X40431 XICOR [Xicor Inc.], X40431 Datasheet - Page 4

• Manufacturer Part Number: X40431
• Description: 4kbit EEPROM, Triple Voltage Monitor with Integrated CPU Supervisor
• Manufacturer: XICOR [Xicor Inc.]

X40430/X40431 – Preliminary Information
Low Voltage V
During operation, the X40430 monitors the V
and asserts RESET if supply voltage falls below a pre-
set minimum V
microprocessor from operating in a power fail or
brownout
remains active until the voltage drops below 1V. It also
remains active until V
for
Low Voltage V2 Monitoring
The X40430 also monitors a second voltage level and
asserts V2FAIL if the voltage falls below a preset mini-
mum V
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
V
Low Voltage V3 Monitoring
The X40430 also monitors a third voltage level and
asserts V3FAIL if the voltage falls below a preset mini-
mum V
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
V
Early Low V
This CMOS output goes LOW earlier than RESET/
RESET whenever V
and returns high when V
age. There is no power up delay circuitry (t
this pin.
REV 1.2.3 11/28/00
TRIP2
TRIP3
t
PURST
TRIP2
TRIP3
by 0.2V.
by 0.2V.
.
condition. The
. The V2FAIL signal is either ORed with
. The V3FAIL signal is either ORed with
CC
TRIP1
CC
Detection (LOWLINE)
(V1 Monitoring)
CC
. The RESET signal prevents the
CC
falls below the V
CC
returns and exceeds V
exceeds the V
RESET/RESET
TRIP1
TRIP1
PURST
CC
voltage
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signal
TRIP1
level
volt-
) on
Figure 2. Two Uses of Multiple Voltage Monitoring
Notice: No external components required to monitor three voltages.
Unreg.
Supply
Resistors selected so 3V appears on V2MON when unregulated
Unreg.
Supply
R
R
Reg
Reg
Reg
3V
4V
5V
Characteristics subject to change without notice.
Reg
supply reaches 6V.
5V
V
V2MON
V3MON
CC
X40431
V2MON
V
RESET
V2FAIL
V3FAIL
CC
X40430
RESET
V2FAIL
V
CC
V2MON
V3MON
V2MON
System
Reset
System
Reset
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