FT7521 Datasheet, PDF (1/9 Pages) Fairchild Semiconductor – Reset Timer with Fixed Delay and Reset Pulse

September 2012
FT7521
Reset Timer with Fixed Delay and Reset Pulse
Features
 Fixed Reset Delay: 7.5 Seconds
 One Input Reset Pin
 Open-Drain Output Pin with Fixed 400ms Pulse
 1.8 V to 5.0 V Operation (T_A=-40°C to +85°C)
 1.7 V to 5.0 V Operation (T_A=-25°C to +85°C)
 1.65 V to 5.00 V Operation (T_A=0°C to +85°C)
 <1 µA I_CCQ Consumption
 Zero-Second Test-Mode Enable
 Integrated Pull-Up Resistor on /SRO
Applications
 Cell Phones
 Portable Media Players
 Tablets
 Mobile Devices
 Consumer Medical
Description
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 1.65 V to 5.0 V.
Figure 1. Block Diagram
Ordering Information
Part Number
FT7521L6X
FT7521FHX
(Preliminary)
Operating
Temperature Range
Package
-40C to +85C
6-Lead, MicroPak™ 1.0 x 1.45 mm, JEDEC MO-252
6-Lead, MicroPak2™ 1.0 x 1.0 mm Body, .35 mm Pitch
Packing
Method
5000 Units on
Tape and Reel
© 2009 Fairchild Semiconductor Corporation
FT7521 • Rev. 1.0.7
www.fairchildsemi.com