MIC2785 Datasheet PDF - MICREL

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MIC2785
MICREL

Part Number MIC2785
Description Dual Supply Voltage Monitor
Page 6 Pages


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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 (VIN) separate
from the supply input (VDD). 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
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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 +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2009
M9999-031709-A



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Micrel, Inc.
Ordering Information(1)
Part Number
Typical Application
Voltage
Nominal Threshold
Voltage
MIC2785-16YFT
1.8V +10%
1.62V
Note:
1. Other voltage thresholds available. Contact Micrel for details.
MIC2785
Package
6-Pin (1.2mm x 1.2mm) Thin MLF®
Pin Configuration
6-Pin (1.2mm x 1.2mm) Thin MLF® (FL)
Pin Description
Pin Number
1
2
3
4
5
6
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Pin Name
NC
VDD
GND
VIN
/MR
/RST
Pin Function
Not Internally Connected.
Analog (Input): Independent supply input for internal circuitry.
Ground.
Analog (Input). Monitored input voltage. An under-voltage condition will trigger a reset
sequence.
Digital (Input): Asserting this pin low initiates an immediate and unconditional reset.
Assuming VIN is above the threshold when /MR is released (returns high), the reset
output will be de-asserted. /MR may be driven by a logic signal or a mechanical switch.
/MR has an internal pull-up to VDD and may be left floating if unused.
Digital (Output): Asserted low whenever the VIN pin voltage falls below the reference
voltage or Manual Reset pin (/MR) is asserted. It will remain asserted until VIN voltage
rises above the threshold voltage and the /MR pin is released. The maximum output
voltage of the /RST pin is VIN. /RST is a push-pull output.
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Micrel, Inc.
MIC2785
Absolute Maximum Ratings(1)
Supply Voltage (VDD)........................................-0.3V to +6V
Monitor Input (VIN) ............................................-0.3V to +6V
Input Voltage (V/MR) ..........................................-0.3V to +6V
/RST Current .............................................................±20mA
Lead Temperature (soldering, 20sec.)....................... 260°C
Junction Temperature (TJ) .........................-40°C to +125°C
Storage Temperature (Ts) ..........................-65°C to +150°C
ESD Rating(3) (Human Body Model) ............................. ±1.5kV
Operating Ratings(2)
Supply Voltage (VDD).................................... +1.5V to +5.5V
Monitor Input (VIN) ......................................... –0.3V to + VDD
Input Voltage (V/MR) ..................................... –0.3V to + 5.5V
Ambient Temperature (TA) .......................... –40°C to +85°C
Junction Thermal Resistance
MLF® (θJA).....................................................140.7°C/W
Electrical Characteristics(4)
VDD = 3.1V; VIN = VDD = 3.1V TA = 25°C, bold values indicate –40°C< TA < +85°C, unless noted.
Symbol Parameter
Condition
Min
IDD Supply Current (VDD)
VIN = VTH +1.6%, /MR & /RST open
IIN Supply Current (VIN)
VIN = VTH +1.6%, /MR & /RST open
VTH Accuracy
-1.5
VHYST
Hysteresis Voltage
tPROP_TH
VOL
Propagation Delay
Output Voltage Low
VIN = VTH ±1 .5%, ±100mV
VIN ≤ VTH -1.5%, ISINK = 100µA, VDD > 1.2V
VOH Output Voltage High
VIN > VTH +1.5%, ISOURCE = 500µA
0.8 * VIN
/MR Input
VIH Input High Voltage
VDD = 3.1V
1.7
VIL Input Low Voltage
VDD = 3.1V
tPROP_MR Propagation Delay
V/MR < (VIL –100mV)
tMIN
Minimum Input Pulse Width
V/MR < VIL reset occurs
IPU Internal Pull-up Current
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Specification for packaged product only.
Typ
1.0
3.5
1.5
5
0.5
33
100
Max
+1.5
25
0.3
0.4
25
Units
µA
µA
%
%
µs
V
V
V
V
µs
ns
nA
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March 2009
3 M9999-031709-A



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Micrel, Inc.
Timing Diagram
MIC2785
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March 2009
4 M9999-031709-A



MIC2785 datasheet pdf
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