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-

reset signal. As the amplitude of the transient increases,

the maximum allowable pulse width decreases.

Ensuring a Valid Reset Output Down to

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

MXD1815 applications where RESET must be valid

RESET and GND removes stray leakage currents, hold-

ing RESET low (Figure 8). The pulldown resistor value is

not critical; 100k

Ω is large enough not to load RESET

and small enough to pull RESET low. For MXD1812/

Low-Power µP Reset Circuits in 3-Pin

SC70/SOT23

6

_______________________________________________________________________________________

RESET

GENERATOR

RESET

OR

RESET

MXD1810

MXD1812

MXD1815

MXD1817

Figure 1. Functional Diagram, Push-Pull Output

RESET

GENERATOR

RESET

MXD1811

MXD1816

Figure 2. Functional Diagram, Open-Drain Active-Low Output

MR

MONITOR

RESET

MXD1813

MXD1818

RESET

GENERATOR

Figure 3. Functional Diagram, Open-Drain Active-Low Output

with Manual Reset Detection

Functional Diagram