MPC946FA Motorola, MPC946FA Datasheet

MPC946FA

Manufacturer Part Number

MPC946FA

Description

Low voltage 1:10 CMOS clock driver

Manufacturer

Motorola

Datasheet

1.MPC946FA.pdf (6 pages)

Current page: 1 of 6
Download datasheet (99Kb)

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Low Voltage 1:10 CMOS

Clock Driver

outputs can be configured into a standard fanout buffer or into 1X and

1/2X combinations. The ten outputs were designed and optimized to drive

50 series or parallel terminated transmission lines. With output to output

skews of 350ps the MPC946 is an ideal clock distribution chip for

synchronous systems which need a tight level of skew from a large

number of outputs. For a similar product with more outputs consult the

MPC949 data sheet.

the LOW logic states, the output buffers of the MPC946 are ideal for

driving series terminated transmission lines. More specifically each of the

10 MPC946 outputs can drive two series terminated transmission lines.

With this capability, the MPC946 has an effective fanout of 1:20 in

applications using point–to–point distribution schemes.

a 1X source. The design is fully static, the signals are generated and

retimed inside the chip to ensure minimal skew between the 1X and 1/2X

signals. The device features selectability to allow the user to select the

ratio of 1X outputs to 1/2X outputs.

provide redundant clock sources or the addition of a test clock into the system design. With the TCLK_Sel input pulled HIGH the

TCLK1 input is selected.

Dsel pins will select the 1X output. The MR/Tristate input will reset the internal flip flops and tristate the outputs when it is forced

HIGH.

cost of the device. The 32–lead TQFP has a 7x7mm body size with a conservative 0.8mm pin spacing.

Pentium is a trademark of Intel Corporation.

10/96

Motorola, Inc. 1996

Clock Distribution for Pentium

2 Selectable LVCMOS/LVTTL Clock Inputs

350ps Output to Output Skew

Drives up to 20 Independent Clock Lines

Maximum Input/Output Frequency of 150MHz

Tristatable Outputs

32–Lead TQFP Packaging

3.3V VCC Supply

The MPC946 is a low voltage CMOS, 10 output clock buffer. The 10

With an output impedance of approximately 7 , in both the HIGH and

The MPC946 has the capability of generating 1X and 1/2X signals from

Two independent LVCMOS/LVTTL compatible clock inputs are available. Designers can take advantage of this feature to

All of the control inputs are LVCMOS/LVTTL compatible. The Dsel pins choose between 1X and 1/2X outputs. A LOW on the

The MPC946 is fully 3.3V compatible. The 32–lead TQFP package was chosen to optimize performance, board space and

Systems with PCI

REV 1

1:10 CMOS CLOCK DRIVER

LOW VOLTAGE

MPC946

TQFP PACKAGE

CASE 873A–02

FA SUFFIX

Related parts for MPC946FA

MPC946FA Summary of contents

Page 1

... The MPC946 is fully 3.3V compatible. The 32–lead TQFP package was chosen to optimize performance, board space and cost of the device. The 32–lead TQFP has a 7x7mm body size with a conservative 0.8mm pin spacing. Pentium is a trademark of Intel Corporation. 10/96 Motorola, Inc. 1996 1:10 CMOS CLOCK DRIVER 1 REV 1 ...

Page 2

... Pull Down) Dselc (Int Pull Down) MR/OE Pinout: 32–Lead TQFP (Top View VCCa 25 Qa2 26 GNDa 27 Qa1 28 MPC946 VCCa 29 Qa0 30 GNDa 31 32 MR/ MOTOROLA LOGIC DIAGRAM Qc3 15 GNDc 14 Qc2 13 VCCc 12 Qc1 11 GNDc 10 Qc0 9 VCCc ...

Page 3

... C Unit Condition –20mA 20mA Note Per Output Unit Condition MHz Note 1. ns Note 1 Note 1 max < 100MHz F max < 100MHz F max > 100MHz F max > 100MHz ns Note 2. ns Note 3. ns Note 3. ns 0.8V to 2.0V, Note 3. MOTOROLA ...

Page 4

... Figure 2 shows a step in the waveform, this step is caused by the impedance mismatch seen looking into the driver. The parallel combination of the 43 series resistor plus the output impedance does not match the parallel combination of the MOTOROLA APPLICATIONS INFORMATION line impedances. The voltage wave launched down the two lines will equal +Zo ...

Page 5

... P 0.400 BSC 0.016 BSC 0.150 0.250 0.006 0.010 S 9.000 BSC 0.354 BSC S1 4.500 BSC 0.177 BSC V 9.000 BSC 0.354 BSC V1 4.500 BSC 0.177 BSC W 0.200 REF 0.008 REF X 1.000 REF 0.039 REF MOTOROLA ...

Page 6

... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “ ...

Related keywords

MPC946FA datasheet
MPC946FA data sheet
MPC946FA pdf datasheet
MPC946FA component
MPC946FA part
MPC946FA distributor
MPC946FA RoHS
MPC946FA datasheet download