MXD1810 Maxim, MXD1810 Datasheet - Page 6

• Manufacturer Part Number: MXD1810
• Description: Low-Power UP Reset Circuits in 3-Pin
• Manufacturer: Maxim

Low-Power µP Reset Circuits in 3-Pin
SC70/SOT23
Figure 1. Functional Diagram, Push-Pull Output
Figure 3. Functional Diagram, Open-Drain Active-Low Output
with Manual Reset Detection
6
V
V
CC
CC
_______________________________________________________________________________________
V
REF
V
REF
GENERATOR
MONITOR
GENERATOR
RESET
MXD1810
MXD1812
MXD1815
MXD1817
MXD1813
MXD1818
MR
RESET
RESET
OR
RESET
RESET
The Typical Operating Characteristics show the
Maximum Transient Duration vs. Reset Threshold
Overdrive for which reset pulses are not generated. The
graph shows the maximum pulse width that a negative-
going V
reset signal. As the amplitude of the transient increases,
the maximum allowable pulse width decreases.
When V
push-pull structured reset sinking (or sourcing) capabil-
ities decrease dramatically. High-impedance CMOS-
logic inputs connected to the RESET/RESET pin can
drift to indeterminate voltages. This does not present a
problem in most cases, since most µPs and circuitry do
not operate at V
MXD1815 applications where RESET must be valid
down to V
RESET and GND removes stray leakage currents, hold-
ing RESET low (Figure 8). The pulldown resistor value is
not critical; 100kΩ is large enough not to load RESET
and small enough to pull RESET low. For MXD1812/
Figure 2. Functional Diagram, Open-Drain Active-Low Output
V
CC
Ensuring a Valid Reset Output Down to
CC
CC
CC
transient may typically have without issuing a
falls below the minimum operating voltage,
= 0, adding a pulldown resistor between
V
REF
CC
Functional Diagram
below +1V. For MXD1810/
GENERATOR
MXD1811
MXD1816
RESET
V
CC
RESET
= 0