LX7001ILP [MICROSEMI]
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT; 瞬态免疫欠压检测电路
| 型号： | LX7001ILP |
| 厂家： | 
Microsemi |
| 描述： | TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT |
| 文件： | 总9页 (文件大小：139K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
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
D E S C R I P T I O N
K E Y F E A T U R E S
Fully Characterized, Transient Immune
The LX7001 is an improved
economical, space-efficient solution
for low supply voltage detection
Input Stage
(See Product Highlight)
undervoltage sensing circuit specifi-
cally 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 overcom-
ing 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
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
Monitors 5V Supplies (VTRIP=4.6V Typ.)
Outputs Fully Defined At V =1V
CC
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
consist of a comparator with hyster-
esis, high current clamping diode and
open collector output stage capable
of sinking up to 60mA. The
Oscillation
! Electrically Compatible With Motorola
immunity with a micropower, ultra-
stable band-gap reference for preci-
sion sensing of undervoltage condi-
tions. It offers the designer an
MC34064
! Pin-to-Pin Compatible With Motorola
LX7001's RESET output is specified to
MC34064/MC34164
be fully functional at V =1V.
IN
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
A P P L I C A T I O N S
P R O D U C T H I G H L I G H T
All Microprocessor Or Microcontroller
Designs Using 5V Supplies
INPUT TRANSIENT IMMUNITY
Simple 5V Undervoltage Detection
100
ACTIVE
10
IMMUNE
1
0.1
100
1000
(en) Noise Pulse Amplitude - (mV)
P A C K A G E O R D E R I N F O R M A T I O N
Plastic SOIC
8-pin
Plastic TO-92
3-pin
Ceramic Dip
T (°C)
DM
LP
Y
8-pin
A
0 to 70
-40 to 85
-55 to 125
LX7001CDM
LX7001IDM
—
LX7001CLP
LX7001ILP
—
—
—
LX7001MY
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX7001CDMT)
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
Copyright © 1999
Rev. 1.2 6/ 99
1
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
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 A T I N G S
(Note 1 )
P A C K A G E P I N O U T S
Input Supply Voltage (V ) ............................................................................... -1V to 12V
IN
1
2
3
4
8
7
6
5
RESET
N.C.
N.C.
N.C.
N.C.
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
V
IN
N.C.
GROUND
Y PACKAGE
(Top View)
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
1
2
3
4
8
7
6
5
N.C.
RESET
N.C.
N.C.
N.C.
V
IN
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.
GROUND
DM PACKAGE
(Top View)
T H E R M A L D A TA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
LP PACKAGE:
165°C/W
156°C/W
130°C/W
3. GROUND
2.
1. RESET
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
Y PACKAGE:
V
IN
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
LP PACKAGE
(Top View)
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
Copyright © 1999
Rev. 1.2 6/ 99
2
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
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 A T I N G C O N D I T I O N S
(Note 2)
Recommended Operating Conditions
Parameter
Symbol
Units
Min.
Typ.
Max.
Input Supply Voltage
RESET Output Voltage
V
1
10
V
V
IN
V
10
OUT
Clamp Diode Forward Current
I
50mA
F
Operating Ambient Temperature Range:
LX7001C
LX7001I
LX7001M
0
70
85
°C
°C
°C
-25
-55
125
Note 2. Range over which the device is functional.
ELECTR I CA L CH A R A CTER I S TI CS
(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.)
LX7001C/7001I/7001M
Parameter
Symbol
Test Conditions
Units
Min. Typ.
Max.
Comparator Section
Threshold Voltage
High State Output
Low State Output
Hysteresis
V
V Increasing — 4V to 5V
4.5
4.5
4.62
4.60
0.02
4.7
4.7
V
V
V
T+
IN
V
V Decreasing — 5V to 4V
T-
IN
V
0.01
0.05
H
RESET Output Section
Output Sink Saturation Voltage
V = 4.0V, IOL = 8.0mA
0.06
0.25
0.3
1.0
0.4
0.1
60
V
V
IN
V
V = 4.0V, IOL = 2.0mA
OL
IN
V = 1.0V, IOL = 0.1mA
V
IN
Output Sink Current
IOL
IOH
V
OUT = 4.0V
OUT = 5.0V
OUT = 10V
10
40
mA
µA
µA
V
Output Off-State Leakage
V
0.01
0.02
0.82
0.5
2.0
1.2
V
Clamp Diode Forward Voltage
Total Device
V
Pin 1 to pin 2, I = 10mA
0.6
F
F
Supply Current
ICC
V = 5.0V
345
500
µA
IN
Copyright © 1999
Rev. 1.2 6/ 99
3
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P R O D U C T I O N D A T A S H E E T
B LO CK D I A G R A M
V
IN
RESET
1.2 VREF
GROUND
G RAP H / CURVE INDEX
FIG URE IN DEX
Characteristic Curves
Application Circuits
FIGURE #
FIGURE #
1. RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
2. POWER-UP RESET VOLTAGE
13. LOW VOLTAGE MICROPROCESSOR RESET
14. SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V
15. VOLTAGE MONITOR
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
16. MOSFET LOW VOLTAGE GATE DRIVE PROTECTION
17. LOW VOLTAGE MICROPROCESSOR RESET with ADDITIONAL
HYSTERESIS
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
Copyright © 1999
Rev. 1.2 6/ 99
4
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P R O D U C T I O N D A T A S H E E T
C H A R A C T E R I S T I C C U R V E S
FIGURE 1. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
FIGURE 2. — POWER-UP RESET VOLTAGE
10
8
2.0
1.8
1.6
1.4
1.2
1.0
R = 10K
L
T = 25 C
A
V
IN
6
4
0.8
0.6
0.4
RESET
2
0.2
0
0
0
100
200
300
400
500
0
2
4
6
8
10
(t) Time - ( s)
(V ) Input Voltage - (V)
IN
FIGURE 3. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
FIGURE 4. — THRESHOLD VOLTAGE vs. TEMPERATURE
4.64
5
Upper Threshold
VT+
High State Output
4.62
4
3
2
1
4.60
Lower Threshold
VT-
Low State Output
4.58
4.56
4.54
0
-55
-25
0
25
50
75
100
125
150
4.55 4.56 4.57 4.58 4.59 4.60 4.61 4.62 4.63 4.64 4.65
(T ) Temperature - ( C)
(V ) Input Voltage - (V)
J
IN
Copyright © 1999
Rev. 1.2 6/ 99
5
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P R O D U C T I O N D A T A S H E E T
C H A R A C T E R I S T I C C U R V E S
FIGURE 6. — SUPPLY CURRENT vs. INPUT VOLTAGE
FIGURE 5. — THRESHOLD HYSTERESIS vs. TEMPERATURE
30
26
22
18
14
10
1000
800
600
400
200
0
RESET Load = 10K
-55 C
-40 C
+25 C
+85 C
+125 C
-55
-25
0
25
50
75
100
125
150
0
2
4
6
8
10
(T ) Temperature - ( C)
(V ) Input Voltage - (V)
IN
J
FIGURE 7. — SUPPLY CURRENT vs. TEMPERATURE
FIGURE 8. — LOW LEVEL OUTPUT CURRENT vs. TEMPERATURE
80
70
60
50
40
30
20
10
0
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
10V
5V
-55
-25
0
25
50
75
100
125
150
-55
-25
0
25
50
75
100
125
150
(T ) Temperature - ( C)
(T ) Temperature - ( C)
J
J
Copyright © 1999
Rev. 1.2 6/ 99
6
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P R O D U C T I O N D A T A S H E E T
C H A R A C T E R I S T I C C U R V E S
FIGURE 10. — VOLTAGE vs. CLAMP DIODE FORWARD
FIGURE 9. — LOW LEVEL OUTPUT VOLTAGE
vs. LOW LEVEL OUTPUT CURRENT
CURRENT
2000
1500
1000
500
0
1.2
-55 C
RESET = 0V
V
= 4V
IN
1.1
1
-40 C
-55 C
25 C
0.9
0.8
125 C
125 C
85 C
0.7
0.6
25 C
0.5
0
10
20
30
40
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
FIGURE 12. — LOW LEVEL OUTPUT VOLTAGE
vs. TEMPERATURE
5.5
80
V
IN
10K
RESET
T = 25 C
5V
4V
A
V
= 1V
IN
70
60
50
40
30
20
10
0
5.0
4.5
ISINK = 100 A
REF
4.0
6.0
4.0
2.0
0
-55
-25
0
25
50
75
100
125
150
0
2
4
6
8
10
12
14
16
(T ) Temperature - ( C)
(t) Time - ( s)
J
Copyright © 1999
Rev. 1.2 6/ 99
7
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
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 A T 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.
V
IN
R
RESET
MICROPROCESSOR
CIRCUIT
POWER
SUPPLY
CDLY
V
LOAD
IN
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.
1.2 VREF
1
VTH(MPU)
tDLY = R CDLY In
1 -
V
IN
FIGURE 15. — VOLTAGE MONITOR.
FIGURE 16. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION.
VCC
R
1.0k
270
L
4.3V
SMP60N03-10L
V
IN
V
IN
RESET
POWER
SUPPLY
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
2
of the L MOSFET.
Copyright © 1999
Rev. 1.2 6/ 99
8
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX7001
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
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 A T 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
V
VH
∆VTH
RH
R
L
I
(mV) (mV) (Ω)
(Ω)
IN
IN
R
L
20
51
40
81
71
112
100
164
190
327
276
480
0
0
0
MICROPROCESSOR
CIRCUIT
3.4
6.8
6.8
10
10
16
16
34
34
51
51
10
20
20
30
30
47
47
1.5
4.7
1.5
2.7
1.5
2.7
1.5
POWER
SUPPLY
RESET
4.6 RH
VH =
+ 0.02
R
L
∆VTH (LOWER) = 340 RH x 10-6
1.2 VREF
Where: RH ≤ 150Ω
100 2.7
100 1.5
150 2.7
150 1.5
R ≥ 1.5Ω ≤ 10kΩ
L
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 150Ω and RL
between 1.5kΩ and 10kΩ.
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. 1.2 6/ 99
9
相关型号：
LX7001ILP-TR
Power Supply Support Circuit, Adjustable, 1 Channel, PBCY3, ROHS COMPLIANT, PLASTIC, TO-92, 3 PIN
MICROSEMI
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