MIC2785 Datasheet, PDF (1/6 Pages) Micrel Semiconductor – Dual Supply Voltage Monitor with Manual Reset

MIC2785
Dual Supply Voltage Monitor
with Manual Reset
General Description
Features
The MIC2785 is a micropower voltage monitor that
provides under-voltage monitoring and manual reset
capability in a tiny 1.2mm x 1.2mm MLF^® package. The
MIC2785 provides a monitored voltage input (V_IN) separate
from the supply input (V_DD). This insures that the reset
(/RST) output maintains a valid output state when the
voltage being monitored ramps up or down. The device
also includes a manual reset input (/MR). The /RST output
is an active low push-pull output.
The under-voltage detector compares the VIN pin voltage
against the factory-programmed threshold of 1.62V. The
reset output is asserted any time the input voltage drops
below the programmed threshold voltage. A reset can be
generated at any time by asserting the manual reset input,
/MR. This reset output will remain active until the release
of /MR. The /MR input can also be used to daisy-chain the
MIC2785 onto existing power monitoring circuitry or other
supervisors. Hysteresis is included to prevent chattering
due to noise.
• No external components
• Monitors input voltage for under-voltage condition
• Separate inputs for supply (VDD) and monitor (VIN)
• +1.5% VIN threshold voltage accuracy
• Valid /RST state with VIN down to 0.0V
• Valid /RST state with VDD down to 1.20V
• Factory-programmed 1.62V reference
• Manual reset input (/MR)
• Active low RESET (/RST) output
• Ultra-low input current – 5µA total (VIN and VDD)
• Rejects brief input transients
• -25°C to 85°C operating temperature range
• RoHS lead-free compliant
• Available in tiny 6-pin 1.2mm x 1.2mm Thin MLF^®
package
The MIC2785 consumes a minimum of quiescent current,
only 5µA, 1.5µA from the main supply pin and 3.5µA from
the input pin. Offered in a tiny, space saving 6-pin MLF^®
(1.2mm x 1.2mm), package. (RoHS lead-free compliant).
Applications
• Mobile phones
• PDAs
Datasheets and support documentation can be found on ^{• GPS receivers}
Micrel’s web site at: www.micrel.com.
___________________________________________________________________________________________________________
Typical Application
Memory or Microprocessor Voltage Monitor
MicroLeadFrame and MLF are registered trademark of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 2009
M9999-031709-A