FemtoClock

Frequency Synthesizer With/Integrated Fanout Buffer

843256 DATA SHEET

2

REVISION B 12/18/14

Symbol

Parameter

Test Conditions

Minimum

Typical

Maximum

Units

C

IN

Input Capacitance

4

pF

R

PULLDOWN

Input Pulldown Resistor

51

k

Ω

R

PULLUP

Input Pullup Resistor

51

k

Ω

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.