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MAX7390srff Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX7390srff Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 11 page General Description The MAX7389/MAX7390 replace ceramic resonators, crystals, and supervisory functions for microcontrollers in 3.3V and 5V applications. The MAX7389/MAX7390 provide a clock source, reset, and watchdog functions. The watchdog timer is pin pro- grammable and provides watchdog timeout values in the 16ms to 2048ms range. The MAX7389 provides a separate watchdog output that is used as a status indi- cator or to control safety-critical system elements. The MAX7390 features a clock-speed select that reduces the output frequency by half. This functionality allows the microcontroller to operate at reduced power and may be used to extend the time available to per- form housekeeping tasks, such as writing data to flash during a power failure. The MAX7389/MAX7390 clock outputs are factory pro- grammed to a frequency in the 1MHz to 16MHz range. Four standard frequencies are available. Other frequen- cies are available upon request. The maximum operating supply current is 5.5mA with a clock frequency of 12MHz. Unlike typical crystal and ceramic resonator oscillator circuits, the MAX7389/MAX7390 are resistant to EMI and vibration, and operate reliably at high tempera- tures. The high-output drive current and absence of high-impedance nodes make the oscillator invulnerable to dirty or humid operating conditions. The MAX7389/MAX7390 are available in an 8-pin µMAX® package. The MAX7389/MAX7390 standard operating temperature range is from -40°C to +125°C. Applications White Goods Handheld Products Automotive Portable Equipment Appliances and Controls Microcontroller Systems Features ♦ Robust Microcontroller Clock and Supervisor in a Single Package ♦ Integrated Reset and Watchdog Functions ♦ Pin-Programmable Watchdog Timeout ♦ Speed Select ♦ +2.7V to +5.5V Operation ♦ Factory-Trimmed Oscillator ♦ Reset Valid Down to 1.1V Supply Voltage ♦ ±10mA Clock-Output Drive Current ♦ ±4% Total Accuracy for -40°C to +125°C ♦ ±2.75% Total Accuracy for 0°C to +85°C ♦ 5.5mA Operating Current (12MHz Version) ♦ -40°C to +125°C Temperature Range ♦ 8-Pin µMAX Surface-Mount Package ♦ 1MHz to 16MHz Factory Preset Frequency Microcontroller Clock Generator with Watchdog ________________________________________________________________ Maxim Integrated Products 1 19-3897; Rev 1; 2/06 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. RST/RST TOP VIEW µMAX WDI WDO GND 1 2 8 7 CLOCK WDS1 WDS2 VCC 3 4 6 5 MAX7389 Pin Configurations Ordering Information PART TEMP RANGE PIN- PACKAGE PKG CODE MAX7389srff -40 oC to +125oC 8 µMAX U8-1 MAX7390srff -40 oC to +125oC 8 µMAX U8-1 Note: “s” is a placeholder for the reset output type. Insert the symbol found in Table 3 in the place of “s.” “r” is a placeholder for the power-on reset (POR) voltage. Insert the symbol found in Table 2 in the place of “r.” “ff” is a placeholder for the nominal output frequency. Insert the symbol found in Table 4 in the place of “ff.” For example, MAX7389CMTP describes a device with 4.38V reset level, open-collector RST output, and a clock output frequency of 8MHz. Typical Application Circuit, Functional Diagram, and Selector Guide appear at end of data sheet. µMAX is a registered trademark of Maxim Integrated Products, Inc. WDI SPEED GND 1 2 8 7 CLOCK RST/RST WDS1 WDS2 VCC TOP VIEW 3 4 6 5 MAX7390 µMAX |
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