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SM1125 Datasheet(PDF) 12 Page - Nippon Precision Circuits Inc

Part # SM1125
Description  Multimelody IC for Pagers
PDF  13 Pages
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Manufacturer  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM1125 Datasheet(HTML) 12 Page - Nippon Precision Circuits Inc

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SM1125 series
SEIKO NPC CORPORATION —12
OSCILLATOR FREQUENCY MEASUREMENT
The measurement circuit below shows a SM1125
××V with built-in RC oscillator circuit and external RC oscil-
lator components capacitor CO and resistor RO.
When ST is switched to VDD, the oscillator starts and outputs a pulse on MTO. The output pulse is counted
using a frequency counter.
Note that the board mounting and wiring will marginally affect the output frequency, even for equivalent values for RO and CO.
OSC
SI
SC
ST
VDD
VSS
MTO
TEST
RO
CO
Switch
Frequency Counter
SM1125
V



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