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Price: £ - £
Components > Semiconductors > Timers
Archived Product
NE555N Timer NE555N
NE555N Timer NE555N
    The 555 is a highly
    stable device for
    generating accurate time
    delays or oscillation.
    Additional terminals are
    provided for triggering
    or resetting if desired.
    In the time delay
    monostable mode of
    operation the time is
    precisely controlled by
    one external resistor and
    one capacitor. For stable
    operation as an
    oscillator the free
    running frequency and the
    duty cycle are both
    accurately controlled
    with two external
    resistors and one
    capacitor. The circuit
    may be triggered and
    reset on falling
    waveforms and the output
    structure can source or
    sink up to 200mA or drive
    TTL directly. This IC may
    also be correctly
    supplied marked as
    MC1455PI. Supply
    decoupling must be
    provided close to the IC
    to counter the crowbar
    effect of the devices
    internal discharge switch
    a suitable value is 10 to
    100microF as shown in the
    accompanying
    diagrams.Monostable
    ModeTime Delay vs
    RltsubgtAltsubgt and COn
    time after triggering
    i.e. applying a voltage
    to pin 2 less than 13
    supply voltage is equal
    to 1.1RAC. The load may
    be connected to VCC for
    normally-on operation or
    between pin 3 and ground
    for normally- off.
    Connecting reset to
    ground during on time
    drives the output low
    until a new trigger pulse
    occurs. Additional
    trigger pulses during on
    time have no effect. If
    reset is not being used
    connect it to VCC.Astable
    Mode OscillatorFree
    Running Frequencyvs
    RltsubgtAltsubgt
    RltsubgtBltsubgt and CThe
    frequency is equal to
    1.44RA 2RBC. The charge
    time output high is given
    by t1 0.693RA RBC and the
    discharge time output low
    is given by t2
    0.693RBC.Characteristics
    typical 4.5V min 16V
    maxSupply current3mA VCC
    5V 10mAVCC 15VThreshold
    voltageVCC x 0.667Trigger
    voltage5V VCC 15V
    1.67VVCC 5VTrigger
    current0.5microAThreshold
    current0.1microAControl
    voltage level10V VCC 15V
    3.33V
Availability: In Stock
£0.59
Archived Product
TS5556CN Low Power Timer TS555CN
TS5556CN Low Power Timer
TS555CN
    A low-power pin-for-pin
    replacement for the 555
    but requiring only about
    one fiftieth of the
    supply current. The
    device has extremely low
    trigger threshold and
    reset current typically
    20pA and a very wide
    supply voltage range 2V
    to 18V. Supply decoupling
    close to the device is
    not required. The outputs
    are fully CMOS TTL and
    MOS compatible. Choose
    high values for timing
    resistors to keep supply
    currents low and low
    values for capacitance
    which should be low
    leakage types not
    ceramic.
    SpecificationsSupply
    voltage2V to 18VSupply
    current170microA at 5V
    360microA at 15VThreshold
    currentVDD 5V10pATrigger
    currentVDD 5V10pAReset
    currentVDD
    5Vplusmn10pAReset voltage
    level0.7VOutput sink
    current100mA maxOutput
    source current10mA maxMax
    frequencyin astable
    mode2.1MHz
Availability: In Stock
£0.77
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