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UM822JCE Datasheet(PDF) 9 Page - Union Semiconductor, Inc.

Part # UM822JCE
Description  Reset Circuits with Long Manual Reset Setup Period
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Manufacturer  UNIONSEMI [Union Semiconductor, Inc.]
Direct Link  http://www.union-ic.com
Logo UNIONSEMI - Union Semiconductor, Inc.

UM822JCE Datasheet(HTML) 9 Page - Union Semiconductor, Inc.

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________________________________________________________________________
http://www.union-ic.com Rev.01 Jan.2015
9/17
UM807/821/822
assert reset to prevent code execution errors during power-up, power-down, or brownout conditions.
RESET
_____________
is guaranteed to be a logic low for VCC > 1V. Once VCC exceeds the reset threshold, an
internal timer keeps RESET
_____________
low for the reset timeout period; after this interval, RESET
_____________
goes
high.
If a brownout condition occurs (VCC dips below the reset threshold), RESET
_____________
goes low. Any time
VCC goes below the reset threshold, the internal timer resets to zero, and RESET
_____________
goes low. The
internal timer starts after VCC returns above the reset threshold, and RESET
_____________
remains low for the
reset timeout period.
The manual reset input (MR
_______
) can also initiate a reset. See the Manual Reset Input section.
The UM822 has an active-high RESET output that is the inverse of the UM807/821’s RESET
_____________
output. The UM807 uses an open-drain output, and the UM821/822 have a push-pull output stage.
Connect a pull-up resistor on the UM807’s RESET
_____________
output to any supply between 0 and 6V.
Manual Reset Input
Each device in the UM807/821/822 family includes one manual reset input, which must be held
logic-low for an extended setup period (tMR) before the RESET
_____________
output asserts. When valid manual
reset input conditions/setup periods are met, the RESET
_____________
output is one-shot pulse asserted low for a
fixed reset pulse width (140ms min). Existing front-panel pushbutton switches (i.e., power on/off,
channel up/down, or mode select) can be used to drive the manual reset inputs. The extended manual
reset setup period prevents nuisance system resets during normal front-panel usage or resulting from
inadvertent short-term pushbutton closure.
This input has an internal 20kΩ pull-up resistor, so it can be left open if it is not used. MR
_______
can be
driven with TTL or CMOS-logic levels, or with open-drain/collector outputs. Connect a normally
open momentary switch from MR
_______
to GND to create a manual-reset function; external debounce
circuitry is not required. If MR
_______
is driven from long cables or if the device is used in a noisy
environment, connecting a 0.1μF capacitor from MR
_______
to ground provides additional noise
immunity.
Reset Threshold Accuracy
The UM807/821/822 are ideal for systems using a 5V±5% or 3V±5% power supply with ICs
specified for 5V±10% or 3V±10%, respectively. They are designed to meet worst-case
specifications over temperature. The reset is guaranteed to assert after the power supply falls out of
regulation, but before power drops below the minimum specified operating voltage range for the
system ICs. The thresholds are pre-trimmed and exhibit tight distribution, reducing the range over
which an undesirable reset may occur.


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