DA9271.003
23 April 2003
1 (5)
This is preliminary information on a
new product under development.
Micro Analog Systems reserves the
right to make any changes without
notice.
MAS9271
IC FOR 10.00 40.00 MHz PXO
Low Power
Wide Supply Voltage Range
Square Wave Output
Very High Level of Integration
Electrically Trimmable
Very Low Phase Noise
Low Cost
DESCRIPTION
The MAS9271 is an integrated circuit well suited to
make initial offset trimming of the crystal in
oscillator. The trimming is done by a serial bus and
the calibration information is stored in an internal
PROM.
To build a Precision Crystal Oscillator (PXO) only
one additional component, a crystal is needed.
FEATURES
APPLICATIONS
Very small size
Minimum current draw
Wide operating temperature range
Phase noise <-130 dBc/Hz at 1 kHz offset
Square wave output
PXO for data terminals
PXO for telecommunication applications
PXO for computer application
BLOCK DIAGRAM
DA
CLK
PV
VSS
VDD
X2
OUT
X1
X'Tal
Digital
MAS9271
3
PD
5
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PIN DESCRIPTION
Pin Description
Symbol
x-coordinate
y-coordinate
Note
Power Supply Voltage
VDD
177
172
Serial Bus Data Input
DA
435
1015
Serial Bus Clock Input
CLK
201
1015
Programming Input
PV
1042
1015
Tri State
PD
1012
158
1)
Crystal Oscillator Output
X1
374
158
Power Supply Ground
VSS
830
1008
Crystal/Varactor Oscillator Input
X2
817
158
Buffer Output
OUT
665
1015
Note:
Because the substrate of the die is internally connected to VDD, the die has to be connected to VDD or
left floating. Please make sure that VDD is the first pad to be bonded. Pick-and-place and all component
assembly are recommended to be performed in ESD protected area.
Note:
Pad coordinates measured from the left bottom corner of the chip to the center of the pads. The
coordinates may vary depending on sawing width and location, however, distances between pads are accurate.
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Min
Max
Unit
Note
Supply Voltage
V
DD
- V
SS
-0.3
6.0
V
Input Voltage
V
IN
V
SS
-0.3
V
DD
+ 0.3
V
1)
Power Dissipation
P
MAX
100
mW
Storage Temperature
T
ST
-40
120
o
C
Note:
Not valid for programming pin PV
RECOMMENDED OPERATION CONDITIONS
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Supply Voltage
V
DD
2.5
2.8
5.5
V
Supply Current
I
CC
Vdd = 2.8 Volt
2.3
mA
Operable Temperature
T
C
-40
+85
o
C
Storage Temperature
T
S
Relative humidity =
15%...70%
-5
+40
o
C
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ELECTRICAL CHARACTERISTICS
(recommended operation conditions)
Parameter
Symbol
Min
Typ
Max
Unit
Note
Frequency Range
f
o
10.00
40.00
MHz
1)
Output Voltage (10 pF, Vdd 2.7V)
V
out
2.3
Vpp
Output Voltage (10 pF, Vdd 5.0V)
V
out
4.5
Vpp
Rise and Fall Time (10 - 50pF)
10
ns
Output Symmetry
40-60
%
Crystal Load
C
G
5.1
11.5
pF
2)
Startup Time
T
START
2
ms
Negative Resistance in Maximum
Load at 32 MHz
NegR
85
Negative Resistance in Maximum
Load at 40 MHz
NegR
40
Tri State Output Buffer
ON State
OFF State
PD
0
1.6
0.55
VDD
V
Note 1:
Rs < 10
crystal provides typically a maximum frequency of 40 MHz and Rs<30
=a maximum
frequency of 32 MHz. With Rs = 50
=crystal the maximum frequency is typically 26 MHz.
Note 2:
Crystal Load is at minimum when all CDAC bits are 0s, and at maximum when all CDAC bits are 1s.
IC OUTLINES
Note 1
: MAS9271 pads are round with 80 m diameter at opening.
Note 2:
Pins PV, CLK and DA must not be connected in PXO module end-user application.
1200 m
1
1
8
2
m
Die map reference
VDD
CLK
PV
OUT
X2
VSS
X1
PD
MAS9271
DA
DA9271.003
23 April 2003
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SAMPLES IN SB20 DIL PACKAGE
M
A
S
9
2
7
1
Y
Y
W
W
X
X
X
X
X
.
X
2
1
20
3
4
5
6
7
8
9
10
19
18
17
16
15
14
13
12
11
X1
GND
X2
OUT
DA
PV
Top marking:
YYWW = Year, Week
XXXXX.X = Lot number
VDD
CLK
PD
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ORDERING INFORMATION
Product Code
Product
Package
Comments
MAS9271ATB1
IC FOR PXO
Tested wafers 480 m
Die size 1200 x 1182 m
MAS9271ATG1
IC FOR PXO
Tested wafers 215 m
Die size 1200 x 1182 m
Please contact Micro Analog Systems Oy for other wafer thickness options.
LOCAL DISTRIBUTOR
MICRO ANALOG SYSTEMS OY CONTACTS
Micro Analog Systems Oy
Kamreerintie 2, P.O. Box 51
FIN-02771 Espoo, FINLAND
http://www.mas-oy.com
Tel. (09) 80 521
Tel. Int. +358 9 80 521
Telefax +358 9 805 3213
Email: info@mas-oy.com
NOTICE
Micro Analog Systems Oy reserves the right to make changes to the products contained in this data sheet in order to improve the design or
performance and to supply the best possible products. Micro Analog Systems Oy assumes no responsibility for the use of any circuits
shown in this data sheet, conveys no license under any patent or other rights unless otherwise specified in this data sheet, and makes no
claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and
Micro Analog Systems Oy makes no claim or warranty that such applications will be suitable for the use specified without further testing or
modification.
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