FemtoClock
®
Crystal-to-3.3V LVPECL
Frequency Synthesizer With/Integrated Fanout Buffer
843256 DATA SHEET
2 REVISION B 12/18/14
TABLE 1. PIN DESCRIPTIONS
TABLE 2. PIN CHARACTERISTICS
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance 4 pF
R
PULLDOWN
Input Pulldown Resistor 51 kΩ
R
PULLUP
Input Pullup Resistor 51 kΩ
Number Name Type Description
1, 2 V
CCO
Power Output supply pins.
3, 4 nQ2, Q2 Output Differential output pair. LVPECL interface levels.
5, 6 nQ1, Q1 Output Differential output pair. LVPECL interface levels.
7, 8 nQ0, Q0 Output Differential output pair. LVPECL interface levels.
9 PLL_BYPASS Input Pullup
Selects between the PLL and crystal inputs as the input to the dividers.
When LOW, selects PLL. When HIGH, selects XTAL_IN, XTAL_OUT.
LVCMOS / LVTTL interface levels.
10 V
CCA
Power Analog supply pin.
11 V
CC
Power Core supply pin.
12 FB_SEL Input Pulldown Feedback frequency select pin. LVCMOS/LVTTL interface levels.
13,
14
XTAL_IN, XTAL_
OUT
Input
Crystal oscillator interface. XTAL_IN is the input.
XTAL_OUT is the output.
15,
18
N_SEL0
N_SEL1
Input Pullup Output frequency select pin. LVCMOS/LVTTL interface levels.
16, 17 V
EE
Negative supply pin.
19, 20 nQ5, Q5 Output Differential output pair. LVPECL interface levels.
21, 22 nQ4, Q4 Output Differential output pair. LVPECL interface levels.
23, 24 nQ3, Q3 Output Differential output pair. LVPECL interface levels.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
