ICS85357-11 datasheet(1/12 Pages) ICST

Part #	ICS85357-11

Description	4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V LVPECL / ECL MULTIPLEXER

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Manufacturer	ICST [Integrated Circuit Systems]

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85357AG-11

www.icst.com/products/hiperclocks.html

REV. A JULY 25, 2001

1

Integrated

Circuit

Systems, Inc.

ICS85357-11

4:1 OR 2:1, CRYSTAL OSCILLATOR-TO-3.3V

LVPECL / ECL MULTIPLEXER

GENERAL DESCRIPTION

The ICS85357-11 is a 4:1 or 2:1, Crystal

Oscillator-to-3.3V LVPECL / ECL Multiplexer and

is a member of the HiPerClockS™ family of High

Performance Clock Solutions from ICS. The

ICS85357-11

has

4

selectable

crystal

inputs. The device can support 10MHz - 25MHz parallel

resonant crystals by connecting external capacitors between

XTALIN/XTALOUT and ground. The select pins have

internal pulldown resistors and leaving one input

unconnected (pulled to logic low by the internal resistor) will

transform the device into a 2:1 multiplexer. The SEL1 lead is

the most significant line and the binary number applied to

the select pins will select the same numbered data input (i.e.,

00 selects XTALIN0/XTALOUT0).

FEATURES

• 1 differential 3.3V LVPECL output

• 4:1 or 2:1 Crystal Oscillator Multiplexer

• Supports parallel resonant crystals with a frequency range

of 10MHz - 25MHz. The oscillator circuit is optimized for

parallel resonant mode, and will require external capacitance

• Maximum output frequency up to 25MHz

• LVCMOS SEL0 and SEL1 inputs have internal pulldown

resistors

• Part-to-part skew: 150ps (maximum)

• Propagation delay: 2ns (maximum)

• LVPECL mode operating voltage supply range:

V

CC = 3.135V to 3.465V, VEE = 0V

• ECL mode operating voltage supply range:

V

CC = 0V, VEE = -3.135V to -3.465V

• 0°C to 70°C ambient operating temperature

• Industrial temperature information available upon request

BLOCK DIAGRAM

PIN ASSIGNMENT

HiPerClockS™

,&6

VCC

XTALIN0

XTALOUT0

XTALIN1

XTALOUT1

XTALIN2

XTALOUT2

XTALIN3

XTALOUT3

VEE

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

VCC

SEL1

SEL0

VCC

Q0

nQ0

VCC

nc

VEE

ICS85357-11

20-Lead TSSOP

4.40mm x 6.50mm x 0.92mm body package

G Package

Top View

OSC

Q0

nQ0

OSC

00

11

01

10

SEL0

SEL1

XTALIN0

XTALOUT0

XTALIN1

XTALOUT1

XTALIN2

XTALOUT2

XTALIN3

XTALOUT3

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