Reset IC- ZCC3808替代TPS3808

FUNCTIONAL DESCRIPTION
The family of microprocessor supervisory
circuits monitors system voltages from 0.4 V to
5V, asserting an open-drain 𝐑𝐄𝐒𝐄𝐓 signal when
the SENSE voltage drops below a preset threshold
or when the manual reset (𝐌𝐑) pin drops to a
logic low. The 𝐑𝐄𝐒𝐄𝐓 output remains low for
the user-adjustable delay time after the SENSE
voltage and manual reset (𝐌𝐑) return above the
respective thresholds.
The device uses a precision reference to
achieve 0.5% threshold accuracy for VIT ≤ 3.3 V.
The reset delay time can be set to 20 ms by
disconnecting the CT pin, 300 ms by connecting
the CT pin to VDD using a resistor, or can be user
adjusted between 1.25 ms and 10 s by connecting
the CT pin to an external capacitor. The
device has a very low typical quiescent current of
1.7 μA, so it is well-suited to battery-powered
applications. It is available in the SOT-23 and 2-
mm × 2-mm WSON packages, and is fully specified
over a temperature range of –
40°C to 125°C (TJ).
MAIN FEATURES
•
Power-On Reset Generator with Adjustable
Delay Time: 1.25 ms to 10 s
•
Very Low Quiescent Current: 1.7 μA Typical
•
High Threshold Accuracy: 0.5% Typ
•
Fixed Threshold Voltages for Standard
Voltage Rails from 0.9 V to 5 V and
Adjustable Voltage Down to 0.4 V Are
Available
•
Manual Reset (𝐌𝐑) Input
•
Open-Drain 𝐑𝐄𝐒𝐄𝐓 Output
•
Temperature Range: –40°C to 125°C
•
Small SOT-23 and 2-mm × 2-mm WSON
Packages
APPLICATIONS
•
DSP or Microcontroller Applications
•
Notebook and Desktop Computers
•
PDAs and Hand-Held Products
•
Portable and Battery-Powered Products
•
FPGA and ASIC Applications