Rainbow Electronics MAX7375 User Manual

General Description

The MAX7375 is a silicon oscillator, intended as a lowcost improvement to replace ceramic resonators, crystals, and crystal oscillator modules used as the clock source for microcontrollers and UARTs in 3V, 3.3V, and 5V applications.

The MAX7375 is a fully integrated oscillator, supplied at specific factory-trimmed frequencies with a Rail-toRail® 50% duty cycle square-wave output. The oscillator frequency is generated directly without the use of a phase-locked loop (PLL). No additional components are used for setting or adjusting the frequency.

Unlike typical crystal and ceramic resonator oscillator circuits, the MAX7375 is resistant to vibration and EMI. The high output drive current and absence of highimpedance nodes make the oscillator less susceptible to dirty or humid operating conditions. With a wide operating temperature range, the oscillator is a good choice for demanding home appliance and automotive environments.

The MAX7375 is offered in space-saving 3-pin SC70 and SOT23 packages. All parts are guaranteed to operate over the -55°C to +135°C temperature range and are specified from -40°C to +125°C.

Applications

White Goods Portable Equipment

Automotive Microcontroller Systems

Appliances and Controls

Hand-Held Products

Features

♦ 2.7V to 5.5V Operation ♦ Factory-Trimmed Oscillator ♦ No External Components Required ♦ ±10mA Output Drive Current ♦ 2% Initial Accuracy ♦ ±50ppm/°C Temp Drift ♦ Fast Startup Time: 5µs ♦ 45% to 55% Maximum Duty Cycle ♦ 5ns Output Rise and Fall Time ♦ No PLL ♦ Low Jitter: 160ps

P-P

at 8MHz

♦ Tiny Surface-Mount Package (SC70, SOT23) ♦ -40°C to +125°C Temperature Range

MAX7375

3-Pin Silicon Oscillator

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3060; Rev 0; 10/03

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.

Pin Configuration

MAX7375

OSC1

OSC2

2.7V TO 5.5V

V+

GND

CLOCK

µC

Typical Application Circuit

Selector Guide appears at end of data sheet.

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd,

*Future product—contact factory for availability.

PART TEMP RANGE PIN-PACKAGE

MAX7375AXR105-T* -40°C to +125°C 3 SC70-3

MAX7375AXR185-T* -40°C to +125°C 3 SC70-3

MAX7375AXR365-T -40°C to +125°C 3 SC70-3

MAX7375AXR375-T -40°C to +125°C 3 SC70-3

MAX7375AXR405-T -40°C to +125°C 3 SC70-3

MAX7375AXR425-T -40°C to +125°C 3 SC70-3

MAX7375AXR805-T -40°C to +125°C 3 SC70-3

MAX7375AUR105-T* -40°C to +125°C 3 SOT23-3

MAX7375AUR185-T* -40°C to +125°C 3 SOT23-3

MAX7375AUR365-T -40°C to +125°C 3 SOT23-3

MAX7375AUR375-T -40°C to +125°C 3 SOT23-3

MAX7375AUR405-T -40°C to +125°C 3 SOT23-3

MAX7375AUR425-T -40°C to +125°C 3 SOT23-3

MAX7375AUR805-T -40°C to +125°C 3 SOT23-3

TOP VIEW

V+

CLOCK

MAX7375AXR

2V+

SC70

3 GND

CLOCK

MAX7375AUR

SOT23

3 GND

MAX7375

3-Pin Silicon Oscillator

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = 2.7V to 5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = 5V, TA= +25°C.) (Note 1)

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.

Note 1: All parameters are tested at TA= +25°C. Specifications over temperature are guaranteed by design and characterization. Note 2: Typical frequencies are nominal values. Note 3: Guaranteed by design and characterization. Not production tested.

V+ to GND ................................................................-0.3V to +6V

CLOCK to GND ............................................-0.3V to (V+ + 0.3V)

Continuous Power Dissipation (T

= +70°C)

3-Pin SC70 (derate 2.9mW/°C over +70°C).................235mW

3-Pin SOT23 (derate 4mW/°C over +70°C...................320mW

Operating Temperature Range .........................-40°C to +125°C

Functional 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

Operating Supply Voltage V+ 2.7 5.5 V

Operating Supply Current I

Output High Voltage V

Output Low Voltage V

Initial CLOCK Frequency f

CLOCK Frequency Temperature Sensitivity

Duty Cycle (Note 3) 45 52 57 %

Output Jitter

Output Rise Time t

Output Fall Time t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX7375A_R405 2.0 4.2

MAX7375A_R805 3.2 6.4

CLOCK

V+ ≥ 2.7V, I

V+ ≥ 4.5V, I

V+ ≥ 2.7, I

V+ ≥ 4.5V, I

V+ = 3.0V, T

V+ = 2.7V to 5.5V, T

(Note 3) ±50 ±325 ppm/°C

Observation for 20s using a 500MHz oscilloscope (MAX7375A_R805)

(Note 3) 5.0 ns

(Note 3) 2.5 ns

SINK

= +25°C (Note 2)

= 2.5mA V+ - 0.4

SOURCE

= 9mA V+ - 0.4

SOURCE

= 10mA 0.4

= 20mA 0.4

SINK

MAX7375A_R_

_ _ -2% +2%

_ _ -4% +4%

160 ps

MHz

P-P

MAX7375

3-Pin Silicon Oscillator

_______________________________________________________________________________________ 3

Typical Operating Characteristics

(V+ = 5V, TA= +25°C, CL= 10pF, 8MHz output, unless otherwise noted.)

DUTY CYCLE vs. TEMPERATURE

DUTY CYCLE (%)

-40 125 TEMPERATURE (°C)

SUPPLY CURRENT vs. SUPPLY VOLTAGE

4.0

3.5

3.0

MAX7375 toc01

1109565 80-10 5 20 35 50-25

MAX7375 toc04

DUTY CYCLE vs. SUPPLY VOLTAGE

DUTY CYCLE (%)

2.7 5.5 SUPPLY VOLTAGE (V)

FREQUENCY vs. SUPPLY VOLTAGE

1.002

1.000

0.998

SUPPLY CURRENT vs. TEMPERATURE

4.0

3.5

MAX7375 toc02

3.0

2.5

2.0

1.5

SUPPLY CURRENT (mA)

1.0

0.5

4.84.13.4

-40 125

V+ = 2.7V

TEMPERATURE (°C)

FREQUENCY vs. TEMPERATURE

1.010

MAX7375 toc05

1.005

V+ = 5V

MAX7375 toc03

V+ = 3.3V

1109565 80-10 5 20 35 50-25

MAX7375 toc06

2.5

2.0

SUPPLY CURRENT (mA)

1.5

1.0

2.7 5.5 SUPPLY VOLTAGE (V)

SETTLING TIME FROM START

0.996

0.994

NORMALIZED FREQUENCY

0.992

4.84.13.4

0.990

2.7 5.5 SUPPLY VOLTAGE (V)

4.84.13.4

1.000

NORMALIZED FREQUENCY

0.995

0.990

-40 125 TEMPERATURE (°C)

1109565 80-10 5 20 35 50-25

CLOCK OUTPUT WAVEFORM

= 10pF

WITH C

40ns/div

MAX7375 toc08

V+ = 3.3V

CLOCK 1V/div

1µs/div

MAX7375 toc07

V+ = 3.3V

CLOCK 2V/div

V+ 2V/div

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