LM556

LM556 - LM556 Dual Timer March 2000 LM556 Dual Timer General Description The LM556 Dual timing circuit is a highly stable controller capable of

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LM556 Dual Timer General Description The LM556 Dual timing circuit is a highly stable controller ca- pable 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 oper- ate independently of each other sharing only V CC and ground. The circuits may be triggered and reset on falling waveforms. The output structures may sink or source 200mA. Features n Direct replacement for SE556/NE556 n Timing from microseconds through hours n Operates in both astable and monostable modes n Replaces two 555 timers n Adjustable duty cycle n Output can source or sink 200mA n Output and supply TTL compatible n Temperature stability better than 0.005% per ˚C n Normally on and normally off output Applications n Precision timing n Pulse generation n Sequential timing n Time delay generation n Pulse width modulation n Pulse position modulation n Linear ramp generator Connection Diagram Ordering Information Package Part Number Package Marking Media Transport NSC Drawing 14-Pin SOIC LM556CM LM556CM Rails M14A LM556CMX LM556CM 2.5k Units Tape and Reel 14-Pin MDIP LM556CN LM556CN Rails N14a Dual-In-Line, Small Outline Packages DS007852-1 Top View March 2000 LM556 Dual Timer © 2000 National Semiconductor Corporation DS007852 www.national.com
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Schematic Diagram DS007852-2 LM556 www.national.com 2
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Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage +18V Power Dissipation (Note 2) LM556CM 410 mW LM556CN 1620 mW Operating Temperature Ranges LM556C 0˚C to +70˚C Storage Temperature Range -65˚C to +150˚C Soldering Information Dual-In-Line Package Soldering (10 Seconds) 260˚C
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This note was uploaded on 02/08/2011 for the course EE 459L taught by Professor Weber during the Spring '11 term at USC.

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LM556 - LM556 Dual Timer March 2000 LM556 Dual Timer General Description The LM556 Dual timing circuit is a highly stable controller capable of

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