MPC940 [MOTOROLA]

LOW VOLTAGE 1:18 CLOCK DISTRIBUTION CHIP; 低电压1:18时钟分配芯片


型号：	MPC940
厂家：	MOTOROLA
描述：	LOW VOLTAGE 1:18 CLOCK DISTRIBUTION CHIP 低电压1:18时钟分配芯片时钟
文件：	总5页 (文件大小：95K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SEMICONDUCTOR TECHNICAL DATA

The MPC940 is a 1:18 low voltage clock distribution chip. The device

features the capability to select either a differential LVPECL or an LVTTL/

LVCMOS compatible input. The 18 outputs are LVCMOS or LVTTL

compatible and feature the drive strength to drive 50Ω series or parallel

terminated transmission lines. With output–to–output skews of 150ps, the

MPC940 is ideal as a clock distribution chip for the most demanding of

synchronous systems. For a similar product with a larger number of

outputs, please consult the MPC941 data sheet.

LOW VOLTAGE

1:18 CLOCK

DISTRIBUTION CHIP

• LVPECL or LVCMOS/LVTTL Clock Input

• 150ps Maximum Targeted Output–to–Output Skew

• Drives Up to 36 Independent Clock Lines

• Maximum Output Frequency of 250MHz

• 32–Lead TQFP Packaging

• 3.3V V

Supply Voltage

FA SUFFIX

32–LEAD TQFP PACKAGE

CASE 873A–02

With a low output impedance (≈20Ω), in both the HIGH and LOW logic

states, the output buffers of the MPC940 are ideal for driving series

terminated transmission lines. More specifically, each of the 18 MPC940

outputs can drive two series terminated 50Ω transmission lines. With this

capability, the MPC940 has an effective fanout of 1:36 in applications

where each line drives a single load. With this level of fanout, the

MPC940 provides enough copies of low skew clocks for most high

performance synchronous systems.

The differential LVPECL inputs of the MPC940 allow the device to interface directly with a LVPECL fanout buffer like the

MC100EP111 to build very wide clock fanout trees or to couple to a high frequency clock source. The LVCMOS/LVTTL input

provides a more standard interface for applications requiring only a single clock distribution chip at relatively low frequencies. In

addition, the two clock sources can be used to provide for a test clock interface as well as the primary system clock. A logic HIGH

on the LVCMOS_CLK_Sel pin will select the TTL level clock input.

The MPC940 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.

This document contains information on a new product. Specifications and information herein are subject to

change without notice.

6/97

REV 0.2

Motorola, Inc. 1997

MPC940

LOGIC DIAGRAM

PECL_CLK

LVCMOS_CLK

Q1–Q16

Q17

LVCMOS_CLK_Sel

Pinout: 32–Lead TQFP (Top View)

GNDO

VCCO

Q12

FUNCTION TABLE

LVCMOS_CLK_Sel

Q13

Input

Q14

PECL_CLK

LVCMOS_CLK

MPC940

VCCO

GNDO

Q15

Q16

Q17

MOTOROLA

TIMING SOLUTIONS

BR1333 — Rev 6

MPC940

ABSOLUTE MAXIMUM RATINGS*

Symbol

Parameter

Min

–0.3

Max

Unit

Supply Voltage

Input Voltage

Input Current

3.6

+ 0.3

±20

°C

Stor

Storage Temperature Range

–40

125

Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those

indicated may adversely affect device reliability. Functional operation under absolute–maximum–rated conditions is not implied.

DC CHARACTERISTICS (T = 0° to 70°C, V

= 3.3V ±5%)

Symbol

Characteristic

Min

Typ

Max

Unit

Condition

Input HIGH Voltage

PECL_CLK

2.135

2.0

2.42

3.60

Other

Input LOW Voltage

PECL_CLK

Other

1.49

1.825

0.8

Peak–to–Peak Input Voltage

Common Mode Range

Output HIGH Voltage

Output LOW Voltage

Input Current

PECL_CLK

300

1000

–2.0

2.5

–0.6

CMR

= –16mA, Note 1.

= 16mA, Note 1.

0.5

±100

µA

Input Capacitance

Power Dissipation Capacitance

Per Output

Maximum Quiescent Supply Current

140

CCL

CCH

1. The MPC940 outputs can drive series or parallel terminated 50Ω (or 50Ω to V /2) transmission lines on the incident edge.

AC CHARACTERISTICS (T = 0° to 70°C, V

= 3.3V ±5%)

Symbol

Characteristic

Maximum Input Frequency

Propagation Delay

Min

Typ

Max

Unit

MHz

Condition

Note 1.

250

max

PECL_CLK to Q

TTL_CLK to Q

1.7

2.0

Note 1.

Output–to–Output Skew

Part–to–Part Skew

150

Note 1.

sk(o)

PECL_CLK to Q

TTL_CLK to Q

800

Notes 2., 3.

sk(pr)

Output Pulse Width

Note 1.,

Measured at V /2

pwo

t , t

r f

Output Rise/Fall Time

0.20

1.0

0.8V to 2.0V

1. Driving 50Ω transmission lines

2. Part–to–part skew at a given temperature and voltage

3. Final specification limits will be determined from matrix lot material. 800ps is the “best estimate” based on initial material and experience with

previous products.

TIMING SOLUTIONS

BR1333 — Rev 6

MOTOROLA

MPC940

OUTLINE DIMENSIONS

FA SUFFIX

TQFP PACKAGE

CASE 873A–02

ISSUE A

0.20 (0.008) AB T–U

–U–

–T–

DETAIL Y

–Z–

DETAIL Y

0.20 (0.008) AC T–U

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DATUM PLANE –AB– IS LOCATED AT BOTTOM OF

LEAD AND IS COINCIDENT WITH THE LEAD

WHERE THE LEAD EXITS THE PLASTIC BODY AT

THE BOTTOM OF THE PARTING LINE.

4. DATUMS –T–, –U–, AND –Z– TO BE DETERMINED

AT DATUM PLANE –AB–.

DETAIL AD

5. DIMENSIONS S AND V TO BE DETERMINED AT

SEATING PLANE –AC–.

–AB–

–AC–

6. DIMENSIONS A AND B DO NOT INCLUDE MOLD

PROTRUSION. ALLOWABLE PROTRUSION IS

0.250 (0.010) PER SIDE. DIMENSIONS A AND B

DO INCLUDE MOLD MISMATCH AND ARE

DETERMINED AT DATUM PLANE –AB–.

7. DIMENSION D DOES NOT INCLUDE DAMBAR

PROTRUSION. DAMBAR PROTRUSION SHALL

NOT CAUSE THE D DIMENSION TO EXCEED

0.520 (0.020).

SEATING

PLANE

0.10 (0.004) AC

BASE

METAL

8. MINIMUM SOLDER PLATE THICKNESS SHALL BE

0.0076 (0.0003).

9. EXACT SHAPE OF EACH CORNER MAY VARY

FROM DEPICTION.

8X M

MILLIMETERS

MIN MAX

7.000 BSC

3.500 BSC

7.000 BSC

3.500 BSC

INCHES

MIN MAX

0.276 BSC

0.138 BSC

0.276 BSC

0.138 BSC

DIM

SECTION AE–AE

1.400

1.600

0.450

1.450

0.400

0.055

0.063

0.018

0.057

0.016

0.300

1.350

0.300

0.012

0.053

0.012

0.800 BSC

0.031 BSC

0.050

0.090

0.500

0.150

0.200

0.700

0.002

0.004

0.020

0.006

0.008

0.028

12 REF

DETAIL AD

0.090

0.160

0.004

0.006

0.400 BSC

0.016 BSC

0.150

0.250

0.006

0.010

9.000 BSC

0.354 BSC

4.500 BSC

9.000 BSC

4.500 BSC

0.200 REF

1.000 REF

0.177 BSC

0.354 BSC

0.177 BSC

0.008 REF

0.039 REF

MOTOROLA

TIMING SOLUTIONS

BR1333 — Rev 6

MPC940

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

specificallydisclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola

datasheetsand/orspecificationscananddovaryindifferentapplicationsandactualperformancemayvaryovertime. Alloperatingparameters,including“Typicals”

must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of

others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other

applicationsintended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury

ordeathmayoccur. ShouldBuyerpurchaseoruseMotorolaproductsforanysuchunintendedorunauthorizedapplication,BuyershallindemnifyandholdMotorola

and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees

arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that

Motorola was negligent regarding the design or manufacture of the part. Motorola and

Opportunity/Affirmative Action Employer.

are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal

Mfax is a trademark of Motorola, Inc.

How to reach us:

USA/EUROPE/Locations Not Listed: Motorola Literature Distribution;

P.O. Box 5405, Denver, Colorado 80217. 303–675–2140 or 1–800–441–2447

JAPAN: Nippon Motorola Ltd.: SPD, Strategic Planning Office, 4–32–1,

Nishi–Gotanda, Shinagawa–ku, Tokyo 141, Japan. 81–3–5487–8488

Mfax : RMFAX0@email.sps.mot.com – TOUCHTONE 602–244–6609

ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,

– US & Canada ONLY 1–800–774–1848 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298

INTERNET: http://motorola.com/sps

MPC940/D

MOTOROLA

◊

TIMING SOLUTIONS

BR1333 — Rev 6

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