DATA SHEET

2:1, Differential-to-3.3V Dual

LVPECL/ECL Clock Multiplexer

85356

85356 Rev C 1/5/15

1

©2015 Integrated Device Technology, Inc.

General Description

The 85356 is a dual 2:1 Differential-to-LVPECL Multiplexer. The

device has both common select and individual select inputs. When

COM_SEL is logic High, the CLKxx input pairs will be passed to the

output. When COM_SEL is logic Low, the output is determined by

the setting of the SEL0 pin for channel 0 and the SEL1 pin for

Channel 1.

The differential input has a common mode range that can accept

most differential input types such as LVPECL, LVDS, LVHSTL,

SSTL, and HCSL. The 85356 can therefore be used as a differential

translator to translate almost any differential input type to LVPECL. It

can also be used in ECL mode by setting V

CC = 0V and VEE to -3.0V

to - 3.8V.

The 85356 adds negligible jitter to the input clock and can operate at

high frequencies in excess of 900MHz thus making

it ideal for use in demanding applications such as SONET,

Fibre Channel, 1 Gigabit/10 Gigabit Ethernet.

Features

• High speed differential muliplexer. The device can be configured

as a 2:1 multiplexer

• Dual 3.3V LVPECL outputs

• Selectable differential CLKx/nCLKx input pairs

• Differential CLKx/nCLKx pairs can accept the following interface

levels: LVPECL, LVDS, LVHSTL, HCSL, SSTL

• Output frequency: 900MHz (typical)

• Translates any single-ended input signal to 3.3V LVPECL levels

with resistor bias on nCLKx input

• Output skew: 75ps (typical)

• Propagation delay: 1.15ns (typical)

• LVPECL mode operating voltage supply range:

VCC = 3V to 3.8V, VEE = 0V

• ECL mode operating voltage supply range:

VCC = 0V, VEE = -3V to -3.8V

• -40°C to 85°C ambient operating temperature

• Available in lead-free (RoHS 6) package

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

CLK1B

nc

nCLK1A

CLK1A

nCLK0B

CLK0B

nc

nCLK0A

CLK0A

nCLK1B

VCC

Q0

nQ0

SEL0

COM_SEL

SEL1

VCC

Q1

nQ1

VEE

Pin Assignment

85356

20-Lead SOIC

7.5mm x 12.8mm x 2.3mm package body

M Package

Top View

85356

20-Lead TSSOP

6.5mm x 4.4mm x 0.92mm package body

G Package

Top View

Block Diagram

Q0

nQ0

COM_SEL

SEL0

SEL1

CLK0A

nCLK0A

0

1

Pulldown

Pullup

Pullup

Pulldown

CLK0B

CLK0B

Pulldown

Pullup

Q1

nQ1

CLK1A

nCLK1A

0

1

Pulldown

Pullup

CLK1B

CLK1B

Pulldown

Pullup

Pullup