MAXIM MAX7384 User Manual

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General Description

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 highspeed 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 MAX7384 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 MAX7384 is a good choice for demanding home appliance, industrial, and automotive environments.

The MAX7384 is available with factory-programmed frequencies ranging from 10MHz to 16MHz. See Table 1 for standard frequencies and contact the factory for custom frequencies. Refer to the MAX7378 data sheet for frequencies less than 10MHz.

The MAX7384 is available in an 8-pin µMAX®package. The MAX7384 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 ♦ High-Speed Oscillator from 10MHz to 16MHz

Low-Speed 32kHz Oscillator Glitch-Free Clock-Speed Switching

♦ 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 ♦ 13µA, 32kHz Operating Current ♦ -40°C to +125°C Temperature Range

MAX7384

Silicon Oscillator with Low-Power Frequency

Switching and 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

MAX7384

0.1µF

I/O PORT

SPEED

Typical Application Circuit

19-3493; Rev 0; 11/04

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.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

PART* TEMP RANGE

MAX7384A_ _ _ -40°C to +125°C8 µMAX

MAX7384B_ _ _ -40°C to +125°C8 µMAX

MAX7384C_ _ _ -40°C to +125°C8 µMAX Open drain

PINPACKAGE

RESET

OUTPUT

Active high

push-pull

Active low

push-pull

MAX7384

Silicon Oscillator with Low-Power Frequency Switching and 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

Input Current (SPEED)......................................................±50mA

Continuous Power Dissipation (T

= +70°C)

8-Pin µMAX (derate 4.5mW/°C above +70°C) ...362mW (U8-1)

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

LOGIC INPUTS (SPEED)

Input High Voltage V Input Low Voltage V Input Current I

CLOCK OUTPUT

Output High Voltage V

Output Low Voltage V

Initial Fast Clock Frequency Accuracy

Fast Clock Temperature Coefficient

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

= 16MHz, TA = -40°C to +125°C, no

CLOCK

load f

= 14.7456MHz, TA = -40°C to

CLOCK

+125°C, no load f

= 12MHz, TA = -40°C to +125°C, no

CLOCK

load f

= 11.0592MHz, TA = -40°C to

CLOCK

+125°C, no load f

= 10MHz, TA = -40°C to +125°C, no

CLOCK

load f

= 32.768kHz, TA = -40°C to

CLOCK

+125°C, no load

IH IL

= SPEED = 5.5V 2

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

= -40°C to +125°C ±50 ±350 ppm/°C

SOURCE SOURCE SINK SINK

2.7 5.5 V

8.7

8.0

6.5

6.0

5.4

13 25 µA

0.7 x V

0.3 x V

= 7.0mA

= 2.0mA = 20mA = 10mA

- 0.4 V

0.4 V

-2.5 +2.5

-5 +3.5

µA

MAX7384

Silicon Oscillator with Low-Power Frequency

Switching and 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.

Slow Clock Frequency f

Slow Clock Temperature Coefficient

Duty Cycle (Note 2) 40 50 60 %

Output Jitter

Output Rise Time t Output Fall Time t

Power-On-Reset Threshold V

Power-On-Reset Hysteresis V

Power-On-Reset Delay PORdly VCC rising from 0 to 5V in 1µs at +25°C 122 µs

RESET OUTPUT

Output High Voltage (Note 3)

Output Low Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CLOCK

R F

HYST

VCC = 5V, TA = +25°C 32.268 32.768 33.268 VCC = 2.7V to 5.5V, TA = +25°C 31.768 32.768 33.768

= -40°C to +125°C ±50 ±325 ppm/°C

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

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 T

= -40°C to

+125°C

= 7.0mA

= 2.0mA

= 10mA 0.4

-5 +5

0.4

80 ps

kHz

P-P

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