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©2021 Renesas Electronics Corporation

R31DS0073EU0200 July 30, 2021

Description

The 831742I is a high-performance, differential HCSL clock/data

multiplexer and fanout buffer. The device is designed for the

multiplexing and fanout of high-frequency clock and data signals.

The device has four differential, selectable clock/data inputs. The

selected input signal is distributed to two low-skew differential HCSL

outputs. Each input pair accepts HCSL, LVDS and LVPECL levels.

The 831742I is characterized to operate from a 3.3V power supply.

Guaranteed input, output-to-output and part-to-part skew

characteristics make the 831742I ideal for those clock and data

distribution applications demanding well-defined performance and

repeatability. The 831742I supports the clock multiplexing and

distribution of PCI Express (2.5Gb/s), Gen2 (5Gb/s), Gen3 (8Gb/s)

and Gen4 (16Gb/s) clock signals.

Features

• 4:2 differential clock/data multiplexer with fanout

• Four selectable, differential input pairs

• Each differential input pair can accept the following levels: HCSL,

LVDS and LVPECL

• Two differential HCSL output pairs

• Maximum input/output clock frequency: 700MHz

• Maximum input/output data rate: 1400Mb/s (NRZ)

• LVCMOS interface levels for all control inputs

• PCI Express (2.5Gb/s), Gen2 (5 Gb/s), Gen3 (8 Gb/s) and Gen4 (16

Gb/s) clock jitter compliant

• Input skew: 110ps max

• Part-to-part skew: 225ps max

• Full 3.3V supply voltage

• Available in lead-free (RoHS 6)

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

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

GND

CLK0

nCLK0

VDD

CLK1

nCLK1

CLK2

nCLK2

GND

CLK3

nCLK3

VDD

SEL1

IREF

VDD

SEL0

QB

nQB

nQA

QA

VDD

GND

nOEB

nOEA

Block Diagram

QA

nQA

IREF

CLK0

nCLK0

CLK1

nCLK1

CLK3

nCLK3 Pullup/down

Pulldown

Pulldown

Pulldown

Pullup

Pullup

Pullup/down

Pulldown

Pullup/down

Pulldown

Pullup/down

Pulldown

0 0

0 1

1 0

1 1

nQ

Q

CLK

nCLK

nOEA

Pin Assignment

831742AGI

24-Lead TSSOP

4.4mm x 7.8mm x 0.925mm package body

G Package

Top View

831742I

Datasheet

4:2 Differential Clock/Data

Multiplexer