LM556

LM556 Dual Timer March 2000 LM556 Dual Timer General Description 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. Features 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 LM556CM LM556CMX LM556CN Package Marking LM556CM LM556CM LM556CN Media Transport Rails 2.5k Units Tape and Reel Rails NSC Drawing M14A N14a © 2000 National Semiconductor Corporation DS007852 www.national.com LM556 Schematic Diagram DS007852-2 www.national.com 2 LM556 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are req...