MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Order this document

by MPC905/D

1

REV 2

01/01

1:6 PCI Clock Generator/

Fanout Buffer

The MPC905 is a six output clock generation device targeted to

provide the clocks required in a 3.3V or 5.0V PCI environment. The

device operates from a 3.3V supply and can interface to either a TTL

input or an external crystal. The inputs to the device can be driven with

5.0V when the VCC is at 3.3V. The outputs of the MPC905 meet all of the

specifications of the PCI standard.

The MPC905 device is targeted for PCI bus or processor bus

environments with up to 12 clock loads. Each of the six outputs on the

MPC905 can drive two series terminated 50

Ω transmission lines. This

capability effectively makes the MPC905 a 1:12 fanout buffer.

The MPC905 offers two synchronous enable inputs to allow users

flexibility in developing power management features for their designs.

Both enable signals are active HIGH inputs. A logic ‘0’ on the Enable1 will

pull outputs 0 to 4 into the logic ‘0’ state. A logic ‘1’ on the Enable1 input

will result in outputs 0 to 4 to be toggling. A logic ‘0’ on Enable2 will cause

output BLK5 to a logic ‘0’ state, whereas a logic ‘1’ on Enable2 will cause

output BLK5 to toggle. The oscillator remains on.

The Enable2 input can be used to disable any high power device for system power savings during periods of inactivity. Both

enable inputs are synchronized internal to the chip so that the output disabling will happen only when the outputs are already

LOW. This feature guarantees no runt pulses will be generated during enabling and disabling.

BCLK0

BCLK1

BCLK2

BCLK3

BCLK4

BCLK5

XTAL_IN

XTAL_OUT

Enable1

Enable2

GND (3)

VDD (3)

Pinout: 16-Lead Plastic Package (Top View)

16

1

15

2

14

3

13

4

XTAL_IN

Enable1

BCLK5

VDD3

XTAL_OUT

Enable2

GND1

BCLK0

12

5

11

6

10

7

9

8

BCLK4

GND3

BCLK3

VDD2

VDD1

BCLK1

GND2

BCLK2

SYNCHRONIZE

SYNCHRONIZE

1:6 PCI

CLOCK GENERATOR/

FANOUT BUFFER

D SUFFIX

PLASTIC SOIC PACKAGE

CASE 751B-05

1

16

MPC905

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

DATA SHEET

MPC905

IDT™ 1:6 PCI Clock Generator/Fanout Buffer

Freescale Timing Solutions Organization has been acquired by Integrated Device Technology, Inc

MPC905

1

1:6 PCI Clock Generator/Fanout

Buffer