MAX6420_12 datasheet(8/12 Pages) MAXIM

Part #	MAX6420

Description	Low-Power, Single/Dual-Voltage μP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay

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Manufacturer	MAXIM [Maxim Integrated Products]

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Interfacing to Other Voltages for Logic

Compatibility

The open-drain outputs of the MAX6414/MAX6417/

MAX6420 can be used to interface to µPs with other

logic levels. As shown in Figure 5, the open-drain out-

put can be connected to voltages from 0 to 5.5V. This

allows for easy logic compatibility to various micro-

processors.

Negative-Going VCC Transients

In addition to issuing a reset to the µP during power-up,

power-down, and brownout conditions, these supervisors

are relatively immune to short-duration negative-going

transients (glitches). The Maximum Transient Duration vs.

Reset Threshold Overdrive graph in the

Typical

Operating Characteristics shows this relationship.

The area below the curve of the graph is the region in

which these devices typically do not generate a reset

pulse. This graph was generated using a negative-

going pulse applied to VCC, starting above the actual

reset threshold (VTH) and ending below it by the magni-

tude indicated (reset-threshold overdrive). As the mag-

nitude of the transient decreases (farther below the

reset threshold), the maximum allowable pulse width

decreases. Typically, a VCC transient that goes 100mV

below the reset threshold and lasts 50µs or less will not

cause a reset pulse to be issued.

Ensuring a Valid RESET or

RESET

Down to VCC = 0V

When VCC falls below 1V, RESET/RESET current sink-

ing (sourcing) capabilities decline drastically. In the

case of the MAX6412, MAX6415, and MAX6418, high-

impedance CMOS-logic inputs connected to RESET

can drift to undetermined voltages. This presents no

problems in most applications, since most µPs and

other circuitry do not operate with VCC below 1V.

In those applications where RESET must be valid down

to 0, adding a pulldown resistor between RESET and

ground sinks any stray leakage currents, holding

RESET low (Figure 6). The value of the pulldown resis-

tor is not critical; 100k

Ω is large enough not to load

RESET and small enough to pull RESET to ground. For

applications using the MAX6413, MAX6416, and

MAX6419, a 100k

Ω pullup resistor between RESET and

VCC will hold RESET high when VCC falls below 1V

(Figure 7). Open-drain RESET versions are not recom-

mended for applications requiring valid logic for VCC

down to 0V.

Low-Power, Single/Dual-Voltage µP Reset Circuits

with Capacitor-Adjustable Reset Timeout Delay

MAX6412–MAX6420

8

Maxim Integrated

MAX6414

MAX6417

MAX6420

VCC

GND

3.3V

5.0V

RESET

10k

Ω

5V SYSTEM

Figure 5. MAX6414/MAX6417/MAX6420 Open-Drain RESET

Output Allows use with Multiple Supplies

MAX6412

MAX6415

MAX6418

GND

VCC

RESET

100k

Ω

Figure 6. Ensuring RESET Valid to VCC = 0V

MAX6413

MAX6416

MAX6419

GND

VCC

RESET

100k

Ω

Figure 7. Ensuring RESET Valid to VCC = 0V

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