Page 1
Features
Control
Voltage
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Discharge
Threshold
Reset
Output
Trigger
GND
Control
Voltage
+V
Discharge
Threshold
Reset
Output
Trigger
S
■ Very low power consumption:
220 µA typ at V
180 µA typ at V
■ High maximum astable frequency 2.7 MHz
■ Pin-to-pin and functionally compatible with
CC
CC
= 5 V
= 3 V
bipolar NE556
■ 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
TS556
Low-power dual CMOS timer
N
DIP14
(Plastic package)
D
SO14
(Plastic micropackage)
The TS556 is a dual CMOS timer which offers a
very low consumption:
(I
cc(TYP)
I
cc(TYP)
TS556 = 220 µA at VCC=+5V versus
NE556 = 6 mA),
and high frequency:
(f
TS556 = 2.7 MHz versus
(max.)
f
NE556 = 0.1 MHz).
(max.)
In both monostable and astable modes, timing
remains very accurate.
The TS556 provides reduced supply current
spikes during output transitions, which enable the
use of lower decoupling capacitors compared to
those required by bipolar NE556.
Due to the high input impedance (10
12
Ω), timing
capacitors can also be minimized.
Pin connections
(top view)
October 2008 Rev 2 1/19
www.st.com
19
Page 2
Absolute maximum ratings and operating conditions TS556
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
R
thja
DIP14
SO14
(2)
(1)
80
105
°C/W
Thermal resistance junction to case
R
thjc
T
j
T
stg
Junction Temperature +150 °C
Storage Temperature Range -65 to +150 °C
Human body model (HBM)
ESD
Charged device model (CDM)
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
DIP14
SO14
(2)
(1)
(4)
(3)
(5)
33
31
1200
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
TS556C
TS556I
TS556M
2/19
10
50
0 to +70
-40 to +125
-55 to +125
mA
°C
Page 3
TS556 Schematic diagram
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 diagram
Figure 1. Schematic diagram (1/2 TS556)
3/19
Page 4
Schematic diagram TS556
Output
Discharge
Ground
Trigger
Control
Voltage
Threshold
V
CC
Reset
R
R
R
B
A
R1
R
S
Q
+
-
+
-
4 / 10
5 / 9
14
2 / 12
3 / 11
6 / 8
7
1 / 13
TS556
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.
4/19
Page 5
TS556 Electrical characteristics
3 Electrical characteristics
Table 4. Static electrical characteristics
V
= +2 V, T
CC
Symbol Parameter Min. Typ. Max. Unit
= +25 °C, Reset to V
amb
(unless otherwise specified)
CC
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
130 400
1.3 1.4
0.05 0.2
Discharge pin leakage current 1 100 nA
Low level output voltage (I
OL
T
≤ T
min.
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
amb
≤ T
min.
max
0.4
0.3
1.1 1.5
Reset current 10 pA
400
1.5
0.25
0.35
1.05
2.0
µA
V
V
V
V
V
V
5/19
Page 6
Electrical characteristics TS556
Table 5. Static electrical characteristics
V
= +3 V, T
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
≤ T
amb
≤ T
max
min
Discharge saturation voltage (I
DIS
T
≤ T
amb
≤ T
max
min
= 1 mA)
dis
1.8
1.7
180 460
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
460
2.3
0.25
0.35
1.2
2.0
µA
V
V
V
V
V
V
6/19
Page 7
TS556 Electrical characteristics
Table 6. Dynamic electrical characteristics
V
= +3 V, T
CC
Symbol Parameter Min. Typ. Max. Unit
Timing accuracy (monostable)
R = 10 kΩ, C = 0.1 µF VCC=+2 V,
Timing shift with supply voltage variations
(Monostable)
(1)
R = 10 kΩ, C = 0.1 µF, VCC = +3 V ±0.3 V 0.5 %/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
=+3V
max
V
CC
(1)
(2)
1
75 ppm/°C
2MHz
(2)
%
Timing shift with supply voltage variations
(astable mode)
RA = RB = 10 kΩ, C = 0.1 µF, VCC = +3 to +5 V 0.5 %/V
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
(2)
= 10 pF) 25 ns
load
= 10 pF) 20 - ns
load
= +3 V) 350 ns
trig
7/19
Page 8
Electrical characteristics TS556
Table 7. Static electrical characteristics
V
= +5 V, T
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
≤ T
amb
≤ T
max
min.
Discharge saturation voltage (I
DIS
T
≤ T
amb
≤ T
max
min.
= 10 mA)
dis
2.9
2.8
220 500
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
500
3.9
0.35
0.8
2.06
2.0
µA
V
V
V
V
V
V
8/19
Page 9
TS556 Electrical characteristics
Table 8. Dynamic electrical characteristics
V
= +5 V, T
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)
R = 10 kΩ, C = 0.1 µF, VCC = +5 V ±1 V 0.38 %/V
Timing shift with temperature
T
min.
f
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 3 %
Timing shift with supply voltage variations
(astable mode)
RA = RB = 1 kΩ to 100 kΩ, C = 0.1 µF,
V
CC
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)
≤ T
≤ T
amb
max
(2)
= +5 to +12 V
(1)
75 ppm/°C
(2)
2.7 MHz
(2)
0.1 %/V
= 10 pF) 25 ns
load
= 10 pF) 20 - ns
load
= +5 V) 350 ns
trig
9/19
Page 10
Electrical characteristics TS556
Table 9. Static electrical characteristics
V
= +12 V, T
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
≤ T
amb
≤ T
max
min.
Control voltage level
CL
T
≤ T
≤ T
≤ T
≤ T
amb
amb
amb
amb
≤ T
≤ T
≤ T
≤ T
max
max
max
max
sink
source
= 80 mA)
dis
= 50 mA)
= -10 mA)
min.
Discharge saturation voltage (I
DIS
T
min.
Discharge pin leakage current 1 100 nA
DIS
Low level output voltage (I
OL
T
min.
High level output voltage (I
OH
T
min.
Trigger voltage
TRIG
T
min.
≤ T
amb
≤ T
max
Trigger current 10 pA
I
Threshold current 10 pA
TH
Reset voltage
≤ T
T
min.
amb
≤ T
max
Reset current 10 pA
V
= +12 V, T
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
340 800
800
88.6
8.7
0.09 1.6
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
(1)
4%
Timing shift with supply voltage variations
(monostable)
R = 10 kΩ, C = 0.1 µF, V
= +5 V ±1 V 0.38 %/V
CC
Timing shift with temperature
T
≤ T
f
max
amb
≤ T
max., VCC
min.
Maximum astable frequency
RA = 470 Ω, RB = 200 Ω, C = 200 pF, VCC = +5 V 2.7 MHz
Astable frequency accuracy
RA = RB = 1 kΩ to 100 kΩ, C = 0.1 µF
= +5 V 75 ppm/°C
(2)
3%
µA
V
V
V
V
V
V
Timing shift with supply voltage variations
(astable mode)
RA = RB = 1 kΩ to 100 kΩ, C = 0.1 µF,
VCC = 5 to +12 V
1. See Figure 4.
2. See Figure 6.
10/19
0.1 %/V
Page 11
TS556 Electrical characteristics
CC
SUPPLY VOLTAGE, V (V)
CC
SUPPLY CU RRENT, I ( A)
μ
300
200
100
0 4 8 12 16
Figure 3. Supply current (per timer) versus supply voltage
11/19
Page 12
Application information TS556
4 Application information
4.1 Monostable operation
In the monostable mode, the timer operates like a one-shot generator. Referring to figure 2,
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
1/2
TS556
Out
C
Control Voltage
μ
0.01 F
The circuit triggers on a negative-going input signal when the level reaches 1/3 V
. 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.
It can be noticed that since the charge rate and the 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 now 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 possible or 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
12/19
μ
Ω
Ω
L
Page 13
TS556 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 multivibrator. The external capacitor charges through R
discharges through R
only. Thus the duty cycle may be precisely set by the ratio of these
B
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
A
R
Out
Control
Voltage
0.01 F
1/2
TS556
μ
R
B
C
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
and 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
13/19
μ
ΩΩ
L
Page 14
Package information TS556
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
.
14/19
Page 15
TS556 Package information
5.1 DIP14 package information
Figure 8. DIP14 package mechanical drawing
Table 11. DIP14 package mechanical data
Dimensions
Millimeters Inches
Ref.
Min. Typ. Max. Min. Typ. Max.
A5.330.21
A1 0.38 0.015
A2 2.92 3.30 4.95 0.11 0.13 0.19
b 0.36 0.46 0.56 0.014 0.018 0.022
b2 1.14 1.52 1.78 0.04 0.06 0.07
c 0.20 0.25 0.36 0.007 0.009 0.01
D 18.67 19.05 19.69 0.73 0.75 0.77
E 7.62 7.87 8.26 0.30 0.31 0.32
E1 6.10 6.35 7.11 0.24 0.25 0.28
e2.54 0.10
e1 15.24 0.60
eA 7.62 0.30
eB 10.92 0.43
L 2.92 3.30 3.81 0.11 0.13 0.15
Note: D and E1 dimensions do not include mold flash or protrusions. Mold flash or protrusions
shall not exceed 0.25 mm.
15/19
Page 16
Package information TS556
5.2 SO-14 package information
Figure 9. SO-14 package mechanical drawing
Table 12. SO-14 package mechanical data
Dimensions
Millimeters Inches
Ref.
Min. Typ. Max. Min. Typ. Max.
A 1.35 1.75 0.05 0.068
A1 0.10 0.25 0.004 0.009
A2 1.10 1.65 0.04 0.06
B 0.33 0.51 0.01 0.02
C 0.19 0.25 0.007 0.009
D 8.55 8.75 0.33 0.34
E 3.80 4.0 0.15 0.15
e1.27 0.05
H 5.80 6.20 0.22 0.24
h 0.25 0.50 0.009 0.02
L 0.40 1.27 0.015 0.05
k 8° (max.)
ddd 0.10 0.004
Note: D and F dimensions do not include mold flash or protrusions. Mold flash or protrusions must
not exceed 0.15 mm.
16/19
Page 17
TS556 Ordering information
6 Ordering information
Table 13. Order codes
Order code Temperature range Package Packaging Marking
TS556CN
TS556CD
TS556CDT
TS556IN
TS556ID
TS556IDT
TS556MN
TS556MD
TS556MDT
0°C, +70°C
-40°C, +125°C
-55°C, +125°C
DIP14 Tube TS556CN
SO-14
DIP14 Tube TS556IN
SO-14
DIP14 Tube TS556MN
SO-14
Tube or
Tape & reel
Tube or
Tape & reel
Tube or
Tape & reel
556C
556I
556M
17/19
Page 18
Revision history TS556
7 Revision history
Table 14. Document revision history
Date Revision Changes
01-Feb-2003 1 Initial release.
Document reformatted.
Added output current, ESD and thermal resistance values in
28-Oct-2008 2
Table 1: Absolute maximum ratings.
Added output current values in Table 2: Operating conditions.
Updated Section 5.1: DIP14 package information and
Section 5.2: SO-14 package information.
18/19
Page 19
TS556
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