3.4 M
Ω
, and V
CC
=15V, the maximum value is 10 M
Ω
.
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: R
A
=2K
Ω
to 100 K
Ω
,
C=0.1µF.
Note 5: Values specified are for a device in an astable circuit similar to Fig. 1, with component values as follow: R
A
, R
B
=1K
Ω
to 100 K
Ω
,
C=0.1µF.
BEIJING ESTEK ELECTRONICS CO.,LTD
2
NE555
Function Table
Reset Trigger Voltage * Threshold Voltage * Output Discharge Switch
Low Irrelevant Irrelevant Low On
High < 1/3 V
CC
High High Off
High > 1/3 V
CC
> 2/3 V
CC
Low On
High > 1/3 V
CC
< 2/3 V
CC
As previously established
* Voltage levels sho
w
n are nominal
T
y
pi
c
a
l A
p
pli
c
ati
o
ns
C
ircui
t
F
igure
1
Circuit
for
astable
operatio
n
Figure 2. Circuit for monostable operation
NOTE
A:
B
y
passing
the
control
v
o
ltage
input
to
ground
w
ith
a
capacitor
may
impro
v
e
operation.
This
shoul
d
be
e
v
aluate
d
for
indiv
i
dual
applications.
Or
d
e
ri
n
g
I
n
for
m
a
t
io
n
O
R
DER
I
N
NU
M
B
E
R
P
A
C
K
A
E
M
A
R
K
I
N
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
3
BEIJING ESTEK ELECTRONICS CO.,LTD
GGG