ICS843002I-40

175MHZ, FEMTOCLOCKS™ VCXO BASED SONET/SDH JITTER ATTENUATOR

IDT™ / ICS™ VCXO BASED SONET/SDH JITTER ATTENUATOR

3

ICS843002AKI-40 REV. A NOVEMBER 7, 2007

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.

Power

Core power supply pin.

5

CLK0

Input

Pulldown

Non-inverting differential clock input.

6nCLK0

Input

Pullup

Pulldown

7

CLK_SEL

Input

Pulldown

Input clock select. LVCMOS/LVTTL interface levels. See Table 3A.

8, 11, 22

nc

Unused

No connect.

9,

10

QA_SEL1,

QA_SEL0

Input

Pullup

Output divider control for QA/nQA LVPECL outputs.

LVCMOS/LVTTL interface levels.See Table 3C.

12,

13

QB_SEL1,

QB_SEL0

Input

Pullup

Output divider control for QB/nQB LVPECL outputs.

LVCMOS/LVTTL interface levels.See Table 3C.

14

Power

Analog supply pin.

15, 16

QA, nQA

Output

Differential clock output pair. LVPECL interface levels.

17, 27

Power

Negative supply pins.

18, 19

QB, nQB

Output

Differential clock output pair. LVPECL interface levels.

20

Power

Output supply pin for LVPECL outputs.

21

Power

Output supply pin for LVCMOS/LVTTL outputs.

23

LOR1

Output

Alarm output, loss of reference for CLK1/nCLK1.

LVCMOS/LVTTL interface levels.

24

LOR0

Output

Alarm output, loss of reference for CLK0/nCLK0.

LVCMOS/LVTTL interface levels.

25

nCLK1

Input

Pullup

Pulldown

26

CLK1

Input

Pulldown

Non-inverting differential clock input.

28,

29,

30

R_SEL0,

R_SEL1,

R_SEL2

Input

Pulldown

Input divider selection. LVCMOS/LVTTL interface levels. See Table 3B.

31,

32

XTAL_OUT,

XTAL_IN

Input

Crystal oscillator interface. The XTAL_IN is the input.

XTAL_OUT is the output.

Symbol

Parameter

Test Conditions

Minimum

Typical

Maximum

Units

Input Capacitance

4

pF

Input Pullup Resistor

50

k

Ω

50

k

Ω