ZSCT1555D8 Diodes Zetex, ZSCT1555D8 Datasheet

IC TIMER PRECISION 555 8-DIP

ZSCT1555D8

Manufacturer Part Number
ZSCT1555D8
Description
IC TIMER PRECISION 555 8-DIP
Manufacturer
Diodes Zetex
Type
555 Type, Timer/Oscillator (Single)r
Datasheet

Specifications of ZSCT1555D8

Frequency
330kHz
Voltage - Supply
0.9 V ~ 6 V
Current - Supply
150µA
Operating Temperature
-20°C ~ 100°C
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Count
-
Issue 3 - July 2006
© Zetex Semiconductors plc 2006
PRECISION SINGLE CELL TIMER
ISSUE 3 - JULY 2006
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
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
CONTROL
DISCHARGE
TRIGGER
THRESH
RESET
8
5
2
6
4
7
VCC
CC
by internal resistors.
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
APPLICATIONS
0.9V supply operating voltage guaranteed
Pin connections comparable with 555
series timers
Very low quiescent current 74 A
SO8 and DIL8 packages
Operating temperature range
compatible with battery technologies
Portable and battery powered
equipment
Low voltage and low power systems
ZSCT1555
OUTPUT
GND
3
1

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ZSCT1555D8 Summary of contents

Page 1

PRECISION SINGLE CELL TIMER ISSUE 3 - JULY 2006 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 ...

Page 2

ZSCT1555 ABSOLUTE MAXIMUM RATINGS Supply Voltage Input Voltages (Cont, Reset, Thres, Trig) Output Current Operating Temperature Storage Temperature ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):T SYMBOL PARAMETER V Supply Voltage CC I Supply Current CC V Threshold Voltage TH I ...

Page 3

ELECTRICAL CHARACTERISTICS (Continued) TEST CONDITIONS (Unless otherwise stated):T SYMBOL PARAMETER t Output pulse rise time R t Output pulse fall time F Timing error, Monostable Initial accuracy (Note 2) t (m) IA Drift with supply voltage t (m) V Drift ...

Page 4

ZSCT1555 +100°C 2 +25°C -20° Lowest Voltage Level of Trigger Pulse (xVcc) Minimum Pulse Width Required for Triggering 5 4 +100°C 3 +25°C -20° Lowest Voltage Level of Trigger Pulse ...

Page 5

Vcc=1.5v 0.8 0.6 -20°C 0.4 +25°C +100°C 0.2 0.0 0.001 0.01 High-Level Output Current (mA) Output High Voltage Drop v Output Current 2.0 Vcc=1.5v 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 0.01 0.1 Low Level Output ...

Page 6

ZSCT1555 FUNCTIONAL DIAGRAM FUNCTIONAL TABLE RESET TRIGGER VALUE THRESHOLD Low N/A High < High > High > POWER DERATING TABLE Package TA 25°C Power Rating N8 625mW D8 625mW Issue 3 - July 2006 ...

Page 7

APPLICATIONS INFORMATION Many configurations of the ZSCT1555 are possible. The following gives a selection of a few of these using the most basic monostable and astable connections. The final application example in astable mode shows the device optimum use for ...

Page 8

ZSCT1555 Figure 5 shows the monostable mode used as a pulse width modulator. Here the trigger pin is supplied with a continuous pulse train, the resulting output pulse width is modulated by a signal applied to the control pin. Figure ...

Page 9

Figure 9 gives an easy selection for RA, RB and C values. T 100 100k 10M 0.1 0.01 (RA+2RB) 0.001 0 Free Running Frequency (Hz) Figure 9 Similar to the PWM circuit of Figure 5 ...

Page 10

ZSCT1555 The circuit of Figure 12 shows the device in astable mode operating as part of a single cell boost converter. This circuit generates a 5 volt supply from a single battery cell. The circuit output voltage is maintained down ...

Page 11

Europe Americas Zetex GmbH Zetex Inc Streitfeldstraße 19 700 Veterans Memorial Highway D-81673 München Hauppauge, NY 11788 Germany USA Telefon: (49 Telephone: (1) 631 360 2222 Fax: (49 Fax: (1) ...

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