MAX7382_V01 [MAXIM]
Silicon Oscillator with Reset Output and Enable;
| 型号： | MAX7382_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Silicon Oscillator with Reset Output and Enable |
| 文件： | 总8页 (文件大小：238K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-3491; Rev 1; 3/07
Silicon Oscillator with Reset Output
and Enable
General Description
Features
The MAX7382 silicon oscillator replaces ceramic res-
onators, crystals, and crystal-oscillator modules as the
clock source for microcontrollers in 3V, 3.3V, and 5V
applications. The MAX7382 features a factory-pro-
grammed oscillator, a microprocessor (µP) power-on-
reset (POR) supervisor, and a clock enable input.
♦ 2.7V to 5.5V Operation
♦ 10MHz to 16MHz Oscillator
♦ Integrated POR (Factory Programmable)
10mꢀ ꢁlocꢂ Oꢃtpꢃt ꢄriꢅe ꢁapability
♦
♦ ꢁlocꢂ Enable Inpꢃt
♦ 2.5% Initial ꢀccꢃracy
Unlike typical crystal and ceramic-resonator oscillator
circuits, the MAX7382 is resistant to vibration and EMI.
The high-output-drive current and absence of high-
impedance nodes makes the oscillator less susceptible
to dirty or humid operating conditions. With a wide
operating temperature range, the MAX7382 is a good
choice for demanding home appliance and automotive
environments.
♦
100ppmꢆ/ꢁ Freꢇꢃency ꢄriꢈt
♦ 50% ꢄꢃty ꢁycle
♦ 5ns Oꢃtpꢃt Rise and Fall Time
♦ Typical 4.5mꢀ Operating ꢁꢃrrent at 16MHz
♦ Typical 0.5µꢀ Shꢃtdown Sꢃpply ꢁꢃrrent
♦ -40/ꢁ to +125/ꢁ Temperatꢃre Range
♦ Small 5-Pin SOT23 Pacꢂage
The MAX7382 is available with factory-programmed fre-
quencies ranging from 10MHz to 16MHz. See Table 2
for standard frequencies and contact the factory for
custom frequencies and POR thresholds.
The MAX7382 is available in a 5-pin SOT23 package.
The MAX7382 operating temperature range is -40°C to
+125°C.
Ordering Information
PIN-
PꢀꢁKꢀGE
RESET
OUTPUT
Applications
PꢀRT*
TEMP RꢀNGE
White Goods
Active-low
push-pull
MAX7382B_ _ _-T -40 C to +125 C 5 SOT23-5
Automotive
Consumer Products
Appliances and Controls
Handheld Products
Portable Equipment
Microcontroller Systems
5 SOT23-5 Open drain
MꢀX7382ꢁ_ _ _-T -40 ꢁ to +125 ꢁ
*Standard version is shown in bold. The first letter after the part
number designates the reset output option. Insert the letter
corresponding to the desired reset threshold level from Table 1
in the next position. Insert the two-letter code from Table 2 in
the remaining two positions for the desired frequency range.
Table 1 and Table 2 are located at the end of the data sheet.
Typical Operating Circuit
V
CC
2.7V TO 5.5V
0.1
F
V
CC
OSC1
CLOCK
OSC2
RST
MAX7382
ENABLE
RST
C
GND
Pin Configuration 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.
Silicon Oscillator with Reset Output
and Enable
ꢀBSOLUTE MꢀXIMUM RꢀTINGS
CC
All Other Pins to GND.................................-0.3V to (V
CLOCK, RST Current ....................................................... 50mA
V
to GND...........................................................-0.3V to +6.0V
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
+ 0.3V)
CC
Input Current (ENABLE) ................................................... 50mA
Continuous Power Dissipation (T = +70°C)
A
5-Pin SOT23 (derate 7.1mW/°C above +70°C)....571mW (U5-2)
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.
ELEꢁTRIꢁꢀL ꢁHꢀRꢀꢁTERISTIꢁS
(Typical Operating Circuit, V
= 3.0V to 5.5V, T = -40°C to +125°C. Typical values are at V
= 5.0V, T = +25°C, unless other-
CC A
CC
A
wise noted.) (Notes 1 and 2)
PꢀRꢀMETER
SYMBOL
ꢁONꢄITIONS
MIN
TYP
MꢀX
5.5
8.7
8.0
6.5
6.0
5.4
1
UNITS
Operating Supply Voltage
V
2.7
V
CC
CC
f
f
f
f
f
= 16MHz, V
= 5.5V, no load
CLOCK
CLOCK
CLOCK
CLOCK
CLOCK
CC
CC
CC
CC
CC
= 14MHz, V
= 12MHz, V
= 11MHz, V
= 10MHz, V
= 5.5V, no load
= 5.5V, no load
= 5.5V, no load
= 5.5V, no load
Operating Supply Current
I
mA
Shutdown Supply Current
I
ENABLE = 0V
0.5
µA
V
SHDN
LOGIꢁ INPUTS (ENꢀBLE)
0.7 x
Input High Voltage
Input Low Voltage
V
IH
V
CC
0.3 x
V
V
IL
V
CC
Input Current
I
V
= V = 5.5V
ENABLE
2
µA
IN
CC
ꢁLOꢁK OUTPUT
V
V
= 4.5V, I
= 3.0V, I
= 7.0mA
CC
CC
SOURCE
V
0.4
-
CC
Output High Voltage
Output Low Voltage
V
V
V
OH
= 2.0mA for
SOURCE
MAX7382xSxx
V
V
= 4.5V, I
= 3.0V, I
= 20mA
CC
CC
SINK
V
0.4
OL
= 10mA
SINK
V
= 5V (for MAX7382xMxx) or V
= 3.3V
CC
CC
(for MAX7382xSxx), T = +25°C, deviation
A
from nominal frequency
-2.5
-5.0
+2.5
+3.5
Clock Frequency Accuracy
f
%
CLOCK
V
= 3.0V to 5.5V, T = +25°C, deviation
A
CC
from nominal frequency
Clock Temperature Coefficient
(Note 3)
100
550 ppm/°C
2
_______________________________________________________________________________________
Silicon Oscillator with Reset Output
and Enable
ELEꢁTRIꢁꢀL ꢁHꢀRꢀꢁTERISTIꢁS (continꢃed)
(Typical Operating Circuit, V
= 3.0V to 5.5V, T = -40°C to +125°C. Typical values are at V
= 5.0V, T = +25°C, unless other-
CC A
CC
A
wise noted.) (Notes 1 and 2)
PꢀRꢀMETER
Duty Cycle
SYMBOL
ꢁONꢄITIONS
MIN
TYP
50
240
5
MꢀX
UNITS
%
(Note 3)
= 16MHz;
40
60
Output Period Jitter
Output Rise Time
Output Fall Time
J
f
6
period jitter
ps
P
OUT
t
10% to 90%, C = 10pF
ns
R
L
t
90% to 10%, C = 10pF
5
ns
F
L
V
rising, deviation
CC
T
A
= +25°C
-2
-5
+2
+5
Power-On-Reset Threshold
Accuracy
from nominal
threshold (V
(Table 1)
%
)
TH
Difference between rising and falling
thresholds
Power-On-Reset Hysteresis
1
%
Power-On-Reset Delay
PORdly
V
rising from 0 to 5V in 1µs at +25°C
122
µs
CC
RESET OUTPUT (RST)
V
= 4.5V, I
= 7.0mA
= 2.0mA
CC
SOURCE
(MAX7382xMxx)
V
0.4
-
CC
Output High Voltage (Note 4)
Output Low Voltage
V
V
V
OH
V
= 3.0V, I
CC
SOURCE
(MAX7382xSxx)
V
V
= 4.5V, I
= 3.0V, I
= 20mA (MAX7382xMxx)
= 10mA (MAX7382xSxx)
CC
CC
SINK
V
0.4
OL
SINK
Note 1: All parameters tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
Note 2: Oscillator is enabled when V
> V
.
TH
CC
Note 3: Guaranteed by design. Not production tested.
Note 4: For push-pull output only.
_______________________________________________________________________________________
3
Silicon Oscillator with Reset Output
and Enable
Typical Operating Characteristics
(V
= V
= 5V, T = +25°C, frequency = 10MHz, unless otherwise noted.)
ENABLE A
CC
DUTY CYCLE
vs. SUPPLY VOLTAGE
DUTY CYCLE vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
51
50
49
48
47
46
45
3.25
3.20
3.15
3.10
3.05
3.00
2.95
2.90
50.5
50.0
49.5
49.0
48.5
48.0
FREQUENCY = 11MHz
FREQUENCY = 10MHz
FREQUENCY = 10MHz
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
-55
-17
21
59
97
135
-55
-17
21
59
97
135
TEMPERATURE ( C)
TEMPERATURE ( C)
FREQUENCY DEVIATION
vs. SUPPLY VOLTAGE
FREQUENCY DEVIATION
vs. TEMPERATURE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
2.0
1.5
1.0
0.5
0
4
3
4.0
3.5
3.0
2.5
2.0
1.5
FREQUENCY = 11MHz
FREQUENCY = 10MHz
FREQUENCY = 11MHz
2
1
0
-0.5
-1.0
-1.5
-2.0
-1
-2
-3
-4
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
-55
-17
21
59
97
135
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
SUPPLY VOLTAGE (V)
TEMPERATURE ( C)
CLOCK OUTPUT WAVEFORM
CLOCK OUTPUT WAVEFORM
(C = 10pF)
(C = 10pF)
L
SETTLING TIME FROM START
L
MAX7382 toc09
MAX7382 toc08
MAX7382 toc07
CH1 FREQ
9.992MHz
LOW RESOLUTION
CH2
2V/div
2V/div
2V/div
CH1
2V/div
20ns/div
20ns/div
10 s/div
CHANNEL 1 = CLOCK, CHANNEL 2 = V
CC
4
_______________________________________________________________________________________
Silicon Oscillator with Reset Output
and Enable
Typical Operating Characteristics (continued)
(V
= V
= 5V, T = +25°C, frequency = 10MHz, unless otherwise noted.)
ENABLE A
CC
CLOCK OUTPUT WAVEFORM
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
SUPPLY CURRENT
vs. FREQUENCY
(C = 100pF)
L
MAX7382 toc10
1
0.1
5
4
3
2
1
10m
1m
2V/div
100
V
= 4.32V
RESET
0.14
10
1
20ns/div
0.04
0.09
0.19
0.24
10
11
12
13
14
15
16
RESET THRESHOLD OVERDRIVE (V)
FREQUENCY (MHz)
Pin Description
PIN
1
NꢀME
FUNꢁTION
CLOCK
GND
Push-Pull Clock Output
Ground
2
3
RST
Reset Output. Open-drain or push-pull output. See the Ordering Information.
Positive Supply Voltage. Bypass V to GND with a 0.1µF capacitor.
4
V
CC
CC
5
ENABLE
Active High Clock Enable Input. See the ENABLE Input section for more details.
operating voltage range and does not generate short
Detailed Description
output cycles during either power-on or changing of the
frequency. A typical oscillating startup is shown in the
Typical Operating Characteristics.
The MAX7382 is a clock generator with integrated reset
for microcontrollers (µCs) and UARTs in 3V, 3.3V, and
5V applications. The MAX7382 is a replacement for
crystal-oscillator modules, crystals, or ceramic res-
onators, and a system reset IC. The clock frequency
and reset threshold voltage are factory trimmed to spe-
cific values (see Tables 1 and 2). A variety of popular
standard frequencies are available. No external compo-
nents are required for setting or adjusting the frequency.
ENABLE Input
The MAX7382 has an active-high enable input that con-
trols the clock and reset outputs. The clock output is
driven low and RST asserts when the device is dis-
abled. Drive ENABLE low to disable the clock output on
next rising edge. Drive ENABLE high to activate the
clock output.
Oscillator
The push-pull clock output is enabled when V
> V
TH
CC
(Table 1) and drives a load to within 400mV of either
supply rail. The clock output remains stable over the full
_______________________________________________________________________________________
5
Silicon Oscillator with Reset Output
and Enable
Applications Information
Interfacing to a Microcontroller
Clock Input
Table 1. Standard Reset Threshold
Leꢅels
SUFFIX
RESET THRESHOLꢄ (V)
2.89 standard value
4.38 standard value
The MAX7382 clock output is a push-pull, CMOS, logic
output that directly drives a µP or µC clock input. There
are no impedance-matching issues when using the
MAX7382. Refer to the microcontroller data sheet for
clock input compatibility with external clock signals.
The MAX7382 requires no biasing components or load
capacitance. When using the MAX7382 to retrofit a
crystal oscillator, remove all biasing components from
the oscillator input.
S
M
Contact factory for nonstandard reset threshold options from
2.5V < V < 4.38V.
TH
Table 2. Standard Freꢇꢃencies
SUFFIX
UK
STꢀNꢄꢀRꢄ FREQUENꢁY (MHz)
10
11
12
14
16
Reset Output
The MAX7382 is available with two reset output stage
options: push-pull active-low and open-drain active-low.
UT
VB
RST is asserted when the monitored input (V ) drops
CC
VT
below the internal V threshold and remains asserted
TH
WB
for 120µs after the monitored input exceeds the internal
V
TH
threshold. The open-drain RST output requires an
For all other frequency options, contact factory.
external pullup resistor.
Output Jitter
The MAX7382’s jitter performance is given in the
Electrical Characteristics table as a period jitter
Table 3. Standard Part Nꢃmbers
6
RESET
THRESHOLꢄ
(V)
value. Jitter measurements are approximately propor-
tional to the period of the output of the device. The jitter
performance of all clock sources degrades in the pres-
ence of mechanical and electrical interference. The
MAX7382 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.
FREQUENꢁY
(MHz)
TOP
MꢀRK
PꢀRT
MAX7382CSUK
MAX7382CSUT
MAX7382CSVB
MAX7382CSVT
MAX7382CSWB
MAX7382CMUK
MAX7382CMUT
MAX7382CMVB
MAX7382CMVT
MAX7382CMWB
2.89
2.89
2.89
2.89
2.89
4.38
4.38
4.38
4.38
4.38
10
11
12
14
16
10
11
12
14
16
AEVU
AEYG
AEVM
AEYI
AEVK
AEXV
AEXW
AEVJ
AEXX
AEVH
V
2.7V TO 5.5V
CC
Initial Power-Up and Operation
MAX7382
LOGIC
RST
An internal power-up reset holds the clock output low
POR
and asserts RST until the supply voltage has risen
above the power-on- reset threshold (V ).
TH
RST holds the microcontroller in a reset condition until
120µs after the clock has started up. This reset delay
ensures that the clock output and the microcontroller’s
internal clock circuits have stabilized before the system
is allowed to start. Typical microcontroller reset delay
ranges from 1ms to 250ms to allow a slow crystal oscil-
lator circuit to start up. The MAX7382 has a fast startup,
eliminating the need for such a long reset delay.
ENABLE
CLOCK
OSCILLATOR
GND
Figure 1. Functional Diagram
6
_______________________________________________________________________________________
Silicon Oscillator with Reset Output
and Enable
Power-Supply Considerations
Pin Configuration
The MAX7382 operates with a 2.7V and 5.5V power-
supply voltage. Good power-supply decoupling is
needed to maintain the power-supply rejection perfor-
TOP VIEW
mance of the MAX7382. Bypass V
to GND with a
CC
0.1µF surface-mount ceramic capacitor. Mount the
bypassing capacitor as close to the device as possible.
If possible, mount the MAX7382 close to the microcon-
troller’s decoupling capacitor so that additional decou-
pling is not required. Use a larger value of bypass
capacitor recommended if the MAX7382 is to operate
with a large capacitive load. Use a bypass capacitor
value of at least 1000 times that of the output load
capacitance.
CLOCK
GND
1
2
3
5
4
ENABLE
MAX7382
RST
V
CC
SOT23
Chip Information
PROCESS: BiCMOS
_______________________________________________________________________________________
7
Silicon Oscillator with Reset Output
and Enable
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.comꢆpacꢂages.)
Revision History
Pages changed at Rev 1: 1–8
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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