REVISION B 07/13/15

3

PROGRAMMABLE CLOCK GENERATOR

5P49V5925 DATASHEET

Table 1: Pin Descriptions

Number

Name

Type

Description

1

CLKIN

Input

Internal

Pull-down

Differential clock input. Weak 100kohms internal pull-down.

2

CLKINB

Input

Internal

Pull-down

Complementary differential clock input. Weak 100kohms internal pull-down.

3

XOUT

Input

Crystal Oscillator interface output.

4

XIN/REF

Input

Crystal Oscillator interface input, or single-ended LVCMOS clock input. Ensure that

the input voltage is 1.2V max.Refer to the section “Overdriving the XIN/REF

Interface”.

Power

have the same voltage applied.

6

CLKSEL

Input

Internal

Pull-down

Input clock select. Selects the active input reference source in manual switchover

mode.

0 = XIN/REF, XOUT (default)

1 = CLKIN, CLKINB

CLKSEL Polarity can be changed by I2C programming as shown in Table 4.

7

SD/OE

Input

Internal

Pull-down

Enables/disables the outputs (OE) or powers down the chip (SD). The SH bit

controls the configuration of the SD/OE pin. The SH bit needs to be high for SD/OE

pin to be configured as SD. The SP bit (0x02) controls the polarity of the signal to be

either active HIGH or LOW only when pin is configured as OE (Default is active

LOW.) Weak internal pull down resistor. When configured as SD, device is shut

down and the single-ended LVCMOS outputs are driven low. When configured as

OE, and outputs are disabled, the outputs can be selected to be tri-stated or driven

high/low, depending on the programming bits as shown in the SD/OE Pin Function

Truth table.

8

SEL1/SDA

Input

Internal

Pull-down

internal pull down resistor.

9

SEL0/SCL

Input

Internal

Pull-down

internal pull down resistor.

10

Power

Output power supply. Connect to 1.8 to 3.3V. Sets output voltage levels for OUT4.

11

OUT4

Output

Output Clock 4. Please refer to the Output Drivers section for more details.

12

NC

–

No connect.

13

NC

–

No connect.

14

OUT3

Output

Output Clock 3. Please refer to the Output Drivers section for more details.

15

Power

Output power supply. Connect to 1.8 to 3.3V. Sets output voltage levels for OUT3.

16

NC

–

No connect.

17

OUT2

Output

Output Clock 2. Please refer to the Output Drivers section for more details.

18

Power

Output power supply. Connect to 1.8 to 3.3V. Sets output voltage levels for OUT2.

19

NC

–

No connect.

20

OUT1

Output

Output Clock 1. Please refer to the Output Drivers section for more details.

21

Power

Output power supply. Connect to 1.8 to 3.3V. Sets output voltage levels for OUT1.

22

Power

have the same voltage applied.