5.7 Oscillators and CLK_OUT

All parameters refer to GND (backplane) and are valid for T_amb = -40°C to +85°C, V_VS = 1.9-3.6V (3V application) and 2.4-5.5V (5V application) over all process tolerances, quartz parameters C_m = 4 fF and C₀ = 1 pF, unless otherwise specified. Typical values are given at V_VS = 5V, T_amb = 25°C and for a typical process, unless otherwise specified. Crystal oscillator frequency f_XTO = 24.305 MHz. Standard Microchip EEPROM settings are used unless marked with ^*1.

Table 5-4. Oscillators and CLK_OUT
No.	Parameters	Test Conditions	Pin	Symbol	Min.	Typ.	Max.	Unit	Type*
13.00	CLK_OUT equivalent internal capacitance	Used for current calculation	13,22	C_CLK	—	7.5	10	pF	C
13.10	Supply current increase CLK_OUT active	Apply calculation to all operation modes except OFFMode	13	ΔI_CLK	(C_CLK+C_{LOAD_CLK_OUT}) x V_VS x f_OUT			A	C
13.30	XTO frequency range	–	10, 11	f_xto	23.8	24.305	26.2	MHz	C
13.40	XTO pulling due to internal capacitance and XTO tolerance	C_m = 4 fF T_amb = 25°C	10, 11	ΔF_XTO1	-10	—	+10	ppm	B
13.50	XTO pulling due to temperature and supply voltage	C_m = 4 fF T_amb = -40°C to +85°C	10, 11	ΔF_XTO2	-4	—	+4	ppm	B
13.60	Maximum C₀ of XTAL	XTAL parameter	10, 11	C_{0_max}	—	1	2	pF	D
13.70	XTAL, C_m motional capacitance	XTAL parameter	10, 11	C_m	—	4	10	fF	D
13.80	XTAL,real part of XTO impedance at start-up	C_m = 4 fF C₀ = 1 pF	10, 11	R_{m_start1}	950	—	—	W	B
13.90	XTAL,real part of XTO impedance at start-up	C_m = 4 fF C₀ = 1 pF T_amb<85°C	10, 11	R_{e_start2}	1100	—	—	W	B
14.00	XTAL,maximum R_m after start-up	XTAL parameter	10, 11	R_{m_max}	110	—	—	W	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	C_L1, C_L2	13.3	14	14.7	pF	B
14.20	Slow RC oscillator frequency	Polling cycle can be calibrated ±2% accurate with f_XTO	22	f_SRC	-10%	125	+10%	kHz	A
14.30	Fast RC oscillator frequency	FRC oscillator can be calibrated ±2% accurate with f_XTO	22	f_FRC	-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