Low Voltage, 1:18 Clock Distribution Chip
MPC942C
DATASHEET
OBSOLETE
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
II microprocessor based design.
• LVCMOS/LVTTL Clock Input
• 2.5V LVCMOS Outputs for Pentium II Microprocessor Support
• 150ps Maximum Targeted Output-to-Output Skew
• Maximum Output Frequency of 250MHz @ 3.3 V
CC
• 32-Lead TQFP Packaging
• Single 3.3V or 2.5V Supply
•
For Functional replacement use 83940DYLF
MPC942C
LOW VOLTAGE
1:18 CLOCK
DISTRIBUTION CHIP
AC SUFFIX
32-LEAD TQFP PACKAGE
Pb-FREE PACKAGE
CASE 873A-03
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 LVCMOS/LVTTL input of the MPC942C provides a more standard LVCMOS interface. 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 V
CC
power pins require either 2.5V or 3.3V. 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.
Pentium II is a trademark of Intel Corporation.
©2016 Integrated Device Technology, Inc.
1
Revision 3, October 4, 2016
OBSOLETE
MPC942C Datasheet
.
LOGIC DIAGRAM
MPC942C Block Diagram
LVCMOS_CLK
Q0
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
V
CC
Q12
Q13
Q14
GND
Q15
Q16
Q17
13
12
11
10
9
1
2
3
4
5
6
7
8
V
CC
Q10
19
NC
Q11
18
V
CC
V
CC
21
NC
Q9
20
OE
Q6
Q7
23
Q8
22
LVCMOS_CLK
24
GND
Q5
Q4
Q3
V
CC
Q2
Q1
Q0
25
26
27
28
29
30
31
32
MPC942C
GND
Table 1. Absolute Maximum Ratings
Symbol
V
CC
V
I
I
IN
T
Stor
Supply Voltage
Input Voltage
Input Current
Storage Temperature Range
–40
Parameter
Min
–0.3
–0.3
Max
3.6
V
CC
+ 0.3
20
125
Unit
V
V
mA
C
©2016 Integrated Device Technology, Inc.
GND
2
Revision 3, October 4, 2016
OBSOLETE
MPC942C Datasheet
Table 2. DC Characteristics
(T
A
= 0 to 70C, V
CCI
= 2.5V ±5%, V
CCO
= 2.5V ±5%)
Symbol
V
IH
V
IL
V
OH
V
OL
I
IN
C
IN
C
PD
Z
OUT
I
CC
Input HIGH Voltage
Input LOW Voltage
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
2.0
0.5
200
Characteristic
Min
2.0
Typ
Max
V
CCI
0.8
Unit
V
V
V
V
A
pF
pF
mA
Per Output
I
OH
= –16 mA
I
OL
= 16 mA
Condition
Table 3. AC Characteristics
(T
A
= 0 to 70C, V
CCI
= 2.5V ±5%, V
CCO
= 2.5V ±5%)
Symbol
F
max
t
PLH
t
sk(o)
t
sk(pr)
t
sk(pr)
d
t
t
r
, t
f
Maximum Frequency
Propagation Delay
Output-to-Output Skew
Part-to-Part Skew
Part-to-Part Skew
Duty Cycle
Output Rise/Fall Time
45
0.2
1.5
Characteristic
Min
Typ
Max
200
2.8
200
1.3
600
55
1.0
Unit
MHz
ns
ps
ns
ps
%
ns
Notes 1, 2
Notes 1, 3
Condition
Table 4. DC Characteristics
(T
A
= 0 to 70C, V
CCI
= 3.3V ±5%, V
CCO
= 3.3V ±5%)
Symbol
V
IH
V
IL
V
OH
V
OL
I
IN
C
IN
C
PD
Z
OUT
I
CC
Input HIGH Voltage
Input LOW Voltage
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
2.4
0.5
200
Characteristic
Min
2.4
Typ
Max
V
CCI
0.8
Unit
V
V
V
V
A
pF
pF
mA
Per Output
I
OH
= –20 mA
I
OL
= 20 mA
Condition
Table 5. AC Characteristics
(T
A
= 0 to 70C, V
CCI
= 3.3V ±5%, V
CCO
= 3.3V ±5%)
Symbol
F
max
t
PLH
t
sk(o)
t
sk(pr)
t
sk(pr)
d
t
t
r
, t
f
Maximum Frequency
Propagation Delay
Output-to-Output Skew
Part-to-Part Skew
Part-to-Part Skew
Duty Cycle
Output Rise/Fall Time
45
0.2
1.3
Characteristic
Min
Typ
Max
250
2.3
200
1.0
500
55
1.0
Unit
MHz
ns
ps
ns
ps
%
ns
Notes 1, 2
Notes 1, 3
Note 1
Condition
1. Tested using standard input levels, production tested @ 133 MHz.
2. Across temperature and voltage ranges, includes output skew.
3. For a specific temperature and voltage, includes output skew.
©2016 Integrated Device Technology, Inc.
3
Revision 3, October 4, 2016
OBSOLETE
MPC942C Datasheet
PACKAGE DIMENSIONS
4X
6
D1
PIN 1 INDEX
0.20 H
A-B D
e/2
3
A, B, D
D1/2
32
25
1
E1/2 A
6 E1
DETAIL G
8
B
E
E/2
4
F
F
17
DETAIL G
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES PER
ASME Y14.5M, 1994.
3. DATUMS A, B, AND D TO BE DETERMINED AT
DATUM PLANE H.
4. DIMENSIONS D AND E TO BE DETERMINED AT
SEATING PLANE C.
5. DIMENSION b DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR PROTRUSION
SHALL NOT CAUSE THE LEAD WIDTH TO EXCEED
THE MAXIMUM b DIMENSION BY MORE THAN
0.08-mm. DAMBAR CANNOT BE LOCATED ON THE
LOWER RADIUS OR THE FOOT. MINIMUM SPACE
BETWEEN PROTRUSION AND ADJACENT LEAD OR
PROTRUSION: 0.07-mm.
6. DIMENSIONS D1 AND E1 DO NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE PROTRUSION IS
0.25-mm PER SIDE. D1 AND E1 ARE MAXIMUM
PLASTIC BODY SIZE DIMENSIONS INCLUDING
MOLD MISMATCH.
7. EXACT SHAPE OF EACH CORNER IS OPTIONAL.
8. THESE DIMENSIONS APPLY TO THE FLAT
SECTION OF THE LEAD BETWEEN 0.1-mm AND
0.25-mm FROM THE LEAD TIP.
7
9
D
D
4
D/2
4X
0.20 C
A-B D
H
28X
e
32X
0.1 C
SEATING
PLANE
C
DETAIL AD
PLATING
BASE
METAL
b1
c
c1
b
8X
5
8
(θ1˚)
R R2
R R1
0.20
M
C A-B D
SECTION F-F
A
A2
0.25
GAUGE PLANE
A1
(S)
(L1)
L
θ˚
DETAIL AD
DIM
A
A1
A2
b
b1
c
c1
D
D1
e
E
E1
L
L1
q
q1
R1
R2
S
MILLIMETERS
MIN
MAX
1.40
1.60
0.05
0.15
1.35
1.45
0.30
0.45
0.30
0.40
0.09
0.20
0.09
0.16
9.00 BSC
7.00 BSC
0.80 BSC
9.00 BSC
7.00 BSC
0.50
0.70
1.00 REF
0˚
7˚
12 REF
0.08
0.20
0.08
---
0.20 REF
CASE 873A-03
CASE 873A-03
ISSUE B
LQFP PLASTIC PACKAGE
©2016 Integrated Device Technology, Inc.
4
Revision 3, October 4, 2016
OBSOLETE
MPC942C Datasheet
Revision History Sheet
Rev
2
2
3
Table
Page
1
1
1
Description of Change
NRND – Not Recommend for New Designs
Product Discontinuation Notice - PDN CQ-15-02
Obsolete per Product Discontinuation Notice - PDN CQ-15-02.
Date
1/8/13
5/6/15
10/4/16
©2016 Integrated Device Technology, Inc.
5
Revision 3, October 4, 2016
OBSOLETE
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