19-3493; Rev 1; 2/05
Silicon Oscillator with Low-Power Frequency
Switching and Reset Output
General Description
Features
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-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 synchronized internally to pro-
vide glitch-free clock switching.
♦ 2.7V to 5.5V Operation
♦ High-Speed Oscillator from 10MHz to 32MHz
Low-Speed 32kHz Oscillator
Glitch-Free Clock-Speed Switching
♦ Integrated POR
♦
10mꢀ Clock-Oꢁtpꢁt ꢂriꢃe Capaꢄilitꢅ
♦ 2.5% Initial ꢀccꢁracꢅ
50ppmꢆ/C Freꢇꢁencꢅ ꢂrift
♦
♦ 50% ꢂꢁtꢅ Cꢅcle
♦ 5ns Oꢁtpꢁt Rise and Fall Time
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 standard, the MAX7384 is a
good choice for demanding home appliance, industrial,
and automotive environments.
♦ Low Jitter: 80ps
at 16MHz
P-P
♦ 4mꢀ Operating Cꢁrrent at 16MHz
♦ 13µꢀ, 32kHz Operating Cꢁrrent
♦ -40/C to +125/C Temperatꢁre Range
Ordering Information
PIN-
PꢀCKꢀGE
RESET
OUTPUT
The MAX7384 is available with factory-programmed fre-
quencies ranging from 10MHz to 32MHz. See Table 1
for standard frequencies and contact the factory for
custom frequencies. Refer to the MAX7378 data sheet
for frequencies less than 10MHz.
PꢀRT*
TEMP RꢀNGE
Active high
push-pull
MAX7384A_ _ _ -40°C to +125°C 8 µMAX
Active low
push-pull
®
The MAX7384 is available in an 8-pin µMAX package.
MAX7384B_ _ _ -40°C to +125°C 8 µMAX
MꢀX7384C_ _ _ -40°C to +125°C 8 µMꢀX
The MAX7384 standard operating temperature range is
-40°C to +125°C. See the Applications Information sec-
tion for extended operating temperature range.
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.
Applications
White Goods
Automotive
Consumer Products
Typical Application Circuit
Appliances and Controls
Handheld Products
V
2.7V TO 5.5V
CC
Portable Equipment
0.1µF
0.1µF
Microcontroller Systems
V
CC
V
L
OSC1
CLOCK
OSC2
RST
MAX7384
GND
E.C.
RST/RST
SPEED
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.