MK2049-34

3.3 V Communications Clock PLL

MDS 2049-34 C

1

Revision 121400

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295-9800tel• www.icst.com

• Packaged in 20 pin SOIC

• 3.3 V ±5% operation

• Fixed I/O phase relationship on all selections

• Meets the TR62411, ETS300 011, and GR-1244

specification for MTIE, Pull-in/Hold-in Range,

Phase Transients, and Jitter Generation for

Stratum 3, 4, and 4E

• Accepts multiple inputs: 8 kHz backplane clock,

Loop Timing frequencies, or 10-36 MHz

• Locks to 8 kHz ±100 ppm (External mode)

• Buffer Mode allows jitter attenuation of

10–36 MHz input and x1/x0.5 or x2/x4 outputs

• Exact internal ratios enable zero ppm error

• Output clock rates include T1, E1, T3, E3, ISDN,

xDSL, and OC3 submultiples

• See the MK2049-01, -02, and -03 for more

selections at VDD = 5 V

The MK2049-34 is a Phase-Locked Loop (PLL)

based clock synthesizer that accepts multiple input

frequencies. With an 8 kHz clock input as a

reference, the MK2049-34 generates T1, E1, T3,

E3, ISDN, xDSL, and other communications

frequencies. This allows for the generation of

clocks frequency-locked and phase-locked to an

8 kHz backplane clock, simplifying clock

synchronization in communications systems. The

MK2049-34 can also accept a T1 or E1 input clock

and provide the same output for loop timing. All

outputs are frequency locked together and to the

input.

This part also has a jitter-attenuated Buffer

capability. In this mode, the MK2049-34 is ideal

for filtering jitter from 27 MHz video clocks or

other clocks with high jitter.

ICS/MicroClock can customize these devices for

many other different frequencies. Contact your

ICS/MicroClock representative for more details.

Block Diagram

Description

Features

VDD

GND

PLL

Clock

Synthesis,

Control, and

Jitter

Attenuation

Circuitry

Output

Buffer

Output

Buffer

External/

Loop Timing

Mux

FS3:0

Clock

Input

CAP1

CAP2

CLK

CLK/2

Output

Buffer

8 kHz

(External

Mode only)

Crystal

Oscillator

Reference

Crystal

X1

X2

4

3

3

RES

FCAP