19-3491; Rev 0; 1/05
Silicon Oscillator with Reset Output
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 and a microprocessor (µP) power-
on-reset (POR) supervisor.
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 as standard, the
MAX7382 is a good choice for demanding home appli-
ance and automotive environments.
The MAX7382 is available with factory-programmed fre-
quencies ranging from 10MHz to 32MHz. See Table 2
for standard frequencies and contact the factory for
custom frequencies. Refer to the MAX7376 data sheet
for frequencies less than 10MHz.
The MAX7382 is available in a 5-pin SOT23 package.
The MAX7382 standard operating temperature range is
-40°C to +125°C. See the
Applications Information
sec-
tion for extended operating temperature range.
♦
2.7V to 5.5V Operation
♦
10MHz to 32MHz Oscillator
♦
Integrated POR
♦
±10mA Clock Output Drive Capability
♦
2.5% Initial Accuracy
♦
±50ppm/°C Frequency Drift
♦
50% Duty Cycle
♦
5ns Output Rise and Fall Time
♦
Low Jitter: 80ps
P-P
at 16MHz
♦
4mA Operating Current at 16MHz
♦
-40°C to +125°C Temperature Range
♦
Small 5-Pin SOT23 Package
Features
MAX7382
Ordering Information
PART*
TEMP RANGE
PIN-
PACKAGE
RESET
OUTPUT
Active-high
MAX7382A_ _ _-T -40°C to +125°C 5 SOT23-5 push-pull
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
Applications
White Goods
Automotive
Consumer Products
Appliances and Controls
Handheld Products
Portable Equipment
Microcontroller Systems
*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
E.C.
RST/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
MAX7382
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +6.0V
All Other Pins to GND...................................-0.3V to (V+ + 0.3V)
CLOCK, RST Current .......................................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C) ....571mW (U5-2)
Operating 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
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
= 2.7V to 5.5V, V
L
= V
CC
, T
A
= -40°C to +125°C. Typical values are at V
CC
= 5.0V, T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
Operating Supply Voltage
SYMBOL
V
CC
f
CLOCK
= 16MHz, T
A
= -40°C to +125°C,
no load
f
CLOCK
= 14.7456MHz, T
A
= -40°C to
+125°C, no load
Operating Supply Current
I
CC
f
CLOCK
= 12MHz, T
A
= -40°C to +125°C,
no load
f
CLOCK
= 11.0592MHz, T
A
= -40°C to
+125°C, no load
f
CLOCK
= 10MHz, T
A
= -40°C to +125°C,
no load
CLOCK OUTPUT
Output High Voltage
Output Low Voltage
V
OH
V
OL
V
L
= 4.5V, I
SOURCE
= 7.0mA
V
L
= 2.7V, I
SOURCE
= 2.0mA
V
L
= 4.5V, I
SINK
= 20mA
V
L
= 2.7V, I
SINK
= 10mA
V
CC
= 5V, T
A
= +25°C, deviation from
selected frequency
Clock Frequency Accuracy
f
CLOCK
V
CC
= 2.7V to 5.5V, T
A
= +25°C,
deviation from selected frequency
T
A
= -40°C to +125°C
(Note 2)
40
-2.5
-5.0
±50
50
V
L
- 0.4
0.4
+2.5
%
+3.5
±350
60
ppm/°C
%
V
V
CONDITIONS
MIN
2.7
TYP
MAX
5.5
8.7
8.0
6.5
6.0
5.4
mA
UNITS
V
Clock Temperature Coefficient
Duty Cycle
2
_______________________________________________________________________________________
Silicon Oscillator with Reset Output
ELECTRICAL CHARACTERISTICS (continued)
(Typical
Operating Circuit,
V
CC
= 2.7V to 5.5V, V
L
= V
CC
, T
A
= -40°C to +125°C. Typical values are at V
CC
= 5.0V, T
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER
Output Jitter
Output Rise Time
Output Fall Time
Power-On-Reset Threshold
t
R
t
F
V
TH
SYMBOL
CONDITIONS
Observation of 16MHz for 20s using a
12GHz oscilloscope
10% to 90%
90% to 10%
V
CC
rising, deviation
from nominal threshold
T
A
= +25°C
T
A
= -40°C to
+125°C
-2
-5
1
122
V
CC
-
0.4
V
V
L
= 2.7V, I
SOURCE
= 2.0mA
Output Low Voltage
V
OL
V
L
= 4.5V, I
SINK
= 20mA
V
L
= 2.7V, I
SOURCE
= 10mA
V
CC
-
0.4
0.4
0.4
V
MIN
TYP
80
5
5
+2
+5
%
MAX
UNITS
ps
P-P
ns
ns
MAX7382
Reset Hysteresis
Power-On-Reset Delay
RESET OUTPUT
Output High Voltage
(Note 3)
HYST
POR
DLY
Difference between rising and falling
thresholds
V
CC
rising from 0 to 5V in 1µs at +25°C
%
µs
V
L
= 4.5V, I
SOURCE
= 7.0mA
V
OH
Note 1:
All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2:
Guaranteed by design. Not production tested.
Note 3:
For push-pull output only.
_______________________________________________________________________________________
3
Silicon Oscillator with Reset Output
MAX7382
Typical Operating Characteristics
(V
CC
= V
L
= 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 = 11.0592MHz
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 = 11.0592MHz
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 = 11.0592MHz
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
10µs/div
CHANNEL 1 = CLOCK, CHANNEL 2 = V
CC
20ns/div
20ns/div
4
_______________________________________________________________________________________
Silicon Oscillator with Reset Output
Typical Operating Characteristics (continued)
(V
CC
= V
L
= 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
MAX7382 toc10
SUPPLY CURRENT
vs. FREQUENCY
MAX7382 toc12
1
MAXIMUM TRANSIENT DURATION (s)
0.1
0.01
1m
10m
100m
1µ
0.04
V
RESET
= 4.32V
5
SUPPLY CURRENT (mA)
0.24
4
3
2
20ns/div
1
0.09
0.14
0.19
10
11
12
13
14
15
16
RESET THRESHOLD OVERDRIVE (V)
FREQUENCY (MHz)
Pin Description
PIN
1
2
3
4
5
NAME
CLOCK
GND
RST
V
CC
E.C.
Push-Pull Clock Output
Ground
Reset Output. Open-drain or push-pull output. See the
Ordering Information.
Positive Supply Voltage. Bypass with a 0.1µF capacitor to GND.
Externally Connected. Connect to Vcc.
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. A variety of popular standard frequencies
are available; see Table 2. No external components are
required for setting or adjusting the frequency.
Oscillator
The push-pull clock output drives a load to within
400mV of either supply rail. The clock output remains
stable over the full operating voltage range and does
not generate short output cycles during either power-on
or changing of the frequency. A typical oscillating start-
up is shown in the
Typical Operating Characteristics.
_______________________________________________________________________________________
5
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