LMC555 CMOS Timer General Description Features The LMC555 is a CMOS version of the industry standard 555 series general purpose timers. It offers the same capability of generating accurate time delays and frequencies 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 astable 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. n n n n n n n n n n 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 Block and Connection Diagrams DS008669-1 (Pinouts for Molded and Metal Can Packages are identical) Order Number LMC555CH, LMC555CM, LMC555CMM or LMC555CN See NS Package Number H08C, M08A, MUA08A, or N08E LMCMOS™ is a trademark of National Semiconductor Corp. © 1997 National Semiconductor Corporation DS008669 www.national.com LMC555 CMOS Timer May 1997 Absolute Maximum Ratings (Note 2) Soldering Information Dual-In-Line Package Soldering (10 seconds) 260˚C Small Outline Package (SOIC and MSOP) Vapor Phase (60 seconds) 215˚C Infrared (15 seconds) 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount devices. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage, V8 Input Voltages, V2, V4, V5, V6 Output Voltages, V3, V7 Output Current I3, I7 Operating Temperature Range (Note 4) Storage Temperature Range 15V −0.3V to VS + 0.3V 15V 100 mA −40˚C to +85˚C −65˚C to +150˚C Electrical Characteristics (Notes 1, 2) Test Circuit, T = 25˚C, all switches open, RESET to VS unless otherwise noted Symbol Parameter Conditions Min Typ Max Units (Limits) I8 V5 V7 Supply Current Control Voltage Discharge Saturation Voltage V3L Output Voltage (Low) V3H V2 VS = 1.5V VS = 5V VS = 12V VS = 1.5V VS = 5V VS = 12V (High) Trigger Voltage I2 Trigger Current V4 Reset Voltage I4 Reset Current I6 Threshold Current I7 Discharge Leakage t Timing Accuracy 150 250 150 400 0.8 1.0 1.2 2.9 3.3 3.8 7.4 8.0 8.6 VS = 1.5V, I7 = 1 mA VS = 5V, I7 = 10 mA VS = 1.5V, I3 = 1 mA VS = 5V, I3 = 8 mA VS = 12V, I3 = 50 mA VS = 1.5V, I3 = −0.25 mA VS = 5V, I3 = −2 mA Output Voltage 50 100 1.0 75 150 150 300 0.2 0.4 0.3 0.6 1.0 2.0 4.7 VS = 12V, I3 = −10 mA VS = 1.5V 10.5 11.3 0.4 0.5 0.6 VS = 12V VS = 5V VS = 1.5V (Note 5) VS = 12V 3.7 4.0 4.3 0.4 0.7 1.0 0.4 0.75 1.1 ∆t/∆Vs Timing Shift with Supply VS = 5V VS = 12V VS = 5V ± 1V ∆t/∆T Timing Shift with VS = 5V mV V V 10 V pA 10 V pA 10 SW 2, 4 Closed VS = 1.5V V 1.25 4.4 VS = 5V VS = 5V VS = 12V µA pA 1.0 100 nA 0.9 1.1 1.25 ms 1.0 1.1 1.20 1.0 1.1 1.25 0.3 %/V 75 ppm/˚C Temperature −40˚C ≤ T ≤ +85˚C 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 Max. Freq. Test Circuit VS = 5V, CL = 10 pF 15 ns Fall Times www.national.com 4.0 2 4.8 5.6 kHz Electrical Characteristics (Notes 1, 2) Test Circuit, T = 25˚C, all switches open, RESET to VS unless otherwise noted (Continued) Symbol Parameter Conditions Min Typ Max Units (Limits) tPD Trigger Propagation Delay VS = 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: Refer to RETSC555X drawing for specifications of military LMC555H version. Note 4: For operation at elevated temperatures, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance of 111˚C/W for the LMC555CN, 167˚C/W for the LMC555CH, 169˚C/W for the LMC555CM, and 225˚C/W for the LMC555MM. Maximum allowable dissipation at 25˚C is 1126 mW for the LMC555CN, 755 mW for the LMC555CH, 740 mW for the LMC555CM and 555 mW for the LMC555MM. Note 5: If the RESET pin is to be used at temperatures of −20˚C and below VS is required to be 2.0V or greater. Test Circuit Maximum Frequency Test Circuit DS008669-3 DS008669-2 Typical Applications Monostable (One-Shot) DS008669-4 tH = 1.1 RAC (Gives time that output is high following trigger) RESET overrides TRIGGER, which can override THRESHOLD. Therefore, the trigger pulse must be shorter than the desired tH. The minimum trigger pulse width is 20 ns. The minimum reset pulse width is 400 ns. 3 www.national.com Typical Applications (Continued) Variable Duty Cycle Oscillator DS008669-5 (Gives fraction of total period that output is low) 50% Duty Cycle Oscillator DS008669-6 www.national.com 4 5 Physical Dimensions inches (millimeters) 8-Lead TO-5 Metal Can Package (H) Order Number LMC555CH NS Package Number H08C Molded Small Outline (SO) Package (M) Order Number LMC555CM NS Package Number M08A www.national.com 6 Physical Dimensions inches (millimeters) (Continued) 8-Lead (0.118” Wide) Molded Mini Small Outline Package Order Number LMC555CMM NS Package Number MUA08A 7 www.national.com LMC555 CMOS Timer Physical Dimensions inches (millimeters) (Continued) Molded Dual-in-line Package (N) Order Number LMC555CN NS Package Number N08E LIFE SUPPORT POLICY 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 OF NATIONAL SEMICONDUCTOR CORPORATION. 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