LX7001
T
RANSIENT
I
MMUNE
U
NVERVOLTAGE
S
ENSING
C
IRCUIT
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O V A T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
KEY FEATURES
Fully Characterized,
Transient Immune Input
Stage (See Product
Highlight)
Monitors 5V Supplies
(VTRIP=4.6V Typ.)
Outputs Fully Defined At
VCC=1V
Ultra-Low Supply Current
(500µA Max. Over Temp)
Temperature Compensated
ICC For Extremely Stable
Current Consumption
µP Reset Function
Programmable With 1
External Resistor And
Capacitor
Comparator Hysteresis
Prevents Output Oscillation
Electrically Compatible With
Motorola MC34064
Pin-to-Pin Compatible With
Motorola
MC34064/MC34164
APPLICATIONS
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
100
10
1
0.1
100
T
A
(°C)
0 to 70
-40 to 85
-55 to 125
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX7001CDM-TR)
Copyright
©
1999
Rev. 1.2a,2005-03-09
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PRODUCT HIGHLIGHT
ACTIVE
IMMUNE
0
The LX7001 is an improved undervoltage
sensing circuit specifically designed for use
as a reset controller in microprocessor-
based
systems.
Today's
complex
miniaturized systems present difficult
challenges to the system designer such as
overcoming spurious noise problems. The
LX7001 is optimized for systems that must
be tolerant of high-speed power supply
glitches caused by high-speed logic
transitions
and
similar
switching
phenomena. The LX7001 offers a unique
stage that couples glitch immunity with a
micropower, ultra stable band-gap reference
for precision sensing of undervoltage
conditions.
It offers the designer an
economical, space-efficient solution for
low supply voltage detection when used in
combination with a single pull-up resistor.
Adding one capacitor offers the
functionality of a programmable delay
time after power returns. Additionally, the
LX7001 offers excellent temperature
stability. A high-quality trimmed voltage
reference and bias circuit permit very
accurate and repeatable undervoltage
sensing. The remaining blocks consist of a
comparator with hysteresis, high current
clamping diode and open collector output
stage capable of sinking up to 60mA. The
LX7001's RESET output is specified to be
fully functional at VIN=1V.
(t
n
) Noise Pulse Width - ( s)
All Microprocessor Or
Microcontroller Designs
Using 5V Supplies
Simple 5V Undervoltage
Detection
(e
n
) Noise Pulse Amplitude - (mV)
DM
PACKAGE ORDER INFO
Plastic SOIC
Plastic TO-92
LP
3-Pin
8-Pin
LX7001CLP
LX7001ILP
Y
Ceramic Dip
8-Pin
RoHS Compliant / Pb-free
Transition DC:0440
RoHS Compliant / Pb-free
Transition DC:0509
LX7001CDM
LX7001IDM
LX7001MY
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX7001
T
RANSIENT
I
MMUNE
U
NDERVOLTAGE
S
ENSING
C
IRCUIT
P
R O D U C T I O N
D
A T A
S
H E E T
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PA C K A G E P I N O U T S
RESET
V
IN
N.C.
GROUND
1
2
3
4
8
7
6
5
Input Supply Voltage (V
IN
) ............................................................................... -1V to 12V
RESET Output Voltage (V
OUT
) .......................................................................... -1V to 12V
Output Sink Current (I
OL
) ............................................................ Internally Limited (mA)
Clamp Diode Forward Current (I
F
), Pin 1 to pin 2 ............................................... 100mA
Operating Junction Temperature
Ceramic (Y - Package) .......................................................................................... 150°C
Plastic (DM, LP - Packages) .................................................................................. 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C
Peak Package Solder Reflow Temp. (40 second max. exposure)...................................260°C(+0, -5)
Note 1. Values beyond which damage may occur. All voltages are specified with respect to
ground, and all currents are positive into the specified terminal.
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T H E R M A L D ATA
165°C/W
156°C/W
130°C/W
N.C.
N.C.
N.C.
N.C.
Y PACKAGE
(Top View)
RESET
V
IN
N.C.
GROUND
1
2
3
4
8
7
6
5
N.C.
N.C.
N.C.
N.C.
DM PACKAGE
(Top View)
DM PACKAGE:
LP PACKAGE:
Y PACKAGE:
RoHS / Pb-free 100% Matte Tin Lead Finish
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
.
JA
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
.
JA
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
.
JA
3.
GROUND
2.
V
IN
1.
RESET
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
.
JA
).
The
.
JA
numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow
LP PACKAGE
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
2
Copyright © 1999
Rev. 1.2a
10/04
PRODUCT DATABOOK 1996/1997
LX7001
T
RANSIENT
I
MMUNE
U
NDERVOLTAGE
S
ENSING
C
IRCUIT
P
R O D U C T I O N
D
A T A
S
H E E T
R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S
Parameter
Symbol
V
IN
V
OUT
I
F
(Note 2)
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Recommended Operating Conditions
Min.
Typ.
Max.
1
10
10
50mA
Units
V
V
Input Supply Voltage
RESET Output Voltage
Clamp Diode Forward Current
Operating Ambient Temperature Range:
LX7001C
LX7001I
LX7001M
0
-25
-55
70
85
125
°C
°C
°C
Note 2. Range over which the device is functional.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0°C
=
T
A
=
70°C for the LX7001C,
-40°C
=
T
A
=
85°C for the LX7001I, and -55°C
=
T
A
=
125°C for the LX7001M. Low duty cycle pulse testing techniques are used which maintains
junction and case temperatures equal to the ambient temperature.)
Parameter
Comparator Section
Threshold Voltage
High State Output
Low State Output
Hysteresis
Symbol
Test Conditions
LX7001C/7001I/7001M
Min. Typ.
Max.
Units
V
T+
V
T-
V
H
V
IN
Increasing — 4V to 5V
V
IN
Decreasing — 5V to 4V
4.5
4.5
0.01
4.62
4.60
0.02
0.06
0.25
0.3
40
0.01
0.02
0.82
345
4.7
4.7
0.05
1.0
0.4
0.1
60
0.5
2.0
1.2
500
V
V
V
V
V
V
mA
µA
µA
V
µA
RESET
Output Section
Output Sink Saturation Voltage
V
OL
I
OL
I
OH
V
F
Output Sink Current
Output Off-State Leakage
Clamp Diode Forward Voltage
V
IN
= 4.0V, I
OL
= 8.0mA
V
IN
= 4.0V, I
OL
= 2.0mA
V
IN
= 1.0V, I
OL
= 0.1mA
V
OUT
= 4.0V
V
OUT
= 5.0V
V
OUT
= 10V
Pin 1 to pin 2, I
F
= 10mA
V
IN
= 5.0V
10
0.6
Total Device
Supply Current
I
CC
Copyright © 1999
Rev. 1.2a
10/04
3
PRODUCT DATABOOK 1996/1997
LX7001
T
RANSIENT
I
MMUNE
U
NDERVOLTAGE
S
ENSING
C
IRCUIT
P
R O D U C T I O N
D
A T A
S
H E E T
BLOCK DIAGRAM
GRAPH / CURVE INDEX
Characteristic Curves
FIGURE #
1.
2.
3.
4.
5.
6.
7.
8.
9.
RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
POWER-UP RESET VOLTAGE
RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
THRESHOLD VOLTAGE vs. TEMPERATURE
SUPPLY CURRENT vs. INPUT VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
THRESHOLD HYSTERESIS vs. TEMPERATURE
LOW LEVEL OUTPUT CURRENT vs. TEMPERATURE
LOW LEVEL OUTPUT VOLTAGE vs. LOW LEVEL OUTPUT CURRENT
10.
VOLTAGE vs. CLAMP DIODE FORWARD CURRENT
11.
PROPAGATION DELAY
12.
LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE
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V
IN
RESET
1.2 V
REF
GROUND
FIGURE INDEX
Application Circuits
FIGURE #
13.
LOW VOLTAGE MICROPROCESSOR RESET
14.
SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V
15.
VOLTAGE MONITOR
16.
MOSFET LOW VOLTAGE GATE DRIVE PROTECTION
17.
LOW VOLTAGE MICROPROCESSOR RESET with ADDITIONAL
HYSTERESIS
4
Copyright © 1999
Rev. 1.2a
10/04
PRODUCT DATABOOK 1996/1997
LX7001
T
RANSIENT
I
MMUNE
U
NDERVOLTAGE
S
ENSING
C
IRCUIT
P
R O D U C T I O N
D
A T A
S
H E E T
CHARACTERISTIC
CURVES
FIGURE 1.
— RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
10
R
L
= 10K
Power-Up RESET Voltage - (V)
T
A
= 25 C
8
6
4
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2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
200
FIGURE 2.
— POWER-UP RESET VOLTAGE
(V
OUT
) RESET Output Voltage - (V)
V
IN
RESET
2
0
0
2
4
6
8
10
100
300
400
500
(V
IN
) Input Voltage - (V)
(t) Time - ( s)
FIGURE 3.
— RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
5
FIGURE 4.
— THRESHOLD VOLTAGE vs. TEMPERATURE
4.64
(V
OUT
) RESET Output Voltage - (V)
V
T+
Upper Threshold
High State Output
(V
T
) Threshold Voltage - (V)
4
4.62
3
4.60
V
T-
Lower Threshold
Low State Output
2
4.58
1
4.56
0
4.55 4.56 4.57 4.58 4.59 4.60 4.61 4.62 4.63 4.64 4.65
4.54
-55
-25
0
25
50
75
100
125
150
(V
IN
) Input Voltage - (V)
(T
J
) Temperature - ( C)
Copyright © 1999
Rev. 1.2a
10/04
5
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