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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Advance Information Low Voltage 1:18 Clock Distribution Chip
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 50 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.
MPC940
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 VCC Supply Voltage
FA SUFFIX 32-LEAD TQFP PACKAGE CASE 873A-02
With a low output impedance (20), 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 50 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
(c) Motorola, Inc. 1997
1
REV 0.2
MPC940
LOGIC DIAGRAM
PECL_CLK PECL_CLK LVCMOS_CLK LVCMOS_CLK_Sel 0 1 16 Q1-Q16 Q17
Q0
Pinout: 32-Lead TQFP (Top View)
VCCO GND 17 16 15 14 VCCO Q12 Q13 Q14 GNDO Q15 Q16 Q17 Q10 19 Q11 18
Q6
Q7
Q8
24 GNDO Q5 Q4 Q3 VCCO Q2 Q1 Q0 25 26 27 28 29 30 31 32 1
23
22
21
Q9 20
FUNCTION TABLE
LVCMOS_CLK_Sel 0 1 Input PECL_CLK LVCMOS_CLK
MPC940
13 12 11 10 9
2
3
4
5
6
7
8
LVCMOS_CLK_Sel
LVCMOS_CLK
PECL_CLK
PECL_CLK
GNDI
VCCI
MOTOROLA
GNDO
VCCO
2
TIMING SOLUTIONS BR1333 -- Rev 6
MPC940
ABSOLUTE MAXIMUM RATINGS*
Symbol VCC VI IIN TStor Supply Voltage Input Voltage Input Current Storage Temperature Range -40 Parameter Min -0.3 -0.3 Max 3.6 VDD + 0.3 20 125 Unit V V mA C
* 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 (TA = 0 to 70C, VCC = 3.3V 5%)
Symbol VIH VIL VPP VCMR VOH VOL IIN CIN Cpd ICC Characteristic Input HIGH Voltage Input LOW Voltage Peak-to-Peak Input Voltage Common Mode Range Output HIGH Voltage Output LOW Voltage Input Current Input Capacitance Power Dissipation Capacitance Maximum Quiescent Supply Current 8 PECL_CLK Other PECL_CLK Other PECL_CLK PECL_CLK Min 2.135 2.0 1.49 300 VCC-2.0 2.5 0.5 100 4 Typ Max 2.42 3.60 1.825 0.8 1000 VCC-0.6 Unit V V mV V V V A pF pF Per Output IOH = -16mA, Note 1. IOH = 16mA, Note 1. Condition
ICCL 70 mA ICCH 140 1. The MPC940 outputs can drive series or parallel terminated 50 (or 50 to VCC/2) transmission lines on the incident edge.
AC CHARACTERISTICS (TA = 0 to 70C, VCC = 3.3V 5%)
Symbol Fmax tpd tsk(o) tsk(pr) tpwo Characteristic Maximum Input Frequency Propagation Delay Output-to-Output Skew Part-to-Part Skew Output Pulse Width PECL_CLK to Q TTL_CLK to Q 45 800 800 55 PECL_CLK to Q TTL_CLK to Q Min Typ 250 1.7 2.0 150 Max Unit MHz ns ps ps p% Condition Note 1. Note 1. Note 1. Notes 2., 3. Note 1., Measured at VCC/2
tr, tf Output Rise/Fall Time 0.20 1.0 ns 0.8V to 2.0V 1. Driving 50 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
3
MOTOROLA
MPC940
OUTLINE DIMENSIONS
FA SUFFIX TQFP PACKAGE CASE 873A-02 ISSUE A
A A1
32 25
4X
0.20 (0.008) AB T-U Z
1
-T- B B1
8
-U- V P DETAIL Y
17
AE
V1 AE DETAIL Y
9
-Z- 9 S1 S
4X
0.20 (0.008) AC T-U Z
G -AB-
SEATING PLANE
DETAIL AD
-AC-
BASE METAL
N
F
8X
D
M_ R
0.20 (0.008)
M
AC T-U Z
0.10 (0.004) AC
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-. 5. DIMENSIONS S AND V TO BE DETERMINED AT SEATING PLANE -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). 8. MINIMUM SOLDER PLATE THICKNESS SHALL BE 0.0076 (0.0003). 9. EXACT SHAPE OF EACH CORNER MAY VARY FROM DEPICTION. MILLIMETERS MIN MAX 7.000 BSC 3.500 BSC 7.000 BSC 3.500 BSC 1.400 1.600 0.300 0.450 1.350 1.450 0.300 0.400 0.800 BSC 0.050 0.150 0.090 0.200 0.500 0.700 12_ REF 0.090 0.160 0.400 BSC 1_ 5_ 0.150 0.250 9.000 BSC 4.500 BSC 9.000 BSC 4.500 BSC 0.200 REF 1.000 REF INCHES MIN MAX 0.276 BSC 0.138 BSC 0.276 BSC 0.138 BSC 0.055 0.063 0.012 0.018 0.053 0.057 0.012 0.016 0.031 BSC 0.002 0.006 0.004 0.008 0.020 0.028 12_ REF 0.004 0.006 0.016 BSC 1_ 5_ 0.006 0.010 0.354 BSC 0.177 BSC 0.354 BSC 0.177 BSC 0.008 REF 0.039 REF
J
CE
SECTION AE-AE
X DETAIL AD
MOTOROLA
GAUGE PLANE
0.250 (0.010)
H
W
K
Q_
DIM A A1 B B1 C D E F G H J K M N P Q R S S1 V V1 W X
4
TIMING SOLUTIONS BR1333 -- Rev 6
-T-, -U-, -Z-
EE EE EE
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 specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, 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 applications intended 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 or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola 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 are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. 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
MfaxTM: 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
TIMING SOLUTIONS BR1333 -- Rev 6
5
MPC940/D MOTOROLA

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