FT7521 − Reset Timer with Fixed Delay and Reset Pulse

The FT7521 is a timer for resetting a mobile device where long reset times are needed. The long delay helps avoid unintended resets caused by accidental key presses. It has a fixed delay of 7.5 ±20% seconds. The DSR pin enables Test Mode operation by immediately forcing /RST1 LOW for factory testing.

The FT7521 has one input for single-button resetting capability. The device has a single open-drain output with 0.5 mA pull-down drive.

FT7521 draws minimal I_CC current when inactive and functions over a power supply range of 2.0 V to 5.0 V.

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Product Status/Pricing/Packaging

Index	Product	Product & Eco Status	*Pricing	Packaging & Packing Info	**Package Marking Convention	Qualification Support	Compliance Certificates
0	FT7521L6X	Full Production Green as of Oct 2010	$0.19	MicroPak 6L Details MicroPak 6L Drawing  TAPE REEL	Line 1:PE	FIT :  2.66   ESD (CDM) :  2000  V ESD (HBM) :  4000  V Show more... RTHETA (JA) :  350  °C/W Moisture Sensitivity Level (MSL) :  1   Max Reflow Temp :  260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG
0	FT7521FHX	Full Production Green as of Oct 2012	$0.19	MicroPak2 6L Details MicroPak2 6L Drawing  TAPE REEL	Line 1:PE&K Line 2:&2 (2-Digit Date Code) &Z (Plant Code)	FIT :  2.66   ESD (CDM) :  2000  V ESD (HBM) :  4000  V Show more... RTHETA (JA) :  350  °C/W Moisture Sensitivity Level (MSL) :  1   Max Reflow Temp :  260	RoHS IPC1752 RoHS/REACH/JIG RoHS/REACH/JIG

• Fairchild 1,000 piece Budgetary Pricing. *
• If there is no sample button displayed at the top of the page, please contact one of the Fairchild distributors or your local sales office to obtain samples.
• Top mark packaging information for product FT7521 is available. **

Features

• Fixed Reset Delay: 7.5 Seconds
• One Input Reset Pin
• Open-Drain Output Pin with Fixed 400ms Pulse
• 2.0 V to 5.0 V Operation
• 1 µA I_CCQ Consumption
• 0-Second Test-Mode Enable
• Integrated Pull-Up Resistor on /SRO

Applications

Server & Mainframe Workstation Desktop PC Notebook PC PC Server Media Tablets Storage & Peripherals Printer Graphic Card LCD Monitor CRT/RPTV

Other Data Processing Routers & LAN Switches SAN Long-haul & Metro Broadband Access Broadband Modem Enterprise Voice Network Central Office Broadcast & Studio Other Wired Communications Mobile Handsets

Wireless LAN Card & Broadband Access Wireless LAN Access Point/Router Mobile Comm Infrastructure Other Wireless Communications PMP/MP3 Players Home Audio System Components CRT/RPTV LCD TV PDP TV Camcorder DVD

Set Top Boxes DSC Video Game Console E-book Reader Consumer Appliances Other Audio & Video Other Consumer Electronics Medical Electronics/Devices Automation Test and Measurement Building & Home Control

Other Industrial

Application Notes