SE555Q
AUTOMOTIVE GRADE PRECISION TIMERS
Description
SE555Q is precision timing circuit 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 5V
supply, output levels are compatible with TTL inputs.
Pin Assignments
(Top View)
GND
1
TRIG
2
OUT
3
RESET
4
SO-8
8
V
CC
7
DISCH
6
THRES
5
CONT
Features
Timing from Microseconds to Hours
Astable or Monostable Operation
Adjustable Duty Cycle
TTL Compatible Output Can Source or Sink up to 200mA
Automotive Grade
Qualified to AEC-Q100 Grade 1
―Green‖ Molding Compound (No Br, Sb)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
PPAP Capable (Note 4)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated‘s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green‖ products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
4. Automotive products are AEC-Q100 qualified and are PPAP capable. Refer to http://www.diodes.com/product_compliance_definitions.html.
SE555Q
Document number: DS39476 Rev. 1 - 2
1 of 14
www.diodes.com
January 2017
© Diodes Incorporated
SE555Q
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
Pin Name
GND
TRIG
OUT
RESET
CONT
THRES
DISCH
V
CC
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
Functional Block Diagram
V
CC
CONT
8
5
RESET
4
R1
THRES
6
R2
O
3
OUT
S
TRIG
2
7
1
DISCH
GND
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
SE555Q
Document number: DS39476 Rev. 1 - 2
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January 2017
© Diodes Incorporated
SE555Q
Absolute Maximum Ratings
(Note 5) (@ T
A
= +25C, unless otherwise stated.)
Symbol
V
CC
V
I
I
O
θ
JA
θ
JC
T
J
T
STG
Notes:
Parameter
Supply Voltage (Note 6)
Input Voltage
Output Current
Package Thermal Resistance Junction-to-Ambient (Note 7)
Package Thermal Resistance Junction-to-Case (Note 8)
Junction Temperature
Storage Temperature
CONT, RESET, THRES, TRIG
Rating
18
V
CC
±225
130
15
+150
-65 to +150
Unit
V
V
mA
°
C/W
°
C/W
°
C
°
C
5. 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.
6. All voltage values are with respect ground.
7. 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° can affect reliability.
C
8. 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° can affect reliability.
C
Recommended Operating Conditions
(T
A
= +25C)
Symbol
V
CC
V
I
I
O
T
A
Supply Voltage
Input Voltage
Output Current
Operating Ambient Temperature
CONT, RESET, THRES, TRIG
Parameter
Min
4.5
—
—
-40
Max
15
V
CC
±200
+125
Unit
V
V
mA
°
C
Electrical Characteristics
(V
CC
= 5V to 15V, T
A
= +25° unless otherwise stated.)
C,
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 9)
Trigger Voltage Level
Trigger Current
RESET Voltage Level
RESET Current
DISCH Switch Off-state Current
V
CC
= 15V
V
CC
= 5V
—
V
CC
= 15V
V
CC
= 5V
TRIG at 0V
—
RESET at V
CC
RESET at 0V
—
Test conditions
Min
8.8
2.4
—
4.5
1.1
—
0.3
—
—
—
—
—
9
2.6
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
DISCH Saturation Voltage with Output V
CC
= 15V, I
DIS
= 15mA
Low (Note 10)
V
CC
= 5V, I
DIS
= 4.5mA
CONT Voltage (Open Circuit)
V
CC
= 15V
V
CC
= 5V
SE555Q
Document number: DS39476 Rev. 1 - 2
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January 2017
© Diodes Incorporated
SE555Q
Electrical Characteristics
(Cont. V
CC
= 5V to 15V, T
A
= +25° unless otherwise stated.)
C,
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
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 12)
Each time, astable
(Note 13)
Temperature Coefficient of Timing
Interval
Each time, monostable
(Note 12)
Each time, astable
(Note 13)
Supply Voltage Sensitivity of Timing
Interval
Output Pulse Rise Time
Output Pulse Fall Time
Each time, monostable
(Note 12)
Each time, astable
(Note 13)
t
RI
t
FA
Notes:
Min
—
—
—
—
—
—
12.75
—
2.75
Typ.
0.1
0.4
2
2.5
0.1
0.15
13.3
12.5
3.3
10
3
9
2
1
2.25
50
150
0.1
0.3
100
100
Max
0.25
0.75
2.5
—
0.35
0.4
—
—
—
15
6
13
5
3
Unit
V
V
V
CC
= 15V
V
CC
= 5V
V
CC
= 15V
V
CC
= 5V
—
—
—
—
—
mA
T
ER
Initial Error of Timing Interval
(Note 11)
—
—
—
T
A
= full range
—
—
—
—
C
L
= 15pF
C
L
= 15pF
—
—
—
300
300
—
0.5
—
—
%
T
TC
ppm/°
C
T
VCC
%/V
ns
ns
9. 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
= 5V, the
maximum value is R = R
A
+ R
B
≉
3.4MΩ, and for V
CC
= 15V, the maximum value is 10MΩ.
10. No protection against excessive pin 7 current is necessary providing package dissipation rating is not exceeded.
11. Timing interval error is defined as the difference between the measured value and the average value of a random sample from each process run.
12. 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 = 0.1µF.
13. 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 = 0.1µF.
SE555Q
Document number: DS39476 Rev. 1 - 2
4 of 14
www.diodes.com
January 2017
© Diodes Incorporated
SE555Q
Typical Performance Characteristics
Low Level Output Voltage vs.
Low Level Output Current @ V
CC
= 5V
Low Level Output Voltage vs.
Low Level Output Current @ V
CC
= 10V
Low Level Output Voltage vs.
Low Level Output Current @ V
CC
= 15V
Drop Between Supply Voltage and Output vs.
High Level Output Current
Supply Current vs. Supply Voltage
Propagation Delay Time vs.
Lowest Voltage Level of Trigger Pulse
SE555Q
Document number: DS39476 Rev. 1 - 2
5 of 14
www.diodes.com
January 2017
© Diodes Incorporated
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