5.7 Oscillators and CLK_OUT
All parameters refer to GND (backplane) and are valid for Tamb = -40°C to
+85°C, VVS = 1.9-3.6V (3V application) and 2.4-5.5V (5V application) over
all process tolerances, quartz parameters Cm = 4 fF and C0 = 1
pF, unless otherwise specified. Typical values are given at VVS = 5V,
Tamb = 25°C and for a typical process, unless otherwise specified.
Crystal oscillator frequency fXTO = 24.305 MHz. Standard Microchip EEPROM
settings are used unless marked with *1.
| No. | Parameters | Test Conditions | Pin | Symbol | Min. | Typ. | Max. | Unit | Type* |
|---|---|---|---|---|---|---|---|---|---|
| 13.00 | CLK_OUT equivalent internal capacitance | Used for current calculation | 13,22 | CCLK | — | 7.5 | 10 | pF | C |
| 13.10 | Supply current increase CLK_OUT active | Apply calculation to all operation modes except OFFMode | 13 | ΔICLK | (CCLK+CLOAD_CLK_OUT) x VVS x fOUT | A | C | ||
| 13.30 | XTO frequency range | — | 10, 11 | fxto | 23.8 | 24.305 | 26.2 | MHz | C |
| 13.40 | XTO pulling due to internal capacitance and XTO tolerance | Cm = 4 fF
Tamb = 25°C | 10, 11 | ΔFXTO1 | -10 | — | +10 | ppm | B |
| 13.50 | XTO pulling due to temperature and supply voltage | Cm = 4
fF Tamb = -40°C to +85°C | 10, 11 | ΔFXTO2 | -4 | — | +4 | ppm | B |
| 13.60 | Maximum C0 of XTAL | XTAL parameter | 10, 11 | C0_max | — | 1 | 2 | pF | D |
| 13.70 | XTAL, Cm motional capacitance | XTAL parameter | 10, 11 | Cm | — | 4 | 10 | fF | D |
| 13.90 | XTAL,real part of XTO impedance at start-up | Cm = 4 fF C0 = 1 pF Tamb<85°C | 10, 11 | Re_start2 | 1100 | — | — | Ω | B |
| 14.00 | XTAL,maximum Rm after start-up | XTAL parameter | 10, 11 | Rm_max | 110 | — | — | Ω | D |
| 14.10 | Internal load capacitors | Including ESD and package capacitance. Specify XTAL for 7.5 pF load capacitance (including 1 pF PCB capacitance per pin) | 10, 11 | CL1, CL2 | 13.3 | 14 | 14.7 | pF | B |
| 14.20 | Slow RC oscillator frequency | Polling cycle can be calibrated ±2% accurate with fXTO | 22 | fSRC | -10% | 125 | +10% | kHz | A |
| 14.30 | Fast RC oscillator frequency | FRC oscillator can be calibrated ±2% accurate with fXTO | 22 | fFRC | -5% | 6.36 | +5% | MHz | A |
Note: *1 Type means: A = 100%
tested at voltage and temperature limits, B = 100% correlation tested, C =
Characterized on samples and D = Design parameter.