ZSCT1555N8 查看數據表（PDF） - Zetex => Diodes

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ZSCT1555N8

PRECISION SINGLE CELL TIMER

Zetex => Diodes 

PRECISION SINGLE CELL TIMER

ZSCT1555

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

duty cycle can be accurately and

independently controlled with two external

resistors and one capacitor.

The threshold and trigger levels are normally

set as a proportion of VCC 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

SCHEMATIC DIAGRAM

8

VCC

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

• 0.9V supply operating voltage guaranteed

• Pin connections comparable with 555

series timers

• Very low quiescent current 74 µA

• SO8 and DIL8 packages

• Operating temperature range

compatible with battery technologies

APPLICATIONS

• Portable and battery powered

equipment

• Low voltage and low power systems

CONTROL

5

6

THRESH

2

TRIGGER

7

DISCHARGE

4

RESET

4-311

3

OUTPUT

1

GND

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