MC33064/MC34064
U
N D E RV O LTA G E
S
E N S I N G
C
I R C U I T
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
The MC34064 is an undervoltage
sensing circuit designed specifically for
use as a reset controller in microproces-
sor-based systems. 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. The
34064 consists of a temperature stable
reference comparator with hysteresis,
high-current clamping diode and open
collector output stage capable of
sinking up to 60mA. The MC34064's
RESET output is specified to be fully
functional at V
IN
=1V. A major improve-
ment over competing products is the
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.
K E Y F E AT U R E S
s
Monitors 5V Supplies
(V
T
= 4.6V Typ.)
s
Outputs Fully Defined At V
IN
= 1V
(See
Figure 1)
s
Glitch-Free Supply Current During
Switching
(See Product Highlight)
!
Ultra-Low Supply Current (500µA Max.)
!
Temperature Compensated I
CC
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.
PRODUCT HIGHLIGHT
S
U P P LY
C
U R R E N T
400
385
370
355
340
325
310
295
280
265
250
-10
VS
.
I
N P U T
V
O L TA G E
APPLICATIONS
s
All Microprocessor Or Microcontroller
Designs Using 5V Supplies
R
L
= No Load
SWITCHING REGION
s
Simple 5V Undervoltage Detection
(I
CC
) Supply Current - ( A)
ACTIVE
REGION
MONITOR
REGION
-8
-6
-4
-2
0
2
4
6
8
10
Input Voltage less Threshold Voltage - (mV)
PA C K A G E O R D E R I N F O R M A T I O N
T
A
(°C)
0 to 70
-40 to 85
-55 to 125
DM
Plastic SOIC
8-pin
MC34064DM
MC33064DM
—
LP
Plastic TO-92
3-pin
MC34064LP
MC33064LP
—
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
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
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
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE PIN OUTS
RESET
V
IN
N.C.
GROUND
1
2
3
4
8
7
6
5
Input Supply Voltage (V
IN
) ............................................................................... -1V to 10V
RESET Output Voltage (V
OUT
) ..................................................................................... 10V
Output Sink Current (I
OL
) ............................................................ Internally Limited (mA)
Clamp Diode Forward Current (I
F
), Pin 1 to pin 2 ............................................... 100mA
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.
N.C.
N.C.
N.C.
N.C.
DM PACKAGE
(Top View)
3.
GROUND
2.
V
IN
1.
RESET
THERMAL DATA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
LP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
156°C/W
165°C/W
LP PACKAGE
(Top View)
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow
B LOCK D IAGR AM
V
IN
RESET
1.2 V
REF
GROUND
2
Copyright © 1999
Rev. 1.3 6/99
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
U
N D E RV O LTA G E
S
E N S I N G
C
I R C U I T
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 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:
MC34064
MC33064
Note 2. Range over which the device is functional.
(Note 2)
Symbol
V
IN
V
OUT
I
F
T
A
T
A
Recommended Operating Conditions
Min.
Typ.
Max.
1
6.5
50mA
0
-40
70
85
6.5
Units
V
V
°C
°C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0°C
≤
T
A
≤
70°C for the MC34064 and -40°C
≤
T
A
≤
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
Comparator Section
Threshold Voltage
High State Output
Low State Output
Hysteresis
Symbol
Test Conditions
MC34064/MC33064
Min. Typ.
Max.
Units
V
T+
V
T-
V
H
V
IN
Increasing — 4V to 5V
V
IN
Decreasing — 5V to 4V
4.5
4.5
0.01
4.61
4.59
0.02
4.7
4.7
0.05
1.0
0.4
0.1
60
0.5
1.2
500
V
V
V
V
V
V
mA
µA
V
µA
RESET
Output Section
Output Low Level Saturation Voltage
V
OL
Output Low Level Current
Output Off-State Leakage
Clamp Diode Forward Voltage
I
OL
I
OH
V
F
I
CC
V
IN
= 4.0V, I
OL
= 8.0mA
V
IN
= 4.0V, I
OL
= 2.0mA
V
IN
= 1.0V, I
OL
= 0.1mA
V
IN
= V
OUT
= 4.0V
V
IN
= V
OUT
= 5.0V
Pin 1 to pin 2, I
F
= 10mA
V
IN
= 5.0V
10
0.6
27
0.02
0.9
390
Total Device
Supply Current
Copyright © 1999
Rev. 1.3 6/99
3
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
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
GRAPH / CURVE INDEX
FIGURE INDEX
Characteristic Curves
FIGURE #
1.
2.
3.
4.
5.
6.
7.
8.
9.
INPUT VOLTAGE and RESET OUTPUT VOLTAGE vs. TIME
POWER-UP RESET VOLTAGE
POWER-DOWN 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
FIGURE #
Application Circuits
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
10.
LOW LEVEL OUTPUT SATURATION VOLTAGE vs. TEMPERATURE
11.
LOW LEVEL OUTPUT SATURATION VOLTAGE vs. TEMPERATURE
12.
CLAMP DIODE FORWARD VOLTAGE vs. FORWARD CURRENT
13.
PROPAGATION DELAY — HIGH to LOW
14.
PROPAGATION DELAY — LOW to HIGH
4
Copyright © 1999
Rev. 1.3 6/99
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
U
N D E RV O LTA G E
S
E N S I N G
C
I R C U I T
P
R O D U C T I O N
D
A T A
S
H E E T
CHARACTERISTIC
CURVES
FIGURE 1.
—
INPUT VOLTAGE and RESET OUTPUT
VOLTAGE vs. TIME
20
FIGURE 2.
—
POWER-UP RESET VOLTAGE
2.0
RESET - (V)
15
10
5
0
R
L
= 10k
Power-Up RESET Voltage - (V)
T
A
= 25 C
1.8
1.6
1.4
1.2
1.0
R
L
= 10kohms
T
A
= 25 C
V
IN
0.8
0.6
20
V
IN
- (V)
15
10
5
0
0
.2
.4
.6
.8
1.0 1.2
1.4
1.6
1.8 2.0
RESET
0.4
0.2
0
0
0.4
0.8
1.2
1.6
2.0
(t) Time - (ms)
(t) Time - (ms)
FIGURE 3.
—
POWER-DOWN RESET VOLTAGE
2.0
1.8
FIGURE 4.
—
RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
5
(V
OUT
) RESET Output Voltage - (V)
Power-Down RESET Voltage - (V)
R
L
= 10kohms
T
A
= 25 C
R
L
= 10kohms
T
A
= 25 C
4
1.6
1.4
1.2
1.0
3
V
IN
0.8
0.6
0.4
2
1
RESET
0.2
0
0
0.4
0.8
1.2
1.6
2.0
0
4.58
4.59
4.60
4.61
4.62
(t) Time - (ms)
(V
IN
) Input Voltage - (V)
Copyright © 1999
Rev. 1.3 6/99
5
