Features
■ Very low power consumption:
110 µA typ at V
90 µa typ at V
■ High maximum astable frequency of 2.7 MHz
■ Pin-to-pin functionally-compatible with bipolar
CC
CC
= 5 V
= 3 V
NE555
■ Wide voltage range: +2 V to +16 V
■ Supply current spikes reduced during output
transitions
■ High input impedance: 10
■ Output compatible with TTL, CMOS and logic
12
Ω
MOS
Description
TS555
Low power single CMOS timer
N
DIP8
(Plastic package)
D
SO8
(Plastic micropackage)
The TS555 is a single CMOS timer with a very
low consumption:
(I
cc(TYP)
I
cc(TYP)
TS555 = 110 µA at V
NE555 = 3 mA),
= +5 V versus
CC
and high frequency:
(f
f
(max)
TS555 = 2.7 MHz versus
f(max.)
NE555 = 0.1 MHz).
Timing remains accurate in both monostable and
astable mode.
The TS555 provides reduced supply current
spikes during output transitions, which enable the
use of lower decoupling capacitors compared to
those required by bipolar NE555.
12
With the high input impedance (10
Ω), timing
capacitors can also be minimized.
P
TSSOP8
(Thin shrink small outline package)
Pin connections
(top view)
GND
Trigger
Output
Reset
1
2
3
4
8
7
6
5
V
CC
Discharge
Threshold
Control
Voltage
November 2008 Rev 2 1/20
www.st.com
20
Absolute maximum ratings and operating conditions TS555
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
V
I
OUT
CC
Supply voltage +18 V
Output current ± 100 mA
Thermal resistance junction to ambient
(1)
R
thja
DIP8
(2)
SO8
TSSOP8
(2)
85
125
120
°C/W
Thermal resistance junction to case
(1)
R
thjc
T
j
T
stg
ESD
1. Short-circuits can cause excessive heating. These values are typical and specified for a single layer PCB.
2. Short-circuits can cause excessive heating. These values are typical and specified for a four layers PCB.
3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
4. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins remain floating.
5. Charged device model: all pins plus package are charged together to the specified voltage and then
discharged directly to the ground.
Table 2. Operating conditions
DIP8
(2)
SO8
TSSOP8
(2)
Junction temperature +150 °C
Storage temperature range -65 to +150 °C
Human body model (HBM)
Charged device model (CDM)
(3)
(4)
(5)
41
40
37
1500
200
1000
°C/W
VMachine model (MM)
Symbol Parameter Value Unit
V
I
OUT
CC
Supply voltage 2 to 16 V
Output sink current
Output source current
Operating free air temperature range
T
oper
TS555C
TS555I
TS555M
2/20
10
50
0 to +70
-40 to +125
-55 to +125
mA
°C
TS555 Schematic diagrams
R1
50k
Ω
Τ1
R2
50k
Ω
R3
50k
Ω
R4
50k
Ω
R5
50k
Ω
R6
50k
Ω
Τ2
Τ4
Threshold
Τ5
Τ6
Τ7
Τ14
Τ8
Τ9
Τ15
Τ16
Τ17
Τ18 Τ19
Trigger
Τ24
Τ22
Τ23
Τ28
Τ29
Τ32
Τ35
Τ33
Discharge
Output
Τ10
Τ11
Τ12 Τ13
Τ20
Τ21
Τ26
Τ25
Τ27 Τ30
Τ31
Τ34
GND
RESET
V
CC
R7
2 Schematic diagrams
Figure 1. Schematic diagram
3/20
Schematic diagrams TS555
Output
Discharge
Ground
Trigger
Control
Voltage
Threshold
V
CC
Reset
1
6
5
2
8
4
R
R
R
B
A
R1
R
S
Q
+
-
+
-
7
3
TS555
Figure 2. Block diagram
Table 3. Functions table
Reset Trigger Threshold Output
Low x x Low
High Low x High
High High High Low
High High Low Previous state
Note: LOW: level voltage ≤ minimum voltage specified.
HIGH: level voltage ≥ maximum voltage specified.
x: irrelevant.
4/20
TS555 Electrical characteristics
3 Electrical characteristics
Table 4. Static electrical characteristics
= +2 V, T
V
CC
Symbol Parameter Min. Typ. Max. Unit
= +25° C, Reset to VCC (unless otherwise specified)
amb
I
CC
V
V
I
DIS
V
V
V
TRIG
I
TRIG
I
V
RESET
I
RESET
Supply current (no load, high and low states)
≤ T
T
min.
amb
≤ T
max
Control voltage level
CL
T
min.
≤ T
amb
≤ T
max
Discharge saturation voltage (I
DIS
T
min.
≤ T
amb
≤ T
max
= 1 mA)
dis
1.2
1.1
65 200
1.3 1.4
0.05 0.2
Discharge pin leakage current 1 100 nA
Low level output voltage (I
OL
T
min.
≤ T
amb
High level output voltage (I
OH
T
min.
≤ T
amb
Trigger voltage
≤ T
T
min.
amb
≤ T
≤ T
≤ T
max
max
max
sink
source
= 1 mA)
= -0.3 mA)
1.5
1.5
0.4
0.3
0.1 0.3
1.9
0.67 0.95
Trigger current 10 pA
Threshold current 10 pA
TH
Reset voltage
T
≤ T
min.
amb
≤ T
max
0.4
0.3
1.1 1.5
Reset current 10 pA
200
1.5
0.25
0.35
1.05
2.0
µA
V
V
V
V
V
V
5/20
Electrical characteristics TS555
Table 5. Static electrical characteristics
= +3 V, T
V
CC
Symbol Parameter Min. Typ. Max. Unit
= +25° C, Reset to VCC (unless otherwise specified)
amb
I
CC
V
V
I
DIS
V
V
V
TRIG
I
TRIG
I
V
RESET
I
RESET
Supply current (no load, high and low states)
T
≤ T
amb
≤ T
max
min.
Control voltage level
CL
T
min.
≤ T
amb
≤ T
max
Discharge saturation voltage (I
DIS
T
min.
≤ T
amb
≤ T
max
= 1 mA)
dis
1.8
1.7
90 230
22.2
0.05 0.2
Discharge pin leakage current 1 100 nA
Low level output voltage (I
OL
T
min.
≤ T
amb
High level output voltage (I
OH
T
min.
≤ T
amb
Trigger voltage
≤ T
T
min.
amb
≤ T
≤ T
≤ T
max
max
max
sink
source
= 1 mA)
= -0.3 mA)
2.5
2.5
0.9
0.8
0.1 0.3
2.9
11.1
Trigger current 10 pA
Threshold current 10 pA
TH
Reset voltage
≤ T
T
min.
amb
≤ T
max
0.4
0.3
1.1 1.5
Reset current 10 pA
230
2.3
0.25
0.35
1.2
2.0
µA
V
V
V
V
V
V
6/20
TS555 Electrical characteristics
Table 6. Dynamic electrical characteristics
= +3 V, T
V
CC
Symbol Parameter Min. Typ. Max. Unit
Timing accuracy (monostable)
R = 10 kΩ, C = 0.1 µF
V
=2V
CC
V
=3V
CC
Timing shift with supply voltage variations
(monostable)
R = 10 kΩ, C = 0.1 µF, VCC = 3 V ± 0.3 V
Timing shift with temperature
T
≤ T
amb
≤ T
f
min.
Maximum astable frequency
max
RA = 470 Ω, RB = 200 Ω, C = 200 pF
Astable frequency accuracy
RA = RB = 1 kΩ to 100 kΩ, C = 0.1 µF 5
= +25° C, Reset to VCC (unless otherwise specified)
amb
(1)
1
1
(1)
(1)
.5 75
max
(2)
0.5
2
(2)
%
%/V
ppm/°C
MHz
%
Timing shift with supply voltage variations
(astable mode)
RA = RB = 1 kΩ to 100 kΩ, C = 0.1 µF,
VCC = 3 to 5 V
t
Output rise time (C
R
t
Output fall time (C
F
Trigger propagation delay 100 ns
t
PD
t
RPW
1. See Figure 4.
2. See Figure 6.
Minimum reset pulse width (V
(2)
0.5 %/V
= 10 pF) 25 ns
load
= 10 pF) 20 - ns
load
= 3 V) 350 ns
trig
7/20
Electrical characteristics TS555
Table 7. Static electrical characteristics
= +5 V, T
V
CC
Symbol Parameter Min. Typ. Max. Unit
= +25° C, Reset to VCC (unless otherwise specified)
amb
I
CC
V
V
I
DIS
V
V
V
TRIG
I
TRIG
I
V
RESET
I
RESET
Supply current (no load, high and low states)
T
≤ T
amb
≤ T
max
min.
Control voltage level
CL
T
min.
≤ T
amb
≤ T
max
Discharge saturation voltage (I
DIS
T
min.
≤ T
amb
≤ T
max
= 10 mA)
dis
2.9
2.8
110 250
3.3 3.8
0.2 0.3
Discharge pin leakage current 1 100 nA
Low level output voltage (I
OL
T
min.
≤ T
amb
High level output voltage (I
OH
T
min.
≤ T
amb
Trigger voltage
≤ T
T
min.
amb
≤ T
≤ T
≤ T
max
max
max
sink
source
= 8 mA)
= -2 mA)
4.4
4.4
1.36
1.26
0.3 0.6
4.6
1.67 1.96
Trigger current 10 pA
Threshold current 10 pA
TH
Reset voltage
≤ T
T
min.
amb
≤ T
max
0.4
0.3
1.1 1.5
Reset current 10 pA
250
3.9
0.35
0.8
2.06
2.0
µA
V
V
V
V
V
V
8/20
TS555 Electrical characteristics
m
Table 8. Dynamic electrical characteristics
= +5 V, T
V
CC
Symbol Parameter Min. Typ. Max. Unit
Timing accuracy (monostable)
R = 10 kΩ, C = 0.1 µF
= +25° C, Reset to VCC (unless otherwise specified)
amb
(1)
2%
Timing shift with supply voltage variations
(monostable)
Timing shift with temperature
f
Maximum astable frequency
max
Astable frequency accuracy
Timing shift with supply voltage variations
(astable mode)
t
Output rise time (C
R
t
Output fall time (C
F
t
t
RPW
1. See Figure 4.
2. See Figure 6.
Trigger propagation delay 100 ns
PD
Minimum reset pulse width (V
(1)
R = 10 kΩ, C = 0.1 µF,V
T
≤ T
≤ T
min.
amb
5 75 ppm/°C
max
RA = 470 Ω, RB = 200 Ω, C = 200 pF
= 5 V ± 1 V 0.38 %/V
CC
(1)
(2)
2.7 MHz
(2)
RA = RB = 1 kΩ to 100 kΩ, C = 0.1 µF 3 %
(2)
RA = RB = 10 kΩ, C = 0.1 µF, VCC = 5 to 12 V 0.1 %/V
= 10 pF) 25 ns
load
= 10 pF) 20 - ns
load
= 5 V) 350 ns
trig
9/20
Electrical characteristics TS555
Table 9. Static electrical characteristics
= +12 V, T
V
CC
Symbol Parameter Min. Typ. Max. Unit
= +25° C, Reset to VCC (unless otherwise specified)
amb
I
V
V
I
V
V
V
I
TRIG
V
RESET
I
RESET
Table 10. Dynamic electrical characteristics
Supply current (no load, high and low states)
CC
T
min.
≤ T
amb
≤ T
max
Control voltage level
CL
DIS
DIS
OL
OH
T
≤ T
≤ T
amb
amb
≤ T
≤ T
max
max
= 80 mA)
dis
min.
Discharge saturation voltage (I
T
min.
Discharge pin leakage current 1 100 nA
Low level output voltage (I
≤ T
amb
≤ T
max
T
min.
High level output voltage (I
≤ T
amb
≤ T
max
T
min.
sink
source
= 50 mA)
= -10 mA)
Trigger voltage
TRIG
T
min.
≤ T
amb
≤ T
max
Trigger current 10 pA
I
Threshold current 10 pA
TH
Reset Voltage
≤ T
amb
≤ T
max
T
min.
Reset current 10 pA
= +12 V, T
V
CC
= +25° C, Reset to VCC (unless otherwise specified)
amb
7.4
7.3
10.5
10.5
3.2
3.1
0.4
0.3
170 400
400
88.6
8.7
0.09 1.5
2.0
1.2 2
2.8
11
44.8
4.9
1.1 1.5
2.0
Symbol Parameter Min. Typ. Max. Unit
Timing accuracy (monostable)
R = 10 kΩ, C = 0.1 µF, VCC = +12 V
Timing shift with supply voltage variations
(monostable)
(1)
R = 10 kΩ, C = 0.1 µF, VCC = +5 V ±1 V
(1)
4%
0.38 %/V
µA
V
V
V
V
V
V
Timing shift with temperature
T
≤ T
≤ T
, VCC = +5 V 75 ppm/°C
max.
(2)
f
max
min.
amb
Maximum astable frequency
RA = 470 Ω, RB = 200 Ω, C = 200 pF, VCC = +5 V
Astable frequency accuracy
R
= RB = 1 kΩ to 100 kΩ, C = 0.1 µF,
A
= +12 V
V
CC
Timing shift with supply voltage variations
(astable mode)
= RB = 1 kΩ to 100 kΩ, C = 0.1 µF,
R
A
VCC = 5 to +12 V
1. See Figure 4.
2. See Figure 6.
10/20
2.7 MHz
3%
0.1 %/V
TS555 Electrical characteristics
Figure 3. Supply current (per timer) versus supply voltage
300
μ
CC
200
100
SUPPLY CU RRENT, I ( A)
0 4 8 12 16
SUPPLY VOLTAGE, V (V)
CC
11/20
Application information TS555
4 Application information
4.1 Monostable operation
In monostable mode, the timer operates like a one-shot generator. The external capacitor is
initially held discharged by a transistor inside the timer, as shown in Figure 4.
Figure 4. Application schematic
V
CC
Reset
R
Trigger
4
2
8
7
6
5
1
Out
TS555
3
The circuit triggers on a negative-going input signal when the level reaches 1/3 V
C
Control Voltage
μ
0.01 F
. Once
CC
triggered, the circuit remains in this state until the set time has elapsed, even if it is triggered
again during this interval. The duration of the output HIGH state is given by t = 1.1 R x C.
Since the charge rate and threshold level of the comparator are both directly proportional to
the supply voltage, the timing interval is independent of the supply. Applying a negative
pulse simultaneously to the Reset terminal (pin 4) and the Trigger terminal (pin 2) during the
timing cycle discharges the external capacitor and causes the cycle to start over. The timing
cycle then starts on the positive edge of the reset pulse. While the reset pulse is applied, the
output is driven to the LOW state.
When a negative trigger pulse is applied to pin 2, the flip-flop is set, releasing the short
circuit across the external capacitor and driving the output HIGH. The voltage across the
capacitor increases exponentially with the time constant τ = R x C.
When the voltage across the capacitor equals 2/3 V
, the comparator resets the flip-flop
CC
which then discharges the capacitor rapidly and drives the output to its LOW state. Figure 5
shows the actual waveforms generated in this mode of operation.
When Reset is not used, it should be tied high to avoid any false triggering.
Figure 5. Timing diagram
t = 0.1 ms / div
INPUT = 2.0V/div
OUTPUT VOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 2.0V/div
R = 9.1k , C = 0.01 F , R = 1.0k
12/20
μ
Ω
Ω
L
TS555 Application information
4.2 Astable operation
When the circuit is connected as shown in Figure 6 (pins 2 and 6 connected) it triggers itself
and runs as a multi-vibrator. The external capacitor charges through R
discharges through R
only. Therefore, the duty cycle may be precisely set by the ratio of
B
these two resistors.
and RB and
A
In the astable mode of operation, C charges and discharges between 1/3 V
and 2/3 VCC.
CC
As in the triggered mode, the charge and discharge times, and therefore frequency, are
independent of the supply voltage.
Figure 6. Application schematic
V
CC
Reset
R
A
R
B
C
Control
Voltage
0.01 F
8
4
Out
3
7
TS555
5
μ
1
6
2
Figure 7 shows actual waveforms generated in this mode of operation.
The charge time (output HIGH) is given by:
t1 = 0.693 (R
+ RB) C
A
The discharge time (output LOW) by:
t2 = 0.693 x R
x C
B
Thus the total period T is given by:
T = t1 + t2 = 0.693 (R
+ 2RB) C
A
The frequency of oscillation is then:
f =
1
--- =
T
1.44
-------------------------------------(RA 2RB) C+
The duty cycle is given by:
D =
Figure 7. Timing diagram
RB
--------------------------RA 2RB+
t = 0.5 ms / div
OUTPUT VOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 1.0V/div
R = R = 4.8 k , C = 0.1 F , R = 1.0k
AB
13/20
μ
ΩΩ
L
Package information TS555
5 Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in
ECOPACK
category of second level interconnect is marked on the package and on the inner box label,
in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics
trademark. ECOPACK specifications are available at: www.st.com
®
packages. These packages have a lead-free second level interconnect. The
.
14/20
TS555 Package information
5.1 DIP8 package information
Figure 8. DIP8 package mechanical drawing
Table 11. DIP8 package mechanical data
Dimensions
Ref.
Min. Typ. Max. Min. Typ. Max.
A5.330.210
A1 0.38 0.015
A2 2.92 3.30 4.95 0.115 0.130 0.195
b 0.36 0.46 0.56 0.014 0.018 0.022
b2 1.14 1.52 1.78 0.045 0.060 0.070
c 0.20 0.25 0.36 0.008 0.010 0.014
D 9.02 9.27 10.16 0.355 0.365 0.400
E 7.62 7.87 8.26 0.300 0.310 0.325
E1 6.10 6.35 7.11 0.240 0.250 0.280
e 2.54 0.100
eA 7.62 0.300
eB 10.92 0.430
L 2.92 3.30 3.81 0.115 0.130 0.150
Millimeters Inches
15/20
Package information TS555
5.2 SO-8 package information
Figure 9. SO-8 package mechanical drawing
Table 12. SO-8 package mechanical data
Dimensions
Ref.
Min. Typ. Max. Min. Typ. Max.
A1.750.069
A1 0.10 0.25 0.004 0.010
A2 1.25 0.049
b 0.28 0.48 0.011 0.019
c 0.17 0.23 0.007 0.010
D 4.80 4.90 5.00 0.189 0.193 0.197
E 5.80 6.00 6.20 0.228 0.236 0.244
E1 3.80 3.90 4.00 0.150 0.154 0.157
e 1.27 0.050
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
L1 1.04 0.040
k1° 8°1° 8°
ccc 0.10 0.004
Millimeters Inches
16/20
TS555 Package information
5.3 TSSOP8 package information
Figure 10. TSSOP8 package mechanical drawing
Table 13. TSSOP8 package mechanical data
Dimensions
Ref.
Min. Typ. Max. Min. Typ. Max.
A 1.2 0.047
A1 0.05 0.15 0.002 0.006
A2 0.80 1.00 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c 0.09 0.20 0.004 0.008
D 2.90 3.00 3.10 0.114 0.118 0.122
E 6.20 6.40 6.60 0.244 0.252 0.260
E1 4.30 4.40 4.50 0.169 0.173 0.177
e 0.65 0.0256
k0° 8°0° 8°
L 0.45 0.60 0.75 0.018 0.024 0.030
L1 1 0.039
aaa 0.1 0.004
Millimeters Inches
17/20
Ordering information TS555
6 Ordering information
Table 14. Order codes
Order code Temperature range Package Packaging Marking
TS555CN
TS555CD
TS555CDT
TS555CPT TSSOP8 Tape & reel 555C
TS555IN
TS555ID
TS555IDT
TS555IPT TSSOP8 Tape & reel 555I
TS555MN
TS555MD
TS555MDT
TS555MPT TSSOP8 Tape & reel 555M
0°C, +70°C
-40°C, +125°C
-55°C, +125°C
DIP8 Tube TS555CN
SO-8
DIP8 Tube TS555IN
SO-8
DIP8 Tube TS555CM
SO-8
Tube or
Tape & reel
Tube or
Tape & reel
Tube or
Tape & reel
555C
555I
555M
18/20
TS555 Revision history
7 Revision history
Table 15. Document revision history
Date Revision Changes
01-Feb-2003 1 Initial release.
Document reformatted.
03-Nov-2008 2
Added output current, ESD and thermal resistance values in
Table 1: Absolute maximum ratings.
Added output current values in Table 2: Operating conditions.
19/20
TS555
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2008 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
20/20
Loading...