MICROSEMI LX6433CSE

LX6433
®
TM
Precision Voltage Monitor
P RODUCTION D ATA S HEET
DESCRIPTION
KEY FEATURES
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ƒ Precise Threshold Detection
1.105V ±0.02V
ƒ 3V to 6.0V Operating Range
ƒ Active Low RESET, Sink
Current > 1mA
ƒ RESET Pulse Duration
Controlled, typical 100mS
ƒ Quiescent Current < 40μA
ƒ Wide Temperature: 0-85°C
ƒ No External Components
Required
ƒ SOT-23, 5-Pin Package, RoHS
Compliant (Pb-Free)
ƒ Similar Devices: FM803,
NCP803 and LM3724
The monitor operates over a supply
range (VIN) of 3V to 6V. The RESET
line is capable of sinking an output
load current of 1mA. This line is
protected from short circuit to VIN or
Ground without damage.
Tight threshold detection allows for a
1.085V to 1.125V window over
temperature.
System efficiency is
maintained with ultra low IQ of 20µA.
The 5 pin SOT-23 package provides
a small form factor similar to industry
standard device types in this category.
This package is RoHS compliant
allowing Pb free PCB assembly.
The LX6433 is a precise voltage
monitor programmed to signal a low
supply line condition. VMON is
connected to the “monitored” supply
line, when VMON drops below the
threshold of 1.085V, RESET line
goes low. When power is restored
and VMON moves above the
threshold voltage, RESET remains
low for an additional 100ms to ensure
system reset is fully applied.
Digital filtering inside the LX6433
ignores temporary dips in the VMON
line lasting for less than 10µS to
avoid false triggering.
APPLICATIONS/BENEFITS
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
ƒ Portable Microprocessor Core
Voltage Supply Monitor
ƒ Supply Monitoring: 1.2V, 2.5V,
3.3V, 5V or any other level.
PRODUCT HIGHLIGHT
1.2V Supply
Microprocessor / ASIC
LX6433CSE
3.3 to 5V
VIN
VMON
R Pull-up
(Optional)
VCC
RESET
Reset
GND
Ground
Figure 1 – LX6433 Typical Application Circuit
LX6433
TA(°C)
PACKAGE ORDER INFORMATION
Plastic SOT-23
Supply
Fault Detection
5-PIN (Pb Free)
SE
Voltage (VIN)
Threshold Voltage
Device Marking
RoHS Compliant / Pb-free
0 to 85
3 to 6V
1.105V +/-1.8%
LX6433CSE
2975
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX6433CSE-TR)
Copyright © 2003
Rev. 1.1, 2009-02-11
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX6433
®
TM
Precision Voltage Monitor
P RODUCTION D ATA S HEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
GND
1
N.C.
2
RESET
3
5
VIN
4
VMON
SE PACKAGE
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
(Top View)
RoHS / Pb-free 100% Matte Tin Pin Finish
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Input Voltage (IN) ............................................................................................-0.3V to 7.0V
Monitor (VMON) .............................................................................................-0.3V to 7.0V
RESET to GND ....................................................................................-0.3V to (VIN + 0.3V)
Operating Temperature Range.....................................................................-40°C to +125°C
Storage Temperature Range, TA .................................................................... -65°C to 150°C
Maximum Junction Temperature..................................................................................150°C
RoHS / Pb-free Peak Package Solder Reflow Temperature
(40 seconds maximum exposure) .................................................................... 260°C (+0,-5)
THERMAL DATA
SE
Plastic SOT-23 5-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
300°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of
the above assume no ambient airflow.
FUNCTIONAL PIN DESCRIPTION
NAME
VIN
VMON
GND
RESET
DESCRIPTION
Supply voltage, Operational From 3.0V to 6.0V.
Monitored input of 1.2V supply.
Circuit ground.
Output pin, low level indicates fault mode.
ELECTRICAL CHARACTERISTICS
Specifications apply over the ambient temperature of: 0oC < T < 85°C for VIN = 5V (except where otherwise noted). Typical values are at TA=25°C.
Parameter
Symbol
` Operating Range
VINOP
Test Conditions
Functional operation (correct logic state for
RESET)
VMON rising, RESET = high (after timeout
cycle is completed)
Reset High
VMONTH+
Reset Low
VMONTH-
VMON falling, RESET = low
RESET PW
Time RESET remains low after VMON rises
above the threshold
RESET Pulse Duration
IQ
VMON
TRANSIENT
VMON Transient Filter
VMON
TRIGGER PW
Typ
3.0
Units
6.0
V
1.085
50
V
100
RESET Open
RESET unchanged for VMON drop below
VMONTHRESET activated for momentary dip in VMON
below VMONTH-
Max
1.125
V
150
mS
40
µA
10
µS
5
µS
RESET VOUT LOW
VOL
ISINK = 10mA, VIN = 5V ± 10%
.05
0.4
V
RESET VOUT LOW
VOL
ISINK = 20mA, VIN = 5V ±10% TA 0°C to 70°C
.05
0.4
V
RESET Leakage
ILKG
VMON > 1.2V, VRESET = 5V
.02
1
µA
11
µS
RESET DELAY after Trigger
Copyright © 2003
Rev. 1.1, 2009-02-11
TDELAY
Time from VMON falling below threshold to
RESET going low, VMON overdrive of 50mV.
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
ELECTRICALS
Quiescent Current (Ground Pin)
Min
Page 2
LX6433
®
TM
Precision Voltage Monitor
P RODUCTION D ATA S HEET
SIMPLIFIED BLOCK DIAGRAM
VMON
VIN
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CLOCK
1.6MHz
REF
Pulse Qualifier
Divide by
24
+
RESET Output
-
OUTPUT
RESET
Divide by
217
SET
Clock
Negative Edge Detector
GND
Figure 2 – Simplified Block Diagram
5V
VIN
1V
0V
**
1.5V
* * *
“THRESHOLD”
1.0V
VMON
0.5V
0.0V
5V
100ms
(typ.)
3V
100ms
(typ.)
100ms
(typ.)
RESET
* * *
0V
T0
T1
T2
T3
T4
T5 T6 T7
T8
T9 T10 T11 T12
T13 T15
T14 T16
BLOCK DIAGRAM
T0: RESET invalid logic state for VIN < 2V
T1- T1 Vmonitor exceeds Threshold, at T1, RESET pulse remains low for 100ms until T2.
T3 - T4: Transient on VIN is ignored, less than 10usec duration for Vmonitor < THRESHOLD. (Same applies for *)
T5: Vmonitor drops below Threshold, remains low for > 10usec which activates RESET Low.
T6: Vmonitor rises above Threshold but previous fault at T5 has not cycled through full timeout (T 6-T7 < 50mS), RESET remains low.
T7: Vmonitor fals below Threshold, RESET remains low.
T7-T8 duration > 10uS, RESET timer restarted for 100mS timeout
T8-T9: Duration exceeds 150ms, RESET timer cycle completed, output rises
T10-T11: Vmonitor falls below Threshold for > 10uS, RESET signal goes low.
T13-T14, T15-T16 :Vmonitor is above Threshold, no limits apply for peak voltage or duration.
Figure 3 – Timing Diagram
Copyright © 2003
Rev. 1.1, 2009-02-11
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX6433
®
TM
Precision Voltage Monitor
P RODUCTION D ATA S HEET
FUNCTIONAL DESCRIPTION
As VMON ramps upwards from zero, RESET is held
low until VMON exceeds the threshold, this starts an
internal 100ms timer which continues to hold RESET
low for that interval. As long as VMON remains above
the threshold level and the 100ms timer has completed
the cycle, RESET remains high (high impedance state).
If a transient of less than 10uS interrupts VMON
causing a drop below the threshold the LX6433 will
ignore the event. If VMON does drop below the
threshold for greater than 12µS the RESET will remain
low until VMON recovers above the threshold and the
RESET time pulse has been timed out (100ms).
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The LX6433 operates as a power supply monitor with a
threshold window of 1.085V to 1.125V (±1.8%) that
can be programmable using external resistors. The
VMON pin is the input to the internal comparator and
VIN is the power source for the IC. The RESET pin is
an open drain, with active low logic. An external pullup resistor can be used if the device (ASIC) driven
does not provide this feature.
PACKAGE DIMENSIONS
SE
5 Pin Plastic SOT-23
D
G
H
E
A1
A
C
B
F
J
I
Dim
A
A1
B
C
D
E
F
G
H
I
J
K
MILLIMETERS
MIN
MAX
0.90
1.30
0.90
1.45
0.25
0.50
0.09
0.20
2.80
3.10
1.50
1.75
0.95 BSC
1.90 BSC
2.60
3.00
0.35
0.55
0.00
0.15
10° MAX
INCHES
MIN
MAX
0.035
0.051
0.035
0.057
0.010
0.020
0.004
0.008
0.110
0.122
0.059
0.069
0.038 BSC
0.075 BSC
0.102
0.118
0.014
0.022
0.000
0.006
10° MAX
K
Note:
Copyright © 2003
Rev. 1.1, 2009-02-11
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
MECHANICALS
1. Controlled dimensions are in mm, inches are for
reference only.
2. Dimensions do not include mold flash or protrusions;
these shall not exceed 0.155mm (.006”) on any side.
Lead dimension shall not include solder coverage
Page 4
LX6433
®
TM
Precision Voltage Monitor
P RODUCTION D ATA S HEET
CHARACTERISTIC CURVES
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VIN
VIN
MONITOR
/RESET
MONITOR
/RESET
Figure 4 Reset Pulse Width after VMONITOR “GOOD”
VMONITOR Droop Pulse Width:
5uS
5uS
10uS
10us
Figure 5 Reset Delay after VMONITOR Falls
VIN
/RESET
Copyright © 2003
Rev. 1.1, 2009-02-11
Figure 7 Start-up for VIN
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
CHARTS
Figure 6 VMONITOR Digital Filter, Reset Logic Ignores Pulse
Widths of < 5μS
(VMONITOR = 0V)
Page 5
LX6433
TM
®
Precision Voltage Monitor
P RODUCTION D ATA S HEET
NOTES
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NOTES
PRODUCTION DATA – Information contained in this document is proprietary to
Microsemi and is current as of publication date. This document may not be modified in
any way without the express written consent of Microsemi. Product processing does not
necessarily include testing of all parameters. Microsemi reserves the right to change the
configuration and performance of the product and to discontinue product at any time.
Copyright © 2003
Rev. 1.1, 2009-02-11
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6