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<P>The <STRONG>555</STRONG> timer is a highly stable controller capable of producing accurate time delays or oscillation. The <STRONG>556</STRONG> timer combines two 555 timers on a single chip.</P><P>The 555 can be used in countless applications and has three recognised operating modes. In monostable mode the 555 functions as a one-shot or pulse stretcher. Applications include timers, missing pulse detection and bouncefree switches.</P><P>In astable mode the 555 can operate as an oscillator. Applications include LED and lamp flashers, pulse generation, logic clocks, tone generation, security alarms and Pulse Width Modulation (PWM).</P><P>In bistable mode the 555 can operate as a flip-flop or changeover. Applications include bouncefree latched switches.</P><P>The <STRONG>ICM7555</STRONG> and <STRONG>ICM7556</STRONG> are improved versions including lower supply current and a wide supply voltage range.</P>
  • Bipolar and CMOS technologies, CMOS offering lower power consumption (1mW typ at VDD=5V)
  • TTL logic compatible
  • Through hole and surface mount
  • Choice of leading brands
DeviceFunctionManufacturerPackageOrder code
NE555NSingle timerTIDIL-882-0336
NE555DSingle timerTISO-882-0338
TS555CDLow power CMOS single timerTISO-882-1050
TLC555IDCMOS single timerTISOIC-882-1200
TLC555CPLinCMOS timerTIDIL-882-0342
SA555PSingle timer TTL compatibleTIDIL-851-7531
ICM7555IPASingle low power timerIntersilDIL-882-0774
TLC556CNDual LinCMOS timerTIDIL-851-7532
NE556DDual timer TTL compatibleTISO-1451-7533
NE556NDual timerTIDIL-1482-0344
TS556CNLow power CMOS dual timerSTDIL-1482-1052
ICM7556IPDDual low power timerIntersilDIL-1482-0776