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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
P
N N O V A T I O N
R O D U C T I O N
D
A T A
H E E T
KEY FEATURES
DESCRIPTION
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.
„ 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
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The LX7001 is an improved undervoltage
sensing circuit specifically designed for use
as a reset controller in microprocessorbased
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
S
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
(t n) Noise Pulse Width - ( s)
100
APPLICATIONS
„ All Microprocessor Or
Microcontroller Designs
Using 5V Supplies
„ Simple 5V Undervoltage
Detection
ACTIVE
10
IMMUNE
1
O
0.1
100
0
(en) Noise Pulse Amplitude - (mV)
TA (°C)
0 to 70
-40 to 85
-55 to 125
DM
PACKAGE ORDER INFO
Plastic SOIC
Plastic TO-92
LP 3-Pin
8-Pin
RoHS Compliant / Pb-free
Transition DC:0440
RoHS Compliant / Pb-free
Transition DC:0509
LX7001CDM
LX7001IDM
LX7001CLP
LX7001ILP
Ceramic Dip
8-Pin
Y
LX7001MY
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
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 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
A B S O L U T E M A X I M U M R AT I N G S
D
A T A
S
H E E T
(Note 1)
RESET
VIN
N.C.
GROUND
1
8
2
7
3
6
4
5
N.C.
N.C.
N.C.
N.C.
Y PACKAGE
(Top View)
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Input Supply Voltage (VIN) ............................................................................... -1V to 12V
RESET Output Voltage (VOUT) .......................................................................... -1V to 12V
Output Sink Current (IOL) ............................................................ Internally Limited (mA)
Clamp Diode Forward Current (IF), 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
PA C K A G E P I N O U T S
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.
7
3
6
4
5
N.C.
N.C.
N.C.
N.C.
165°C/W
LP PACKAGE:
3. GROUND
156°C/W
Y PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, . JA
8
2
RoHS / Pb-free 100% Matte Tin Lead Finish
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, . JA
1
DM PACKAGE
(Top View)
T H E R M A L D ATA
THERMAL RESISTANCE-JUNCTION TO AMBIENT, . JA
RESET
VIN
N.C.
GROUND
2. VIN
1. RESET
130°C/W
LP PACKAGE
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
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Junction Temperature Calculation: TJ = TA + (PD 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
2
Copyright © 1999
Rev. 1.2a 10/04
PRODUCT DATABOOK 1996/1997
LX7001
T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT
P
D
R O D U C T I O N
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
Input Supply Voltage
RESET Output Voltage
Clamp Diode Forward Current
Operating Ambient Temperature Range:
LX7001C
LX7001I
LX7001M
VIN
VOUT
IF
(Note 2)
Recommended Operating Conditions
Min.
Typ.
Max.
1
Units
10
V
V
70
85
125
°C
°C
°C
10
50mA
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0
-25
-55
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 = TA = 70°C for the LX7001C,
-40°C = TA = 85°C for the LX7001I, and -55°C = TA = 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
Symbol
Test Conditions
LX7001C/7001I/7001M
Min. Typ.
Max.
Units
Comparator Section
Threshold Voltage
High State Output
Low State Output
Hysteresis
VT+
VTVH
VIN Increasing — 4V to 5V
VIN Decreasing — 5V to 4V
4.5
4.5
0.01
4.62
4.60
0.02
4.7
4.7
0.05
V
V
V
10
0.06
0.25
0.3
40
0.01
0.02
0.82
1.0
0.4
0.1
60
0.5
2.0
1.2
V
V
V
mA
µA
µA
V
345
500
µA
RESET Output Section
Output Sink Saturation Voltage
Output Sink Current
Output Off-State Leakage
IOL
IOH
Clamp Diode Forward Voltage
VF
VIN = 4.0V, IOL = 8.0mA
VIN = 4.0V, IOL = 2.0mA
VIN = 1.0V, IOL = 0.1mA
VOUT = 4.0V
VOUT = 5.0V
VOUT = 10V
Pin 1 to pin 2, IF = 10mA
ICC
VIN = 5.0V
VOL
0.6
Total Device
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Supply Current
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
VIN
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RESET
1.2 VREF
GROUND
GRAPH / CURVE INDEX
FIGURE INDEX
Characteristic Curves
FIGURE #
Application Circuits
FIGURE #
1.
RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
13. LOW VOLTAGE MICROPROCESSOR RESET
2.
POWER-UP RESET VOLTAGE
14. SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V
3.
RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
15. VOLTAGE MONITOR
4.
THRESHOLD VOLTAGE vs. TEMPERATURE
16. MOSFET LOW VOLTAGE GATE DRIVE PROTECTION
5.
THRESHOLD HYSTERESIS vs. TEMPERATURE
6.
SUPPLY CURRENT vs. INPUT VOLTAGE
17. LOW VOLTAGE MICROPROCESSOR RESET with ADDITIONAL
HYSTERESIS
7.
SUPPLY CURRENT vs. TEMPERATURE
8.
LOW LEVEL OUTPUT CURRENT vs. TEMPERATURE
9.
LOW LEVEL OUTPUT VOLTAGE vs. LOW LEVEL OUTPUT CURRENT
10. VOLTAGE vs. CLAMP DIODE FORWARD CURRENT
11. PROPAGATION DELAY
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12. LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE
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
CHARACTERISTIC
FIGURE 1. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
H E E T
CURVES
FIGURE 2. — POWER-UP RESET VOLTAGE
2.0
10
RL = 10K
1.8
Power-Up RESET Voltage - (V)
TA = 25 C
8
1.6
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(VOUT) RESET Output Voltage - (V)
S
A T A
6
4
2
1.4
VIN
1.2
1.0
0.8
0.6
RESET
0.4
0.2
0
0
0
2
4
6
8
0
10
200
100
4.64
4
3
2
1
0
4.55 4.56 4.57 4.58 4.59 4.60 4.61 4.62 4.63 4.64 4.65
(VIN) Input Voltage - (V)
(VT) Threshold Voltage - (V)
VT+ Upper Threshold
High State Output
O
(VOUT) RESET Output Voltage - (V)
500
FIGURE 4. — THRESHOLD VOLTAGE vs. TEMPERATURE
5
Copyright © 1999
Rev. 1.2a 10/04
400
(t) Time - ( s)
(VIN) Input Voltage - (V)
FIGURE 3. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
300
4.62
4.60
VT- Lower Threshold
Low State Output
4.58
4.56
4.54
-55
-25
0
25
50
75
100
125
150
(TJ) Temperature - ( C)
5
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
CHARACTERISTIC
FIGURE 5. — THRESHOLD HYSTERESIS vs. TEMPERATURE
S
A T A
H E E T
CURVES
FIGURE 6. — SUPPLY CURRENT vs. INPUT VOLTAGE
30
1000
-55 C
(ICC) Supply Current - ( A)
26
800
-40 C
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(VH) Hysteresis Voltage - (mV)
RESET Load = 10K
22
18
14
10
-55
+25 C
600
400
+125 C
200
0
-25
0
25
50
75
100
125
0
150
4
2
(TJ) Temperature - ( C)
6
8
10
(VIN) Input Voltage - (V)
FIGURE 7. — SUPPLY CURRENT vs. TEMPERATURE
FIGURE 8. — LOW LEVEL OUTPUT CURRENT vs. TEMPERATURE
80
1200
1100
1000
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900
800
700
600
10V
500
400
300
5V
200
(IOL) Low Level Output Current - (mA)
1300
(ICC) Supply Current - ( A)
+85 C
70
60
50
40
30
20
10
100
0
-55
-25
0
25
50
75
100
(TJ) Temperature - ( C)
6
125
150
0
-55
-25
0
25
50
75
100
125
150
(TJ) Temperature - ( C)
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
CHARACTERISTIC
H E E T
CURVES
FIGURE 10. — VOLTAGE vs. CLAMP DIODE FORWARD
CURRENT
FIGURE 9. — LOW LEVEL OUTPUT VOLTAGE
vs. LOW LEVEL OUTPUT CURRENT
2000
1.2
1.1
(VF) Forward Voltage - (V)
-55 C
1500
25 C
125 C
1000
500
-40 C
1
0.9
0.8
125 C
85 C
0.7
25 C
0.6
0
0
10
20
30
0.5
40
0
10
(ISINK) Low Level Output Current - (mA)
5.5
(VOL) Low Level Output Voltage - (mV)
RESET
REF
4.5
O
VIN - (V)
4V
4.0
RESET - (V)
6.0
4.0
2.0
0
0
2
4
6
40
50
60
70
80
90 100
80
10K
5V
5.0
30
FIGURE 12. — LOW LEVEL OUTPUT VOLTAGE
vs. TEMPERATURE
VIN
TA = 25 C
20
(IF) Forward Current - (mA)
FIGURE 11. — PROPAGATION DELAY
8
10
(t) Time - ( s)
Copyright © 1999
Rev. 1.2a 10/04
-55 C
RESET = 0V
VIN = 4V
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(VOL) Low Level Output Voltage - (mV)
S
A T A
12
14
16
70
VIN = 1V
ISINK = 100 A
60
50
40
30
20
10
0
-55
-25
0
25
50
75
100
125
150
(TJ) Temperature - ( C)
7
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
T Y P I C A L A P P L I C AT I O N C I R C U I T S
FIGURE 14. — SWITCHING THE LOAD OFF WHEN
BATTERY REACHES BELOW 4.3V.
FIGURE 13. — LOW VOLTAGE MICROPROCESSOR RESET.
VIN
R
RESET
POWER
SUPPLY
MICROPROCESSOR
CIRCUIT
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CDLY
VIN
LOAD
1.2 VREF
RESET
A time delayed reset can be accomplished with the addition of CDLY.
For systems with extremely fast power supply rise times (< 500ns) it
is recommended that the RCDLY time constant be greater than 5.0µs.
VTH(MPU) is the microprocessor reset input threshold.
tDLY = R CDLY In
1.2 VREF
1
VTH(MPU)
1VIN
FIGURE 15. — VOLTAGE MONITOR.
FIGURE 16. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION.
1.0k
VIN
270
4.3V
VCC
RL
SMP60N03-10L
VIN
RESET
POWER
SUPPLY
O
RESET
1.2 VREF
1.2 VREF
Overheating of the logic level power MOSFET due to insufficient gate
voltage can be prevented with the above circuit. When the input signal is
below the 4.3 volt threshold of the LX7001C, its output grounds the gate
of the L2 MOSFET.
8
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
T Y P I C A L A P P L I C AT I O N C I R C U I T S
(Con't.)
FIGURE 17. — LOW VOLTAGE MICROPROCESSOR RESET
with ADDITIONAL HYSTERESIS.
TEST DATA
RH
POWER
SUPPLY
VIN
RL
MICROPROCESSOR
CIRCUIT
. VTH
(mV)
0
3.4
6.8
6.8
10
10
16
16
34
34
51
51
RH
(. )
0
10
20
20
30
30
47
47
100
100
150
150
RL
(. )
0
1.5
4.7
1.5
2.7
1.5
2.7
1.5
2.7
1.5
2.7
1.5
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IIN
VH
(mV)
20
51
40
81
71
112
100
164
190
327
276
480
RESET
VH =
4.6 RH
+ 0.02
RL
. VTH (LOWER) = 340 RH x 10-6
1.2 VREF
Where: RH = 150.
RL = 1.5. = 10k.
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Comparator hysteresis can be increased with the addition of resistor RH. The
hysteresis equation has been simplified and does not account for the change of
input current IIN as VCC crosses the comparator threshold. An increase of the
lower threshold . VTH (LOWER) will be observed due to IIN which is typically 340µA at
4.59V. The equations are accurate to ±10% with RH less than 150. and RL
between 1.5k. and 10k. .
PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document
may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.
Copyright © 1999
Rev. 1.2a 10/04
9