MIC2774_15 Datasheet, PDF (1/11 Pages) Micrel Semiconductor – Dual Micro-Power Low Voltage Supervisor

MIC2774
Dual Micro-Power Low Voltage Supervisor
General Description
The MIC2774 is a dual power supply supervisor that
provides undervoltage monitoring, manual reset capability,
and power-on reset generation in a compact 5-pin SOT-23
package. Features include two undervoltage detectors,
one fixed and one adjustable, and a choice of reset
outputs. One undervoltage detector compares V_DD against
a fixed threshold. Ten factory-programmed thresholds are
available. The second, user-adjustable input is compared
against a 300mV reference. This low reference voltage
allows for the monitoring of voltages lower than those
supported by previous supervisor ICs.
The reset outputs are asserted at power-on and at any
time either voltage drops below the programmed threshold
voltage and remains asserted for 140ms (min.) after they
subsequently rise back above the threshold boundaries.
Manual reset functionality can be provided by a switch
connected between ground and the /MR input. A wide
choice of voltage thresholds provides for a variety of
supply voltages and tolerances. Hysteresis is included to
prevent chattering due to noise. Typical supply current is a
low 3.5µA.
Datasheets and support documentation are available on
Micrel’s website at: www.micrel.com.
Features
• Monitors two independent power supplies for
undervoltage conditions
• One fixed and one user-adjustable input
• Choice of ten factory-programmed thresholds
• Adjustable input can monitor supplies as low as 0.3V
• Generates 140ms (min.) power-on reset pulse
• Manual reset input
• Choice of active-high, active-low, or open-drain active-
low reset outputs
• Inputs may be pulled above V_DD (7V abs. max.)
• /RST output valid down to 1.2V
• Ultra-low supply current, 3.5µA typical
• Rejects brief input transients
• IttyBitty™ 5-pin SOT-23 package
• Pin-compatible upgrade for MAX6306/09/12
Applications
• Monitoring processor ASIC or FPGA core and I/O
voltages
• PDAs, hand-held PCs
• Embedded controllers
• Telecommunications systems
• Power supplies
• Wireless/cellular systems
• Networking hardware
Typical Application
IttyBitty is a trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 16, 2015
Revision 2.0