MAX6419UK46-T datasheet(7/12 Pages) MAXIM

Part #	MAX6419UK46-T

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

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual-Voltage Monitoring

(MAX6418/MAX6419/MAX6420)

The MAX6418/MAX6419/MAX6420 contain both facto-

ry-trimmed threshold voltages and an adjustable reset

threshold input, allowing the monitoring of two voltages,

VCC and VMON_TH (see Figure 4). Reset is asserted

when either of the voltages falls below its respective

threshold voltage.

Application Information

Selecting a Reset Capacitor

The reset timeout period is adjustable to accommodate

a variety of µP applications. Adjust the reset timeout

period (tRP) by connecting a capacitor (CSRT) between

SRT and ground. Calculate the reset timeout capacitor

as follows:

CSRT = (tRP - 275µs) / (2.71 106)

where tRP is in seconds and CSRT is in Farads

The reset delay time is set by a current/capacitor-con-

trolled ramp compared to an internal 0.65V reference.

An internal 240nA ramp current source charges the

external capacitor. The charge to the capacitor is

cleared when a reset condition is detected. Once the

reset condition is removed, the voltage on the capacitor

ramps according to the formula: dV/dt = I/C. The CSRT

capacitor must ramp to 0.65V to deassert the reset.

CSRT must be a low-leakage (<10nA) type capacitor,

ceramic is recommended.

Operating as a Voltage Detector

The MAX6412–MAX6420 can be operated in a voltage

detector mode by leaving SRT unconnected. The reset

delay times for VCC rising above or falling below the

threshold are not significantly different. The reset output

is deasserted smoothly without false pulses.

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

with Capacitor-Adjustable Reset Timeout Delay

MAX6412–MAX6420

Maxim Integrated

7

RESET

CIRCUITRY

LASER-TRIMMED

RESISTORS

VCC

1.26V

RESET IN

GND

R1

R2

SRT

CSRT

(RESET)

RESET

VMON_TH

MAX6418

MAX6419

MAX6420

ONLY

RL

µP

Figure 4. MAX6418/MAX6419/MAX6420 Monitoring Two Voltages

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MAX6419UK46-T Datasheet(PDF) 7 Page - Maxim Integrated Products

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