RCOSC2

High Frequency RC-Oscillator

 

Functional Description

RCOSC2 is a simple RC oscillator for internal digital clock purpose. No external components are required. The stability depends mainly on the reference current IB1U. RES = high clamps the output voltage CLK = high (no power down function). The reference current controls the frequency linearly.

This cell requires a single 5V supply and a bias current.

symbol

Key Features

  • Power Supply: VDDA =5V
  • Simple RC-Oscillator
  • Digital Square Wave Outputs
  • No External Components
  • Current controlled Frequency Range
    250...8000 kHz
  • Reset Input


    • Height: 370 µm
    Width: 130 µm
    Area: 48 000 µm²

Pin List

PinDescriptionCapacitance
RES Reset Signal Input 0.01 pF
IB1U Bias Source Current -
CLK Digital Output -
VDDA Power Supply -
VSSA Ground -

Electrical Parameters

(IB1U = 1µA)
Parameter Symbol Min Typ Max Unit
Power supply
VDD
 4.5
5.0
 5.5
V
Temperature Range  Temp  -40 25 85 °C
Supply current
IDD
 
65
 
µA
 Oscillation frequency (@IB1u=1µ)
f
  
 1.3
  
MHz
control factor for frequency bias current cf   0.75   µA/MHz
Recommended upper frequency limit
fu
  
 8
  
MHz
Recommended lower frequency limit fl    250   kHz
Duty cycle Dty   50   %

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