MAX7375AXR405+T - Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

The MAX7375 is a silicon oscillator, intended as a low-

cost improvement replacing ceramic resonators, crys-

tals, 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-to-rail

50% duty cycle square-wave output. The oscillator fre-

quency is generated directly without the use of a

phase-locked loop (PLL). No additional components

are used to set or adjust the frequency.

Unlike typical crystal and ceramic resonator oscillator

circuits, the MAX7375 is highly resistant to vibration

and EMI. The high output drive current and absence of

high-impedance nodes also makes 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 auto-

motive environments.

Available in 3-pin space-saving SC70 package, the

MAX7375 is offered in standard and nonstandard fac-

tory-set frequencies ranging from 600kHz to 9.99MHz.

See the MAX7381 data sheet for frequencies ≥10MHz.

The MAX7375’s standard operating temperature range

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

section for extended operating temperature range.

Applications

White Goods Portable Equipment

Automotive Microcontroller Systems

Appliances and Controls

Hand-Held Products

Features

♦2.7V to 5.5V Operation

♦Factory-Trimmed Oscillator (600kHz to 9.99MHz)

♦No External Components Required

♦±10mA Output Drive Current

♦2% Initial Accuracy

♦±50ppm/°C Temp Drift

♦Fast Startup Time: 5µs

♦40% to 60% Maximum Duty Cycle

♦5ns Output Rise and Fall Time-Low EMI

♦Very Low EMI Susceptibility-No High-Impedance

Nodes

♦Very Low Jitter: 160psP-P at 8MHz

♦Tiny Surface-Mount Package (SC70)

♦-40°C to +125°C Temperature Range

MAX7375

3-Pin Silicon Oscillator

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3060; Rev 3; 12/07

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

MAX7375

OSC1

OSC2

2.7V TO 5.5V

V+

GND

CLOCK µC

Typical Application Circuit

Pin Configuration and Selector Guide appear at end of data

sheet.

Note: The MAX7375 is available in factory-set frequencies from

600kHz to 9.99MHz. There are seven standard versions (1MHz,

1.84MHz, 3.58MHz, 3.69MHz, 4MHz, 4.19MHz, and 8MHz, as

shown in the Selector Guide) with a required 2.5k order incre-

ment. Nonstandard frequencies are also available with a required

10k order increment. For nonstandard versions, contact factory

for availability and ordering information. All versions available in

tape-and-reel only.

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, unless otherwise noted.)

(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.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Operating Supply Voltage V+ 2.7 5.5 V

MAX7375A_R105 0.55 1.1

MAX7375A_R185 0.8 1.25

MAX7375A_R405 1.7 4.2

Operating Supply Current I+

MAX7375A_R805 3.2 6.4

V+ ≥ 2.7V, ISOURCE = 2.5mA V+ - 0.4

Output High Voltage VOH V+ ≥ 4.5V, ISOURCE = 9mA V+ - 0.4 V

V+ ≥ 2.7, ISINK = 10mA 0.4

Output Low Voltage VOL V+ ≥ 4.5V, ISINK = 20mA 0.4 V

V+ = 3.0V,

TA = +25°C (Note 2) MAX7375A_R_ _ _-2 +2

Initial CLOCK Frequency

Accuracy fCLOCK V+ = 2.7V to 5.5V,

TA = +25°C (Note 2) MAX7375A_R_ _ _-4 +4

CLOCK Frequency Temperature

Sensitivity (Note 3) ±50 ±325 ppm/°C

Duty Cycle (Note 3) 45 52 57 %

Output Jitter Observation for 20s using a 500MHz

oscilloscope (MAX7375A_R805) 160 psP-P

Output Rise Time tR(Note 3) 5.0 ns

Output Fall Time tF(Note 3) 2.5 ns

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

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

Continuous Power Dissipation (TA= +70°C)

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

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

MAX7375

3-Pin Silicon Oscillator

_______________________________________________________________________________________ 3

DUTY CYCLE vs. TEMPERATURE

MAX7375 toc01

TEMPERATURE (°C)

DUTY CYCLE (%)

1109565 80-10 520 35 50-25

-40 125

DUTY CYCLE vs. SUPPLY VOLTAGE

MAX7375 toc02

SUPPLY VOLTAGE (V)

DUTY CYCLE (%)

4.84.13.4

2.7 5.5

SUPPLY CURRENT vs. TEMPERATURE

MAX7375 toc03

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1109565 80-10 5 20 35 50-25

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

-40 125

V+ = 3.3V

V+ = 5V

V+ = 2.7V

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX7375 toc04

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

4.84.13.4

2.0

2.5

3.0

3.5

4.0

1.0

1.5

2.7 5.5

FREQUENCY vs. SUPPLY VOLTAGE

MAX7375 toc05

SUPPLY VOLTAGE (V)

NORMALIZED FREQUENCY

4.84.13.4

0.994

0.996

0.998

1.000

1.002

0.990

0.992

2.7 5.5

0.980

0.990

0.985

1.000

0.995

1.015

1.010

1.005

1.020

-40 10-15 35 60 85 110 135

FREQUENCY vs. TEMPERATURE

MAX7375 toc06

TEMPERATURE (°C)

NORMALIZED FREQUENCY

SETTLING TIME FROM START

MAX7375 toc08

1µs/div

V+

2V/div

CLOCK

2V/div

V+ = 3.3V

CLOCK OUTPUT WAVEFORM

WITH CL = 10pF

MAX7375 toc09

40ns/div

CLOCK

1V/div

V+ = 3.3V

Typical Operating Characteristics

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

SUPPLY CURRENT vs. FREQUENCY

MAX7375 toc07

FREQUENCY (MHz)

SUPPLY CURRENT (mA)

6.54.52.5

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0.5 8.5

V+ = 5.5V

V+ = 5V

V+ = 3.3V

V+ = 2.7V

MAX7375

Detailed Description

The MAX7375 is a replacement for ceramic resonators,

crystals, and crystal oscillator modules as the clock

source for microcontrollers and UARTs in 3V, 3.3V, and

5V applications. The MAX7375 is an integrated oscilla-

tor, supplied at specific frequencies just like crystals

and resonators. A variety of popular standard frequen-

cies are available. No external components are

required for setting or adjusting the frequency.

Supply Voltages

The MAX7375 has been designed for use in systems

with nominal supply voltages of 3V, 3.3V, or 5V and is

specified for operation with supply voltages in the 2.7V

to 5.5V range. Operation outside this range is not guar-

anteed. See the Absolute Maximum Ratings table for

limit values of power-supply and pin voltages.

Oscillator

The clock output is a push-pull configuration and is

capable of driving a ground-connected 1kΩload or a

positive supply connected 500Ωload to within 300mV

of either supply rail. The clock output remains stable

over the full operating voltage range and does not gen-

erate short output cycles during either power on or

power off. A typical startup characteristic is shown in

the Typical Operating Characteristics section.

Output Jitter

The MAX7375’s jitter performance is given in the

Electrical Characteristics table as a peak-to-peak value

obtained by observing the output of the MAX7375 for

20s with a 500MHz oscilloscope. Jitter measurements

are approximately proportional to the period of the out-

put frequency of the device. Thus, a 4MHz part has

approximately twice the jitter value of an 8MHz part.

The jitter performance of all clock sources degrades in

the presence of mechanical and electrical interference.

The MAX7375 is relatively immune to vibration, shock,

and EMI influences and thus provides a considerably

more robust clock source than crystal- or ceramic-res-

onator-based oscillator circuits.

3-Pin Silicon Oscillator

4 _______________________________________________________________________________________

SC70 NAME FUNCTION

1 V+ Positive Supply Voltage

2 CLOCK Clock output. Output is push-pull.

3 GND Ground

Pin Description

Typical Operating Characteristics (continued)

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

CLOCK OUTPUT WAVEFORM

WITH CL = 50pF

MAX7375 toc10

40ns/div

CLOCK

1V/div

V+ = 3.3V

CLOCK OUTPUT WAVEFORM

WITH CL = 100pF

MAX7375 toc11

40ns/div

CLOCK

1V/div

V+ = 3.3V

Applications Information

Interfacing to a Microcontroller Clock

Input

The MAX7375 clock output is a push-pull, CMOS, logic

output, which directly drives any microprocessor (µP)

or microcontroller (µC) clock input. There are no imped-

ance-matching issues when using the MAX7375.

Operate the MAX7375 and microcontroller (or other

clock input device) from the same supply voltage level.

Refer to the microcontroller data sheet for clock input

compatibility with external clock signals.

The MAX7375 requires no biasing components or load

capacitance. When using the MAX7375 to retrofit a

crystal oscillator, remove all biasing components from

the oscillator input.

Startup Performance

The MAX7375 oscillator output stabilizes within a few

cycles of operation after V+ rises to a sufficient voltage

to start the oscillator, typically 1.65V at +25°C. Use a

reset or similar voltage-detection circuit to disable

devices connected to the MAX7375 until 5µs after the

voltage on V+ has risen above 2.7V.

Extended Temperature Operation

The MAX7375 was tested to +135°C during product

characterization and shown to function normally at this

temperature (see Typical Operating Characteristics).

However production test and qualification is only per-

formed from -40°C to +125°C at this time. Contact the

factory if operation outside this range is required.

Power-Supply Considerations

The MAX7375 operates with power-supply voltages in

the 2.7V to 5.5V range. Good power-supply decoupling

is needed to maintain the power-supply rejection per-

formance of the MAX7375. Use a 0.1µF surface-mount

ceramic capacitor connected between V+ and GND

and mounted as close to the device as possible. If pos-

sible, mount the MAX7375 close to the microcontroller’s

decoupling capacitor so that additional decoupling is

not required.

A larger value of bypass capacitor is recommended if

the MAX7375 is to operate with a large capacitive load.

Use a bypass capacitor value of at least 1000 times

that of the output load capacitance.

MAX7375

3-Pin Silicon Oscillator

_______________________________________________________________________________________ 5

PART FREQUENCY (MHz) TOP MARK

MAX7375AXR105 1.00 AOV

MAX7375AXR185 1.84 AOU

MAX7375AXR365 3.58 AOT

MAX7375AXR375 3.69 AOS

MAX7375AXR405 4.00 AOR

MAX7375AXR425 4.19 AOQ

MAX7375AXR805 8.00 AOP

Selector Guide

CLOCK

3 GND

V+

MAX7375AXR

SC70

TOP VIEW

Pin Configuration

Chip Information

TRANSISTOR COUNT: 432

PROCESS: BiCMOS

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,

go to www.maxim-ic.com/packages.)

MAX7375

3-Pin Silicon Oscillator

6 _______________________________________________________________________________________

SC70, 3L.EPS

PACKAGE OUTLINE, 3L SC70

21-0075

MAX7375

3-Pin Silicon Oscillator

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7

Revision History

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 10/03 Initial release —

1—— —

2—— —

3 12/07 Removed all references to MAX7375AUR_ and SOT23 package. 1, 2, 4, 5