General Description

The MAX7383 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

MAX7383 features a factory-programmed high-speed

oscillator, a 32.768kHz oscillator, and a clock-selector

input. 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 provide glitch-free clock switching.

Unlike typical crystal and ceramic-resonator oscillator

circuits, the MAX7383 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

MAX7383 is a good choice for demanding home appli-

ance and automotive environments.

The MAX7383 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 MAX7377 data sheet

for frequencies less than 10MHz.

The MAX7383 is available in a 5-pin SOT23 package.

The MAX7383 standard operating temperature range is

-40°C to +125°C. See the Applications Information sec-

tion for extended operating temperature range.

Applications

White Goods

Automotive

Consumer Products

Appliances and Controls

Handheld Products

Portable Equipment

Microcontroller Systems

Features

♦ 2.7V to 5.5V Operation

♦ High-Speed Oscillator from 10MHz to 32MHz

Low-Speed 32kHz Oscillator

Glitch-Free Clock-Speed Switching

♦ ±10mA Clock-Output Drive Capability

♦ 2.5% Initial Accuracy

♦ ±50ppm/°C (typ) Frequency Drift

♦ 50% Duty Cycle

♦ 5ns Output Rise and Fall Time

♦ 4mA Operating Current at 16MHz

♦ 13µA, 32kHz Operating Current

♦ -40°C to +125°C Temperature Range

♦ Small 5-Pin SOT23 Package

Silicon Oscillator with Low-Power

Frequency Switching

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

OSC1

OSC2

µC

GND

CLOCK

E.C.

0.1

µF

MAX7383

I/O PORT

SPEED

Typical Operating Circuit

19-3492; Rev 0; 1/05

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.

PART*

TEMP RANGE

PIN-

PACKAGE

RESET

OUTPUT

MAX7383AX _ _-T -40

°C to +125°C 5 SOT23-5

Active high

push-pull

*The first two letters are AX. Insert the two-letter code from

Table 2 in the remaining two positions for the desired frequen-

cy range. Insert the two-letter code from Table 1 in the remain-

ing two positions for the desired frequency range. Table 1 is

located at the end of the data sheet.

Pin Configuration appears at end of data sheet.