843034AY-01

www.icst.com/products/hiperclocks.html

REV. C NOVEMBER 28, 2005

1

Integrated

Circuit

Systems, Inc.

ICS843034-01

PRELIMINARY

The ICS843034-01 is a general purpose, low

phase noise LVPECL synthesizer which can

generate frequencies for a wide variety of

applications. The ICS843034-01 has a 4:1

input Multiplexer from which the following

inputs can be selected: 1 differential input, 1

single-ended input, or one of two crystal oscillators,

thus making the device ideal for frequency translation or

generation. Each differential LVPECL output pair has an

output divider which can be independently set so that two

different frequencies can be generated. Additionally, each

LVPECL output pair has a dedicated power supply pin so

the outputs can run at 3.3V or 2.5V. The ICS843034-01

also supplies a buffered copy of the reference clock or

crystal frequency on the single-ended REF_CLK pin which

can be enabled or disabled (disabled by default). The output

frequency can be programmed using either a serial or

parallel programming interface.

The ICS843034-01 has excellent <1ps phase jitter

performance over the 637kHz - 5MHz integration range, thus

making it suitable for use in Fibre Channel, SONET, and

Ethernet/1Gb Ethernet applications.

Example applications include systems which must support

both FEC and non FEC rates. In 10Gb Fibre Channel, for

example, you can use a 25.5MHz crystal to generate a

159.375MHz reference clock, and then switch to a

20.544MHz crystal to generate 164.355MHz for 66/64 FEC.

Other applications could include supporting both Ethernet

frequencies and SONET frequencies in an application. When

Ethernet frequencies are needed, a 25MHz crystal can be

used and when SONET frequencies are needed, the input

MUX can be switched to select a 38.88MHz Crystal.

• Dual differential 3.3V LVPECL outputs which can be set

independently for either 3.3V or 2.5V

• 4:1 Input Mux:

1 differential input

1 single-ended input

2 crystal oscillator interfaces

• CLK, nCLK pair can accept the following differential

input levels: LVPECL, LVDS, LVHSTL, HCSL, SSTL

• TEST_CLK accepts LVCMOS or LVTTL input levels

• Output frequency range: 30.625MHz to 640MHz

• Crystal input frequency range: 12MHz to 40MHz

• VCO range: 490MHz to 640MHz

• Parallel or serial interface for programming feedback divider

and output dividers

• RMS phase jitter at 106.25MHz, using a 25.5MHz crystal

(637kHz to 5MHz): 0.61ps (typical)

• Supply voltage modes:

LVPECL outputs (core/outputs):

3.3V/3.3V

3.3V/2.5V

REF_CLK output (core/outputs):

3.3V/3.3V

3.3V/2.5V

• 0°C to 70°C ambient operating temperature

• Available in both standard and lead-free RoHS-compliant

packages

HiPerClockS™

ICS

48 47 46 45 44 43 42 41 40 39 38 37

13 14 15 16 17 18 19 20 21 22 23 24

1

2

3

4

5

6

7

8

9

10

11

12

36

35

34

33

32

31

30

29

28

27

26

25

M8

NB0

NB1

NB2

OE_REF

OE_A

OE_B

NA0

NA1

NA2

XTAL_OUT1

XTAL_IN1

XTAL_OUT0

XTAL_IN0

TEST_CLK

SEL1

SEL0

S_LOAD

S_DATA

S_CLOCK

MR

ICS843034-01

48-Pin LQFP

7mm x 7mm x 1.4mm

package body

Y Package

Top View

The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial

product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.