®
PRELIMINARY
Data Sheet
X40030, X40031, X40034, X40035
May 25, 2006
FN8114.1
Triple Voltage Monitor with Integrated
CPU Supervisor
FEATURES
• Triple voltage detection and reset assertion
—Standard reset threshold settings
see selection table on page 5.
—Adjust low voltage reset threshold voltages
using special programming sequence
—Reset signal valid to VCC = 1V
—Monitor three seperate voltages
• Fault detection register
• Selectable power on reset timeout
(0.05s, 0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval
(25ms, 200ms, 1.4s or off)
• Debounced manual reset input
• Low power CMOS
—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 in 14 Ld SOIC, TSSOP packages
•www.DataSheet4U.com Monitor voltages: 5V to 0.9V
• Independent core voltage monitor
• Pb-free plus anneal available (RoHS compliant)
APPLICATIONS
• Communication equipment
—Routers, hubs, switches
—Disk arrays, network storage
BLOCK DIAGRAM
• Industrial systems
—Process control
—Intelligent instrumentation
• Computer systems
— Computers
—Network servers
DESCRIPTION
The X40030, X40031, X40034, X40035 combine
power-on reset control, watchdog timer, supply voltage
supervision, second and third voltage supervision, and
manual reset, in one package. This combination lowers
system cost, reduces board space requirements, and
increases reliability.
Applying voltage to VCC activates the power on reset cir-
cuit 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.
Low VCC detection circuitry protects the user’s system
from low voltage conditions, resetting the system when
VCC falls below the minimum VTRIP1 point.
RESET/RESET is active until VCC returns to proper
operating level and stabilizes. A second and third 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
available, however, Intersil’s unique circuits allows the
threshold for either voltage monitor to be reprogrammed
to meet specific system level requirements or to fine-tune
the threshold for applications requiring higher precision.
V3MON
V2MON
V3LMoognicitor
+
-
V2LMogoincitor
VTRIP3
+
-
VCC or
V2MON*
VTRIP2
V3FAIL
V2FAIL
SDA
WP
SCL
VCC
(V1MON)
Data
Register
Command
Decode Test
& Control
Logic
Fault Detection
Register
Status
Register
VCCLoMgoicnitor
+
VTRIP1
-
Watchdog
and
Reset Logic
Power on,
Manual Reset
Low Voltage
Reset
Generation
WDO
MR
RESET
X40030/34
RESET
X40031/35
LOWLINE
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
