Product Folder Sample & Buy Support & Community Tools & Software Technical Documents LM556 SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 LM556 Dual Timer 1 Features 3 Description * * * * * * * * * The LM556 dual-timing circuit is a highly-stable controller capable of producing accurate time delays or oscillation. The LM556 device is a dual-timing version of the LM555 device. Timing is provided by an external resistor and capacitor for each timing function. The two timers operate independently of each other, sharing only VCC and ground. The circuits may be triggered and reset on falling waveforms. The output structures may sink or source 200 mA. 1 Direct Replacement for SE556/NE556 Timing From Microseconds Through Hours Operates in Both Astable and Monostable Modes Replaces Two 555 Timers Adjustable Duty Cycle Output Can Source or Sink 200 mA Output and Supply TTL-Compatible Temperature Stability Better Than 0.005% per C Normally On and Normally Off Output 2 Applications * * * * * * * Precision Timing Pulse Generation Sequential Timing Time Delay Generation Pulse Width Modulation Pulse Position Modulation Linear Ramp Generator Device Information(1) PART NUMBER LM556 PACKAGE BODY SIZE (NOM) SOIC (14) 3.91 mm x 8.65 mm PDIP (14) 6.35 mm x 19.177 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Schematic Diagram 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LM556 SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 www.ti.com Table of Contents 1 2 3 4 5 6 7 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 4 6.1 6.2 6.3 6.4 6.5 6.6 4 4 4 4 5 6 Absolute Maximum Ratings ...................................... ESD Ratings.............................................................. Recommended Operating Conditions....................... Thermal Information .................................................. Electrical Characteristics........................................... Typical Characteristics .............................................. Detailed Description .............................................. 8 7.1 Overview ................................................................... 8 7.2 Functional Block Diagram ......................................... 8 7.3 Feature Description................................................... 8 7.4 Device Functional Modes.......................................... 8 8 Application and Implementation ........................ 10 8.1 Application Information............................................ 10 8.2 Typical Application ................................................. 10 9 Power Supply Recommendations...................... 12 10 Layout................................................................... 12 10.1 Layout Guidelines ................................................. 12 10.2 Layout Example .................................................... 12 11 Device and Documentation Support ................. 13 11.1 11.2 11.3 11.4 11.5 Documentation Support ........................................ Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 13 13 13 13 13 12 Mechanical, Packaging, and Orderable Information ........................................................... 13 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Original (March 2000) to Revision A Page * Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section. ................................................................................................ 1 * Deleted the VCC = 5 V and ISINK = 8 mA test condition row for the Output voltage drop parameter in the Electrical Characteristics table ............................................................................................................................................................... 5 2 Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 LM556 www.ti.com SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 5 Pin Configuration and Functions D or NFF Package 14-Pin SOIC or PDIP Top View DISCHARGE 1 14 VCC THRESHOLD 2 13 DISCHARGE CTRL VOLTAGE 3 12 THRESHOLD RESET 4 11 CTRL VOLTAGE OUTPUT 5 10 RESET TRIGGER 6 9 OUTPUT GND 7 8 TRIGGER Pin Functions PIN NAME NO. I/O DESCRIPTION CONTROL VOLTAGE (Timer 0) 3 I Controls the threshold and trigger levels. It determines the pulse width of the output waveform. An external voltage applied to this pin can also be used to modulate the output waveform. CONTROL VOLTAGE (Timer 1) 11 I Controls the threshold and trigger levels. It determines the pulse width of the output waveform. An external voltage applied to this pin can also be used to modulate the output waveform. DISCHARGE (Timer 0) 1 I Open collector output which discharges a capacitor between intervals (in phase with output). It toggles the output from high to low when voltage reaches 2/3 of supply voltage. DISCHARGE (Timer 1) 13 I Open collector output which discharges a capacitor between intervals (in phase with output). It toggles the output from high to low when voltage reaches 2/3 of supply voltage. GND 7 O Ground reference voltage OUTPUT (Timer 0) 5 O Output driven waveform OUTPUT (Timer 1) 9 O Output driven waveform RESET (Timer 0) 4 I Negative pulse applied to this pin to disable or reset the timer. When not used for reset purposes, it should be connected to Vcc to avoid false triggering. RESET (Timer 1) 10 I Negative pulse applied to this pin to disable or reset the timer. When not used for reset purposes, it should be connected to Vcc to avoid false triggering. THRESHOLD (Timer 0) 2 I Compares the voltage applied to the terminal with a reference voltage of 2/3 VCC. The amplitude of voltage applied to this terminal is responsible for the set state of the flip-flop. TRIGGER (Timer 0) 6 I Responsible for transition of the flip-flop from set to reset. The output of the timer depends on the amplitude of the external trigger pulse applied to this pin. THRESHOLD (Timer 1) 12 I Compares the voltage applied to the terminal with a reference voltage of 2/3 VCC. The amplitude of voltage applied to this terminal is responsible for the set state of the flip-flop. TRIGGER (Timer 1) 8 I Responsible for transition of the flip-flop from set to reset. The output of the timer depends on the amplitude of the external trigger pulse applied to this pin. VCC 14 I Supply voltage with respect to GND Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 3 LM556 SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) (2) MIN Supply voltage Power dissipation (3) (2) (3) V 410 LM556CN 1620 0 mW 70 C PDIP package soldering (10 seconds) 260 SOIC package vapor phase (60 seconds) 215 SOIC package infrared (15 seconds) 220 Storage temperature, Tstg (1) UNIT 18 LM556CM Operating temperature, LM556C Soldering information MAX -65 C 150 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. For operating at elevated temperatures the device must be derated based on a 150C maximum junction temperature and a thermal resistance of 77C/W (Plastic Dip), and 110C/W (SO-14 Narrow). 6.2 ESD Ratings V(ESD) (1) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) VALUE UNIT 500 V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. 6.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) VCC Supply voltage TA Operating temperature MIN MAX UNIT 4.5 16 V 0 70 C 6.4 Thermal Information LM556 THERMAL METRIC (1) D (SOIC) NFF (PDIP) UNIT 14 PINS 14 PINS RJA Junction-to-ambient thermal resistance 85.3 48.0 C/W RJC(top) Junction-to-case (top) thermal resistance 45.8 34.9 C/W RJB Junction-to-board thermal resistance 39.6 27.9 C/W JT Junction-to-top characterization parameter 11.7 19.3 C/W JB Junction-to-board characterization parameter 39.4 27.8 C/W RJC(bot) Junction-to-case (bottom) thermal resistance -- -- C/W (1) 4 For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 LM556 www.ti.com SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 6.5 Electrical Characteristics TA = 25C, VCC = 5 V to 15 V, unless otherwise specified PARAMETER TEST CONDITIONS Supply voltage MIN Supply current (each timer section) VCC = 5 V, RL = VCC = 15 V, RL = (low state) (1) Initial accuracy Timing error, monostable Drift with temperature Accuracy over temperature Accuracy over temperature 6 10 14 0.30 5 5.5 VCC = 5 V 1.25 1.67 2 0.2 1 0.5 1 0.1 0.6 mA 0.1 A 250 nA 0.03 VTH = 11.2 V VCC = 15 V VCC = 5 V 9 10 11 2.6 3.33 4 1 100 VCC = 15 V, I = 15 mA 180 300 VCC = 4.5 V, I = 4.5 mA 80 200 ISINK = 10 mA 0.1 0.25 ISINK = 50 mA 0.4 0.75 ISINK = 100 mA 2 2.75 ISINK = 200 mA 2.5 VCC = 15 V VCC = 5 V, ISINK = 5 mA 0.25 ISOURCE = 200 mA, VCC = 15 V 12.5 ISOURCE = 100 mA, VCC = 15 V VCC = 5 V 12.75 2.75 Fall time of output 100 0.1% See (5) Drift with supply voltage (1) (2) (3) (4) (5) A V V nA mV V 0.35 V 3.3 100 Initial timing accuracy V 13.3 Rise time of output Timing drift with temperature %/V 4.5 Pin 1, 13 leakage output high Matching characteristics ppm/C VCC = 15 V VTH = V-control (3) Output voltage drop (high) %/V 3% Reset current Output voltage drop (low) ppm/C 150 RA, RB = 1 k to 100 k, C = 0.1 F (2) 0.4 Pin 1, 13 sat output low (4) mA 0.1 Reset voltage Control voltage level and threshold voltage V 2.25% Trigger current Threshold current 3 1.5% Drift with supply Trigger voltage UNIT 16 50 RA = 1 k to 100 k, C = 0.1 F (2) Initial accuracy Drift with temperature MAX 0.75% Drift with supply Timing error, astable TYP 4.5 ns ns 2% 10 0.2 ppm/C 0.5 %/V Supply current when output high typically 1 mA less at VCC = 5 V. Tested at VCC = 5 V and VCC = 15 V. This will determine the maximum value of RA + RB for 15-V operation. The maximum total (RA + RB) is 20 M. No protection against excessive pin 1, 13 current is necessary providing the package dissipation rating will not be exceeded. Matching characteristics refer to the difference between performance characteristics of each timer section. Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 5 LM556 SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 www.ti.com 6.6 Typical Characteristics DS007852-4 6 Figure 1. Minimum Pulse Width Required for Triggering Figure 2. Supply Current vs Supply Voltage (Each Section) Figure 3. High Output Voltage vs Output Source Current Figure 4. Low Output Voltage vs Output Sink Current Figure 5. Low Output Voltage vs Output Sink Current Figure 6. Low Output Voltage vs Output Sink Current Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 LM556 www.ti.com SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 Typical Characteristics (continued) DS007852-10 Figure 7. Output Propagation Delay vs Voltage Level of Trigger Pulse Figure 8. Output Propagation Delay vs Voltage Level of Trigger Pulse Figure 9. Discharge Transistor (Pin 1, 13) Voltage vs Sink Current Figure 10. Discharge Transistor (Pin 1, 13) Voltage vs Sink Current DS007852-12 Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 7 LM556 SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 www.ti.com 7 Detailed Description 7.1 Overview The LM556 dual-timing circuit is a highly stable device for generating accurate time delays or oscillations. The two timers operate independently from one another, only sharing VCC and ground. For each individual timer, additional terminals are provided for triggering or resetting. In the monostable mode of operation, the time is precisely controlled by one external resistor and capacitor. For astable mode operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms and the output circuit can source or sink up to 200 mA. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Operating Characteristics The LM556 is specified for operation from 4.5 V to 16 V. Many of the specifications apply from 0C to 70C. Parameters that can exhibit significant variance with regard to operating voltage or temperature are presented Electrical Characteristics section and in and Typical Characteristics. 7.3.2 Timing from Microseconds Through Hours The LM556 has the ability to have timing parameters from the microseconds range to hours. The time delay of the system can be determined by the time constant of the R and C values used for either the monostable or astable configuration. A nomograph is available for easy determination of R and C values for various time delays. 7.4 Device Functional Modes The LM556 can operate in both astable and monostable mode depending on the application requirements. 7.4.1 Monostable Mode The LM556 timer acts as a one-shot pulse generator. The pulse begins when the LM556 timer receives a signal at the trigger input that falls below 1/3 of the voltage supply. The width of the output pulse is determined by the time constant of an RC network. The output pulse ends when the voltage on the capacitor equals 2/3 of the supply voltage. The output pulse width can be extended or shortened depending on the application by adjusting the R and C values. More details are given in the LM555 datasheet (SNAS548). 8 Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 LM556 www.ti.com SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 Device Functional Modes (continued) Figure 11. Monostable 7.4.2 Astable (Free-Running) Mode The LM556 timer can operate as an oscillator and puts out a continuous stream of rectangular pulses having a specified frequency. The frequency of the pulse stream depends on the values of RA, RB, and C. Again, more details are given in the LM555 datasheet (SNAS548). Figure 12. Astable Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 9 LM556 SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 www.ti.com 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI's customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information The LM556 timer can be used in various configurations. A typical application for the LM556 timer in astable mode is to drive an audio device (such as a beeper) to provide a pulsed sound. This simple application can be modified to fit any application requirement. 8.2 Typical Application R2A 4 2 Vin 0.01 F 10 F R1A 1 LM556 5 6 3 10 13 12 9 8 11 14 7 Vout 0.01 F R1B 0.01 F 100 F R2B Figure 13. Typical Application 8.2.1 Design Requirements The main design requirements for this application require setting one of the timers (Timer A in this case) to the same resonant frequency as the piezo transducer which can be set by choosing R1A, R2A, and CA with Equation 1: 1.44 fo = ((R1A + 2R2 A )C ) (1) The other design choice is to decide how often and long to produce the bleeping sound. This can be set by choosing R1B and R2B of Timer B (acts as the reset button for Timer A) with Equation 2: R2B D= R1B + R2B (2) Other useful design equations like Equation 3 and Equation 4 are given below where th represents the time it takes to charge the capacitor of each individual timer and tl represents the time it takes to discharge the capacitor. 10 Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 LM556 www.ti.com SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 Typical Application (continued) th = 0.693(R1 +R2 )C where * th represents the time it takes to charge the capacitor of each individual timer (3) tl = 0.693R2C where * tl represents the time it takes to discharge the capacitor. (4) 8.2.2 Detailed Design Procedure Given that the resonant frequency of the piezo transducer is about 3 kHz, by choosing R1, C and using Equation 1, R2 can be determined to be 23.5 k. In order to have the sound be audible for half the period, the duty cycle for the triggering timer should be 50%. However, this is difficult to achieve because the recommended minimum value for R1 is 1 k. Therefore, a duty cycle of 49% was chosen for this application. By choosing R1 to be 1 k and using Equation 2, R2 is found to be 24.5 k. 8.2.3 Application Curve Output Waveform VCC 0V Capacitor Voltage Waveform VCC 2/3 VCC 1/3 VCC 0V tl th TS Figure 14. Capacitor Voltage and Output Waveforms in Astable Mode Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 11 LM556 SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 www.ti.com 9 Power Supply Recommendations The LM556 requires a voltage supply within 4.5 V to 16 V. Adequate power supply bypassing is necessary to protect associated circuitry. The minimum recommended capacitor value is 0.1 F in parallel with a 1-F electrolytic capacitor. Place the bypass capacitors as close as possible to the LM556 and minimize the trace length CAUTION Supply voltages larger than 18 V can permanently damage the device; see the Absolute Maximum Ratings table. 10 Layout 10.1 Layout Guidelines Standard PCB rules apply to routing the LM556. The parallel combination of a 0.1-F capacitor and a 1-F electrolytic capacitor should be as close as possible to the LM556. The capacitor used for the time delay should also be placed as close as possible to the discharge pin. A ground plane on the bottom layer can be used to provide better noise immunity and signal integrity. 10.2 Layout Example 2 GND 1: DIS_A 14: VCC 2: THR_A 13: DIS_B 3: CVOLT_A 12: THR_B 4: OUT_B 11: CVOLT_B 5: OUT_A 10: RST_B 6: THR_A 9: OUT_B 7: GND 8: THR_B 1 VCC Figure 15. Layout Example 12 Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 LM556 www.ti.com SNAS549A - MARCH 2000 - REVISED OCTOBER 2015 11 Device and Documentation Support 11.1 Documentation Support 11.1.1 Related Documentation For related documentation, see the following: LM555 Timer, SNAS548 11.2 Community Resources The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TI E2ETM Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support. 11.3 Trademarks E2E is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. 11.4 Electrostatic Discharge Caution These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 11.5 Glossary SLYZ022 -- TI Glossary. This glossary lists and explains terms, acronyms, and definitions. 12 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. Submit Documentation Feedback Copyright (c) 2000-2015, Texas Instruments Incorporated Product Folder Links: LM556 13 PACKAGE OPTION ADDENDUM www.ti.com 27-Sep-2017 PACKAGING INFORMATION Orderable Device Status (1) LM556 MWC Package Type Package Pins Package Drawing Qty LIFEBUY WAFERSALE Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (C) Device Marking (4/5) YS 0 1 Green (RoHS & no Sb/Br) Call TI Level-1-NA-UNLIM -40 to 85 LM556CM/NOPB LIFEBUY SOIC D 14 55 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM 0 to 70 LM556CM LM556CMX/NOPB LIFEBUY SOIC D 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM 0 to 70 LM556CM LM556CN/NOPB LIFEBUY PDIP NFF 14 25 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM 0 to 70 LM556CN (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. 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Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 28-Oct-2015 TAPE AND REEL INFORMATION *All dimensions are nominal Device LM556CMX/NOPB Package Package Pins Type Drawing SOIC D 14 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 16.4 Pack Materials-Page 1 6.5 B0 (mm) K0 (mm) P1 (mm) 9.35 2.3 8.0 W Pin1 (mm) Quadrant 16.0 Q1 PACKAGE MATERIALS INFORMATION www.ti.com 28-Oct-2015 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM556CMX/NOPB SOIC D 14 2500 367.0 367.0 35.0 Pack Materials-Page 2 MECHANICAL DATA NFF0014A N0014A N14A (Rev G) www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated (TI) reserves the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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