LM556 LM556 Dual Timer Literature Number: SNAS549 LM556 Dual Timer General Description Features The LM556 Dual timing circuit is a highly stable controller capable of producing accurate time delays or oscillation. The 556 is a dual 555. 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 200mA. n n n n n n n n n 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 200mA Output and supply TTL compatible Temperature stability better than 0.005% per C Normally on and normally off output Applications n n n n n n n Precision timing Pulse generation Sequential timing Time delay generation Pulse width modulation Pulse position modulation Linear ramp generator Connection Diagram Dual-In-Line, Small Outline Packages DS007852-1 Top View Ordering Information Package 14-Pin SOIC 14-Pin MDIP Part Number Package Marking Media Transport LM556CM LM556CM Rails LM556CMX LM556CM 2.5k Units Tape and Reel LM556CN LM556CN Rails (c) 2000 National Semiconductor Corporation DS007852 NSC Drawing M14A N14a www.national.com LM556 Dual Timer March 2000 DS007852-2 LM556 Schematic Diagram www.national.com 2 Storage Temperature Range -65C to +150C Soldering Information Dual-In-Line Package Soldering (10 Seconds) 260C Small Outline Packages Vapor Phase (60 Seconds) 215C Infrared (15 Seconds) 220C 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 Power Dissipation (Note 2) LM556CM LM556CN Operating Temperature Ranges LM556C +18V 410 mW 1620 mW 0C to +70C Electrical Characteristics (TA = 25C, VCC = +5V to +15V, unless otherwise specified) Parameter Conditions Limits Units LM556C Min Supply Voltage Supply Current (Each Timer Section) Typ 4.5 VCC = 5V, RL = VCC = 15V, RL = (Low State) (Note 3) 3 10 Max 16 V 6 14 mA Timing Error, Monostable Initial Accuracy Drift with Temperature RA = 1k to 100k, 0.75 % 50 ppm/C C = 0.1F, (Note 4) Accuracy over Temperature 1.5 % Drift with Supply 0.1 %/V Timing Error, Astable Initial Accuracy 2.25 % Drift with Temperature RA, RB = 1k to 100k, 150 ppm/C Accuracy over Temperature C = 0.1F, (Note 4) 3.0 % Drift with Supply Trigger Voltage 0.30 4.5 5 5.5 V VCC = 5V 1.25 1.67 2.0 V 0.2 1.0 A Trigger Current Reset Voltage 0.4 Reset Current Threshold Current VTH = V-Control (Note 6) VTH = 11.2V Control Voltage Level and Threshold Voltage VCC = 15V VCC = 5V 9 2.6 Pin 1, 13 Leakage Output High Pin 1, 13 Sat %/V VCC = 15V 0.5 1 V 0.1 0.6 mA 0.03 0.1 250 A nA 10 3.33 11 4 V 1 100 nA (Note 7) Output Low VCC = 15V, I = 15mA 180 300 mV Output Low VCC = 4.5V, I = 4.5mA 80 200 mV Output Voltage Drop (Low) VCC = 15V ISINK = 10mA 0.1 0.25 V ISINK = 50mA 0.4 0.75 V ISINK = 100mA 2 2.75 V ISINK = 200mA 2.5 V VCC = 5V ISINK = 8mA V ISINK = 5mA 0.25 3 0.35 V www.national.com LM556 Absolute Maximum Ratings (Note 1) LM556 Electrical Characteristics (Continued) (TA = 25C, VCC = +5V to +15V, unless otherwise specified) Parameter Conditions Limits Units LM556C Output Voltage Drop (High) Min Typ 12.5 V ISOURCE = 100mA, VCC = 15V 12.75 13.3 V VCC = 5V 2.75 ISOURCE = 200mA, VCC = 15V Rise Time of Output Fall Time of Output Matching Characteristics Max 3.3 V 100 ns 100 ns (Note 8) Initial Timing Accuracy 0.1 Timing Drift with Temperature 10 Drift with Supply Voltage 0.2 2.0 % ppm/C 0.5 %/V Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Note 2: 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). Note 3: Supply current when output high typically 1mA less at VCC = 5V. Note 4: Tested at VCC = 5V and VCC = 15V. Note 5: As reset voltage lowers, timing is inhibited and then the output goes low. Note 6: This will determine the maximum value of RA + RB for 15V operation. The maximum total (RA + RB) is 20 M. Note 7: No protection against excessive pin 1, 13 current is necessary providing the package dissipation rating will not be exceeded. Note 8: Matching characteristics refer to the difference between performance characteristics of each timer section. Note 9: Refer to RETS556X drawing of military LM556J versions. Typical Performance Characteristics Minimum Pulse Width Required for Triggering Supply Current vs. Supply Voltage (Each Section) DS007852-4 DS007852-3 www.national.com 4 LM556 Typical Performance Characteristics (Continued) High Output Voltage vs. Output Source Current Low Output Voltage vs. Output Sink Current DS007852-5 Low Output Voltage vs. Output Sink Current DS007852-6 Low Output Voltage vs. Output Sink Current DS007852-7 Output Propagation Delay vs. Voltage Level of Trigger Pulse DS007852-8 Output Propagation Delay vs. Voltage Level of Trigger Pulse DS007852-9 DS007852-10 5 www.national.com LM556 Typical Performance Characteristics (Continued) Discharge Transistor (Pin 1, 13) Voltage vs. Sink Current Discharge Transistor (Pin 1, 13) Voltage vs. Sink Current DS007852-11 www.national.com DS007852-12 6 LM556 Physical Dimensions inches (millimeters) unless otherwise noted Small Outline Package (M) NS Package Number M14A 14-Lead (0.118" Wide) Molded Mini Small Outline Package NS Package Number N14A 7 www.national.com LM556 Dual Timer Notes 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 AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. 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