Microsemi LX7001ILP Transient immune undervoltage sensing circuit Datasheet

LX7001
T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT
T
H E
I
P
N F I N I T E
O W E R
I
O F
P
N N O VA T I O N
R O D U C T I O N
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
D
A T A
S
H E E T
K E Y F E AT U R E S
■ Fully Characterized, Transient Immune
Input Stage
(See Product Highlight)
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.
■ 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
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
PRODUCT HIGHLIGHT
■ All Microprocessor Or Microcontroller
Designs Using 5V Supplies
INPUT TRANSIENT IMMUNITY
■ Simple 5V Undervoltage Detection
(tn) Noise Pulse Width - (µs)
100
ACTIVE
10
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
SOIC
DM Plastic
8-pin
TA (°C)
TO-92
LP Plastic
3-pin
Dip
Y Ceramic
8-pin
0 to 70
LX7001CDM
LX7001CLP
—
-40 to 85
LX7001IDM
LX7001ILP
—
—
—
LX7001MY
-55 to 125
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX7001CDMT)
Copyright © 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
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)
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
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.
PA C K A G E P I N O U T S
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)
RESET
VIN
N.C.
GROUND
1
8
2
7
3
6
4
5
N.C.
N.C.
N.C.
N.C.
DM PACKAGE
(Top View)
T H E R M A L D ATA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
165°C/W
LP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
3. GROUND
156°C/W
Y PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
1. RESET
130°C/W
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
2
2. VIN
LP PACKAGE
(Top View)
Copyright © 1999
Rev. 1.2 6/99
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
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
Supply Current
Copyright © 1999
Rev. 1.2 6/99
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
RESET
1.2 VREF
GROUND
GRAPH / CURVE INDEX
FIGURE INDEX
Characteristic Curves
Application Circuits
FIGURE #
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
12. LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE
4
Copyright © 1999
Rev. 1.2 6/99
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
TA = 25 C
Power-Up RESET Voltage - (V)
(VOUT) RESET Output Voltage - (V)
S
A T A
8
6
4
2
1.6
1.4
VIN
1.2
1.0
0.8
0.6
RESET
0.4
0.2
0
0
0
2
4
6
8
100
0
10
4.64
VT+ Upper Threshold
High State Output
4
(VT) Threshold Voltage - (V)
(VOUT) RESET Output Voltage - (V)
500
FIGURE 4. — THRESHOLD VOLTAGE vs. TEMPERATURE
5
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)
Copyright © 1999
Rev. 1.2 6/99
400
(t) Time - ( s)
(VIN) Input Voltage - (V)
FIGURE 3. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
300
200
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
26
(ICC) Supply Current - ( A)
(VH) Hysteresis Voltage - (mV)
RESET Load = 10K
22
18
14
10
-55
800
-40 C
+25 C
600
400
+85 C
+125 C
200
0
-25
0
25
50
75
100
125
2
0
150
(TJ) Temperature - ( C)
8
10
(VIN) Input Voltage - (V)
FIGURE 7. — SUPPLY CURRENT vs. TEMPERATURE
FIGURE 8. — LOW LEVEL OUTPUT CURRENT vs. TEMPERATURE
80
1200
1100
1000
900
800
700
600
10V
500
400
300
5V
200
(IOL) Low Level Output Current - (mA)
1300
(ICC) Supply Current - ( A)
6
4
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. 1.2 6/99
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
1.2
2000
1.1
-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)
VIN - (V)
4V
RESET
REF
4.5
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. 1.2 6/99
-55 C
RESET = 0V
VIN = 4V
(VF) Forward Voltage - (V)
(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
CDLY
MICROPROCESSOR
CIRCUIT
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.
VCC
1.0k
VIN
RL
270
4.3V
SMP60N03-10L
VIN
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
of the L2 MOSFET.
8
Copyright © 1999
Rev. 1.2 6/99
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
IIN
VIN
POWER
SUPPLY
RL
RESET
MICROPROCESSOR
CIRCUIT
VH =
1.2 VREF
4.6 RH
+ 0.02
RL
∆VTH (LOWER) = 340 RH x 10-6
Where: RH ≤ 150Ω
RL ≥ 1.5Ω ≤ 10kΩ
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.
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
(Ω)
0
10
20
20
30
30
47
47
100
100
150
150
RL
(Ω)
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 © 1999
Rev. 1.2 6/99
9
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