19-3493; Rev 2; 4/07
Silicon Oscillator with Low-Power Frequency
Select, Reset Output, and Enable
General Description
The MAX7384 dual-speed silicon oscillator replaces
ceramic resonators, crystals, and crystal-oscillator
modules as the primary and secondary clock source for
microcontrollers in 3V, 3.3V, and 5V applications. The
MAX7384 features a factory-programmed high-speed
oscillator, a 32.768kHz oscillator, a clock enable input,
a clock-selector input, and a µP power-on-reset (POR)
supervisor. The clock output can be switched at any
time between the high-speed clock and the 32.768kHz
clock for low-power operation. Switchover is synchro-
nized internally to provide glitch-free clock switching.
Unlike typical crystal and ceramic-resonator oscillator
circuits, the MAX7384 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 oper-
ating temperature range as the MAX7384 is a good
choice for demanding home appliance, industrial, and
automotive environments.
The MAX7384 is available with factory-programmed fre-
quencies ranging from 10MHz to 16MHz. See Table 1
for standard frequencies and contact the factory for
custom frequencies and POR thresholds.
The MAX7384 is available in an 8-pin µMAX
®
package.
The MAX7384 operating temperature range is -40°C to
+125°C.
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Features
2.7V to 5.5V Operation
High-Speed Oscillator from 10MHz to 16MHz
Low-Speed 32.768kHz Oscillator
Glitch-Free Clock-Speed Switching
Integrated POR (Factory Programmable)
±10mA Clock-Output Drive Capability
2.5% Initial Accuracy
Typical 4.5mA Operating Current at 16MHz
Typical 0.5µA Shutdown Supply Current
Typical 13µA Operating Current at 32.768kHz
±100ppm/°C Frequency Drift
Clock Enable Input
50% Duty Cycle
5ns Output Rise and Fall Time
-40°C to +125°C Temperature Range
MAX7384
Ordering Information
PART*
MAX7384B_ _ _
MAX7384C_ _ _
TEMP RANGE
PIN-
PACKAGE
RESET
OUTPUT
Active low
push-pull
Open drain
-40°C to +125°C 8 µMAX
-40°C to +125°C 8 µMAX
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 Application Circuit
V
CC
2.7V TO 5.5V
0.1µF
0.1µF
V
CC
V
L
CLOCK
OSC1
OSC2
MAX7384
ENABLE
RST
SPEED
GND
RST
µC
I/O PORT
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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 Low-Power Frequency
Select, Reset Output, and Enable
MAX7384
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 (SPEED, ENABLE) ......................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) ...362mW (U8-1)
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
= 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.) (Notes 1 and 2)
PARAMETER
Operating Supply Voltage
SYMBOL
V
CC
, V
L
f
CLOCK
= 16MHz, V
CC
= 5.5V, no load
f
CLOCK
= 14MHz, V
CC
= 5.5V, no load
Operating Supply Current
I
CC
+ I
L
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
f
CLOCK
= 32.768kHz, V
CC
= 5.5V, no load
Shutdown Supply Current
LOGIC INPUTS (SPEED, 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
MAX7384xSxx
V
CC
= 4.5V, I
SINK
= 20mA
V
CC
= 3.0V, I
SINK
= 10mA
V
CC
= 5V (for MAX7384xMxx) or V
CC
= 3.3V
(for MAX7384xSxx), T
A
= +25°C, deviation
from nominal frequency
V
CC
= 3.0V to 5.5V, T
A
= +25°C, deviation
from nominal frequency
Fast Clock Temperature
Coefficient
Slow Clock Frequency
f
CLOCK
(Note 3)
V
CC
= 5V (for MAX7384xMxx) or V
CC
= 3.3V
(for MAX7384xSxx), T
A
= +25°C
V
CC
= 3.0V to 5.5V, T
A
= +25°C
32.268
31.768
-2.5
V
CC
- 0.4
0.4
V
V
IH
V
IL
I
IN
V
CC
= V
SPEED
= V
ENABLE
= 5.5V
0.7
x V
CC
0.3
x V
CC
2
V
V
µA
I
SHDN
ENABLE = 0V; I
SHDN
= I
CC
+ I
L
13
0.5
CONDITIONS
MIN
2.7
TYP
MAX
5.5
8.7
8.0
6.5
6.0
5.4
25
1
µA
µA
mA
UNITS
V
Output Low Voltage
V
OL
V
+2.5
%
Fast Clock Frequency Accuracy
f
CLOCK
-5.0
±100
32.768
32.768
+3.5
±550
33.268
33.768
ppm/°C
kHz
2
_______________________________________________________________________________________
Silicon Oscillator with Low-Power Frequency
Select, Reset Output, and Enable
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.) (Notes 1 and 2)
PARAMETER
Slow Clock Temperature
Coefficient
Duty Cycle
Output Period Jitter
Output Rise Time
Output Fall Time
Power-On-Reset Threshold
Accuracy
Power-On-Reset Hysteresis
Power-On-Reset Delay
RESET OUTPUT (RST)
V
CC
= 4.5V, I
SOURCE
= 7.0mA
(MAX7384xMxx)
Output High Voltage (Note 4)
V
OH
V
CC
= 3.0V, I
SOURCE
= 2.0mA
(MAX7384xSxx)
V
CC
= 4.5V, I
SINK
= 20mA (MAX7384xMxx)
V
CC
= 3.0V, I
SINK
= 10mA (MAX7384xSxx)
V
CC
- 0.4
PORdly
J
P
t
R
t
F
SYMBOL
(Note 3)
(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
40
CONDITIONS
MIN
TYP
±50
50
±240
5
5
+2
+5
%
MAX
±325
60
UNITS
ppm/°C
%
ps
ns
ns
MAX7384
Difference between rising and falling
thresholds
V
CC
rising from 0 to 5V in 1µs at +25°C
%
µs
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.
_______________________________________________________________________________________
3
Silicon Oscillator with Low-Power Frequency
Select, Reset Output, and Enable
MAX7384
Typical Operating Characteristics
(V
CC
= V
L
= V
ENABLE
= V
SPEED
= 5V, T
A
= +25°C, frequency = 10MHz, unless otherwise noted.)
DUTY CYCLE vs. SUPPLY VOLTAGE
MAX7384 toc02
MAX7384 toc01
DUTY CYCLE vs. TEMPERATURE
50.5
51
SUPPLY CURRENT vs. TEMPERATURE
MAX7384 toc03
3.25
3.20
SUPPLY CURRENT (mA)
3.15
3.10
FREQUENCY = 10MHz
3.05
3.00
2.95
2.90
FREQUENCY = 11MHz
50
DUTY CYCLE (%)
49
48
47
46
45
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
MAX7384 toc04
FREQUENCY DEVIATION
vs. SUPPLY VOLTAGE
FREQUENCY = 11MHz
1.5
FREQUENCY DEVIATION (%)
1.0
0.5
0
-0.5
-1.0
-1.5
MAX7384 toc05
FREQUENCY DEVIATION
vs. TEMPERATURE
FREQUENCY = 10MHz
3
FREQUENCY DEVIATION (%)
2
1
0
-1
-2
-3
-4
MAX7384 toc06
4.0
FREQUENCY = 11MHz
3.5
SUPPLY CURRENT (mA)
2.0
4
3.0
2.5
2.0
-2.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
1.5
-55
-17
21
59
97
135
TEMPERATURE (°C)
SETTLING TIME FROM START
MAX7384 toc07
CLOCK OUTPUT WAVEFORM
(C
L
= 10pF)
MAX7384 toc08
CLOCK OUTPUT WAVEFORM
(C
L
= 50pF)
MAX7384 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 Low-Power Frequency
Select, Reset Output, and Enable
MAX7384
Typical Operating Characteristics (continued)
(V
CC
= V
L
= V
ENABLE
= V
SPEED
= 5V, T
A
= +25°C, frequency = 10MHz, unless otherwise noted.)
CLOCK OUTPUT WAVEFORM
(C
L
= 100pF)
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX7384 toc11
SUPPLY CURRENT vs. FREQUENCY
5
1
MAXIMUM TRANSIENT DURATION (s)
0.1
10m
1m
100µ
10µ
1µ
0.04
MAX7384 toc10
SUPPLY CURRENT (mA)
4
2V/div
3
V
RESET
= 4.32V
2
1
20ns/div
10
11
12
13
14
15
16
FREQUENCY (MHz)
0.09
0.14
0.19
0.24
RESET THRESHOLD OVERDRIVE (V)
HIGH-SPEED TO LOW-SPEED
TRANSITION
MAX7384 toc13
HIGH-SPEED TO LOW-SPEED
TRANSITION
MAX7384 toc14
LOW-SPEED TO HIGH-SPEED
TRANSITION
MAX7384 toc15
2V/div
2V/div
CH2
CH2
2V/div
2V/div
CH1
CH1
10µs/div
CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED
40ns/div
CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED
10µs/div
CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED
LOW-SPEED TO HIGH-SPEED
TRANSITION
MAX7384 toc16
CH2
2V/div
CH1
2V/div
100ns/div
CHANNEL 1 = CLOCK, CHANNEL 2 = SPEED
MAX7384 toc12
2V/div
CH2
2V/div
CH1
_______________________________________________________________________________________
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