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LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
T
HE
I
NFINITE
P
OWER
OF
I
N N O VAT I O N
P
RODUCTION
D
ATA
S
HEET
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 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.
K E Y F E AT U R E S
s Fully Characterized, Transient Immune Input Stage (See Product Highlight) s Monitors 5V Supplies (VTRIP=4.6V Typ.) s Outputs Fully Defined At VCC=1V s Ultra-Low Supply Current (500A Max. Over Temp) ! Temperature Compensated ICC For Extremely Stable Current Consumption ! P 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
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
A P P L I C AT I O N S
s All Microprocessor Or Microcontroller Designs Using 5V Supplies s Simple 5V Undervoltage Detection
PRODUCT HIGHLIGHT
INPUT TRANSIENT IMMUNITY
100
(tn) Noise Pulse Width - (s)
10
ACTIVE
1
IMMUNE
0.1 100
1000
(en) Noise Pulse Amplitude - (mV)
PA C K A G E O R D E R I N F O R M A T I O N TA (C) 0 to 70 -40 to 85 -55 to 125
DM Plastic SOIC 8-pin
LX7001CDM LX7001IDM --
LP Plastic TO-92 3-pin
LX7001CLP LX7001ILP --
Y Ceramic Dip 8-pin
-- -- LX7001MY
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX7001CDMT)
Copyright (c) 1999 Rev. 1.2 6/99
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
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 VIN N.C. GROUND
1 2 3 4 8 7 6 5
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) .......................................................................................... 150C Plastic (DM, LP - Packages) .................................................................................. 150C Storage Temperature Range ...................................................................... -65C to 150C Lead Temperature (Soldering, 10 seconds) ............................................................. 300C
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.
N.C. N.C. N.C. N.C.
Y PACKAGE (Top View)
RESET VIN N.C. GROUND
1 2 3 4
8 7 6 5
N.C. N.C. N.C. N.C.
T H E R M A L D ATA
DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA LP PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA Y PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 130C/W 156C/W 165C/W
DM PACKAGE (Top View)
3. GROUND 2. VIN 1. RESET
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
LP PACKAGE (Top View)
2
Copyright (c) 1999 Rev. 1.2 6/99
PRODUCT DATABOOK 1996/1997
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
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
Input Supply Voltage RESET Output Voltage Clamp Diode Forward Current Operating Ambient Temperature Range: LX7001C LX7001I LX7001M Note 2. Range over which the device is functional.
(Note 2)
Symbol
VIN VOUT IF
Recommended Operating Conditions Min. Typ. Max.
1 10 50mA 0 -25 -55 70 85 125 10
Units
V V
C C C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0C TA 70C for the LX7001C, -40C TA 85C for the LX7001I, and -55C TA 125C 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
VT+ VTVH
VIN Increasing -- 4V to 5V VIN 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 A A V A
RESET Output Section
Output Sink Saturation Voltage VOL Output Sink Current Output Off-State Leakage Clamp Diode Forward Voltage IOL IOH VF ICC 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 VIN = 5.0V
10
0.6
Total Device
Supply Current
Copyright (c) 1999 Rev. 1.2 6/99
3
PRODUCT DATABOOK 1996/1997
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
BLOCK DIAGRAM
VIN
RESET
1.2 VREF
GROUND
GRAPH / CURVE INDEX
FIGURE 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 THRESHOLD HYSTERESIS vs. TEMPERATURE SUPPLY CURRENT vs. INPUT VOLTAGE SUPPLY CURRENT vs. TEMPERATURE LOW LEVEL OUTPUT CURRENT vs. TEMPERATURE LOW LEVEL OUTPUT VOLTAGE vs. LOW LEVEL OUTPUT CURRENT FIGURE #
Application Circuits
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
10. VOLTAGE vs. CLAMP DIODE FORWARD CURRENT 11. PROPAGATION DELAY 12. LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE
4
Copyright (c) 1999 Rev. 1.2 6/99
PRODUCT DATABOOK 1996/1997
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 1. -- RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
10
FIGURE 2. -- POWER-UP RESET VOLTAGE
2.0
RL = 10K
(VOUT) RESET Output Voltage - (V)
Power-Up RESET Voltage - (V)
TA = 25 C
8
1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2
VIN
6
4
RESET
2
0 0 2 4 6 8 10
0 0 100 200 300 400 500
(VIN) Input Voltage - (V)
(t) Time - ( s)
FIGURE 3. -- RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
5
FIGURE 4. -- THRESHOLD VOLTAGE vs. TEMPERATURE
4.64
(VOUT) RESET Output Voltage - (V)
VT+ Upper Threshold High State Output
(VT) Threshold Voltage - (V)
4
4.62
3
4.60
VT- Lower Threshold Low State Output
4.58
2
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
(VIN) Input Voltage - (V)
(TJ) Temperature - ( C)
Copyright (c) 1999 Rev. 1.2 6/99
5
PRODUCT DATABOOK 1996/1997
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 5. -- THRESHOLD HYSTERESIS vs. TEMPERATURE
30
FIGURE 6. -- SUPPLY CURRENT vs. INPUT VOLTAGE
1000
RESET Load = 10K
(VH) Hysteresis Voltage - (mV)
-55 C
(ICC) Supply Current - ( A)
26
800
-40 C +25 C
22
600
18
400 +85 C +125 C 200
14
10 -55
0 -25 0 25 50 75 100 125 150 0 2 4 6 8 10
(TJ) Temperature - ( C)
(VIN) Input Voltage - (V)
FIGURE 7. -- SUPPLY CURRENT vs. TEMPERATURE
FIGURE 8. -- LOW LEVEL OUTPUT CURRENT vs. TEMPERATURE
80
1300 1200 1100
(IOL) Low Level Output Current - (mA)
70 60 50 40 30 20 10 0 -55
(ICC) Supply Current - ( A)
1000 900 800 700 600 500 400 300 200 100 0 -55 -25 0 25 50 75 100 125 150
10V
5V
-25
0
25
50
75
100
125
150
(TJ) Temperature - ( C)
(TJ) Temperature - ( C)
6
Copyright (c) 1999 Rev. 1.2 6/99
PRODUCT DATABOOK 1996/1997
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 9. -- LOW LEVEL OUTPUT VOLTAGE vs. LOW LEVEL OUTPUT CURRENT
2000
FIGURE 10. -- VOLTAGE vs. CLAMP DIODE FORWARD CURRENT
1.2
(VOL) Low Level Output Voltage - (mV)
VIN = 4V
-55 C 1500 25 C 125 C 1000
RESET = 0V
1.1 -40 C
-55 C
(VF) Forward Voltage - (V)
1
0.9
0.8 125 C 0.7 25 C 0.6 85 C
500
0 0 10 20 30 40
0.5 0 10 20 30 40 50 60 70 80 90 100
(ISINK) Low Level Output Current - (mA)
(IF) Forward Current - (mA)
FIGURE 11. -- PROPAGATION DELAY
5.5
FIGURE 12. -- LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE
80
10K
(VOL) Low Level Output Voltage - (mV)
TA = 25 C
VIN 5V 4V
VIN - (V)
5.0 4.5
RESET
70 60 50 40 30 20 10 0 -55
VIN = 1V ISINK = 100 A
REF
4.0
6.0
RESET - (V)
4.0 2.0
0 0 2 4 6 8 10 12 14 16
-25
0
25
50
75
100
125
150
(t) Time - ( s)
(TJ) Temperature - ( C)
Copyright (c) 1999 Rev. 1.2 6/99
7
PRODUCT DATABOOK 1996/1997
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
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 13. -- LOW VOLTAGE MICROPROCESSOR RESET. FIGURE 14. -- SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V.
VIN RESET POWER SUPPLY
R MICROPROCESSOR CIRCUIT
CDLY
VIN
1.2 VREF
LOAD
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 5.0s. VTH(MPU) is the microprocessor reset input threshold.
1.2 VREF
tDLY = R CDLY In
1 VTH(MPU) 1VIN
FIGURE 15. -- VOLTAGE MONITOR.
FIGURE 16. -- MOSFET LOW VOLTAGE GATE DRIVE PROTECTION.
VCC
1.0k VIN POWER SUPPLY
4.3V VIN
270
RL SMP60N03-10L RESET
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 (c) 1999 Rev. 1.2 6/99
PRODUCT DATABOOK 1996/1997
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
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 IIN VIN RL RESET MICROPROCESSOR CIRCUIT
POWER SUPPLY
VH =
1.2 VREF
4.6 RH + 0.02 RL
VTH (LOWER) = 340 RH x 10-6 Where: RH 150 RL 1.5 10k
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 340A at 4.59V. The equations are accurate to 10% with RH less than 150 and RL between 1.5k and 10k.
VH (mV) 20 51 40 81 71 112 100 164 190 327 276 480
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
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 (c) 1999 Rev. 1.2 6/99
9

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