Page 1
SEMICONDUCTOR TECHNICAL DATA
1
REV 0.1
Motorola, Inc. 1997
2/97
"
!
The MPC941 is a 1:27 low voltage clock distribution chip. The device
features the capability to select either a differential L VPECL or an LVTTL/
LVCMOS compatible input. The 27 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 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.
• 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 V
CC
Supply Voltage
With a low output impedance, in both the HIGH and LOW logic states,
the output buffers of the MPC941 are ideal for driving series terminated
transmission lines. More specifically, each of the 27 MPC941 outputs can
drive two series terminated 50Ω 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.
LOW VOLTAGE
1:27 CLOCK
DISTRIBUTION CHIP
FA SUFFIX
52–LEAD TQFP PACKAGE
CASE 848D–03
Page 2
MPC941
MOTOROLA TIMING SOLUTIONS
BR1333 — Rev 6
2
VCCO
VCCO
Q7
Q6
Q5
GNDO
Q4
Q3
VCCO
Q2
Q1
Q0
GNDO
GNDO
GNDO
Q16
Q17
Q18
VCCO
Q19
Q20
GNDO
Q21
Q22
Q23
VCCO
GNDOQ8Q9
Q10
VCCO
Q11
Q12
GNDO
Q13
Q14
Q15
VCCO
VCCO
VCCO
Q26
Q25
Q24
GNDO
40
41
42
43
44
45
46
47
48
49
50
51
52
25
24
23
22
21
20
19
18
17
16
15
14
12345678910111213
39 38 37 36 35 34 33 32 31 30 29 28 27
26
MPC941
GNDO
GNDI
VCCI
LVCMOS_CLK
LVCMOS_CLKSEL
PECL_CLK
PECL_CLK
VCCO
Pinout: 52–Lead TQFP (Top View)
FUNCTION TABLE
LVCMOS_CLK_Sel Input
0
1
PECL_CLK
LVCMOS_CLK
LOGIC DIAGRAM
LVCMOS_CLK
Q0
PECL_CLK
0
1
LVCMOS_CLK_Sel
PECL_CLK
Q1–Q25
25
Q26
Page 3
MPC941
TIMING SOLUTIONS
BR1333 — Rev 6
3 MOTOROLA
ABSOLUTE MAXIMUM RATINGS*
Symbol Parameter Min Max Unit
V
CC
Supply Voltage –0.3 3.6 V
V
I
Input Voltage –0.3 VDD + 0.3 V
I
IN
Input Current ±20 mA
T
Stor
Storage Temperature Range –40 125 °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 70°C, VCC = 3.3V ±5%)
Symbol Characteristic Min Typ Max Unit Condition
V
IH
Input HIGH Voltage PECL_CLK
Other
V
V
IL
Input LOW Voltage PECL_CLK
Other
V
V
PP
Peak–to–Peak Input Voltage PECL_CLK mV
V
CMR
Common Mode Range PECL_CLK V
V
OH
Output HIGH Voltage V Note NO TAG
V
OL
Output LOW Voltage V Note NO TAG
I
IN
Input Current µA
C
IN
Input Capacitance pF
C
pd
Power Dissipation Capacitance pF
I
CC
Maximum Quiescent Supply Current mA
1. The MPC941 outputs can drive series or parallel terminated 50Ω (or 50Ω to VCC/2) transmission lines on the incident edge.
AC CHARACTERISTICS (TA = 0° to 70°C, VCC = 3.3V ±5%)
Symbol Characteristic Min Typ Max Unit Condition
F
max
Maximum Input Frequency 250 MHz Note NO TAG
t
pd
Propagation Delay PECL_CLK to Q
TTL_CLK to Q
3.0
3.0
ns Note NO TAG
t
sk(o)
Output–to–Output Skew 250 ps Note NO TAG
t
sk(pr)
Part–to–Part Skew PECL_CLK to Q
TTL_CLK to Q
650
650
ps Note NO TAG
t
pwo
Output Pulse Width t
CYCLE
/2
±500
ps Note NO TAG,
Measured at VCC/2
tr, t
f
Output Rise/Fall Time 0.20 1.0 ns 0.8V to 2.0V
2. Driving 50Ω transmission lines.
3. Part–to–part skew at a given temperature and voltage.
Page 4
MPC941
MOTOROLA TIMING SOLUTIONS
BR1333 — Rev 6
4
OUTLINE DIMENSIONS
FA SUFFIX
PLASTIC TQFP PACKAGE
CASE 848D–03
ISSUE C
F
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).
VIEW AA
VIEW AA
2 X R R1
AB
AB
VIEW Y
SECTION AB–AB
ROTATED 90_ CLOCKWISE
DIMAMIN MAX MIN MAX
INCHES
10.00 BSC 0.394 BSC
MILLIMETERS
A1 5.00 BSC 0.197 BSC
B 10.00 BSC 0.394 BSC
B1 5.00 BSC 0.197 BSC
C ––– 1.70 ––– 0.067
C1 0.05 0.20 0.002 0.008
C2 1.30 1.50 0.051 0.059
D 0.20 0.40 0.008 0.016
E 0.45 0.030
F 0.22 0.35 0.009 0.014
G 0.65 BSC
0.75 0.018
0.026 BSC
J 0.07 0.20 0.003 0.008
K 0.50 REF 0.020 REF
R1 0.08 0.20 0.003 0.008
S 12.00 BSC 0.472 BSC
S1 6.00 BSC 0.236 BSC
U 0.09 0.16 0.004 0.006
V 12.00 BSC 0.472 BSC
V1 6.00 BSC 0.236 BSC
W 0.20 REF 0.008 REF
Z 1.00 REF 0.039 REF
C
L
–X–
X=L, M, N
1
13
14
26
27
39
4052
4X TIPS
4X
N0.20 (0.008) H L–M N0.20 (0.008) T L–M
3X VIEW Y
SEATING
PLANE
C
0.10 (0.004) T
4X θ3
4X θ2
S
0.05 (0.002)
0.25 (0.010)
GAGE PLANE
C2
C1
W
K
E
Z
S
L–M
M
0.13 (0.005) N
S
T
PLATING
BASE METAL
D
J
U
B V
B1
A
S
V1
A1
S1
–L–
–N–
–M–
–H–
–T–
θ1
θ
G
θ
1
θ
θ
3
θ
2
07
__
12
513
_
_
_
07
__
0
_
0
_
––– –––
REF
12
_
REF
13
_
5
_
Page 5
MPC941
TIMING SOLUTIONS
BR1333 — Rev 6
5 MOTOROLA
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. “T ypical” 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
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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
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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.
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MPC941/D
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