IP1844 View Datasheet(PDF) - Semelab - > TT Electronics plc
Part Name
Description
MFG CO.
'IP1844' PDF : 6 Pages View PDF
SEME
LAB
IP1844 SERIES
IP1845 SERIES
APPLICATIONS INFORMATION
Oscillator Waveforms and Maximum Duty Cycle
V REF 8
RT
RT CT 4
CT
GND 5
LARGE R T
SMALL C T
SMALL R T
LARGE C T
V - Pin 4
(Pin 7 for 14 Pin D Package)
Internal Clock
Output – Max. Duty Cycle
V - Pin 6
(Pin 10 for 14 Pin D Package)
V - Pin 4
(Pin 7 for 14 Pin D Package)
Internal Clock
Output – Max. Duty Cycle
V - Pin 6
(Pin 10 for 14 Pin D Package)
Oscillator timing capacitor CT is charged by VREF through RT and discharged by an
internal current source. During the discharge time, the internal clock signal blanks the
output to the low state. Selection of RT and CT therefore determines both oscillator
frequency and maximum duty cycle.
Charge and discharge times are determined by the formulae:
tc ≈ 0.55 RTCT
( ) td ≈ RTCT Rn
.0063 RT – 2.3
.0063 – 4
Resultant frequency
f
=
(tc
1
+
td)
For RT > 5kΩ,
Resultant frequency
f≈
1.8
(RTCT)
Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
Prelim. 2/95
Share Link: 
