8T49N240 Datasheet, PDF (44/76 Pages) Integrated Device Technology – FemtoClock NG Ultra-Performance

8T49N240 Datasheet
Table 34. Input Frequency Characteristics, V_CC = 3.3V±5% or 2.5V±5%, T_A = -40°C to 85°C
Symbol
Parameter
Test Conditions
Minimum Typical Maximum Units
f_IN
f_PD
f_SCLK
Input
OSCI, OSCO
Frequency^[a]
CLKx, nCLKx^[c]
Phase Detector Frequency^[d]
Serial Port
Clock SCLK _I²_{C Operation}
(slave mode)
Using a crystal
(See Table 35 for Crystal
Characteristics)
Over-driving Crystal Input
Doubler Logic Enabled^[b]
Over-driving Crystal Input
Doubler Logic Disabled^[b]
10
10
10
0.008
0.008
100
54
MHz
54
MHz
108
MHz
875
MHz
8
MHz
400
kHz
[a] For the input reference frequency, the divider values must be set for the VCO to operate within its supported range.
[b] For optimal noise performance, the use of a quartz crystal is recommended (for more information, see Overdriving the XTAL Interface).
[c] CLKx denotes CLK0, CLK1; nCLKx denotes nCLK0, nCLK1.
[d] Pre-dividers must be used to divide the CLKx frequency down to an f_PD valid frequency range.
Table 35. Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Load Capacitance (C_L)
Frequency Stability (total)
Test Conditions
Crystal frequency  40MHz
Crystal frequency 40MHz
Minimum Typical Maximum
Fundamental
10
54
15
30
12
12
-100
100
Units
MHz

pF
pF
ppm
©2017 Integrated Device Technology, Inc.
44
May 31, 2017