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MAX810SEUR Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # MAX810SEUR
Description  MAX803/MAX809/MAX810 3-Pin Microprocessor Reset Circuits
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX810SEUR Datasheet(HTML) 6 Page - Maxim Integrated Products

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MAX803/MAX809/MAX810
3-Pin Microprocessor Reset Circuits
6
Maxim Integrated
Therefore, high-impedance CMOS logic inputs con-
nected to RESET can drift to undetermined voltages.
This presents no problem in most applications since
most µP and other circuitry is inoperative with VCC
below 1V. However, in applications where RESET must
be valid down to 0V, adding a pull-down resistor to
RESET causes any stray leakage currents to flow to
ground, holding RESET low (Figure 2). R1’s value is not
critical; 100k
Ω is large enough not to load RESET and
small enough to pull RESET to ground.
A 100k
Ω pullup resistor to VCC is also recommended
for the MAX810 if RESET is required to remain valid for
VCC < 1V.
Interfacing to µPs with
Bidirectional Reset Pins
Since the RESET output on the MAX803 is open drain,
this device interfaces easily with µPs that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESET output directly
to the microcontroller’s (µC’s) RESET pin with a single
pullup resistor allows either device to assert reset
(Figure 3).
MAX803 Open-Drain
RESET Output
Allows Use with Multiple Supplies
Generally, the pullup connected to the MAX803 will
connect to the supply voltage that is being monitored at
the IC’s VCC pin. However, some systems may use the
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
(Figure 4). Note that as the MAX803’s VCC decreases
RESET
GND
RESET
INPUT
RPULLUP
MAX803
5V SYSTEM
GND
VCC
+3.3V
+5.0V
VCC
Figure 4. MAX803 Open-Drain RESET Output Allows Use with
Multiple Supplies
RESET
GND
RESET
INPUT
MAX803
MOTOROLA
68HCXX
µP
GND
VCC
VCC
VCC
Figure 3. Interfacing to µPs with Bidirectional Reset I/O
400
320
0
1
100
1000
160
80
240
RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)
10
TA = +25°C
MAX8_ _J/L/M
MAX8_ _R/S/T/Z
Figure 1. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
R1
100k
VCC
GND
MAX809
RESET
Figure 2. RESET Valid to VCC = Ground Circuit


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