Datasheet LX7001MY, LX7001ILP, LX7001IDM, LX7001CLP, LX7001CDM Datasheet (Microsemi Corporation)
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LX7001
0
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
T HE I NFINITE P OWER OF I NNOVATION
DESCRIPTION
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 challanges 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, ultrastable band-gap reference for precision sensing of undervoltage conditions. It offers the designer an
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
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.
PRODUCT HIGHLIGHT
INPUT TRANSIENT IMMUNITY
100
P RODUCTION DATA SHEET
KEY FEATURES
■ Fully Characterized, Transient Immune
Input Stage
(See Product Highlight)
■ Monitors 5V Supplies (V
■ 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
■■
■ All Microprocessor Or Microcontroller
■■
Designs Using 5V Supplies
■■
■ Simple 5V Undervoltage Detection
■■
=4.6V Typ.)
TRIP
10
1
) Noise Pulse Width - (µs)
n
(t
0.1
100
IMMUNE
(en) Noise Pulse Amplitude - (mV)
(°C)
T
A
0 to 70 LX7001CDM LX7001CLP —
-40 to 85 LX7001IDM LX7001ILP —
-55 to 125 — — LX7001MY
ACTIVE
100
PACKAGE ORDER INFORMATION
Plastic SOIC
DM
8-pin
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX7001CDMT)
Plastic TO-92
LP
3-pin
Ceramic Dip
Y
8-pin
Copyright © 1999
Rev. 1.2 6/99
L INF INITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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LX7001
PRODUCT DATABOOK 1996/1997
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN) ............................................................................... -1V to 12V
RESET Output Voltage (V
Output Sink Current (I
Clamp Diode Forward Current (IF), Pin 1 to pin 2............................................... 100mA
) .......................................................................... -1V to 12V
OUT
) ............................................................ Internally Limited (mA)
OL
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
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.
THERMAL DATA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
LP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
Y PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
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
θθ
θ
θθ
JA
θθ
θ
θθ
JA
θθ
θ
θθ
JA
165°C/W
156°C/W
130°C/W
PACKAGE PIN OUTS
1 8
RESET
N.C.
GROUND
RESET
V
N.C.
GROUND
2 7
V
IN
3 6
4 5
Y PACKAGE
(Top View)
IN
DM PACKAGE
(Top View)
LP PACKAGE
(Top View)
18
27
36
45
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
3. GROUND
2. V
IN
1. RESET
2
Copyright © 1999
Rev. 1.2 6/99
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PRODUCT DATABOOK 1996/1997
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
RECOMMENDED OPERATING CONDITIONS (Note 2)
LX7001
Parameter
Input Supply Voltage V
RESET Output Voltage V
Clamp Diode Forward Current I
Operating Ambient Temperature Range:
LX7001C
LX7001I
LX7001M
Note 2. Range over which the device is functional.
Symbol
IN
OUT
F
Recommended Operating Conditions
Min. Typ. Max.
110V
10 V
50mA
070°C
-25 85 °C
-55 125 °C
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 Units
LX7001C/7001I/7001M
Min. Typ. Max.
Comparator Section
Threshold Voltage
High State Output V
Low State Output V
Hysteresis V
VIN Increasing — 4V to 5V
T+
VIN Decreasing — 5V to 4V
TH
4.5 4.62 4.7 V
4.5 4.60 4.7 V
0.01 0.02 0.05 V
RESET Output Section
Output Sink Saturation Voltage VIN = 4.0V, IOL = 8.0mA
V
Output Sink Current I
Output Off-State Leakage I
Clamp Diode Forward Voltage VFPin 1 to pin 2, IF = 10mA
OL
OHVOUT
= 4.0V, IOL = 2.0mA
OLVIN
VIN = 1.0V, IOL = 0.1mA
V
= 4.0V
OUT
= 5.0V
V
= 10V
OUT
0.06 1.0 V
0.25 0.4 V
0.3 0.1 V
10 40 60 mA
0.01 0.5 µA
0.02 2.0 µA
0.6 0.82 1.2 V
Total Device
Supply Current I
CC
VIN = 5.0V
345 500 µA
Units
Copyright © 1999
Rev. 1.2 6/99
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LX7001
PRODUCT DATABOOK 1996/1997
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
BLOCK DIAGRAM
V
IN
RESET
1.2 V
REF
GROUND
GRAPH / CURVE INDEX FIGURE INDEX
Characteristic Curves
FIGURE #
1. RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
2. POWER-UP RESET VOLTAGE
3. RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
4. THRESHOLD VOLTAGE vs. TEMPERATURE
5. THRESHOLD HYSTERESIS vs. TEMPERATURE
6. SUPPLY CURRENT vs. INPUT VOLTAGE
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
12. LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE
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
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Copyright © 1999
Rev. 1.2 6/99
Page 5
PRODUCT DATABOOK 1996/1997
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
CHARACTERISTIC CURVES
LX7001
FIGURE 1. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
10
RL = 10K
T
= 25 C
A
8
6
4
) RESET Output Voltage - (V)
2
OUT
(V
0
04 10
268
(VIN) Input Voltage - (V)
FIGURE 3. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
FIGURE 2. — POWER-UP RESET VOLTAGE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
V
IN
RESET
0.4
Power-Up RESET Voltage - (V)
0.2
0
0 200 500
100 300 400
(t) Time - ( s)
FIGURE 4. — THRESHOLD VOLTAGE vs. TEMPERATURE
) RESET Output Voltage - (V)
OUT
(V
Copyright © 1999
Rev. 1.2 6/99
5
4
3
2
1
0
4.55
4.56 4.58 4.59 4.60 4.61 4.62 4.63 4.64 4.65
4.57
(VIN) Input Voltage - (V)
) Threshold Voltage - (V)
(V
4.64
Upper Threshold
V
T+
High State Output
4.62
4.60
4.58
T
4.56
4.54
-55
-25 0 25 50 75 100 125 150
Lower Threshold
V
T-
Low State Output
(TJ) Temperature - ( C)
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LX7001
PRODUCT DATABOOK 1996/1997
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 5. — THRESHOLD HYSTERESIS vs. TEMPERATURE
30
RESET Load = 10K
26
22
18
) Hysteresis Voltage - (mV)
H
14
(V
10
-55 -25 0 25 50 75 100 125 150
(TJ) Temperature - ( C)
FIGURE 6. — SUPPLY CURRENT vs. INPUT VOLTAGE
1000
800
600
400
) Supply Current - ( A)
CC
(I
200
0
04 10
268
-55 C
-40 C
+25 C
+125 C
(VIN) Input Voltage - (V)
FIGURE 8. — LOW LEVEL OUTPUT CURRENT vs. TEMPERATUREFIGURE 7. — SUPPLY CURRENT vs. TEMPERATURE
+85 C
1300
1200
1100
1000
900
800
700
600
500
400
) Supply Current - ( A)
CC
300
(I
200
100
0
-55 -25 0 25 50 75 100 125 150
10V
5V
(TJ) Temperature - ( C)
6
80
70
60
50
40
30
20
) Low Level Outpu t Current - (mA)
OL
10
(I
0
-55 -25 0 25 50 75 100 125 150
(TJ) Temperature - ( C)
Copyright © 1999
Rev. 1.2 6/99
Page 7
PRODUCT DATABOOK 1996/1997
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
CHARACTERISTIC CURVES
LX7001
FIGURE 9. — LOW LEVEL OUTPUT VOLTAGE
vs. LOW LEVEL OUTPUT CURRENT
2000
VIN = 4V
-55 C
1500
25 C
125 C
1000
500
) Low Level Output Voltage - (mV)
OL
(V
0
0
10 20 30 40
(I
) Low Level Output Current - (mA)
SINK
FIGURE 11. — PROPAGATION DELAY
5.5
TA = 25 C
5.0
- (V)
IN
V
4.5
4.0
6.0
V
IN
5V
4V
REF
RESET
FIGURE 10. — VOLTAGE vs. CLAMP DIODE FORWARD
CURRENT
1.2
RESET = 0V
1.1
1
0.9
0.8
) Forward Voltage - (V)
0.7
F
(V
0.6
0.5
040 100
10 30 50 70 90
-40 C
25 C
20 60 80
-55 C
125 C
85 C
(IF) Forward Current - ( mA)
FIGURE 12. — LOW LEVEL OUTPUT VOLTAGE
vs. TEMPERATURE
80
10K
70
60
50
40
30
VIN = 1V
I
= 100 A
SINK
RESET - (V)
Copyright © 1999
Rev. 1.2 6/99
4.0
2.0
0
06 16
4 8 12 14
210
(t) Time - ( s)
20
) Low Level Output Vol ta g e - (mV)
OL
10
(V
0
-55 -25 0 25 50 75 100 125 150
(TJ) Temperature - ( C)
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LX7001
L
PRODUCT DATABOOK 1996/1997
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
TYPICAL APPLICATION CIRCUITS
FIGURE 13. — LOW VOLTAGE MICROPROCESSOR RESET.
V
IN
POWER
SUPPLY
1.2 V
REF
A time delayed reset can be accomplished with the addition of C
For systems with extremely fast power supply rise times (< 500ns) it
is recommended that the RC
V
is the microprocessor reset input threshold.
TH(MPU)
time constant be greater than 5.0µs.
DLY
RESET
R
C
DLY
MICROPROCESSOR
CIRCUIT
DLY
1
t
DLY
= R C
DLY
In
FIGURE 15. — VOL TAGE MONITOR. FIGURE 16. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION.
1 -
V
TH(MPU)
V
IN
FIGURE 14. — SWITCHING THE LOAD OFF WHEN
BATTERY REACHES BELOW 4.3V.
V
IN
RESET
LOAD
.
1.2 V
REF
POWER
SUPPLY
V
IN
1.2 V
V
CC
1.0k
RESET
REF
4.3V
V
IN
1.2 V
REF
270
RESET
R
L
SMP60N03-10
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.
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Copyright © 1999
Rev. 1.2 6/99
Page 9
PRODUCT DATABOOK 1996/1997
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
LX7001
TYPICAL APPLICATION CIRCUITS
FIGURE 17. — LOW VOLTAGE MICROPROCESSOR RESET
with ADDITIONAL HYSTERESIS.
R
H
I
IN
V
POWER
SUPPLY
IN
1.2 V
REF
R
L
MICROPROCESSOR
RESET
VH = + 0.02
∆V
CIRCUIT
4.6 R
R
TH (LOWER)
L
= 340 RH x 10
H
Where: RH ≤ 150Ω
RL ≥ 1.5Ω ≤ 10k Ω
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 ∆V
4.59V. The equations are accurate to ±10% with RH less than 150Ω and R
between 1.5kΩ and 10kΩ.
will be observed due to I
TH (LOWER)
which is typically 340µA at
IN
L
(Con't.)
TEST DATA
VH∆VTHR
(mV) (mV) (Ω)(Ω)
20000
51 3.4 10 1.5
40 6.8 20 4.7
81 6.8 20 1.5
71 10 30 2.7
-6
112 10 30 1.5
100 16 47 2.7
164 16 47 1.5
190 34 100 2.7
327 34 100 1.5
276 51 150 2.7
480 51 150 1.5
R
H
L
Copyright © 1999
Rev. 1.2 6/99
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.
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