MAX6874 データシートの表示（PDF） - Maxim Integrated

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MAX6874

EEPROM-Programmable, Hex/Quad, Power-Supply Sequencers/Supervisors

Maxim Integrated 

EEPROM-Programmable, Hex/Quad,

Power-Supply Sequencers/Supervisors

Table 1. Programmable Features (continued)

FEATURE

Manual Reset Input

(MR)

Write Disable

Configuration Lock

DESCRIPTION

• Forces PO_ into the active output state when MR = GND

• PO_ deassert after MR releases high and the PO_ timeout period expires

• PO_ cannot be a function of MR only

• Locks user EEPROM based on PO_

• Locks configuration EEPROM

High-Voltage Input (IN1)

IN1 offers threshold voltages of +2.5V to +13.2V in

50mV increments, or +1.25V to +7.625V in 25mV incre-

ments. Use the following equations to set the threshold

voltages for IN1:

x = VTH − 2.5V for + 2.5V to + 13.2V range

0.05V

x = VTH − 1.25V for + 1.25V to + 7.625V range

0.025V

where VTH is the desired threshold voltage and x is the

decimal code for the desired threshold (Table 2). For

the +2.5V to +13.2V range, x must equal 214 or less,

otherwise the threshold exceeds the maximum operat-

ing voltage of IN1.

IN2

IN2 offers thresholds from +2.5V to +5.5V in 50mV

increments, or +1.25V to +3.05V in 25mV increments.

Use the following equations to set the threshold volt-

ages for IN2:

x = VTH − 2.5V for + 2.5V to + 5.5V range

0.05V

x = VTH − 1.25V for + 1.25V to + 3.05V range

0.025V

where VTH is the desired threshold voltage and x is the

decimal code for the desired threshold (Table 3).

For the +2.5V to +5.5V range, x must equal 60 or less,

otherwise the threshold exceeds the maximum operat-

ing voltage of IN2. For the +1V to +3.05V range, x must

equal 72 or less.

IN3–IN6

IN3–IN6 offer positive voltage detectors monitor volt-

ages from +1V to +5.5V in 20mV increments, or +0.5V

to +3.05V in 10mV increments. Use the following equa-

tions to set the threshold voltages for IN_:

x = VTH − 1V for + 1V to + 5.5V range

0.02V

x = VTH − 0.5V for + 0.5V to + 3.05V range

0.01V

where VTH is the desired threshold voltage and x is the

decimal code for the desired threshold (Table 4). For

the +1V to +5.5V range, x must equal 225 or less, oth-

erwise the threshold exceeds the maximum operating

voltage of IN3–IN6.

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