LMC555
CMOS Timer
General Description
The LMC555 is a CMOS version of the industry standard
555 series general purpose timers. In addition to the stan-
dard package (SOIC, MSOP, and MDIP) the LMC555 is also
available in a chip sized package (8 Bump micro SMD) using
National’s micro SMD package technology. The LMC555
offers the same capability of generating accurate time delays
and frequencies as the LM555 but with much lower power
dissipation and supply current spikes. When operated as a
one-shot, the time delay is precisely controlled by a single
external resistor and capacitor. In the stable mode the oscil-
lation frequency and duty cycle are accurately set by two
external resistors and one capacitor. The use of National
Semiconductor’s LMCMOS™process extends both the fre-
quency range and low supply capability.
Features
nLess than 1 mW typical power dissipation at 5V supply
n3 MHz astable frequency capability
n1.5V supply operating voltage guaranteed
nOutput fully compatible with TTL and CMOS logic at 5V
supply
nTested to −10 mA, +50 mA output current levels
nReduced supply current spikes during output transitions
nExtremely low reset, trigger, and threshold currents
nExcellent temperature stability
nPin-for-pin compatible with 555 series of timers
nAvailable in 8-pin MSOP Package and 8-Bump micro
SMD package
Pulse Width Modulator
00866920
00866915
Ordering Information
Package Temperature Range Package Marking Transport Media NSC Drawing
Industrial
−40˚C to +85˚C
8-Pin Small Outline (SO) LMC555CM LMC555CM Rails M08A
LMC555CMX 2.5k Units Tape and Reel
8-Pin Mini Small Outline
(MSOP)
LMC555CMM ZC5 1k Units Tape and Reel MUA08A
LMC555CMMX 3.5k Units Tape and Reel
8-Pin Molded Dip (MDIP) LMC555CN LMC555CN Rails N08E
8-Bump micro SMD LMC555CBP F1 250 Units Tape and Reel BPA08EFB
LMC555CBPX 3k Units Tape and Reel
8-Bump micro SMD
NOPB
LMC555CTP F02 250 Units Tape and Reel TPA08EFA
LMC555CTPX 3k Units Tape and Reel
Note: See Mil-datasheet MNLMC555-X for specifications on the military device LMC555J/883.
LMCMOS™is a trademark of National Semiconductor Corp.
May 2006
LMC555 CMOS Timer
© 2006 National Semiconductor Corporation DS008669 www.national.com
Connection Diagrams
8-Pin SOIC, MSOP, MDIP
00866901
Top View
8-Bump micro SMD
00866909
Top View
(Bump Side Down)
LMC555
www.national.com 2
Absolute Maximum Ratings (Notes 2, 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, V
+
15V
Input Voltages, V
TRIG
,V
RES
,V
CTRL
,
V
THRESH
−0.3V to V
S
+ 0.3V
Output Voltages, V
O
,V
DIS
15V
Output Current I
O
,I
DIS
100 mA
Storage Temperature Range −65˚C to +150˚C
Soldering Information
MDIP Soldering (10 seconds) 260˚C
SOIC, MSOP Vapor Phase (60 sec) 215˚C
SOIC, MSOP Infrared (15 sec) 220˚C
Note: See AN-450 “Surface Mounting Methods and Their Effect on Product
Reliability” for other methods of soldering surface mount devices.
Operating Ratings(Notes 2, 3)
Termperature
Range −40˚C to +85˚C
Thermal Resistance (θ
JA
) (Note 2)
SO, 8-Pin Small
Outline 169˚C/W
MSOP, 8-Pin
Mini Small
Outline 225˚C/W
MDIP, 8-Pin
Molded Dip 111˚C/W
8-Bump micro
SMD 220˚C/W
Maximum
Allowable Power
Dissipation @25˚C
MDIP-8 1126 mW
SO-8 740 mW
MSOP-8 555 mW
8 Bump micro
SMD 568 mW
Electrical Characteristics (Notes 1, 2)
Test Circuit, T = 25˚C, all switches open, RESET to V
S
unless otherwise noted
Symbol Parameter Conditions Min Typ Max Units
(Limits)
I
S
Supply Current V
S
= 1.5V
V
S
=5V
V
S
= 12V
50
100
150
150
250
400
µA
V
CTRL
Control Voltage V
S
= 1.5V
V
S
=5V
V
S
= 12V
0.8
2.9
7.4
1.0
3.3
8.0
1.2
3.8
8.6
V
V
DIS
Discharge Saturation Voltage V
S
= 1.5V, I
DIS
=1mA
V
S
= 5V, I
DIS
=10mA
75
150
150
300 mV
V
OL
Output Voltage (Low) V
S
= 1.5V, I
O
=1mA
V
S
= 5V, I
O
=8mA
V
S
= 12V, I
O
=50mA
0.2
0.3
1.0
0.4
0.6
2.0
V
V
OH
Output Voltage
(High)
V
S
= 1.5V, I
O
= −0.25 mA
V
S
= 5V, I
O
=−2mA
V
S
= 12V, I
O
= −10 mA
1.0
4.4
10.5
1.25
4.7
11.3
V
V
TRIG
Trigger Voltage V
S
= 1.5V
V
S
= 12V
0.4
3.7
0.5
4.0
0.6
4.3 V
I
TRIG
Trigger Current V
S
=5V 10 pA
V
RES
Reset Voltage V
S
= 1.5V (Note 4)
V
S
= 12V
0.4
0.4
0.7
0.75
1.0
1.1 V
I
RES
Reset Current V
S
=5V 10 pA
I
THRESH
Threshold Current V
S
=5V 10 pA
I
DIS
Discharge Leakage V
S
= 12V 1.0 100 nA
t Timing Accuracy SW 2, 4 Closed
V
S
= 1.5V
V
S
=5V
V
S
= 12V
0.9
1.0
1.0
1.1
1.1
1.1
1.25
1.20
1.25
ms
∆t/∆V
S
Timing Shift with Supply V
S
=5V±1V 0.3 %/V
LMC555
www.national.com3
Electrical Characteristics (Notes 1, 2)
Test Circuit, T = 25˚C, all switches open, RESET to V
S
unless otherwise noted (Continued)
Symbol Parameter Conditions Min Typ Max Units
(Limits)
∆t/∆T Timing Shift with
Temperature
V
S
=5V
−40˚C ≤T≤+85˚C
75 ppm/˚C
f
A
Astable Frequency SW 1, 3 Closed, V
S
= 12V 4.0 4.8 5.6 kHz
f
MAX
Maximum Frequency Max. Freq. Test Circuit, V
S
= 5V 3.0 MHz
t
R
,t
F
Output Rise and
Fall Times
Max. Freq. Test Circuit
V
S
= 5V, C
L
=10pF
15 ns
t
PD
Trigger Propagation Delay V
S
= 5V, Measure Delay
from Trigger to Output 100 ns
Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 3: See AN-450 for other methods of soldering surface mount devices, and also AN-1112 for micro SMD considerations.
Note 4: If the RESET pin is to be used at temperatures of −20˚C and below VSis required to be 2.0V or greater.
Note 5: For device pinout please refer to table 1
Test Circuit (Note 5)
00866902
Maximum Frequency Test Circuit (Note 5)
00866903
TABLE 1. Package Pinout Names vs. Pin Function
Pin Function Package Pin numbers
8-Pin SO, MSOP, and MDIP 8-Bump micro SMD
GND 1 A3
Trigger 2B3
Output 3 C3
Reset 4C2
Control Voltage 5 C1
Threshold 6 B1
Discharge 7 A1
V
+
8A2
LMC555
www.national.com 4
Application Information
MONOSTABLE OPERATION
In this mode of operation, the timer functions as a one-shot
(Figure 1). The external capacitor is initially held discharged
by internal circuitry. Upon application of a negative trigger
pulse of less than 1/3 V
S
to the Trigger terminal, the flip-flop
is set which both releases the short circuit across the capaci-
tor and drives the output high.
The voltage across the capacitor then increases exponen-
tially for a period of t
H
= 1.1 R
A
C, which is also the time that
the output stays high, at the end of which time the voltage
equals 2/3 V
S
. The comparator then resets the flip-flop which
in turn discharges the capacitor and drives the output to its
low state. Figure 2 shows the waveforms generated in this
mode of operation. Since the charge and the threshold level
of the comparator are both directly proportional to supply
voltage, the timing internal is independent of supply.
Reset overrides Trigger, which can override threshold.
Therefore the trigger pulse must be shorter than the desired
t
H
. The minimum pulse width for the Trigger is 20ns, and it is
400ns for the Reset. During the timing cycle when the output
is high, the further application of a trigger pulse will not effect
the circuit so long as the trigger input is returned high at least
10µs before the end of the timing interval. However the
circuit can be reset during this time by the application of a
negative pulse to the reset terminal. The output will then
remain in the low state until a trigger pulse is again applied.
When the reset function is not use, it is recommended that it
be connected to V
+
to avoid any possibility of false triggering.
Figure 3 is a nomograph for easy determination of RC values
for various time delays.
Note: In monstable operation, the trigger should be driven high before the
end of timing cycle.
ASTABLE OPERATION
If the circuit is connected as shown in Figure 4 (Trigger and
Threshold terminals connected together) it will trigger itself
and free run as a multivibrator. The external capacitor
charges through R
A
+R
B
and discharges through R
B
. Thus
the duty cycle may be precisely set by the ratio of these two
resistors.
In this mode of operation, the capacitor charges and dis-
charges between 1/3 V
S
and 2/3 V
S
. As in the triggered
mode, the charge and discharge times, and therefore the
frequency are independent of the supply voltage.
Figure 5 shows the waveform generated in this mode of
operation.
00866904
FIGURE 1. Monostable (One-Shot)
00866910
VCC = 5V Top Trace: Input 5 V/Div.
TIME = 0.1 ms/Div. Middle Trace: Output 5 V/Div.
RA= 9.1 kΩBottom Trace: Capacitor Voltage 2 V/Div.
C = 0.01 µF
FIGURE 2. Monostable Waveforms
00866911
FIGURE 3. Time Delay
00866905
FIGURE 4. Astable (Variable Duty Cycle Oscillator)
LMC555
www.national.com5
Application Information (Continued)
The charge time (output high) is given by
t
1
= 0.693 (R
A
+R
B
)C
And the discharge time (output low) by:
t
2
= 0.693 (R
B
)C
Thus the total period is:
T=t
1
+t
2
= 0.693 (R
A
+R
B
)C
The frequency of oscillation is:
Figure 6 may be used for quick determination of these RC
Values. The duty cycle, as a fraction of total period that the
output is low, is:
FREQUENCY DIVIDER
The monostable circuit of Figure 1 can be used as a fre-
quency divider by adjusting the length of the timing cycle.
Figure 7 shows the waveforms generated in a divide by three
circuit.
PULSE WIDTH MODULATOR
When the timer is connected in the monostable mode and
triggered with a continuous pulse train, the output pulse
width can be modulated by a signal applied to the Control
Voltage Terminal. Figure 8 shows the circuit, and in Figure 9
are some waveform examples.
00866912
VCC = 5V Top Trace: Output 5 V/Div.
TIME = 20 µs/Div. Bottom Trace: Capacitor Voltage 1 V/Div.
RA= 3.9 kΩ
RB=9kΩ
C = 0.01 µF
FIGURE 5. Astable Waveforms
00866913
FIGURE 6. Free Running Frequency
00866914
VCC = 5V Top Trace: Input 4 V/Div.
TIME = 20 µs/Div. Middle Trace: Output 2 V/Div.
RA= 9.1 kΩBottom Trace: Capacitor 2 V/Div.
C = 0.01 µF
FIGURE 7. Frequency Divider Waveforms
00866920
FIGURE 8. Pulse Width Modulator
LMC555
www.national.com 6
Application Information (Continued)
PULSE POSITION MODULATOR
This application uses the timer connected for astable opera-
tion, as in Figure 10, with a modulating signal again applied
to the control voltage terminal. The pulse position varies with
the modulating signal, since the threshold voltage and hence
the time delay is varied. Figure 11 shows the waveforms
generated for a triangle wave modulation signal.
50% DUTY CYCLE OSCILLATOR
The frequency of oscillation is
f = 1/(1.4 R
C
C)
micro SMD Marking Orientation
Top View
00866923
Bumps are numbered counter-clockwise
00866915
VCC = 5V Top Trace: Modulation 1 V/Div.
TIME = 0.2 ms/Div. Bottom Trace: Output Voltage 2 V/Div.
RA= 9.1 kΩ
C = 0.01 µF
FIGURE 9. Pulse Width Modulator Waveforms
00866921
FIGURE 10. Pulse Position Modulator
00866916
VCC = 5V Top Trace: Modulation Input 1 V/Div.
TIME = 0.1 ms/Div. Bottom Trace: Output Voltage 2 V/Div.
RA= 3.9 kΩ
RB=3kΩ
C = 0.01 µF
FIGURE 11. Pulse Position Modulator Waveforms
00866906
FIGURE 12. 50% Duty Cycle Oscillator
LMC555
www.national.com7
Physical Dimensions inches (millimeters) unless otherwise noted
Molded Small Outline (SO) Package (M)
NS Package Number M08A
8-Pin (0.118” Wide) Molded Mini Small Outline Package
NS Package Number MUA08A
LMC555
www.national.com 8
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Dual-in-line Package (N)
NS Package Number N08E
LMC555
www.national.com9
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NOTES: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING
2. 63Sn/37Pb EUTECTIC BUMP
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED
COUNTERCLOCKWISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS
PACKAGE HEIGHT.
6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BC.
8-Bump micro SMD Package
NS Package Number BPA08EFB
X
1
= 1.387 X
2
= 1.412 X
3
= 0.850
LMC555
www.national.com 10
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NOTES: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING
2. FOR SOLDER BUMP COMPOSITION, SEE “SOLDER INFORMATION” IN THE PACKAGING SECTION OF THE NATIONAL SEMICONDUCTOR WEB
PAGE (www.national.com).
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS
PACKAGE HEIGHT.
6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BC.
8-Bump micro SMD Package
NS Package Number TPA08EFA
X
1
= 1.387 X
2
= 1.412 X
3
= 0.500
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
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National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances
and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at:
www.national.com/quality/green.
Lead free products are RoHS compliant.
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LMC555 CMOS Timer
Tel: 81-3-5639-7560www.national.com
LMC555 CMOS Timer
Features
• Less than 1 mW typical power dissipation at 5V supply
• 3 MHz astable frequency capability
• 1.5V supply operating voltage guaranteed
• Output fully compatible with TTL and CMOS logic at 5V supply
• Tested to -10 mA, +50 mA output current levels
• Reduced supply current spikes during output transitions
• Extremely low reset, trigger, and threshold currents
• Excellent temperature stability
• Pin-for-pin compatible with 555 series of timers
• Available in 8-pin MSOP Package and 8-Bump micro SMD package
General Description
The LMC555 is a CMOS version of the industry standard 555 series general purpose
timers. More...
Typical Application
See Datasheet for Application Information
Parametric Table expand
Temperature Min -40 deg C
Temperature Max 85 deg C
Additional Resources
Design Tools (see below)
Connection Diagram
click for larger image
Datasheet
RoHS Compliance Information Size in Kbytes Date
LMC555 CMOS Timer 767 Kbytes 25-May-06 View Online
Download
LMC555 CMOS Timer (Japanese)513 Kbytes
LMC555 Mil-Aero Datasheet MNLMC555-X 160 Kbytes Download
If you have trouble printing or viewing PDF file(s), see Printing Problems.
Package Availability, Models, Samples & Pricing
Part Number Package Factory Lead Time Models Samples &
Electronic
Orders
Budgetary Pricing Std
Pack
Size
Package
Marking
Format
Type Pins Spec. MSL
Rating Peak
Reflow RoHS
Report CAD
Symbols Weeks Qty Qty $US each
LMC555CBPX MICRO SMD 8 STD 1 260 RoHS N/A Lifetime buy N/A
1K+ $0.48 reel
of
3000
XVF
I 1
12 weeks 15000
LMC555CM SOIC NARROW 8
STD
NOPB
1
1
235
260
RoHS N/A Full production N/A 1K+ $0.43 rail
of
95
NSZXTT
LMC
555CM
6 weeks 5000
LMC555CMX SOIC NARROW 8
STD
NOPB
1
1
235
260
RoHS N/A Full production N/A
1K+ $0.43 reel
of
2500
NSZXTT
LMC
555CM
6 weeks 5000
LMC555CMM MINI SOIC 8
STD
NOPB
1
1
260
260
RoHS N/A Full production N/A 1K+ $0.50 reel
of
1000
ZXTT
ZC5
8 weeks 5000
LMC555CMMX MINI SOIC 8
STD
NOPB
1
1
260
260
RoHS N/A Full production N/A
1K+ $0.50 reel
of
3500
ZXTT
ZC5
8 weeks 7500
LMC555CN MDIP 8
STD
NOPB
1
1
NA
NA
RoHS N/A Full production N/A 1K+ $0.54 rail
of
40
NSUZXYTT
LMC
555CN
6 weeks 3000
LMC555CTP MICRO SMD 8 NOPB 1 260 RoHS N/A Full production N/A 1K+ $0.59 reel
of
250
XVF
I 02
6 weeks N/A
LMC555CTPX MICRO SMD 8 NOPB 1 260 RoHS N/A Full production N/A
1K+ $0.59 reel
of
3000
XVF
I 02
6 weeks N/A
LMC555 MDA Unpackaged Die Full production N/A CALL tray
of
N/A -
N/A N/A
LMC555 MD8 Unpackaged Die Full production N/A CALL tray
of
N/A -
N/A N/A
5962-8950305PA
(LMC555J/883) CERDIP 8RoHS N/A Obsolete N/A
50+ $11.70 rail
of
40
NSZSSXXYYA
LMC555J/883
Q 5962-
8950305PA
8 weeks 500
Obsolete Parts
Obsolete Part Alternate Part or Supplier Source Last Time Buy Date
LMC555CBP NONE NONE 07/24/2009
LMC555CBPX NONE NONE 07/24/2009
LMC555G-R DWF NONE NONE 04/04/95
LMC555H/883 LMC555J/883 NATIONAL SEMICONDUCTOR 09/08/98
LMC555J/883 LM555J/883 NONE 12/03/2008
General Description
The LMC555 is a CMOS version of the industry standard 555 series general purpose timers. In addition to the standard package (SOIC, MSOP, and MDIP) the LMC555 is also available in
a chip sized package (8 Bump micro SMD) using National's micro SMD package technology. The LMC555 offers the same capability of generating accurate time delays and frequencies as
the LM555 but with much lower power dissipation and supply current spikes. When operated as a one-shot, the time delay is precisely controlled by a single external resistor and capacitor.
In the stable mode the oscillation frequency and duty cycle are accurately set by two external resistors and one capacitor. The use of National Semiconductor's LMCMOS™ process
extends both the frequency range and low supply capability.
Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM * LTA Rejects LTA Device Hours FITS MTTF (Hours)
LMC555 MD8 CMOS 0 16925 0 0 2065000 2 585949388
LMC555 MDA P2CMOS 0 45010 0 1 3767500 3 484371054
LMC555CBPX P2CMOS 0 45010 0 1 3767500 3 484371054
LMC555CM P2CMOS 0 45010 0 1 3767500 3 484371054
LMC555CMM P2CMOS 0 45010 0 1 3767500 3 484371054
LMC555CMMX P2CMOS 0 45010 0 1 3767500 3 484371054
LMC555CMX P2CMOS 0 45010 0 1 3767500 3 484371054
LMC555CN P2CMOS 0 45010 0 1 3767500 3 484371054
LMC555CTP P2CMOS 0 45010 0 1 3767500 3 484371054
LMC555CTPX P2CMOS 0 45010 0 1 3767500 3 484371054
LMC555J/883 CMOS 0 16925 0 0 2065000 2 585949388
Note: The Early Failure Rates were calculated as point estimates. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy
and derating the assumed stress temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
Design Tools
Title Size in Kbytes Date
LMC555CBP Micro SMD Qualification Package 4172 Kbytes 17-Apr-2000 View Online Download
If you have trouble printing or viewing PDF file(s), see Printing Problems.
Application Notes
Title Size in Kbytes Date
AN-828: Application Note 828 Increasing the High Speed Torque of Bipolar Stepper Motors 808 Kbytes 1-Oct-02 Download
AN-828 (Japanese): Application Note 828 Increasing the High Speed Torque of Bipolar Stepper Motors 362 Kbytes
AN-681: PC Mouse Implementation Using COP800 525 Kbytes 5-Aug-95 Download
AN-460: Application Note 460 LM34/LM35 Precision Monolithic Temperature Sensors 306 Kbytes 20-Sep-02 Download
AN-460 (Japanese): Application Note 460 LM34/LM35 Precision Monolithic Temperature Sensors 322 Kbytes
If you have trouble printing or viewing PDF file(s), see Printing Problems.
[Information as of 22-Dec-2008]
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