LMC555 LMC555 CMOS Timer Literature Number: SNAS558H LMC555 CMOS Timer General Description Features 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 LMCMOSTM process extends both the frequency range and low supply capability. 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 Pulse Width Modulator 866915 866920 Ordering Information Package Temperature Range Package Marking Transport Media NSC Drawing Industrial -40C to +85C 8-Pin Small Outline (SO) LMC555CM LMC555CMX 8-Pin Mini Small Outline (MSOP) LMC555CMM LMC555CMMX 8-Pin Molded Dip (MDIP) LMC555CN 8-Bump micro SMD NOPB LMC555CTP LMC555CTPX LMC555CM ZC5 Rails 2.5k Units Tape and Reel 1k Units Tape and Reel 3.5k Units Tape and Reel LMC555CN F02 Rails 250 Units Tape and Reel 3k Units Tape and Reel M08A MUA08A N08E TPA08FGA Note: See Mil-datasheet MNLMC555-X for specifications on the military device LMC555J/883. LMCMOSTM is a trademark of National Semiconductor Corp. (c) 2010 National Semiconductor Corporation 8669 www.national.com LMC555 CMOS Timer November 8, 2010 LMC555 Connection Diagrams 8-Pin SOIC, MSOP, MDIP 866901 Top View 8-Bump micro SMD 866909 Top View (Bump Side Down) www.national.com 2 Operating Ratings Termperature Range 3) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 2, Note 3) -40C to +85C Thermal Resistance (JA) (Note 2) SO, 8-Pin Small Outline 169C/W MSOP, 8-Pin Mini Small Outline 225C/W MDIP, 8-Pin Molded Dip 111C/W 8-Bump micro SMD 220C/W Maximum Allowable Power Dissipation @25C MDIP-8 1126 mW SO-8 740 mW MSOP-8 555 mW 8 Bump micro SMD 568 mW Supply Voltage, V+ 15V Input Voltages, VTRIG, VRES, VCTRL, VTHRESH -0.3V to VS + 0.3V Output Voltages, VO, VDIS 15V Output Current IO, IDIS 100 mA Storage Temperature Range -65C to +150C Soldering specification for MDIP package: Soldering (10 seconds) 260C Soldering specification for all other packages: see product folder at www.national.com and www.national.com/ms/MS/MS-SOLDERING.pdf Electrical Characteristics LMC555 Absolute Maximum Ratings (Note 2, Note (Note 1, Note 2) Test Circuit, T = 25C, all switches open, RESET to VS unless otherwise noted Symbol Parameter IS Supply Current VCTRL Control Voltage Conditions Min VS = 1.5V VS = 5V VS = 12V VS = 1.5V VS = 5V VS = 12V 0.8 2.9 7.4 Typ Max Units (Limits) 50 100 150 150 250 400 A 1.0 3.3 8.0 1.2 3.8 8.6 V VDIS Discharge Saturation Voltage VS = 1.5V, IDIS = 1 mA VS = 5V, IDIS = 10 mA 75 150 150 300 mV VOL Output Voltage (Low) 0.2 0.3 1.0 0.4 0.6 2.0 V VOH VS = 1.5V, IO = 1 mA VS = 5V, IO = 8 mA VS = 12V, IO = 50 mA Output Voltage (High) VS = 1.5V, IO = -0.25 mA VS = 5V, IO = -2 mA VS = 12V, IO = -10 mA 1.0 4.4 10.5 1.25 4.7 11.3 VTRIG Trigger Voltage VS = 1.5V VS = 12V 0.4 3.7 0.5 4.0 ITRIG Trigger Current VS = 5V VRES Reset Voltage VS = 1.5V (Note 4) VS = 12V IRES Reset Current VS = 5V ITHRESH Threshold Current VS = 5V 10 IDIS Discharge Leakage VS = 12V 1.0 100 t Timing Accuracy SW 2, 4 Closed VS = 1.5V VS = 5V VS = 12V 1.1 1.1 1.1 1.25 1.20 1.25 t/VS Timing Shift with Supply t/T Timing Shift with Temperature VS = 5V V 0.6 4.3 10 0.4 0.4 0.7 0.75 pA 1.0 1.1 10 0.9 1.0 1.0 VS = 5V 1V V V pA pA nA ms 0.3 %/V 75 ppm/C -40C T +85C 3 www.national.com LMC555 Conditions Min Typ Max 4.0 4.8 5.6 Units (Limits) Symbol Parameter fA Astable Frequency SW 1, 3 Closed, VS = 12V fMAX Maximum Frequency Max. Freq. Test Circuit, VS = 5V 3.0 MHz tR, tF Output Rise and Fall Times Max. Freq. Test Circuit VS = 5V, CL = 10 pF 15 ns tPD Trigger Propagation Delay VS = 5V, Measure Delay from Trigger to Output 100 ns kHz 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-1112 for micro SMD considerations. Note 4: If the RESET pin is to be used at temperatures of -20C and below VS is required to be 2.0V or greater. Note 5: For device pinout please refer to table 1 Test Circuit (Note 5) Maximum Frequency Test Circuit (Note 5) 866903 866902 TABLE 1. Package Pinout Names vs. Pin Function Pin Function 8-Pin SO, MSOP, and MDIP www.national.com Package Pin numbers 8-Bump micro SMD GND 1 Trigger 2 B3 Output 3 C3 Reset 4 C2 Control Voltage 5 C1 Threshold 6 B1 Discharge 7 A1 V+ 8 A2 4 A3 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 VS to the Trigger terminal, the flip-flop is set which both releases the short circuit across the capacitor and drives the output high. Note: In monstable operation, the trigger should be driven high before the end of timing cycle. 866904 FIGURE 1. Monostable (One-Shot) The voltage across the capacitor then increases exponentially for a period of tH = 1.1 RAC, which is also the time that the output stays high, at the end of which time the voltage equals 2/3 VS. 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. 866911 FIGURE 3. Time Delay 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 RA + RB and discharges through RB. Thus the duty cycle may be precisely set by the ratio of these two resistors. 866910 VCC = 5V TIME = 0.1 ms/Div. RA = 9.1 k C = 0.01 F Top Trace: Input 5 V/Div. Middle Trace: Output 5 V/Div. Bottom Trace: Capacitor Voltage 2 V/Div. 866905 FIGURE 2. Monostable Waveforms FIGURE 4. Astable (Variable Duty Cycle Oscillator) Reset overrides Trigger, which can override threshold. Therefore the trigger pulse must be shorter than the desired tH. 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 cir- In this mode of operation, the capacitor charges and discharges between 1/3 VS and 2/3 VS. As in the triggered mode, the charge and discharge times, and therefore the frequency are independent of the supply voltage. 5 www.national.com LMC555 cuit so long as the trigger input is returned high at least 10s 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. Application Information LMC555 Figure 5 shows the waveform generated in this mode of operation. FREQUENCY DIVIDER The monostable circuit of Figure 1 can be used as a frequency divider by adjusting the length of the timing cycle. Figure 7 shows the waveforms generated in a divide by three circuit. 866912 VCC = 5V TIME = 20 s/Div. RA = 3.9 k RB = 9 k C = 0.01 F Top Trace: Output 5 V/Div. Bottom Trace: Capacitor Voltage 1 V/Div. 866914 VCC = 5V Top Trace: Input 4 V/Div. TIME = 20 s/Div. Middle Trace: Output 2 V/Div. RA = 9.1 k Bottom Trace: Capacitor 2 V/Div. C = 0.01 F FIGURE 5. Astable Waveforms FIGURE 7. Frequency Divider Waveforms The charge time (output high) is given by 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. t1 = 0.693 (RA + RB)C And the discharge time (output low) by: t2 = 0.693 (RB)C Thus the total period is: T = t1 + t2 = 0.693 (RA + 2RB)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: 866920 FIGURE 8. Pulse Width Modulator 866913 FIGURE 6. Free Running Frequency www.national.com 6 LMC555 866916 866915 VCC = 5V TIME = 0.1 ms/Div. RA = 3.9 k RB = 3 k C = 0.01 F VCC = 5V Top Trace: Modulation 1 V/Div. TIME = 0.2 ms/Div. Bottom Trace: Output Voltage 2 V/Div. RA = 9.1 k C = 0.01 F Top Trace: Modulation Input 1 V/Div. Bottom Trace: Output Voltage 2 V/Div. FIGURE 9. Pulse Width Modulator Waveforms FIGURE 11. Pulse Position Modulator Waveforms PULSE POSITION MODULATOR This application uses the timer connected for astable operation, 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 RCC) 866906 866921 FIGURE 12. 50% Duty Cycle Oscillator FIGURE 10. Pulse Position Modulator micro SMD Marking Orientation Top View 866926 7 www.national.com LMC555 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 www.national.com 8 LMC555 Molded Dual-in-line Package (N) NS Package Number N08E 9 www.national.com LMC555 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 TPA08FGA X1 = 1.412 X2 = 1.438 X3 = 0.500 www.national.com 10 LMC555 Notes 11 www.national.com LMC555 CMOS Timer Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH(R) Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy www.national.com/powerwise Applications & Markets www.national.com/solutions Mil/Aero www.national.com/milaero PowerWise(R) Solutions Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors SolarMagicTM www.national.com/solarmagic PLL/VCO www.national.com/wireless www.national.com/training PowerWise(R) Design University THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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