MAX7381AXR126+T [MAXIM]

TTL Output Clock Oscillator, 12MHz Nom;
MAX7381AXR126+T
型号: MAX7381AXR126+T
厂家: MAXIM INTEGRATED PRODUCTS    MAXIM INTEGRATED PRODUCTS
描述:

TTL Output Clock Oscillator, 12MHz Nom

振荡器 石英晶振 机械
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
= 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 1kload or a  
positive-supply-connected 500load 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.  

相关型号:

MAX7381AXR126-T

3-Pin Silicon Oscillator
MAXIM

MAX7381AXR136

Analog Circuit, 1 Func, BICMOS, PDSO3, EIAJ, SC-70, 3 PIN
MAXIM

MAX7381AXR136-T

Analog Circuit, 1 Func, BICMOS, PDSO3, EIAJ, SC-70, 3 PIN
MAXIM

MAX7381AXR146

TTL Output Clock Oscillator, 14MHz Nom
MAXIM

MAX7381AXR146-T

3-Pin Silicon Oscillator
MAXIM

MAX7381AXR166

TTL Output Clock Oscillator, 16MHz Nom
MAXIM

MAX7381AXR166+

TTL Output Clock Oscillator, 16MHz Nom
MAXIM

MAX7381AXR166+T

TTL Output Clock Oscillator, 16MHz Nom
MAXIM

MAX7381AXR166-T

3-Pin Silicon Oscillator
MAXIM

MAX7381AXR326

Analog Circuit, 1 Func, BICMOS, PDSO3, EIAJ, SC-70, 3 PIN
MAXIM

MAX7381AXR326-T

Analog Circuit, 1 Func, BICMOS, PDSO3, EIAJ, SC-70, 3 PIN
MAXIM

MAX7381AXR336-T

Analog Circuit, 1 Func, BICMOS, PDSO3, EIAJ, SC-70, 3 PIN
MAXIM