New Features
• Monitor Voltages: 5V to 0.9V
• Independent Core Voltage Monitor
Preliminary Datasheet
X40010/X40011/X40014/X40015
Dual Voltage Monitor with Integrated CPU Supervisor
FEATURES
• Industrial Systems
—Process Control
—Intelligent Instrumentation
• Computer Systems
—Computers
• Dual voltage detection and reset assertion
—Standard reset threshold settings
See Selection table on page 2.
—Adjust low voltage reset threshold voltages
using special programming sequence
—Network Servers
—Reset signal valid to V = 1V
CC
DESCRIPTION
—Monitor three voltages or detect power fail
• Independent Core Voltage Monitor (V2MON)
• Fault detection register
• Selectable power on reset timeout (0.05s,
0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval (25ms, 200ms,
1.4s, off)
• Low power CMOS
The X40010/11/14/15 combines power-on reset con-
trol, watchdog timer, supply voltage supervision, and
secondary voltage supervision, in one package. This
combination lowers system cost, reduces board space
requirements, and increases reliability.
Applying voltage to V
activates the power on reset
CC
circuit which holds RESET/RESET active for a period of
time.This allows the power supply and system oscillator
to stabilize before the processor can execute code.
—25µA typical standby current, watchdog on
—6µA typical standby current, watchdog off
• 400kHz 2-wire interface
• 2.7V to 5.5V power supply operation
• Available packages
—8-lead SOIC,TSSOP
Low V
detection circuitry protects the user’s system
CC
from low voltage conditions, resetting the system when
V
falls below the minimum V point. RESET/
CC
TRIP1
RESET is active until V
returns to proper operating
CC
APPLICATIONS
level and stabilizes. A second voltage monitor circuit
tracks the unregulated supply to provide a power fail
warning or monitors different power supply voltage.
Three common low voltage combinations are avail-
able, however, Xicor’s unique circuits allows the
• Communication Equipment
—Routers, Hubs, Switches
—Disk Arrays, Network Storage
BLOCK DIAGRAM
Watchdog Timer
and
Reset Logic
Fault Detection
Data
Register
WDO
Register
SDA
SCL
Status
Register
Command
Decode Test
& Control
Logic
RESET
Threshold
Reset Logic
X40010/14
Power on,
Low Voltage
Reset
RESET
X40011/15
V
CC
+
(V1MON)
Generation
User Programmable
-
V
V2MON
TRIP1
V
CC
+
-
V2FAIL
V2MON
User Programmable
V
*X40010/11 = V2MON*
X40014/15 = V
TRIP2
CC
Characteristics subject to change without notice. 1 of 25
REV 1.3.4 7/12/02
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