40430B datasheet(4/24 Pages) XICOR

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X40430/X40431 – Preliminary Information

Characteristics subject to change without notice.

4 of 24

REV 1.2.3 11/28/00

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Low Voltage VCC (V1 Monitoring)

During operation, the X40430 monitors the VCC level

and asserts RESET if supply voltage falls below a pre-

set minimum VTRIP1. The RESET signal prevents the

microprocessor from operating in a power fail or

brownout

condition.

The

RESET/RESET

signal

remains active until the voltage drops below 1V. It also

remains active until VCC returns and exceeds VTRIP1

for tPURST.

Low Voltage V2 Monitoring

The X40430 also monitors a second voltage level and

asserts V2FAIL if the voltage falls below a preset mini-

mum VTRIP2. The V2FAIL signal is either ORed with

RESET to prevent the microprocessor from operating

in a power fail or brownout condition or used to inter-

rupt the microprocessor with notiﬁcation of an impend-

ing power failure. The V2FAIL signal remains active

until the V2MON drops below 1V (V2MON falling). It

also remains active until V2MON returns and exceeds

VTRIP2 by 0.2V.

Low Voltage V3 Monitoring

The X40430 also monitors a third voltage level and

asserts V3FAIL if the voltage falls below a preset mini-

mum VTRIP3. The V3FAIL signal is either ORed with

RESET to prevent the microprocessor from operating

in a power fail or brownout condition or used to inter-

rupt the microprocessor with notiﬁcation of an impend-

ing power failure. The V3FAIL signal remains active

until the V3MON drops below 1V (V3MON falling). It

also remains active until V3MON returns and exceeds

VTRIP3 by 0.2V.

Early Low VCC Detection (LOWLINE)

This CMOS output goes LOW earlier than RESET/

RESET whenever VCC falls below the VTRIP1 voltage

and returns high when VCC exceeds the VTRIP1 volt-

age. There is no power up delay circuitry (tPURST) on

this pin.

Figure 2. Two Uses of Multiple Voltage Monitoring

Unreg.

Supply

VCC

Reg

V2MON

X40430

Resistors selected so 3V appears on V2MON when unregulated

supply reaches 6V.

Unreg.

Supply

VCC

X40431

RESET

V2FAIL

System

VCC

Reset

RESET

V2FAIL

System

Reset

Notice: No external components required to monitor three voltages.

V3MON

V3FAIL

V2MON

V3MON

V2MON

Reg

V2MON

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