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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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Low Voltage 1:18 Clock Distribution Chip
The MPC942 is a 1:18 low voltage clock distribution chip with 2.5V or 3.3V LVCMOS output capabilities. The device is offered in two versions; the MPC942C has an LVCMOS input clock while the MPC942P has a LVPECL input clock. The 18 outputs are 2.5V or 3.3V LVCMOS compatible and feature the drive strength to drive 50 series or parallel terminated transmission lines. With output-to-output skews of 200ps, the MPC942 is ideal as a clock distribution chip for the most demanding of synchronous systems. The 2.5V outputs also make the device ideal for supplying clocks for a high performance Pentium IITM microprocessor based design.
MPC942P
LOW VOLTAGE 1:18 CLOCK DISTRIBUTION CHIP
* * * * * *
LVPECL Clock Input 2.5V LVCMOS Outputs for Pentium II Microprocessor Support 200ps Maximum Targeted Output-to-Output Skew Maximum Output Frequency of 250MHz @ 3.3 VCC 32-Lead LQFP Packaging Single 3.3V or 2.5V Supply
FA SUFFIX 32-LEAD LQFP PACKAGE CASE 873A-02
With a low output impedance (12), in both the HIGH and LOW logic states, the output buffers of the MPC942 are ideal for driving series terminated transmission lines. With an output impedance of 12 the MPC942 can drive two series terminated transmission lines from each output. This capability gives the MPC942 an effective fanout of 1:36. The MPC942 provides enough copies of low skew clocks for most high performance synchronous systems.
The differential LVPECL inputs of the MPC942P 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 OE pins will place the outputs into a high impedance state. The OE pin has an internal pullup resistor. The MPC942 is a single supply device. The VCC power pins require either 2.5V or 3.3V. The 32-lead LQFP package was chosen to optimize performance, board space and cost of the device. The 32-lead LQFP has a 7x7mm body size with a conservative 0.8mm pin spacing.
Pentium II is a trademark of Intel Corporation.
02/01
(c) Motorola, Inc. 2001
1
REV 1
MPC942P
LOGIC DIAGRAM MPC942P Block Diagram
Q0 PECL_CLK PECL_CLK Q1:Q16 Q17 OE (Int. Pullup)
FUNCTION TABLE
OE 0 1 Output HIGH IMPEDANCE OUTPUTS ENABLED
Pinout: 32-Lead (Top View)
GND 17 16 15 14 VCC Q12 Q13 Q14 GND Q15 Q16 Q17 13 12 11 10 9 1 2 3 4 5 6 7 8 VCC Min -0.3 -0.3 VCC Q10 19 PECL_CLK Q11 18 VCC Q6 Q7 Q8 Q9 20 PECL_CLK
24 GND Q5 Q4 Q3 VCC Q2 Q1 Q0 25 26 27 28 29 30 31 32
23
22
21
MPC942P
GND
GND
ABSOLUTE MAXIMUM RATING
Symbol VCC VI IIN TStor Supply Voltage Input Voltage Input Current Storage Temperature Range -40 Parameter Max 3.6 VCC + 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.
MOTOROLA
OE
NC 2
TIMING SOLUTIONS DL207 -- Rev 0
MPC942P
DC CHARACTERISTICS (TA = 0 to 70C, VCC = 2.5V 5%)
Symbol VIH VIL VPP VX VOH VOL IIN CIN CPD ZOUT ICC Characteristic Input HIGH Voltage Input LOW Voltage Input Swing PECL_CLK Input Crosspoint PECL_CLK Output HIGH Voltage Output LOW Voltage Input Current Input Capacitance Power Dissipation Capacitance Output Impedance Maximum Quiescent Supply Current 4.0 14 12 0.5 5.0 0.6 VCC-1.0 2.0 0.5 200 Min 2.0 Typ Max VCC 0.8 1.0 VCC-0.6 Unit V V V V V V A pF pF Per Output IOH = -16 mA IOL = 16 mA Condition
W
mA
AC CHARACTERISTICS (TA = 0 to 70C, VCC = 2.5V 5%)
Symbol Fmax tPLH tPHL tsk(o) tsk(pr) tsk(pr) Characteristic Maximum Frequency Propagation Delay Propagation Delay Output-to-Output Skew Part-to-Part Skew Part-to-Part Skew 0.1 1.8 2.0 Min Typ Max 200 4.0 4.3 200 2.2 1.3 1.0 Unit MHz ns ns ps ns ps ns Note 2 Note 1 Condition
tr, tf Output Rise/Fall Time 1. For a specific temperature and voltage, includes output skew. 2. Across temperature and voltage ranges, includes output skew.
TIMING SOLUTIONS DL207 -- Rev 0
3
MOTOROLA
MPC942P
DC CHARACTERISTICS (TA = 0 to 70C, VCC = 3.3V 5%)
Symbol VIH VIL VPP VX VOH VOL IIN CIN CPD ZOUT ICC Characteristic Input HIGH Voltage Input LOW Voltage Input Swing PECL.CLK Input Crosspoint PECL_CLK Output HIGH Voltage Output LOW Voltage Input Current Input Capacitance Power Dissipation Capacitance Output Impedance Maximum Quiescent Supply Current 4.0 14 12 0.5 5.0 0.6 VCC-1.0 2.4 0.6 200 Min 2.4 Typ Max VCC 0.8 1.0 VCC-0.6 Unit V V V V V V A pF pF Per Output IOH = -20 mA IOL = 20 mA Condition
W
mA
AC CHARACTERISTICS (TA = 0 to 70C, VCC = 3.3V 5%)
Symbol Fmax tPLH tPHL tsk(o) tsk(pr) tsk(pr) Characteristic Maximum Frequency Propagation Delay Propagation Delay Output-to-Output Skew Part-to-Part Skew Part-to-Part Skew 0.1 1.5 1.5 Min Typ Max 250 3.2 3.6 200 1.7 1.0 1.0 Unit MHz ns ns ps ns ps ns Note 2 Note 1 Condition
tr, tf Output Rise/Fall Time 1. For a specific temperature and voltage, includes output skew. 2. Across temperature and voltage ranges, includes output skew.
MOTOROLA
4
TIMING SOLUTIONS DL207 -- Rev 0
MPC942P
OUTLINE DIMENSIONS
-T-, -U-, -Z- AE P
1
FA SUFFIX LQFP PACKAGE CASE 873A-02 ISSUE A
A A1
32 25
4X
0.20 (0.008) AB T-U Z
-T- B B1
8
-U- AE V DETAIL Y
17
DETAIL Y
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
V1
9
-Z- 9 S1 S
4X
0.20 (0.008) AC T-U Z
G -AB-
SEATING PLANE
DETAIL AD
-AC-
BASE METAL
N
AC T-U Z
0.10 (0.004) AC
F
8X
M_ R
CE
SECTION AE-AE
X DETAIL AD
TIMING SOLUTIONS DL207 -- Rev 0
GAUGE PLANE
0.250 (0.010)
H
W
K
Q_
5
EE EE EE
J
D
DIM A A1 B B1 C D E F G H J K M N P Q R S S1 V V1 W X
0.20 (0.008)
M
MOTOROLA
MPC942P
NOTES
MOTOROLA
6
TIMING SOLUTIONS DL207 -- Rev 0
MPC942P
NOTES
TIMING SOLUTIONS DL207 -- Rev 0
7
MOTOROLA
MPC942P
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HOME PAGE: http://www.motorola.com/semiconductors/
MOTOROLA
8
TIMING SOLUTIONS MPC942P/D0 DL207 -- Rev

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