3©2016 Integrated Device Technology, Inc Revision B March 3, 2016
810001-21 Data Sheet
Table 1. Pin Descriptions
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Number Name Type Description
1, 2 LF1, LF0
Analog
Input/Output
Loop filter connection node pins.
3 ISET
Analog
Input/Output
Charge pump current setting pin.
4, 11, 25 V
DD
Power Core supply pins.
5, 22
nBP0,
nBP1
Input Pullup PLL Bypass control pins. See block diagram.
6, 20, 29 GND Power Power supply ground.
7 CLK_SEL Input Pulldown
Input clock select. When HIGH selects CLK1. When LOW, selects CLK0.
LVCMOS / LVTTL interface levels.
8, 9 CLK1, CLK0 Input Pulldown Single-ended clock inputs. LVCMOS/LVTTL interface levels.
10, 14,
15, 16
V0, V1,
V2, V3
Input Pulldown VCXO PLL divider selection pins. LVCMOS/LVTTL interface levels.
12 MR Input Pulldown
Active HIGH Master Reset. When logic HIGH, the internal dividers are reset
causing the output to go low. When logic LOW, the internal dividers and the
output is enabled. LVCMOS/LVTTL interface levels.
13 MF Input Pulldown FemtoClock multiplication factor select pin. LVCMOS/LVTTL interface levels.
17 V
DDA
Power Analog supply pin.
18 V
DDO
Power Output supply pin.
19 Q Output Single-ended VCXO PLL clock output. LVCMOS/LVTTL interface levels.
21 OE Input Pullup
Output enable. When logic LOW, the clock output is in high-impedance. When
logic HIGH, the output is enabled. LVCMOS/LVTTL interface levels.
23, 24 N1, N0 Input Pulldown FemtoClock output divide select pins. LVCMOS/LVTTL interface levels.
26 XTAL_SEL Input Pulldown
Crystal select. When HIGH, selects XTAL1. When LOW, selects XTAL0.
LVCMOS/LVTTL interface levels.
27,
28
XTAL_OUT1,
XTAL_IN1
Input Crystal oscillator interface. XTAL_IN1 is the input. XTAL_OUT1 is the output.
30,
31
XTAL_OUT0,
XTAL_IN0
Input Crystal oscillator interface. XTAL_IN0 is the input. XTAL_OUT0 is the output.
32 V
DDX
Power Power supply pin for VCXO charge pump.
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance 4pF
C
PD
Power Dissipation Capacitance
(per output)
V
DD
= V
DDO
= 3.465V 8.5 pF
R
PULLUP
Input Pullup Resistor 51 k
R
PULLDOWN
Input Pulldown Resistor 51 k
R
OUT
Output Impedance 22.5
