IDT®

Low Power Clock for Intel Atom®-Based Systems

1561C — 08/24/11

9LPRS436C

Low Power Clock for Intel Atom

®-Based Systems

3

Pin Description

PIN #

PIN NAME

TYPE

DESCRIPTION

1

**FS3/12_288M_2x

I/O

Frequency select latch input pin / 12.288MHz output, 3.3V

2

VDD12_288

PWR

Power for 12.288MHz PLL and output buffer, nominal 3.3V.

3PEREQ1#

IN

Real-time input pin that controls SATACLK and PCIEXCLK outputs that are

selected through the SMBus. 1 = selected outputs are disabled, 0 = selected

outputs are enabled.

4PEREQ2#

IN

Real-time input pin that controls SATACLK and PCIEXCLK outputs that are

selected through the SMBus. 1 = selected outputs are disabled, 0 = selected

outputs are enabled.

5

**FS4/PCICLK0_2x

I/O

Frequency select latch input pin / 3.3V PCI clock output.

6

GND

PWR

Ground pin.

7

VDDPCI

PWR

Power supply for PCI clocks, nominal 3.3V

8

**ITP_EN/PCICLK_F0_2x

I/O

ITP Enable Latched Input/Free Running PCI clock output.

ITP_Enable Selects the functionality of the CPU_ITP/SRC output as follows:

1 = CPU_ITP output

0 = SRC output

9PEREQ3#

IN

Real-time input pin that controls PCIEXCLK outputs that are selected through

the SMBus. 1 = selected outputs are disabled, 0 = selected outputs are

enabled.

10

*SEL12_48#/12_48MHz_2x

I/O

Latched select input for 12/48MHz output. 1=12MHz, 0=48MHz. 12/48MHz

clock output.

11

VDD

PWR

Power supply, nominal 3.3V

12

FSLA/USB48_2x

I/O

3.3V tolerant input for CPU frequency selection. Low voltage threshold inputs,

see input electrical characteristics for Vil_FS and Vih_FS values. / 48.00MHz

USB clock

13

GND

PWR

Ground pin.

14

DOTT_96MHzLR

OUT

True clock of low power differential pair for 96.00MHz DOT clock. No 50ohm

to GND needed. No Rs needed.

15

DOTC_96MHzLR

OUT

Complementary clock of low power differential pair for 96.00MHz DOT clock.

No 50ohm resistor to GND needed. No Rs needed.

16

FSLB

IN

3.3V tolerant input for CPU frequency selection. Refer to input electrical

characteristics for Vil_FS and Vih_FS values.

17

GNDSATA

PWR

Ground pin for the SATA outputs

18

SATAT_LR/PCIeT_LR3

OUT

True clock of differential SATA pair. / True clock of differential PCI-Express pair

- selectable by FS(4:3) ; both are 0.8V differential push pull outputs with

integrated 33ohm series resistor.

19

SATAC_LR/PCIeC_LR3

OUT

Complementary clock of differential SATA pair. / Complementary clock of

differential PCI-Express pair - selectable by FS(4:3); both are 0.8V differential

push pull outputs with integrated 33ohm series resistor.

20

VDDSATA

PWR

Supply for SATA clocks, 3.3V nominal

21

PCIeT_LR0

OUT

True clock of 0.8V differential push-pull PCI_Express pair with integrated

33ohm series resistor

22

PCIeC_LR0

OUT

Complementary clock of 0.8V differential push-pull PCI_Express pair with

integrated 33ohm series resistor

23

PCIeT_LR1

OUT

True clock of 0.8V differential push-pull PCI_Express pair with integrated

33ohm series resistor

24

PCIeC_LR1

OUT

Complementary clock of 0.8V differential push-pull PCI_Express pair with

integrated 33ohm series resistor