19-3491; Rev 1; 3/07
Silicon Oscillator with Reset Output
and Enable
General Description
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.
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.
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.
♦
2.7V to 5.5V Operation
♦
10MHz to 16MHz Oscillator
♦
Integrated POR (Factory Programmable)
♦
±10mA Clock Output Drive Capability
♦
Clock Enable Input
♦
2.5% Initial Accuracy
♦
±100ppm/°C Frequency Drift
♦
50% Duty Cycle
♦
5ns Output Rise and Fall Time
♦
Typical 4.5mA Operating Current at 16MHz
♦
Typical 0.5µA Shutdown Supply Current
♦
-40°C to +125°C Temperature Range
♦
Small 5-Pin SOT23 Package
Features
MAX7382
Ordering Information
PART*
TEMP RANGE
PIN-
PACKAGE
RESET
OUTPUT
Applications
White Goods
Automotive
Consumer Products
Appliances and Controls
Handheld Products
Portable Equipment
Microcontroller Systems
Active-low
MAX7382B_ _ _-T -40°C to +125°C 5 SOT23-5 push-pull
MAX7382C_ _ _-T -40°C to +125°C 5 SOT23-5 Open drain
*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
0.1µF
V
CC
CLOCK
OSC1
OSC2
MAX7382
ENABLE
RST
RST
µC
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
MAX7382
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +6.0V
All Other Pins to GND.................................-0.3V to (V
CC
+ 0.3V)
CLOCK, RST Current .......................................................±50mA
Input Current (ENABLE) ...................................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C) ....571mW (U5-2)
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
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.
ELECTRICAL CHARACTERISTICS
(Typical
Operating Circuit,
V
CC
= 3.0V to 5.5V, T
A
= -40°C to +125°C. Typical values are at V
CC
= 5.0V, T
A
= +25°C, unless other-
wise noted.) (Notes 1 and 2)
PARAMETER
Operating Supply Voltage
SYMBOL
V
CC
f
CLOCK
= 16MHz, V
CC
= 5.5V, no load
f
CLOCK
= 14MHz, V
CC
= 5.5V, no load
Operating Supply Current
I
CC
f
CLOCK
= 12MHz, V
CC
= 5.5V, no load
f
CLOCK
= 11MHz, V
CC
= 5.5V, no load
f
CLOCK
= 10MHz, V
CC
= 5.5V, no load
Shutdown Supply Current
LOGIC INPUTS (ENABLE)
Input High Voltage
Input Low Voltage
Input Current
CLOCK OUTPUT
V
CC
= 4.5V, I
SOURCE
= 7.0mA
Output High Voltage
V
OH
V
CC
= 3.0V, I
SOURCE
= 2.0mA for
MAX7382xSxx
V
CC
= 4.5V, I
SINK
= 20mA
V
CC
= 3.0V, I
SINK
= 10mA
V
CC
= 5V (for MAX7382xMxx) or V
CC
= 3.3V
(for MAX7382xSxx), T
A
= +25°C, deviation
from nominal frequency
V
CC
= 3.0V to 5.5V, T
A
= +25°C, deviation
from nominal frequency
Clock Temperature Coefficient
(Note 3)
-2.5
V
CC
-
0.4
0.4
V
V
IH
V
IL
I
IN
V
CC
= V
ENABLE
= 5.5V
0.7 x
V
CC
0.3 x
V
CC
2
V
V
µA
I
SHDN
ENABLE = 0V
0.5
CONDITIONS
MIN
2.7
TYP
MAX
5.5
8.7
8.0
6.5
6.0
5.4
1
µA
mA
UNITS
V
Output Low Voltage
V
OL
V
+2.5
%
Clock Frequency Accuracy
f
CLOCK
-5.0
±100
+3.5
±550
ppm/°C
2
_______________________________________________________________________________________
Silicon Oscillator with Reset Output
and Enable
ELECTRICAL CHARACTERISTICS (continued)
(Typical
Operating Circuit,
V
CC
= 3.0V to 5.5V, T
A
= -40°C to +125°C. Typical values are at V
CC
= 5.0V, T
A
= +25°C, unless other-
wise noted.) (Notes 1 and 2)
PARAMETER
Duty Cycle
Output Period Jitter
Output Rise Time
Output Fall Time
Power-On-Reset Threshold
Accuracy
J
P
t
R
t
F
SYMBOL
(Note 3)
f
OUT
= 16MHz; ±6σ period jitter
10% to 90%, C
L
= 10pF
90% to 10%, C
L
= 10pF
V
CC
rising, deviation
from nominal
threshold (V
TH
)
(Table 1)
T
A
= +25°C
-2
-5
1
122
CONDITIONS
MIN
40
TYP
50
±240
5
5
+2
%
+5
%
µs
MAX
60
UNITS
%
ps
ns
ns
MAX7382
Power-On-Reset Hysteresis
Power-On-Reset Delay
RESET OUTPUT (RST)
PORdly
Difference between rising and falling
thresholds
V
CC
rising from 0 to 5V in 1µs at +25°C
V
CC
= 4.5V, I
SOURCE
= 7.0mA
(MAX7382xMxx)
Output High Voltage (Note 4)
V
OH
V
CC
= 3.0V, I
SOURCE
= 2.0mA
(MAX7382xSxx)
V
CC
= 4.5V, I
SINK
= 20mA (MAX7382xMxx)
V
CC
= 3.0V, I
SINK
= 10mA (MAX7382xSxx)
V
CC
-
0.4
V
Output Low Voltage
V
OL
0.4
V
Note 1:
Note 2:
Note 3:
Note 4:
All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Oscillator is enabled when V
CC
> V
TH
.
Guaranteed by design. Not production tested.
For push-pull output only.
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3
Silicon Oscillator with Reset Output
and Enable
MAX7382
Typical Operating Characteristics
(V
CC
= V
ENABLE
= 5V, T
A
= +25°C, frequency = 10MHz, unless otherwise noted.)
DUTY CYCLE vs. TEMPERATURE
MAX7382 toc01
DUTY CYCLE
vs. SUPPLY VOLTAGE
MAX7382 toc02
SUPPLY CURRENT vs. TEMPERATURE
MAX7382 toc03
50.5
51
FREQUENCY = 11MHz
50
DUTY CYCLE (%)
49
48
47
46
45
3.25
3.20
SUPPLY CURRENT (mA)
3.15
3.10
FREQUENCY = 10MHz
3.05
3.00
2.95
2.90
50.0
DUTY CYCLE (%)
49.5
FREQUENCY = 10MHz
49.0
48.5
48.0
-55
-17
21
59
97
135
TEMPERATURE (°C)
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
-55
-17
21
59
97
135
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX7382 toc04
FREQUENCY DEVIATION
vs. SUPPLY VOLTAGE
FREQUENCY = 11MHz
1.5
FREQUENCY DEVIATION (%)
1.0
0.5
0
-0.5
-1.0
-1.5
MAX7382 toc05
FREQUENCY DEVIATION
vs. TEMPERATURE
FREQUENCY = 10MHz
3
FREQUENCY DEVIATION (%)
2
1
0
-1
-2
-3
-4
MAX7382 toc06
4.0
FREQUENCY = 11MHz
3.5
SUPPLY CURRENT (mA)
2.0
4
3.0
2.5
2.0
1.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
SUPPLY VOLTAGE (V)
-2.0
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
TEMPERATURE (°C)
SETTLING TIME FROM START
MAX7382 toc07
CLOCK OUTPUT WAVEFORM
(C
L
= 10pF)
CLOCK OUTPUT WAVEFORM
(C
L
= 10pF)
MAX7382 toc08
MAX7382 toc09
CH1 FREQ
9.992MHz
LOW RESOLUTION
CH2
2V/div
2V/div
CH1
2V/div
2V/div
10µs/div
CHANNEL 1 = CLOCK, CHANNEL 2 = V
CC
20ns/div
20ns/div
4
_______________________________________________________________________________________
Silicon Oscillator with Reset Output
and Enable
MAX7382
Typical Operating Characteristics (continued)
(V
CC
= V
ENABLE
= 5V, T
A
= +25°C, frequency = 10MHz, unless otherwise noted.)
CLOCK OUTPUT WAVEFORM
(C
L
= 100pF)
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX7382 toc11
MAX7382 toc10
SUPPLY CURRENT
vs. FREQUENCY
MAX7382 toc12
1
MAXIMUM TRANSIENT DURATION (s)
0.1
10m
1m
100µ
10µ
1µ
0.04
V
RESET
= 4.32V
5
SUPPLY CURRENT (mA)
0.24
4
3
2V/div
2
1
0.09
0.14
0.19
10
11
12
13
14
15
16
RESET THRESHOLD OVERDRIVE (V)
FREQUENCY (MHz)
20ns/div
Pin Description
PIN
1
2
3
4
5
NAME
CLOCK
GND
RST
V
CC
ENABLE
Push-Pull Clock Output
Ground
Reset Output. Open-drain or push-pull output. See the
Ordering Information.
Positive Supply Voltage. Bypass V
CC
to GND with a 0.1µF capacitor.
Active High Clock Enable Input. See the
ENABLE Input
section for more details.
FUNCTION
Detailed Description
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.
operating voltage range and does not generate short
output cycles during either power-on or changing of the
frequency. A typical oscillating startup is shown in the
Typical Operating Characteristics.
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
CC
> V
TH
(Table 1) and drives a load to within 400mV of either
supply rail. The clock output remains stable over the full
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