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CAT825YTDI-G Datasheet(PDF) 7 Page - Catalyst Semiconductor

No. de pieza CAT825YTDI-G
Descripción Electrónicos  System Supervisory Voltage Reset with Watchdog and Manual Reset
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Fabricante Electrónico  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT825YTDI-G Datasheet(HTML) 7 Page - Catalyst Semiconductor

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CAT823, CAT824, CAT825
© Catalyst Semiconductor, Inc.
7
Doc. No. MD-3027, Rev. B
Characteristics subject to change without notice
FUNCTIONAL DESCRIPTION
PROCESSOR RESET
The
CAT823-825
detect
supply
voltage
(VCC)
conditions that are below the specified voltage trip
value (VRST) and provide a reset output to maintain
correct system operation. On power-up, RESET
¯¯¯¯¯¯ (and
RESET if available) are kept active for a minimum
delay tRP of 140ms after the supply voltage (VCC) rises
above VRST to allow the power supply and processor
to stabilize. When VCC drops below the voltage trip
value (VRST), the reset output signals RESET
¯¯¯¯¯¯ (and
RESET) are pulled active. RESET
¯¯¯¯¯¯ (and RESET if
available) is specifically designed to provide the reset
input signals for processors. This provides reliable
and consistent operation as power is turned on, off or
during brownout conditions by maintaining the
processor operation in known conditions.
MANUAL RESET
The CAT823 and CAT825 each have a Manual Reset
(MR
¯¯¯) input to allow for alternative control of the reset
outputs. The MR
¯¯¯ input is designed for direct con-
nection to a pushbutton (see Figure 1). The MR
¯¯¯ input
is internally pulled up by 52kΩ resistor and must be
pulled low to cause the reset outputs to go active.
Internally, this input is debounced and timed such that
RESET
¯¯¯¯¯¯ (and RESET) signals of at least 140ms
minimum will be generated. The min 140ms tRP delay
commences as the Manual Reset input is released
from the low level. (see Figure 2)
Figure 1. Pushbutton RESET
Figure 2. Timing Diagram – Pushbutton RESET
VIL
VIH
VOH
tRP
tPDLY
tPB
VOL
RESET
RESET
MR
RESET
CAT825
VCC
RESET
GND
MR
Supply
Voltage


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