NE555/SA555/NA555
PRECISION TIMERS
Description
These devices are precision timing circuits capable of
producing accurate time delays or oscillation. In the time-
delay or monostable 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 can be controlled independently with two external
resistors and a single external capacitor.
The threshold and trigger levels normally are two-thirds and
one-third, respectively, of V
CC
. These levels can be altered
by use of the control-voltage terminal. When the trigger input
falls below the trigger level, the flip-flop is set, and the output
goes high. If the trigger input is above the trigger level and
the threshold input is above the threshold level, the flip-flop is
reset and the output is low. The reset (RESET) input can
override all other inputs and can be used to initiate a new
timing cycle. When RESET goes low, the flip-flop is reset,
and the output goes low. When the output is low, a low-
impedance path is provided between discharge (DISCH) and
ground.
The output circuit is capable of sinking or sourcing current up
to 200mA. Operation is specified for supplies of 5V to 15V.
With a 5-V supply, output levels are compatible with TTL
inputs.
Pin Assignments
(Top View)
GND
TRIG
OUT
RESET
SO-8
V
CC
DISCH
THRES
CONT
NEW PRODUCT
Features
•
•
•
•
•
•
Timing from microseconds to hours
Astable or monostable operation
Adjustable duty cycle
TTL compatible output can source or sink up to 200mA
“Green” Molding Compound (No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
Notes:
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
1 of 14
www.diodes.com
February 2012
© Diodes Incorporated
NE555/SA555/NA555
PRECISION TIMERS
Pin Descriptions
Pin Name
GND
TRIG
OUT
RESET
CONT
THRES
DISCH
V
CC
Pin Number
1
2
3
4
5
6
7
8
Ground
Trigger set 1/3V
CC
Timer output
Reset active low
External adjustment of internal threshold and trigger voltages
Threshold set to 2/3 V
CC
Low impedance discharge path
Chip supply voltage
Description
NEW PRODUCT
Functional Block Diagram
RESET can override TRIG, which can override THRESH
Functional Table
Pin Name
GND
TRIG
OUT
RESET
Nominal Trigger
Voltage
Irrelevant
<1/3V
CC
<1/3V
CC
<1/3V
CC
Threshold
Voltage
Irrelevant
Irrelevant
<2/3V
CC
<2/3V
CC
Output
Low
High
Low
Discharge
Switch
On
Off
On
As previously established
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
2 of 14
www.diodes.com
February 2012
© Diodes Incorporated
NE555/SA555/NA555
PRECISION TIMERS
Absolute Maximum Ratings
(Note 2) @ T
A
= 25°C unless otherwise stated
Symbol
V
CC
V
I
I
O
θ
JA
θ
JC
T
J
Supply voltage (Note 3)
Input voltage
Output current
Package thermal resistance Junction-to-Ambient (Note 4)
Package thermal resistance Junction-to-Case (Note 5)
Junction temperature
Storage temperature
CONT, RESET, THRES, TRIG
Parameter
Rating
18
V
CC
±225
130
15
150
-65 to 150
Unit
V
V
mA
°C/W
°C/W
°C
°C
NEW PRODUCT
T
STG
Recommended Operating Conditions
(T
A
= 25°C)
Symbol
V
CC
V
I
I
O
T
A
Notes:
Parameter
Supply voltage
Input voltage
Output current
NE555
Operating Ambient Temperature
SA555
NA555
CONT, RESET, THRES, TRIG
Min
4.5
Max
16
V
CC
±200
Unit
V
V
mA
°C
0
-40
-40
70
85
105
2. Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only.
Functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
3. All voltage values are with respect ground.
4. Maximum power dissipation is a function of T
J
(max),
θ
JA
, and T
A
. The maximum allowable power dissipation at any allowable ambient temperature
is P
D
= (T
J
(max) – T
A
)/θ
JA
. Operating at the absolute maximum T
J
of 150°C can affect reliability.
5. Maximum power dissipation is a function of T
J
(max),
θ
JC
, and T
A
. The maximum allowable power dissipation at any allowable ambient temperature
is P
D
= (T
J
(max) – T
C
)/θ
JA
. Operating at the absolute maximum T
J
of 150°C can affect reliability.
Electrical Characteristics
(V
CC
= 5V to 15V, T
A
= 25°C unless otherwise stated)
Symbol
V
TH
I
TH
V
TR
I
TR
V
RST
I
RST
I
DIS
V
DIS
V
CON
Parameter
Threshold voltage level
Threshold current (Note 6)
Trigger voltage level
Trigger current
RESET voltage level
RESET current
DISCH switch off-state current
DISCH saturation voltage with
output low (Note 7)
CONT voltage (open circuit)
V
CC
= 15V, I
DIS
= 15mA
V
CC
= 5V, I
DIS
= 4.5mA
V
CC
= 15V
V
CC
= 5V
9
2.6
RESET at V
CC
RESET at 0V
V
CC
= 15V
V
CC
= 5V
TRIG at 0V
0.3
4.5
1.1
V
CC
= 15V
V
CC
= 5V
Test conditions
Min
8.8
2.4
Typ.
10
3.3
30
5
1.67
0.5
0.7
0.1
-0.4
20
180
80
10
3.3
Max
11.2
4.2
250
5.6
2.2
2
1
0.4
-1.5
100
480
200
11
4
Unit
V
nA
V
µA
V
mA
nA
mV
V
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
3 of 14
www.diodes.com
February 2012
© Diodes Incorporated
NE555/SA555/NA555
PRECISION TIMERS
Electrical Characteristics
(V
CC
= 5V to 15V, T
A
= 25°C unless otherwise stated)
Symbol
Parameter
Test conditions
V
CC
= 15V, I
OL
= 10mA
V
CC
= 15V, I
OL
= 50mA
V
OL
Low level output voltage
V
CC
= 15V, I
OL
= 100mA
V
CC
= 15V, I
OL
= 200mA
V
CC
= 5V, I
OL
= 5mA
V
CC
= 5V, I
OL
= 8mA
Min
Typ.
0.1
0.4
2
2.5
0.1
0.15
12.75
2.75
V
CC
= 15V
V
CC
= 5V
V
CC
= 15V
V
CC
= 5V
13.3
12.5
3.3
10
3
9
2
1
2.25
50
ppm/°C
150
0.1
0.3
C
L
= 15pF
C
L
= 15pF
100
100
300
300
ns
ns
0.5
%/V
15
6
13
5
3
%
mA
V
0.35
0.4
Max
0.25
0.75
2.5
V
Unit
NEW PRODUCT
V
CC
= 15V, I
OH
= -100mA
V
OH
High level output voltage
V
CC
= 15V, I
OH
= -200mA
V
CC
= 5V, I
OH
= -100mA
Output low, no load
I
CC
Supply current
Output high, no load
Each time, monostable
(Note 9)
Each time, astable
(Note 10)
T
A
= full
range
T
ER
Initial error of timing interval
(Note 8)
T
TC
Each time, monostable
Temperature coefficient of timing (Note 9)
interval
Each time, astable
(Note 10)
Supply voltage sensitivity of
timing interval
Output pulse rise time
Output pulse fall time
Each time, monostable
(Note 9)
Each time, astable
(Note 10)
T
VCC
T
RI
T
FA
Notes:
6. This parameter influences the maximum value of the timing resistors R
A
and R
B
in the circuit of Figure 12. For example, when V
CC
= 5 V, the
maximum value is R = R
A
+ R
B
≉
3.4MΩ, and for V
CC
= 15 V, the maximum value is 10MΩ.
7. No protection against excessive pin 7 current is necessary providing package dissipation rating is not exceeded
8. Timing interval error is defined as the difference between the measured value and the average value of a random sample from each process run.
9. Values specified are for a device in a monostable circuit similar to Figure 9, with the following component values: R
A
= 2kΩ to 100kΩ, C = 0.1uF.
10. Values specified are for a device in an astable circuit similar to Figure 12, with the following component values: R
A
= 1kΩ to 100kΩ, C = 0.1uF.
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
4 of 14
www.diodes.com
February 2012
© Diodes Incorporated
NE555/SA555/NA555
PRECISION TIMERS
Typical Performance Characteristics
V
OL
- LOW - LEVEL OUTPUT VOLTAGE (V)
V
OL
- LOW - LEVEL OUTPUT VOLTAGE (V)
10
7
4
V
CC
= 5V
T
A
= 105°C
10
7
4
2
1
0.7
0.4
0.2
0.1
0.07
0.04
0.02
0.01
1
V
CC
= 10V
2
1
0.7
0.4
0.2
0.1
0.07
0.04
0.02
0.01
1
2
4
7 10
20
40 70 100
I
OL
- LOW LEVEL OUTPUT CURRENT (mA)
Low Level Output Voltage vs.
Low Level Output Current @ V
CC
= 5V
T
A
= 25°C
T
A
= 105°C
T
A
= 25°C
NEW PRODUCT
T
A
= -40°C
T
A
= -40°C
2
4
7 10
20
40 70 100
I
OL
- LOW LEVEL OUTPUT CURRENT (mA)
Low Level Output Voltage vs.
Low Level Output Current @ V
CC
= 10V
V
OL
- LOW - LEVEL OUTPUT VOLTAGE (V)
10
7
4
2
1
0.7
0.4
0.2
0.1
0.07
0.04
0.02
0.01
1
2
V
CC
= 15V
1.8
(V
CC
- V
OH
) VOLTAGE DROP (V)
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
V
CC
= 5V to 15V
T
A
= 25°C
T
A
= -40°C
T
A
= 105°C
T
A
= 105°C
T
A
= 25°C
T
A
= -40°C
2
4
7 10
20
40 70 100
I
OL
- LOW LEVEL OUTPUT CURRENT (mA)
Low Level Output Voltage vs.
Low Level Output Current @ V
CC
= 15V
0
1
2
4
7 10
20
40 70 100
I
OH
- HIGH LEVEL OUTPUT CURRENT (mA)
Drop Between Supply Voltage and Output vs.
High Level Output Current
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
5 of 14
www.diodes.com
February 2012
© Diodes Incorporated
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