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SCT1555 Datasheet

  • SCT1555

  • PRECISION SINGLE CELL TIMER

  • 10頁

  • ZETEX

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PRECISION SINGLE CELL TIMER
ISSUE 2 - MAY 1998
DEVICE DESCRIPTION
These devices are precision timing circuits for
generation of accurate time delays or
oscillation. Advanced circuit design means that
these devices can operate from a single battery
cell with the minimum of quiescent current.
In monostable mode time delays are
controlled by a single resistor and capacitor
network. In astable mode the frequency and
du t y cy c l e c a n be a c c u r a t e l y an d
independently controlled with two external
resistors and one capacitor.
The threshold and trigger levels are normally
set as a proportion of V
CC
by internal resistors.
These levels can be programmed by the use
of the control input pin.
When the trigger input reduces to a value
below the trigger level, the flip-flop is set and
the output goes high. With the trigger input
above the trigger level and the threshold input
above the threshold level, the flip-flop is reset
ZSCT1555
and the output goes low. The reset pin has
priority over all the other inputs and is used
to start new timing cycles. A low on the reset
input causes the flip-flop to reset forcing the
output low. Whenever the output is forced
low then the internal discharge transistor is
turned on.
FEATURES
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0.9V supply operating voltage guaranteed
Pin connections comparable with 555
series timers
Very low quiescent current 74
碌A(chǔ)
SO8 and DIL8 packages
Operating temperature range
compatible with battery technologies
APPLICATIONS
Portable and battery powered
equipment
Low voltage and low power systems
SCHEMATIC DIAGRAM
8
VCC
CONTROL
5
6
THRESH
2
TRIGGER
7
DISCHARGE
3
OUTPUT
4
RESET
1
GND
4-311

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