MAXIM MAX7381 User Manual
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General Description
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 microcontrollers and UARTs in 3V, 3.3V, and 5V applications.
The MAX7381 is an integrated oscillator, supplied at specific 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 components are required for setting or adjusting the frequency.
Unlike typical crystal and ceramic resonator oscillator circuits, the MAX7381 is resistant to vibration and EMI. The
high output-drive current and absence of high-impedance nodes make the oscillator invulnerable to dirty or
humid operating conditions. With a wide operating temperature range as standard, the oscillator is a good
choice for demanding appliance and automotive environments. The MAX7381 is available with frequencies in the
10MHz to 16MHz 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.
Applications
White Goods
Automotive
Appliances and Controls
Handheld Products
Portable Equipment
Microcontroller Systems
Features
♦ 2.7V to 5.5V Operation
♦ Factory-Trimmed Oscillator (10MHz to 16MHz)
♦ No External Components Required
♦ ±10mA Output-Drive Current
♦ 2% Initial Accuracy
♦ ±100ppm/°C Temperature Drift
♦ Fast Startup Time: 5µs
♦ 40% to 60% Maximum Duty Cycle
♦ 5ns Output Rise/Fall Time
♦ Very-Low-EMI Susceptibility (No High-Impedance
Nodes)
♦ No PLL
♦ Low Jitter: 180ps
P-P
at 16MHz
♦ -40°C to +125°C Temperature Range
MAX7381
3-Pin Silicon Oscillator
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3697; Rev 0; 4/05
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.
PART TEMP RANGE
PIN-PACKAGE
MAX7381AXR106-T -40°C to +125°C 3 SC70-3
MAX7381AXR126-T -40°C to +125°C 3 SC70-3
MAX7381AXR146-T -40°C to +125°C 3 SC70-3
MAX7381AXR166-T -40°C to +125°C 3 SC70-3
Typical Operating Circuit
Selector Guide appears at end of data sheet.
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.
Refer to the MAX7375 data sheet for output frequencies below
10MHz.
2.7V TO 5.5V
V+
CLOCK
OSC1
MAX7381
GND
µC
OSC2
MAX7381
3-Pin Silicon Oscillator
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
V+ to GND .............................................................-0.3V to +6.0V
CLK to GND..................................................-0.3V to (V+ + 0.3V)
CLK Current .....................................................................±50mA
Continuous Power Dissipation (T
A
= + 70°C)
3-Pin SC70 (derate 2.9mW/°C over +70°C)..............235.3mW
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
ELECTRICAL CHARACTERISTICS
(V+ = 2.7V to 5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = 5V, TA= +25°C, unless otherwise
noted.) (Note 1)
PARAMETER
CONDITIONS
UNITS
Operating Supply Voltage V+ 2.7 5.5 V
MAX7381AXR126 3.7
Operating Supply Current I+
MAX7381AXR166 4.8
mA
V+ ≥ 2.7V, I
SOURCE
= 2.5mA
V+ -
0.4
Output High Voltage V
OH
V+ ≥ 4.5V, I
SOURCE
= 9mA
V+ -
0.4
V
V+ ≥ 2.7V, I
SINK
= 10mA 0.4
Output Low Voltage V
OL
V+ ≥ 4.5V, I
SINK
= 20mA 0.4
V
VIN = 3V (typ value at TA = +25°C)
On-Resistance
V
IN
= 5V (typ value at TA = +25°C)
Ω
V+ = 5.0V,
T
A
= +25°C
Initial CLOCK Frequency
(Note 2)
f
CLOCK
V+ = 2.7V to 5.5V,
T
A
= +25°C
MHz
CLOCK Frequency Temperature
Sensitivity
T
A
= - 40°C to + 125°C , (Note 3)
ppm/°C
Duty Cycle (Note 3) 40 50 60 %
Output Jitter
Observation for 20s using a 12GHz
oscilloscope (MAX7381AXR166)
psP-
P
Output Rise Time t
R
5ns
Output Fall Time t
F
5ns
Startup Time 5µs
Note 1: All parameters tested at TA= +25°C. Specifications over temperature are guaranteed by design and characterization.
Note 2: Typical frequencies are nominal values.
Note 3: Guaranteed by design and characterization. Not production tested.
SYMBOL
MIN TYP MAX
4.75
6.50
0.11 0.17
0.095 0.15
MAX7381AXR_ _ _ -2% +2%
MAX7381AXR_ _ _ -5% +3%
-350 100 +300
180
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