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Data Sheet

FULL DATA SHEET (PDF, 280kB) Download   E-Mail

Description

The MAX7391 replaces ceramic resonators, crystals, and supervisory functions for microcontrollers in 3.3V and 5V applications. The MAX7391 provides a clock source, reset, and power-fail functions. The programmable power-fail function provides early warning of power failure and is configurable to detect either an external voltage or the VCC supply to the device. The clock output can be switched between normal and half-speed operation. This functionality allows the microcontroller to operate at reduced power and may be used to extend the time available to perform housekeeping tasks, such as writing data to flash during a power failure. Connecting the power-fail output to the SPEED input reduces clock speed automatically during power-fail events. The MAX7391 clock output is factory programmed to a frequency in the 1MHz to 16MHz range. Four standard frequencies are available. Other frequencies are available upon request. The maximum operating supply current is 5.5mA (typ) with a clock frequency of 12MHz. Unlike typical crystal and ceramic resonator oscillator circuits, the MAX7391 is resistant to EMI and vibration, and operates reliably at high temperatures. The high-output drive current and absence of high-impedance nodes make the oscillator invulnerable to dirty or humid operating conditions. The MAX7391 is available in an 8-pin µMAX® package. The MAX7391 standard operating temperature range is from -40°C to +125°C.

Key Features		Applications/Uses
Robust Microcontroller Clock and Supervisory Functions in a Single Package Integrated Reset and Power-Fail Functions 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 Accurac for 0°C to +85°C 5.5mA Operating Current (12MHz Version) -40°C to +125°C Temperature Range Surface-Mount Package 1MHz to 16MHz Factory Preset Frequency Range		Appliances and Controls Automotive Handheld Products Microcontroller Systems Portable Equipment White Goods

Diagram

Typical Operating Circuit

Application Notes

Application Note 3582: Replacing Crystals and Ceramic Resonators with Silicon Oscillators - MAX7391

Evaluation Kits

none

Design Guides

Microprocessor Supervisory (PDF) System Timing & Control (PDF)

Reliability Reports

Show FIT data for: MAX7391 Request Reliability Report for: MAX7391

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-16 of 16
MAX7391	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX7391CMAC				-40°C to +125°C	See data sheet
MAX7391CSAC				-40°C to +125°C	See data sheet
MAX7391CMVB			uMAX;8 pin; Dwg: 21-0036 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX7391CMTP			uMAX;8 pin; Dwg: 21-0036 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX7391CMRD			uMAX;8 pin; Dwg: 21-0036 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX7391CMVB-T				-40°C to +125°C	See data sheet
MAX7391CMTP-T			uMAX;8 pin; Dwg: 21-0036 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX7391CMRD-T				-40°C to +125°C	See data sheet
MAX7391CMWB-T				-40°C to +125°C	See data sheet
MAX7391CSWB-T				-40°C to +125°C	See data sheet
MAX7391CSVB-T				-40°C to +125°C	See data sheet
MAX7391CSRD-T				-40°C to +125°C	See data sheet
MAX7391CSWB			uMAX;8 pin; Dwg: 21-0036 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX7391CSVB			uMAX;8 pin; Dwg: 21-0036 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX7391CSRD			uMAX;8 pin; Dwg: 21-0036 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis
MAX7391CMWB			uMAX;8 pin; Dwg: 21-0036 (PDF) Use pkgcode/variation: U8-1*	-40°C to +125°C	RoHS/Lead-Free: No Materials Analysis

Related Products

MAX7387, MAX7388 System Monitoring Oscillator with Watchdog and Power Fail MAX7389, MAX7390 Microcontroller Clock Generator with Watchdog

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