© 2014 Exar Corporation

XR81411

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exar.com/XR81411

Rev 1A

Pin Assignments

Pin No.

Pin Name

Type

Description

1

Q1

Output

Channel 1 Positive Clock Output

2Q1

Output

Channel 1Inverted Clock Output

3

VDD1C

Power

Channel 1 Core Supply Voltage

4

XTAL_IN

Input

Crystal oscillator input.

5

XTAL_OUT

Output

Crystal oscillator output (external reference input)

6

FSEL1_4

Input

(900K pull-dwn)

Channel 4 Output frequency select 1, MSB (LVCMOS/LVTTL input).

7

FSEL0_4

Input

(900K pull-dwn)

Channel 4 Output frequency select 0, LSB (LVCMOS/LVTTL input).

8

NC

No Connection

Do not connect.

9

GND

GND

Ground.

10

OE_4

Input

(900K pull-up)

Channel 4 Output enable - LVCMOS/LVTTL active high input.

Outputs are enabled when OE = high. Outputs are disabled when OE = low.

11

VDD4C

Power

Channel 4 Core Supply Voltage. )

12

Q4

Output

Channel 4 Positive Clock Output.

13

Q4

Output

Channel 4 Inverted Clock Output.

14

VDD4D

Power

Channel 4 Driver Supply Voltage.)

15

FSEL1_3

Input

(900K pull-dwn)

Channel 3 Output frequency select 1, MSB (LVCMOS/LVTTL input).

16

FSEL0_3

Input

(900K pull-dwn)

Channel 3 Output frequency select 0, LSB (LVCMOS/LVTTL input).

17

NC

No Connection

Do not connect.

18

GND

GND

Ground.

19

OE_3

Input

(900K pull-up)

Channel 3 Output enable - LVCMOS/LVTTL active high input.

Outputs are enabled when OE = high. Outputs are disabled when OE = low.

20

VDD3

Power

Channel 3 Core and Driver Supply Voltage.

21

Q3

Output

Channel 3 Positive Clock Output.

22

Q3

Output

Channel 3 Inverted Output.

23

FSEL1_2

Input

(900K pull-dwn)

Channel 2 Output frequency select 1, MSB (LVCMOS/LVTTL input).

24

FSEL0_2

Input

(900K pull-dwn)

Channel 2 Output frequency select 0, LSB (LVCMOS/LVTTL input).

25

NC

No Connection

Do not connect.

26

OE_2

Input

(900K pull-up)

Channel 2 Output enable - LVCMOS/LVTTL active high input.

Outputs are enabled when OE = high. Outputs are disabled when OE = low.

27

GND

GND

Ground.