MAX16005 datasheet(19/26 Pages) MAXIM

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Low-Voltage, Quad-/Hex-/Octal-Voltage

µP Supervisors

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Adjustable Input

These devices offer several monitor options with

adjustable input thresholds (see Table 1). The threshold

voltage at each adjustable IN_ input is typically 0.394V

(TOL = GND) or 0.372 (TOL = VCC). To monitor a voltage

VINTH, connect a resistive-divider network to the circuit as

shown in Figure 10.

VINTH = VTH ((R1 / R2) + 1)

R1 = R2 ((VINTH / VTH) - 1)

Large resistors can be used to minimize current through

the external resistors. For greater accuracy, use lower-

value resistors.

Unused Inputs

Connect any unused IN_ inputs to a voltage above its

threshold.

OUT_ Outputs

(MAX16000/MAX16001/MAX16003/

MAX16004/MAX16006)

The OUT_ outputs go low when their respective IN_

inputs drop below their specified thresholds. The output

is open drain with a 30µA internal pullup to VCC. For

many applications, no external pullup resistor is required

to interface with other logic devices. An external pullup

resistor to any voltage from 0 to 5.5V overrides the inter-

nal pullup if interfacing to different logic supply voltages.

Internal circuitry prevents reverse current flow from the

external pullup voltage to VCC (Figure 11).

MAX16000

MAX16001

GND

VCC

IN1

INPUT

OUT1

IN2

IN3

OUT

IN4

OUT2

OUT3

OUT4

VTH1 =

(1 + R1) (V

TH + VTH_HYS

)

VTH4 =

(1 + R3) V

Figure 8. Window Detection

VINTH

VTH

R1 = R2

(VINTH )

VTH

- 1

Figure 10. Setting the Adjustable Input

∆VTH

VTH4

VTH1

OUT

OUT4

OUT1

Figure 9. Output Response of Window Detector Circuit

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