MAX7381AXR146-T [MAXIM]
3-Pin Silicon Oscillator; 3引脚硅振荡器型号: | MAX7381AXR146-T |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | 3-Pin Silicon Oscillator |
文件: | 总6页 (文件大小:544K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
19-3697; Rev 0; 4/05
3-Pin Silicon Oscillator
General Description
Features
♦ 2.7V to 5.5V Operation
The MAX7381 is a silicon oscillator intended as a low-cost
improvement to ceramic resonators, crystals, and crystal
oscillator modules as the clock source for microcon-
trollers and UARTs in 3V, 3.3V, and 5V applications.
♦ Factory-Trimmed Oscillator (10MHz to 16MHz)
♦ No External Components Required
The MAX7381 is an integrated oscillator, supplied at spe-
cific frequencies, just like crystals and resonators, and
with a rail-to-rail, 50%, duty-cycle square-wave output.
The oscillator frequency is generated directly without the
use of a phase-locked loop (PLL). No additional compo-
nents are required for setting or adjusting the frequency.
♦
10mꢀ Output-ꢁriꢂe Current
♦ 2% Initial ꢀccuracy
100ppmꢃ/C Temperature ꢁriꢄt
♦
♦ Fast Startup Time: 5µs
Unlike typical crystal and ceramic resonator oscillator cir-
cuits, the MAX7381 is resistant to vibration and EMI. The
high output-drive current and absence of high-imped-
ance nodes make the oscillator invulnerable to dirty or
humid operating conditions. With a wide operating tem-
perature range as standard, the oscillator is a good
choice for demanding appliance and automotive environ-
ments. The MAX7381 is available with frequencies in the
10MHz to 16MHz range.
♦ 40% to 60% Maximum ꢁuty Cycle
♦ 5ns Output RiseꢃFall Time
♦ Very-Low-EMI Susceptibility (No High-Impedance
Nodes)
♦ No PLL
♦ Low Jitter: 180ps
at 16MHz
P-P
♦ -40/C to +125/C Temperature Range
The MAX7381 is offered in a space-saving 3-pin SC70
package. All ICs are guaranteed to operate over the
-55°C to +135°C temperature range and specified from
the -40°C to +125°C temperature range.
Ordering Information
Applications
White Goods
PꢀRT
TEMP RꢀNGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PꢀCKꢀGE
3 SC70-3
MAX7381AXR106-T
MAX7381AXR126-T
MAX7381AXR146-T
MAX7381AXR166-T
Automotive
3 SC70-3
Appliances and Controls
Handheld Products
3 SC70-3
3 SC70-3
Portable Equipment
The MAX7381 is available in factory-set frequencies from
10MHz to 16MHz. There are four standard versions 10MHz,
12MHz, 14MHz, and 16MHz, shown in the Selector Guide) with
a required order increment of 2.5K. Nonstandard frequencies
are also available with a required order increment of 10K. For
nonstandard versions, contact factory for availability and
ordering information. All versions are available in tape and reel
only.
Microcontroller Systems
Typical Operating Circuit
2.7V TO 5.5V
Refer to the MAX7375 data sheet for output frequencies below
10MHz.
V+
OSC1
CLOCK
MAX7381
µC
GND
OSC2
Selector Guide appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
3-Pin Silicon Oscillator
ꢀBSOLUTE MꢀXIMUM RꢀTINGS
V+ to GND.............................................................-0.3V to +6.0V
CLK to GND..................................................-0.3V to (V+ + 0.3V)
CLK Current ..................................................................... 50mA
Functional Temperature Range.........................-55°C to +135°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Continuous Power Dissipation (T = + 70°C)
A
3-Pin SC70 (derate 2.9mW/°C over +70°C)..............235.3mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICꢀL CHꢀRꢀCTERISTICS
(V+ = 2.7V to 5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at V+ = 5V, T = +25°C, unless otherwise
A
A
noted.) (Note 1)
PꢀRꢀMETER
SYMBOL
CONꢁITIONS
MIN
TYP
MꢀX
5.5
UNITS
Operating Supply Voltage
V+
2.7
V
MAX7381AXR126
MAX7381AXR166
3.7
4.8
4.75
6.50
Operating Supply Current
Output High Voltage
I+
mA
V
V+ -
0.4
V+ ≥ 2.7V, I
V+ ≥ 4.5V, I
= 2.5mA
= 9mA
SOURCE
SOURCE
V
OH
V+ -
0.4
V+ ≥ 2.7V, I
V+ ≥ 4.5V, I
= 10mA
0.4
0.4
SINK
SINK
Output Low Voltage
On-Resistance
V
V
OL
= 20mA
V
V
= 3V (typ value at T = +25°C)
0.11
0.17
0.15
IN
IN
A
Ω
= 5V (typ value at T = +25°C)
0.095
A
V+ = 5.0V,
= +25°C
MAX7381AXR_ _ _
MAX7381AXR_ _ _
-2%
-5%
+2%
+3%
T
A
Initial CLOCK Frequency
(Note 2)
f
MHz
CLOCK
V+ = 2.7V to 5.5V,
= +25°C
T
A
CLOCK Frequency Temperature
Sensitivity
T = -40°C to +125°C, (Note 3)
A
-350
40
100
50
+300
60
ppm/°C
%
Duty Cycle
(Note 3)
Observation for 20s using a 12GHz
oscilloscope (MAX7381AXR166)
Output Jitter
180
ps -
P P
Output Rise Time
Output Fall Time
Startup Time
t
5
5
5
ns
ns
µs
R
t
F
Note 1: All parameters tested at T = +25°C. Specifications over temperature are guaranteed by design and characterization.
A
Note 2: Typical frequencies are nominal values.
Note 3: Guaranteed by design and characterization. Not production tested.
2
_______________________________________________________________________________________
3-Pin Silicon Oscillator
Typical Operating Characteristics
(V+ = 5V, C = 10pF, 16MHz output, T = +25°C, unless otherwise noted.)
L
A
DUTY CYCLE vs. TEMPERATURE
DUTY CYCLE vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
55
54
53
52
51
50
49
48
47
46
45
55
53
51
49
47
45
6
5
4
3
2
1
0
V+ = 5V
V+ = 3.3V
V+ = 2.7V
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40 -25 -10
5
20 35 50 65 80 95 110 125
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
FREQUENCY vs. SUPPLY VOLTAGE
FREQUENCY vs. TEMPERATURE
6
5
4
3
2
1
0
1.010
1.005
1.000
0.995
0.990
0.985
0.980
1.035
1.025
1.015
1.005
0.995
0.985
0.975
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40 -25 -10
5
20 35 50 65 80 95 110 125
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
CLOCK OUTPUT WAVEFORM
SUPPLY CURRENT vs. FREQUENCY
SETTLING TIME FROM START
WITH C = 10pF
L
MAX7381 toc09
MAX7381 toc08
6
5
4
3
2
1
0
CLOCK
1V/div
CLOCK
2V/div
V+
2V/div
V+ = 3.3V
V+ = 3.3V
V+ = 5V
10
11
12
13
14
15
16
20ns/div
100ns/div
FREQUENCY (MHz)
_______________________________________________________________________________________
3
3-Pin Silicon Oscillator
Typical Operating Characteristics (continued)
(V+ = 5V, C = 10pF, 16MHz output, T = +25°C, unless otherwise noted.)
L
A
CLOCK OUTPUT WAVEFORM
CLOCK OUTPUT WAVEFORM
WITH C = 50pF
WITH C = 100pF
L
L
MAX7381 toc10
MAX7381 toc11
CLOCK
1V/div
CLOCK
1V/div
V+ = 3.3V
V+ = 3.3V
20ns/div
20ns/div
Detailed Description
Pin Description
The MAX7381 is a replacement for ceramic resonators,
crystals, and crystal-oscillator modules as the clock
source for microcontrollers and UARTs in 3V, 3.3V, and
5V applications. The MAX7381 is an integrated oscilla-
tor, supplied at specific frequencies just like crystals
and resonators. A variety of popular standard frequen-
cies are available. No external components are
required for setting or adjusting the frequency.
PIN
NꢀME
FUNCTION
Positive Supply Voltage. Bypass V+
to GND with a 0.1µF surface-mount
ceramic capacitor.
1
V+
Clock Output. CLOCK is a push-
pull output.
2
3
CLOCK
GND
Ground
Supply Voltages
The MAX7381 has been designed for use in systems
with nominal supply voltages of 3V, 3.3V, or 5V and is
specified for operation with supply voltages in the 2.7V
to 5.5V range. Operation outside this range is not guar-
anteed. See the Absolute Maximum Ratings for limit
values of power-supply and pin voltages.
are approximately proportional to the period of the out-
put frequency of the device.
The jitter performance of all clock sources degrades in
the presence of mechanical and electrical interference.
The MAX7381 is relatively immune to vibration, shock,
and EMI influences, and thus provides a considerably
more robust clock source than crystal- or ceramic-
resonator-based oscillator circuits.
Oscillator
The clock output is a push-pull configuration and is
capable of driving a ground-connected 1kΩ load or a
positive-supply-connected 500Ω load to within 400mV
of either supply rail. The clock output remains stable
over the full operating voltage range. A typical startup
characteristic is shown in the Typical Operating
Characteristics section.
Applications Information
Interfacing to a Microcontroller
Clock Input
The MAX7381 clock output is a push-pull, CMOS, logic
output, which directly drives any microprocessor (µP)
or microcontroller (µC) clock input. There are no imped-
ance-matching issues when using the MAX7381.
Operate the MAX7381 and microcontroller (or other
clock-input device) from the same supply voltage.
Refer to the microcontroller data sheet for clock-input
compatibility with external clock signals.
Output Jitter
The MAX7381’s jitter performance is given in the
Electrical Characteristics table as a peak-to-peak value
obtained by observing the output of the MAX7381 for
20s with a 500MHz oscilloscope. Jitter measurements
4
_______________________________________________________________________________________
3-Pin Silicon Oscillator
The MAX7381 requires no biasing components or load
capacitance. When using the MAX7381 to retrofit a
crystal oscillator, remove all biasing components from
the oscillator input.
Chip Information
PROCESS: BiCMOS
Startup Performance
The MAX7381 oscillator output stabilizes within a few
cycles of operation after V+ rises to a sufficient voltage
to start the oscillator, typically 1.65V at +25°C. Use a
reset or similar voltage-detection circuit to disable
devices connected to the MAX7381 until 20µs after the
voltage on V+ has risen above 2.7V.
Selector Guide
PꢀRT
FREQUENCY (MHz)
TOP MꢀRK
APE
MAX7381AXR106
MAX7381AXR126
MAX7381AXR146
MAX7381AXR166
10
12
14
16
APG
ARC
Power-Supply Considerations
The MAX7381 operates with power-supply voltages in
the 2.7V to 5.5V range. Power-supply decoupling is
needed to maintain the power-supply rejection perfor-
mance of the MAX7381. Use a 0.1µF surface-mount
ceramic capacitor connected between V+ and GND
and mounted as close to the device as possible. If pos-
sible, mount the MAX7381 close to the microcontroller’s
decoupling capacitor so that additional decoupling is
not required.
APH
Pin Configuration
TOP VIEW
V+
1
2
GND
3
MAX7381
A larger value bypass capacitor is recommended if the
MAX7381 is driving a large capacitive load. Use a
bypass capacitor value of at least 1000 times the out-
put-load capacitance.
CLOCK
SC70
_______________________________________________________________________________________
5
3-Pin Silicon Oscillator
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.comꢃpackages.)
PACKAGE OUTLINE, 3L SC70
1
21-0075
C
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 6
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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