MAXIM MAX7382 User Manual

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General Description

The MAX7382 silicon oscillator replaces ceramic resonators, crystals, and crystal-oscillator modules as the clock source for microcontrollers in 3V, 3.3V, and 5V applications. The MAX7382 features a factory-programmed oscillator and a microprocessor (µP) poweron-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 highimpedance 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 appliance and automotive environments.

The MAX7382 is available with factory-programmed frequencies 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 section 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

♦ 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

MAX7382

Silicon Oscillator with Reset Output

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

OSC1

OSC2

RST

µC

GND

RST/RST

CLOCK

E.C.

0.1µF

2.7V TO 5.5V

MAX7382

Typical Operating Circuit

19-3491; 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.

*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.

Pin Configuration appears at end of data sheet.

PART* TEMP RANGE

MAX7382A_ _ _-T -40°C to +125°C 5 SOT23-5

MAX7382B_ _ _-T -40°C to +125°C 5 SOT23-5

MAX7382C_ _ _-T -40°C to +125°C

PINPACKAGE

5 SOT23-5 Open drain

RESET

OUTPUT

Active-high push-pull

Active-low push-pull

MAX7382

Silicon Oscillator with Reset Output

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

VCCto 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

= +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

ELECTRICAL CHARACTERISTICS

(Typical Operating Circuit, VCC= 2.7V to 5.5V, VL= VCC, TA= -40°C to +125°C. Typical values are at VCC= 5.0V, TA= +25°C, unless otherwise noted.) (Note 1)

Operating Supply Voltage V

Operating Supply Current I

CLOCK OUTPUT

Output High Voltage V

Output Low Voltage V

Clock Frequency Accuracy f

Clock Temperature Coefficient TA = -40°C to +125°C ±50 ±350 ppm/°C

Duty Cycle (Note 2) 40 50 60 %

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= 16MHz, TA = -40°C to +125°C,

CLOCK

no load

= 14.7456MHz, TA = -40°C to

CLOCK

+125°C, no load

= 12MHz, TA = -40°C to +125°C,

CLOCK

no load

= 11.0592MHz, TA = -40°C to

CLOCK

+125°C, no load

= 10MHz, TA = -40°C to +125°C,

CLOCK

no load

VL = 4.5V, I

VL = 2.7V, I

VL = 4.5V, I

VL = 2.7V, I

VCC = 5V, TA = +25°C, deviation from selected frequency

VCC = 2.7V to 5.5V, TA = +25°C, deviation from selected frequency

SOURCE

SINK

2.7 5.5 V

8.7

8.0

6.5

6.0

5.4

= 7.0mA

= 2.0mA

= 20mA

= 10mA

- 0.4 V

0.4 V

-2.5 +2.5

-5.0 +3.5

MAX7382

Silicon Oscillator with Reset Output

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Typical Operating Circuit, VCC= 2.7V to 5.5V, VL= VCC, TA= -40°C to +125°C. Typical values are at VCC= 5.0V, TA= +25°C, unless otherwise noted.) (Note 1)

Note 1: All parameters tested at TA= +25°C. Specifications over temperature are guaranteed by design. Note 2: Guaranteed by design. Not production tested. Note 3: For push-pull output only.

Output Jitter

Output Rise Time t

Output Fall Time t

Power-On-Reset Threshold V

Reset Hysteresis HYST

Power-On-Reset Delay POR

RESET OUTPUT

Output High Voltage (Note 3)

Output Low Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DLYVCC

Observation of 16MHz for 20s using a 12GHz oscilloscope

10% to 90% 5 ns

90% to 10% 5 ns

VCC rising, deviation from nominal threshold

Difference between rising and falling thresholds

rising from 0 to 5V in 1µs at +25°C 122 µs

VL = 4.5V, I

VL = 2.7V, I

VL = 4.5V, I

VL = 2.7V, I

SOURCE

= 20mA 0.4

SINK

SOURCE

TA = +25°C -2 +2

= -40°C to

+125°C

= 7.0mA

= 2.0mA

= 10mA 0.4

-5 +5

0.4

80 ps

P-P

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