Impala Linear Corporation
ILC5140/5141/5142
Advance
CMOS Multilevel Voltage Detector
General Description
The ILC514X is an innovative, multilevel voltage detector,
designed to monitor the terminal voltage of a power source
and provide up to four independent flags when the voltage
levels drop below designated levels. The ILC514X is
unique in its design because one device can now signal the
user when a discharging battery goes below four (4) differ-
ent threshold voltages and because it requires no external
precision components to monitor these voltage levels. The
open drain flags are asserted when the terminal voltage
goes below their designated thresholds and are de-assert-
ed 140ms after the thresholds are exceeded. Additionally,
the ILC514X has a manual reset pin that allows the system
to assert all flags for a minimum of 200ms.
Built using Impala’s prorprietary Analog CMOS process, the
ILC514X is packaged in a spacesaving MSOP10 package.
Quiescent current is below 10µA. The threshold values for
the reset flags are factory set. Alternate values may be dis-
cussed with Impala Product Marketing. Threshold values
are accurate to within ±1%. The device is available in three
output configurations: Open Drain RESET, Push Pull
RESET and Push Pull RESET.
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Features
Four levels of a single terminal voltage monitored
No precision external components
< 10µA Quiescent current
Available in three output configurations
ILC5140 Open Drain RESET
ILC5141 Push Pull RESET
ILC5142 Push Pull RESET
Threshold accuracies within ±1%
Small MSOP10 plastic package
Factory preset threshold voltages
Manual reset input pin
Minimum 140ms delay on reset
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Applications
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Handheld PC’s
PDA’s
Notebook PC’s
Battery electronics
Medical Instrumentation
Personal Electronics
Personal Communicators
Ordering Information* T
A
= =40°C to +85°C
ILC514XCS
10-Pin MSOP
Typical Circuit
MR
R
pullup
ILC5140
Measurement
And Control
Circuits
Flag 1
Flag 2
Flag 3
Flag 4
+
Battery
Impala Linear Corporation
ILC514x 1.1
-
(408) 574-3939
www.impalalinear.com
Dec 2000
1
CMOS Multilevel Voltage Detector
Advance
Pin-Package Configurations
To Be Assigned
Pin Number
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
Name
V
IN
GND
CP+
CP-
CPV
SS
MR
F1
F2
F3
F4
Pin Description and Function
Voltage input from power source - battery or power supply
IC Ground Pin
Charge Pump Capacitor +
Charge Pump Capacitor -
Charge Pump V
SS
Manual Reset Input (Connects to CPV
SS
pin)
Connection for output flags. Flags are asserted in order of decreasing voltage
thresholds. F1 is asserted at a higher voltage than F2, F2 is asserted at a high-
er voltage than F3 and F3 is asserted at a higher voltage than F4. Output flags
are: ILC5140 - Open Drain RESET, ILC5141 - Push Pull RESET, ILC5142 -
Push Pull RESET
Impala Linear Corporation
ILC514x 1.1
(408) 574-3939
www.impalalinear.com
Dec 2000
2
CMOS Multilevel Voltage Detector
Advance
Absolute Maximum Ratings (Note 1)
Parameter
Supply Voltage (V+ to GND, or GND to OUT)
All Other Inputs
Output Current Per Flag
Voltage on FLAG pin relative to GND
Rate or Rise, V
CC
Continuous Power Dissipation (T= +85°C)
Operating Temperature Ranges
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (soldering, 10sec)
Package Thermal Resistance
θ
JA
P
D
T
A
T
J(MAX)
T
stg
Symbol
V
CC
V
IN
I
OUT
V
Flg
Ratings
+6
+6
20
V
IN
+ 0.3V
100
470
-40 to +85
170
-40 to +125
300
TBD
Units
V
V
mA
V
V/µs
mW
°C
°C
°C
°C
°C/W
DC Electrical Characteristics ILC514X
Unless otherwise specified, all limits are at T
A
= 25°C
Boldface
limits apply over the operating temperature range.
Parameter
Operating Supply Voltage
(RESET in correct state)
Reset Threshold Voltage
Supply Current
MR Input Voltage
Output Sink Current
Output Voltage Low, RESET
Output Voltage High, RESET
Reset Threshold Tempco
V
OL
V
OH
0.8V
CC
I
CC
V
CC
< 3.6V
V
CC
< 3.6V
Symbol
V
CC
Conditions
T
A
= 0°C to +85°C
T
A
= -40°C to +105°C
Min
1.8
2.0
V
TH
-1%
V
TH
10
-V
CC
3.2
0.4
Typ
Max
5.5
5.5
V
TH
-1%
30
Units
V
V
V
µA
V
mA
V
30-50
V
ppm/°C
AC Electrical Characteristics ILC514X
Parameter
MR Minimum Pulse Width
V
CC
Detect to Flag Enable
V
CC
Detect to Flag Enable
120
Symbol
Condtions
Min
Typ
20
20
240
Max
Units
µs
µs
ms
Impala Linear Corporation
ILC514x 1.1
(408) 574-3939
www.impalalinear.com
Dec 2000
3
CMOS Multilevel Voltage Detector
Advance
V
TH
1
Voltage V
CC
Voltage V
CC
V
TH
2
V
TH
3
V
TH
4
V
TH
1
V
TH
2
V
TH
3
V
TH
4
Time (ms)
140ms
Minimum
Delay
Time (ms)
140ms
Minimum
Delay
Flag 1
Flag 1
Flag 2
Flag 2
Flag 3
Flag 4
Flag 3
Flag 4
Voltage V
CC
V
TH
Time (ms)
140ms
Minimum
Delay
Flag
Clock
400ms
∆t
Voltage V
CC
V
TH
∆V
= 20mV
V
TH
-20mV
Time V
CC
140 ms
Minimum
Delay
Flag
Clock
Impala Linear Corporation
ILC514x 1.1
(408) 574-3939
www.impalalinear.com
Dec 2000
4
CMOS Multilevel Voltage Detector
Advance
Detailed Descripton
The ILC514X is designed to monitor the terminal voltage of a
power source such as a battery and to assert a flag depend-
ing on the internally set threshold voltages. Up to four flags
can be used to warn of declining stages of a battery’s life.
The flags are arranged in order of decreasing threshold val-
ues; therefore Flag 1 is asserted at V
TH1
, Flag 2 is asserted
at a voltage V
TH2
which is lower than V
TH1
and so on. The
ILC514C is ideally suited for systems such as PDA’s, note-
books and personal electronics where multiple warning and
resets are desirable. An example of such a requirement is in
a PDA, where Flag 1 is asserted at V
TH1
= 2.9V “LOW BAT-
TERY WARNING” flag; Flag 2 is asserted at V
TH2
= 2.7V
“DISABLE CMOS WRITE”; Flag 3 is asserted at V
TH3
= 2.5V
“DISABLE IrDA PORT” and Flag 4 is asserted at V
TH4
= 2.3V
“DISABLE SYSTEM EXCEPT CHARGING.”
RESET
AND
Threshold Detect to Flag Enable
The ILC5140 samples the input voltage once every 400 ms.
This sampling rate was chosen to conserve battery life and
at the same time keep a reasonble vigil on the terminal volt-
age level. Once the thrshold has been passed, the flag
enable function reacts within 30µs.
In addition to the 400ms sampling, a sample and hold cir-
cuit compares the input voltage to the most recent sample
and if there is a DV greater than 20mV the input sampling
is turned on continuously until either a flag is asserted or the
threshold is regained. If, during the continuous sampling a
thrshold is crossed, the flag is enabled. This method inher-
ently prevents accidental tripping of the flag during minor
input voltage level glitches.
Once the threshold is crossed on an increasing voltage
level, the flag is disabled 140ms after such a threshold is
detected. This is a minimum time since an addtional 400ms
may be added if the threshold is not detected at the begin-
ning of a regular sampling.
Voltage Thrsholds for the Flags
The flags are labelled Flag 1, Flag 2, Flag 3, Flag 4.
Voltage thrsholds are arranged in order of decreasing volt-
age levels, therefore Flag 1 will have a higher threshold
than Flag 2 and so on.
RESET
The ILC514X has three output configurations: Open Drain
(ILC5140) RESET, Push Pull (ILC5141) RESET and Push
Pull (ILC5142) RESET
Voltage Thresholds
The ILC5140 series will be offered in a variety of voltage
thresholds corresponding to industry standard requirements.
In addition, customer defined voltage thresholds are avail-
able on a special ordering basis. Please consult Impala
marketing for conditions surrounding custom thresholds.
Impala Linear Corporation
ILC514x 1.1
(408) 574-3939
www.impalalinear.com
Dec 2000
5
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