Replacement of
NE555
MIK555
Single Precision Timer
October 1993-revised October 1999
Description
These devices are monolithic timing circuits capable of producing accurate time delays or oscillation. In the time delay mode of
operation, the timed interval is controlled by a single external resistor and capacitor 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 C
Direct Replacement for Signetics MIK555 Timer
Applications
Precision timing
Pulse generation
Sequential timing
Time delay generation
Pulse width modulation
Pulse position modulation
Missing pulse detector
Block diagram
RESET can override TRIGGER, which can override
THRESHOLD
Pin Configuration
TOP VIEW
Absolute Maximum Ratings
(T
A
=25C, unless otherwise specified)
Parameter Min
Max
Units
Supply 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
STG
-65
+150
C
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 shown are nominal
Page 1 of 3
Replacement of
NE555
MIK555
Single Precision Timer
October 1993-revised October 1999
Typical Application Data
NOTE A: Bypassing the control
voltage input to ground with a
capacitor may improve
operation. This should be
evaluated for individual
applications.
Figure 1 Circuit for astable operation
Figure 2. Circuit for monostable operation
Electrical characteristics
(T
A
=25C, V
CC
=+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
A
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
monostable
(Note 4)
T
A
=25C
1
3 %
Initial Error of
Timing Interval (Note 3)
astable
(Note 5)
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
=25C
0.1
0.5
%/V
Timing Interval
astable
0.3
1
Output Pulse Rise Time
C
L
=15pF, T
A
=25C
100
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
, and V
CC
=15V, the maximum value is 10 M
.
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
to 100 K,
C=0.1F.
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
to 100 K,
C=0.1F.
Page 2 of 3
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