MIC826
Voltage Supervisor with Watchdog Timer,
Manual Reset, and Dual Outputs
In 1.6mm x 1.6mm TDFN
General Description Features
The MIC826 is a low-current, ultra-small, voltage Precision 1.8V to 5V power supply monitor
supervisor with manual reset input, watchdog timer, and
0.5% threshold accuracy at T = +25C
A
active-high and active-low push-pull outputs. The reset
1.5% threshold accuracy from T = 40C to +125C
A
outputs are asserted and held when the supply voltage
3.8A supply current (MIC826S/R/T/W/Y/Z)
falls below the factory-programmed threshold voltage,
when the /MR pin is pulled low, or if the watchdog times 4.8A supply current (MIC826L/M)
out. Reset is asserted for the reset timeout delay after the
Manual reset input
supply voltage increases above the rising threshold
140ms (min.) reset timeout period
voltage or when manual reset input is asserted high.
1.6s (typ.) watchdog timeout period
The MIC826 features an integrated pull-up resistor on the
Float watchdog timer input to disable watchdog timer
/MR. An active-low push-pull reset output (/RESET) and
Active-high and active-low push-pull outputs
an active-high reset output (RESET) provide flexibility
when interfacing with various microcontrollers, PMICs, or
Guaranteed reset output valid to VCC = 1V
load switches. The watchdog input can be left
40C to +125C junction temperature range
unconnected for applications that do not require watchdog
6-pin 1.6mm x 1.6mm x 0.5mm Thin DFN package
monitoring.
50% smaller version of
The MIC826 consumes a quiescent current of only 3.8A
MAX823/MAX824/MAX825/ADM823/ADM824/ADM825
and is offered in a tiny, space-saving, 6-pin 1.6mm x
8x lower watchdog input current than competition
1.6mm Thin DFN package. It is rated for the 40C to
+125C temperature range.
Datasheets and support documentation are available on
Applications
Micrels web site at: www.micrel.com.
Microprocessor systems
Computers
Intelligent instruments
_________________________________________________________________________________________________________________________
Typical Application
Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC826
Ordering Information
V : Nominal
RST
Top Junction Temperature Lead
Part Number Threshold Package
Marking Range Finish
Voltage (V)
MIC826LYMT 82L 4.625 Pb-Free
6-Pin 1.6mm 1.6mm TDFN 40C to +125C
MIC826MYMT 82M 4.375 6-Pin 1.6mm 1.6mm TDFN 40C to +125C Pb-Free
MIC826TYMT 82T 3.075 Pb-Free
6-Pin 1.6mm 1.6mm TDFN 40C to +125C
MIC826SYMT 82S 2.925 6-Pin 1.6mm 1.6mm TDFN 40C to +125C Pb-Free
MIC826RYMT 2.625 Pb-Free
82R 6-Pin 1.6mm 1.6mm TDFN 40C to +125C
MIC826ZYMT 82Z 2.315 6-Pin 1.6mm 1.6mm TDFN 40C to +125C Pb-Free
MIC826YYMT 2.188 Pb-Free
82Y 6-Pin 1.6mm 1.6mm TDFN 40C to +125C
MIC826WYMT 82W 1.665 6-Pin 1.6mm 1.6mm TDFN 40C to +125C Pb-Free
Pin Configuration
6-Pin 1.6mm 1.6mm TDFN
(Top View)
Pin Description
Pin
Pin Name Pin Function
Number
Active-Low Reset Output. Pulses low for 200ms when triggered, and remains low whenever VCC is below
1 /RESET
the reset threshold or when /MR is a logic low. It remains low for 200ms after one of the following occurs:
VCC rises above the reset threshold, the watchdog triggers a reset, or /MR goes low to high.
2 GND Supply Ground.
Active-High Reset Output. Pulses high for 200ms when triggered, and remains high whenever VCC is
below the reset threshold or when /MR is a logic low. It remains high for 200ms after one of the following
3 RESET
occurs: VCC rises above the reset threshold, the watchdog triggers a reset, or /MR goes low to high.
RESET is the inverse of /RESET.
Watchdog Input. If WDI remains either high or low for longer than the watchdog timeout period, the internal
watchdog timer runs out and a reset is triggered. The internal watchdog timer clears whenever reset is
4 WDI
asserted, or whenever WDI sees a rising or falling edge. If WDI is left unconnected or is connected to a
three-stated buffer output, the watchdog feature is disabled.
Manual Reset Input. A logic low on /MR asserts reset. Reset remains asserted as long as /MR is held low
and for 200ms after /MR returns high. The active-low input has an internal 52k pull-up resistor. It can be
5 /MR
driven from a CMOS logic line or shorted to ground with a switch. Leave open or connect to VCC if
unused.
Supply Voltage Pin. VCC is the input to the supply voltage monitor. When the supply voltage falls below
the reset threshold voltage, reset outputs (/RESET and RESET) are triggered immediately. When the
6 VCC supply voltage rises above the reset threshold plus hysteresis voltage, the reset outputs remain asserted
for the duration of the reset timeout period. A decoupling ceramic capacitor (minimum 0.1F) must be
connected between VCC and GND close to the pins.
EP ePad Exposed Pad. Connect to GND.
Revision 1.0
February 4, 2013 2