RCOSC1 |
Low Frequency RC-Oscillator |
Functional Description
RCOSC1 is a simple RC oscillator for internal digital clock purpose.
No external components are required.
The stability depends mainly on the reference current IBC.
The reference current controls the frequency linearly.
If the input RES is set to high then the output OSC is clamped to high (no power down function).
This cell requires a single 5V supply and two bias currents.
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|
Key Features
- Power Supply: VDDA=5V
- Simple RC-Oscillator
- Low Power Consumption
- Digital Square Wave Outputs
- No External Components
- Current controlled Frequency Range
10...250 kHz
| Height: | 370 | µm |
| Width: | 90 | µm |
| Area: | 33 300 | µm² |
|
Pin List
| Pin | Description | Capacitance |
|---|
| RES | Reset Signal Input | 0.01 pF |
| IBO | Bias Current Frequency | - |
| IBC | Bias Current Comparators | - |
| OSC | Digital Output | - |
| OSCN | Inverted Digital Output | - |
| VDDA | Power Supply | - |
| VSSA | Ground | - |
|
Electrical Parameters
(IBO = 1µA, IBC = 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
|
|
3*IBO + 6*IBC
|
|
µA
|
|
Oscillation frequency (@IBO=1µ)
|
f
|
|
20
|
|
kHz
|
control factor for frequency bias current
(see remark 1) |
cf |
|
0.05 |
|
µA/kHz |
|
Recommended upper frequency limit
|
fu
|
|
200
|
|
kHz
|
| Recommended lower frequency limit |
fl |
|
10 |
|
kHz |
| Duty cycle |
Dty |
|
50 |
|
% |
Remark 1: A bias source current of IBO = 2µA is recommended for a frequency of 30 kHz, 5µA for 80kHz and 10µA for 140kHz.
