MC33064/MC34064
U
NDERVOLTAGE SENSING CIRCUIT
T HE I NFINITE P OWER OF I NNOVATION
DESCRIPTION
The MC34064 is an undervoltage
sensing circuit designed specifically for
use as a reset controller in microprocessor-based systems. It offers the designer
an economical, space-efficient solution
for low supply voltage detection when
used in combination with a single pullup resistor. Adding one capacitor offers
the functionality of a programmable
delay time after power returns. The
34064 consists of a temperature stable
reference comparator with hysteresis,
collector output stage capable of
sinking up to 60mA. The MC34064's
RESET output is specified to be fully
functional at V
ment over competing products is the
=1V. A major improve-
IN
glitch-free supply current during
undervoltage detection. Competing
products demand a step function
increase in operating current during the
time that you least want or need it....
during power loss. See Product
Highlight below.
high-current clamping diode and open
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
SUPPLY CURRENT VS. INPUT VOLTAGE
400
385
RL = No Load
370
P RODUCTION DATA SHEET
KEY FEATURES
■ Monitors 5V Supplies (VT = 4.6V Typ.)
■ Outputs Fully Defined At V
Figure 1)
■ Glitch-Free Supply Current During
Switching (See Product Highlight)
! Ultra-Low Supply Current (500µA Max.)
! 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
■■
IN
= 1V (See
355
340
325
310
295
) Supply Current - ( A)
CC
(I
280
265
250
ACTIVE
REGION
-8 -4 -2
-10 -6 0
Input Voltage less Threshold Voltage - (mV)
MONITOR
REGION
SWITCHING REGION
246810
PACKAGE ORDER INFORMATION
T
(°C)
A
Plastic SOIC
DM
8-pin
Plastic TO-92
LP
3-pin
0 to 70 MC34064DM MC34064LP
-40 to 85 MC33064DM MC33064LP
-55 to 125 — —
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. MC34064DMT)
Copyright © 1999
Rev. 1.3 6/99
L INF INITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN) ............................................................................... -1V to 10V
RESET Output Voltage (V
Output Sink Current (I
Clamp Diode Forward Current (IF), Pin 1 to pin 2............................................... 100mA
) ..................................................................................... 10V
OUT
) ............................................................ Internally Limited (mA)
OL
Operating Junction Temperature
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,
θθ
θ
θθ
JA
165°C/W
LP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θθ
θ
θθ
JA
156°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
BLOCK DIAGRAM
V
IN
PACKAGE PIN OUTS
RESET
V
N.C.
GROUND
18
27
IN
36
45
DM PACKAGE
(Top View)
3. GROUND
2. V
1. RESET
LP PACKAGE
(Top View)
N.C.
N.C.
N.C.
N.C.
IN
1.2 V
REF
GROUND
RESET
2
Copyright © 1999
Rev. 1.3 6/99
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
U
NDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
RECOMMENDED OPERATING CONDITIONS (Note 2)
Parameter
Symbol
Input Supply Voltage V
RESET Output Voltage V
Clamp Diode Forward Current I
IN
OUT
F
Recommended Operating Conditions
Min. Typ. Max.
1 6.5 V
6.5 V
50mA
Units
Operating Ambient Temperature Range:
MC34064 T
MC33064 T
A
A
070°C
-40 85 °C
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 MC34064 and -40°C ≤ TA ≤ 85°C
for the MC33064. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Symbol
Test Conditions Units
MC34064/MC33064
Min. Typ. Max.
Comparator Section
Threshold Voltage
High State Output V
Low State Output V
Hysteresis V
Increasing — 4V to 5V
T+VIN
VIN Decreasing — 5V to 4V
T-
H
4.5 4.61 4.7 V
4.5 4.59 4.7 V
0.01 0.02 0.05 V
RESET Output Section
Output Low Level Saturation Voltage VIN = 4.0V, IOL = 8.0mA
V
OLVIN
= 4.0V, IOL = 2.0mA
VIN = 1.0V, IOL = 0.1mA
Output Low Level Current I
Output Off-State Leakage I
VIN = V
VIN = V
OUT
OUT
= 4.0V
= 5.0V
OL
OH
Clamp Diode Forward Voltage VFPin 1 to pin 2, IF = 10mA
10 27 60 mA
0.02 0.5 µA
0.6 0.9 1.2 V
1.0 V
0.4 V
0.1 V
Total Device
Supply Current I
CC
VIN = 5.0V
390 500 µA
Copyright © 1999
Rev. 1.3 6/99
3
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
GRAPH / CURVE INDEX
Characteristic Curves
FIGURE #
1. INPUT VOLTAGE and RESET OUTPUT VOLTAGE vs. TIME
2. POWER-UP RESET VOLTAGE
3. POWER-DOWN RESET VOLTAGE
4. RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
5. THRESHOLD VOLTAGE vs. TEMPERATURE
6. THRESHOLD HYSTERESIS vs. TEMPERATURE
7. SUPPLY CURRENT vs. INPUT VOLTAGE
8. SUPPLY CURRENT vs. TEMPERATURE
9. LOW LEVEL OUTPUT CURRENT vs TEMPERATURE
10. LOW LEVEL OUTPUT SATURATION VOLTAGE vs. TEMPERATURE
11. LOW LEVEL OUTPUT SATURATION VOLTAGE vs. TEMPERATURE
12. CLAMP DIODE FORWARD VOLT AGE vs. FORWARD CURRENT
13. PROPAGA TION DELA Y — HIGH to LOW
14. PROPAGA TION DELA Y — LOW to HIGH
FIGURE INDEX
Application Circuits
FIGURE #
15. LOW VOLTAGE MICROPROCESSOR RESET
16. SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V
17. VOLTAGE MONITOR
18. MOSFET LOW VOLTAGE GATE DRIVE PROTECTION
19. LOW VOLTAGE MICROPROCESSOR RESET with ADDITIONAL
HYSTERESIS
20. SOLAR POWERED BATTERY CHARGER
4
Copyright © 1999
Rev. 1.3 6/99
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
U
NDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 1. — INPUT VOLTAGE and RESET OUTPUT
FIGURE 2. — POWER-UP RESET VOLTAGE
VOLTAGE vs. TIME
20
RL = 10k
15
T
= 25 C
A
5
0
5
0
0.4 1.0
.2 .6 .8
RESET - (V )
- (V)
IN
V
10
20
15
10
(t) Time - (ms)
1.2 1.4 1.6 1.8 2.0
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
RL = 10kohms
= 25 C
T
A
V
IN
RESET
0.4
Power-Up RESET Voltage - (V)
0.2
0
00.8 2.0
0.4 1.2 1.6
(t) Time - (ms)
FIGURE 3. — POWER-DOWN RESET VOLTAGE FIGURE 4. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
Power-D own RESET Voltag e - (V)
Copyright © 1999
Rev. 1.3 6/99
2.0
RL = 10kohms
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
= 25 C
T
A
V
IN
RESET
0.2
0
00.8 2.0
0.4 1.2 1.6
(t) Time - (ms)
) RESET Output Voltage - (V)
(V
OUT
5
RL = 10kohms
= 25 C
T
A
4
3
2
1
0
4.58
4.59 4.60 4.61 4.62
(VIN) Input Voltage - (V)
5
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 5. — THRESHOLD VOLTAGE vs. TEMPERATURE
4.7
VT+ ; VIN increasing 4.5 - 4.7
4.68
V
; V
decreasing 4.7 - 4.5
T-
IN
R
= 10kohms
L
VT+ - High Threshold Voltage
4.6
VT- - Low Threshold Voltage
4.5
-55 -25 0 25 50 75 100 125 150
) Threshold Volta g e - (V)
T
(V
4.66
4.64
4.62
4.58
4.56
4.54
4.52
(TJ) Temperature - ( C)
FIGURE 7. — SUPPLY CURRENT vs. INPUT VOLTAGE
FIGURE 6. — THRESHOLD HYSTERESIS vs. TEMPERATURE
50
46
42
38
34
30
26
22
) Threshold Hyst eresis - (mV)
H
18
(V
14
10
-55
-25 0 25 50 75 100 125 150
(TJ) Temperature - ( C)
FIGURE 8. — SUPPLY CURRENT vs. TEMPERATURE
1000
RL = No Load
= 25 C
T
A
800
600
400
) Supply Current - ( A)
CC
(I
200
0
04 10
268
(VIN) Input Voltage - (V)
6
1000
RL = No Load
900
800
700
600
500
400
300
) Supply Current - ( A)
CC
(I
200
100
0
-55
-25 0 25 50 75 100 125 150
VIN = 10V
VIN = 5V
(TJ) Temperature - ( C)
Copyright © 1999
Rev. 1.3 6/99
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
U
NDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 9. — LOW LEVEL OUTPUT CURRENT
vs. TEMPERATURE
50
45
40
35
VIN = V
= 4V
30
25
20
15
10
) Low Level Output Current - (mA)
OL
(I
5
0
-55
-25 0 25 50 75 100 125 150
OUT
VIN = V
OUT
= 1V
(TJ) Temperature - ( C)
FIGURE 11. — LOW LEVEL OUTPUT SATURATION VOLTAGE
vs. TEMPERATURE
100
VIN = 1V
90
I
= 100 A
OL
80
70
FIGURE 10. — LOW LEVEL OUTPUT SATURATION VOLTAGE
vs. TEMPERATURE
400
) Low Level Output Saturation Voltage - (mV)
(V
360
320
280
240
200
160
120
80
40
OL
VIN = 4V
IOL = 8mA
IOL = 2mA
0
-55
-25 0 25 50 75 100 125 150
(TJ) Temperature - ( C)
FIGURE 12. — CLAMP DIODE FORWARD VOLTAGE
vs. FORWARD CURRENT
1.2
RESET = 0V
1.1
1
-40 C
) Low Level Output Saturation V o ltage - (mV)
OL
(V
Copyright © 1999
Rev. 1.3 6/99
60
50
40
30
20
10
0
-55
-25 0 25 50 75 100 125 150
(TJ) Temperature - ( C)
0.9
25 C
0.8
85 C
0.7
0.6
) Clamp Diode Forward Voltage - (V)
F
(V
0.5
040 100
20 60 80
10 30 50 70 90
(IF) Forward Current - (mA)
7
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 13. — PROPAGATION DELAY — HIGH to LOW
- (V)
IN
V
RESET - (V)
-1.0
5.5
TA = 25 C
5.0
4.5
4.0
5.0
3.0
1.0
0
0150 400
100 200 300 350
50 250
V
IN
5V
4V
REF
RESET
(t) Time - (ns)
10K
FIGURE 14. — PROPAGATION DELAY — LOW to HIGH
5.5
TA = 25 C
5.0
- (V)
IN
V
4.5
4.0
5.0
V
IN
5V
3.0
RESET - (V)
1.0
0
-1.0
01.5 4.0
1.0 2.0 3.0 3.5
.5 2.5
4V
REF
RESET
(t) Time - ( s)
10K
8
Copyright © 1999
Rev. 1.3 6/99
PRODUCT DATABOOK 1996/1997
L
MC33064/MC34064
U
NDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
TYPICAL APPLICATION CIRCUITS
FIGURE 15. — 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 17. — VOLTAGE MONITOR FIGURE 18. — MOSFET LOW VOLTAGE GA TE DRIVE PROTECTION
1 -
V
TH(MPU)
V
IN
FIGURE 16. — SWITCHING THE LOAD OFF WHEN
BATTERY REACHES BELOW 4.3V
V
IN
RESET
.
1.2 V
REF
LOAD
POWER
SUPPLY
V
CC
1.0k
V
IN
4.3V
V
IN
270
RESET
R
L
SMP60N03-10
RESET
1.2 V
REF
1.2 V
REF
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 4.6 volt threshold of the MC34064, its output grounds the gate
of the L2 MOSFET.
Copyright © 1999
Rev. 1.3 6/99
9
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P RODUCTION DATA SHEET
TYPICAL APPLICATION CIRCUITS
FIGURE 19. — 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
TH (LOWER)
CIRCUIT
4.6 R
H
R
L
= 340 RH x 10
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 ∆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
(Cont'd.)
TEST DATA
VH∆V
(mV) (mV) (Ω)(Ω)
20000
513.4101.5
406.8204.7
816.8201.5
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
THRH
R
L
FIGURE 20. — SOLAR POWERED BATTERY CHARGER
V
IN
RESET
1.2 V
REF
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.
SOLAR
CELLS
10
Copyright © 1999
Rev. 1.3 6/99
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