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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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Low Voltage 1:27 Clock Distribution Chip
The MPC941 is a 1:27 low voltage clock distribution chip. The device features the capability to select either a differential LVPECL or an LVTTL/ LVCMOS compatible input. The 27 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 250ps, the MPC941 is ideal as a clock distribution chip for the most demanding of synchronous systems. For a similar product with a smaller number of outputs, please consult the MPC940 data sheet.
MPC941
LOW VOLTAGE 1:27 CLOCK DISTRIBUTION CHIP
* * * * * * *
LVPECL or LVCMOS/LVTTL Clock Input 250ps Maximum Targeted Output-to-Output Skew Drives Up to 54 Independent Clock Lines Maximum Output Frequency of 250MHz High Impedance Output Enable 52-Lead TQFP Packaging 3.3V VCC Supply Voltage
FA SUFFIX
With a low output impedance, in both the HIGH and LOW logic states, 52-LEAD TQFP PACKAGE the output buffers of the MPC941 are ideal for driving series terminated CASE 848D-03 transmission lines. More specifically, each of the 27 MPC941 outputs can drive two series terminated 50 transmission lines. With this capability, the MPC941 has an effective fanout of 1:54 in applications where each line drives a single load. With this level of fanout, the MPC941 provides enough copies of low skew clocks for most high performance synchronous systems. The differential LVPECL inputs of the MPC941 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 MPC941 is fully 3.3V compatible. The 52-lead TQFP package was chosen to optimize performance, board space and cost of the device. The 52-lead TQFP has a 10x10mm body size with a conservative 0.65mm pin spacing.
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice. 2/97
(c) Motorola, Inc. 1997
1
REV 0.1
MPC941
LOGIC DIAGRAM
PECL_CLK PECL_CLK LVCMOS_CLK LVCMOS_CLK_Sel 0 1 25 Q1-Q25 Q26
Q0
Pinout: 52-Lead TQFP (Top View)
GNDO GNDO VCCO VCCO VCCO
26 25 24 23 22 21
Q10
Q12
Q13
Q14
VCCO VCCO Q7 Q6 Q5 GNDO Q4 Q3 VCCO Q2 Q1 Q0 GNDO
40 41 42 43 44 45 46 47 48 49 50 51 52
39 38 37 36
35 34 33 32 31 30 29 28 27
Q15
Q11
Q8
Q9
GNDO GNDO Q16 Q17 Q18 VCCO Q19 Q20 GNDO Q21 Q22 Q23 VCCO
MPC941
20 19 18 17 16 15 14
1
2
3
4
5
6
7
8
9
10
11
12 13
LVCMOS_CLKSEL
LVCMOS_CLK
PECL_CLK
PECL_CLK
VCCI VCCO
GNDI
GNDO
VCCO
FUNCTION TABLE
LVCMOS_CLK_Sel 0 1 Input PECL_CLK LVCMOS_CLK
MOTOROLA
2
GNDO
Q26
Q25
Q24
TIMING SOLUTIONS BR1333 -- Rev 6
MPC941
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 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 PECL_CLK Other PECL_CLK Other PECL_CLK PECL_CLK Min Typ Max Unit V V mV V V V A pF pF Note NO TAG Note NO TAG Condition
ICC Maximum Quiescent Supply Current mA 1. The MPC941 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 0.20 PECL_CLK to Q TTL_CLK to Q PECL_CLK to Q TTL_CLK to Q Min Typ 250 3.0 3.0 250 650 650 tCYCLE/2 500 1.0 Max Unit MHz ns ps ps ps ns Condition Note NO TAG Note NO TAG Note NO TAG Note NO TAG Note NO TAG, Measured at VCC/2 0.8V to 2.0V
tr, tf Output Rise/Fall Time 2. Driving 50 transmission lines. 3. Part-to-part skew at a given temperature and voltage.
TIMING SOLUTIONS BR1333 -- Rev 6
3
MOTOROLA
MPC941
OUTLINE DIMENSIONS
FA SUFFIX PLASTIC TQFP PACKAGE CASE 848D-03 ISSUE C
4X 4X TIPS
0.20 (0.008) H L-M N
0.20 (0.008) T L-M N C L
39
-X- X=L, M, N
52 1
40
AB AB -M- B V VIEW Y
G
3X VIEW
Y
-L-
B1
13 14 26 27
PLATING
F
BASE METAL
V1 J
A1 S1 A S
-N-
0.13 (0.005)
SECTION AB-AB
ROTATED 90_ CLOCKWISE NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DATUM PLANE -H- 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 -L-, -M- AND -N- TO BE DETERMINED AT DATUM PLANE -H-. 5. DIMENSIONS S AND V TO BE DETERMINED AT SEATING PLANE -T-. 6. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. ALLOWABLE PROTRUSION IS 0.25 (0.010) PER SIDE. DIMENSIONS A AND B DO INCLUDE MOLD MISMATCH AND ARE DETERMINED AT DATUM PLANE -H-. 7. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. DAMBAR PROTRUSION SHALL NOT CAUSE THE LEAD WIDTH TO EXCEED 0.46 (0.018). MINIMUM SPACE BETWEEN PROTRUSION AND ADJACENT LEAD OR PROTRUSION 0.07 (0.003). MILLIMETERS MIN MAX 10.00 BSC 5.00 BSC 10.00 BSC 5.00 BSC --- 1.70 0.05 0.20 1.30 1.50 0.20 0.40 0.45 0.75 0.22 0.35 0.65 BSC 0.07 0.20 0.50 REF 0.08 0.20 12.00 BSC 6.00 BSC 0.09 0.16 12.00 BSC 6.00 BSC 0.20 REF 1.00 REF 0_ 7_ --- 0_ 12 _ REF 5_ 13 _ INCHES MIN MAX 0.394 BSC 0.197 BSC 0.394 BSC 0.197 BSC --- 0.067 0.002 0.008 0.051 0.059 0.008 0.016 0.018 0.030 0.009 0.014 0.026 BSC 0.003 0.008 0.020 REF 0.003 0.008 0.472 BSC 0.236 BSC 0.004 0.006 0.472 BSC 0.236 BSC 0.008 REF 0.039 REF 0_ 7_ --- 0_ 12 _ REF 13 _ 5_
C -H- -T-
SEATING PLANE
4X
2 0.10 (0.004) T
4X
3 VIEW AA
0.05 (0.002)
S
W 1 C2
2XR
R1
0.25 (0.010)
GAGE PLANE
K C1 E Z VIEW AA
DIM A A1 B B1 C C1 C2 D E F G J K R1 S S1 U V V1 W Z 1 2 3
MOTOROLA
4
CCCC EEEE CCCC EEEE
M
U
D T L-M
S
N
S
TIMING SOLUTIONS BR1333 -- Rev 6
MPC941
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. 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 MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 602-244-6609 INTERNET: http://www.mot.com/sps/
JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 81-3-3521-8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298
TIMING SOLUTIONS BR1333 -- Rev 6
5
MPC941/D MOTOROLA

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