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SUPPLY VOLTAGE
MONITOR
ISSUE 3 - NOVEMBER 1997
ZM33064
DEVICE DESCRIPTION
The ZM33064 is a three terminal under
voltage monitor circuit for use in
microprocessor systems. The threshold
voltage of the device has been set to 4.6 volts
making it ideal for 5 volt circuits.
Included in the device is a precise voltage
reference and a comparator with built in
hysteresis to prevent erratic operation. The
ZM33064 features an open collector output
capable of sinking at least l0mA which only
requires a single external resistor to
interface to following circuits.
Operation of the device is guaranteed from
one volt upwards, from this level to the
device threshold voltage the output is held
low providing a power on reset function.
Should the supply voltage, once established,
at any time drop below the threshold level
then the output again will pull low.
The device is available in a TO92 package for
through hole applications as well as SO8 and
SOT223 for surface mount requirements.
SCHEMATIC DIAGRAM
FEATURES
SO8, SOT223 and TO92 packages
•
Power on reset generator
•
Automatic reset generation
•
Low standby current
•
Guaranteed operation from 1 volt
•
Wide supply voltage range
•
Internal clamp diode to discharge delay
•
capacitor
4.6 volt threshold for 5 volt logic
•
20mV hysteresis prevents erratic operation
•
APPLICATIONS
Microprocessor systems
•
Computers
•
Computer peripherals
•
Instrumentation
•
Automotive
•
Battery powered equipment
•
4-89
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ZM33064
ABSOLUTE MAXIMUM RATING
Input Supply Voltage -1 to 10V
Offstate Output Voltage 10V
Onstate Output
Sink Current(
Note 1) Internally limited
Clamp diode
Forward Current(
Note 1) 100mA
Operating junction
temperature 150°C
Operating Temperature -40 to 85°C
Storage Temperature -65 to 150°C
TEST CONDITIONS
(T
=25°C for typical values, T
amb
=-40 to 85°C for min/max values (Note3))
amb
COMPARATOR
PARAMETER SYMBOL
Threshold Voltage
High state output (Vcc increasing)
Low state output (Vcc decreasing)
Hysteresis V
V
IH
V
IL
H
OUPUT
PARAMETER SYMBOL
Output sink saturation: V
(Vcc=4.0V, I
(V
=4.0V, I
cc
(V
=1.0V, I
cc
=8.0mA) 0.46 1.0 V
sink
=2.0mA) 0.15 0.4 V
sink
=0.1mA) 0.25 V
sink
Onstate output sink current
(V
, Output=4V)
cc
Offstate output leakage current
(V
, Output=5V)
cc
Clamp diode forward voltage
(I
=10mA)
f
Propagation delay
(V
5V to 4V, Rl=10k, T
in
amb
=25°C)
I
I
V
T
OL
sink
oh
f
d
TOTAL DEVICE
PARAMETER SYMBOL
Operating input voltage range V
Quiescent input current (V
Note:
1. Maximum package power dissipation must be observed
2. Maximum power dissipation, for the SOT223 and SO8 packages, is calculated assuming
that the device is mounted on a PCB measuring 2 inches square.
3. Low duty cycle pulse techniques are used during test to maintain junction temperatures as
=5V) I
cc
cc
q
Power Dissipation
TO92 780mW
SOT223 2W(
Note 2)
SO8 780mW(
MIN TYP. MAX.
4.5
4.5
4.61
4.59
4.7
4.7
UNITS
V
V
0.01 0.02 0.05 V
MIN TYP. MAX.
UNITS
10 20 60 mA
0.02 0.5
µA
0.6 1.2 1.5 V
1.5
MIN TYP. MAX.
µs
UNITS
1.0 to 6.5 V
135 200
µA
Note 2)
4-90
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TYPICAL CHARACTERISTICS
ZM33064
500
400
A)
µ
300
200
Input Current (
100
0
0246810
Input Voltage
-40 °C
25 °C
(V)
Input Current vs. Input Voltage
30
Sink Current (mA)
Vin=4V
20
10
-40 °C
25 °C
85 °C
85 °C
10
RL=10K
A
=25 °C
T
8
6
4
Output Voltage (V)
2
0
02
46
Input Voltage
Output Voltage vs. Input Voltage
L=10K
R
5
4
Vin (V)
'
4
2
Vout (V)
0
0 0.8 1.6 2.00.4 1.2
Output Saturation Voltage (V)
0
1
0
2
Time (µs)
Output Saturation Voltage vs. Sink Current Reset Delay Time
80
in
=0V
V
4.70
810
(V)
3
'
4
60
40
20
Forward Current (mA)
0
00.4 2.00.8 1.2 1.6
85 °C
25 °C
-40 °C
Clamp Diode Forward Current vs. Voltage
4-91
4.65
Upper Threshold
4.60
Lower Threshold
4.55
Threshold Voltage (V)
4.50
-40
020
-20
Temperature ( °C)Forward Voltage (V)
Threshold Voltage vs. Temperature
40 60
80
100
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ZM33064
TIMING DIAGRAM
Vcc
Threshold
Voltage
1 V
Output
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Output
Undefined
APPLICATION CIRCUIT
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Output
Undefined
Note 4: A time delayed reset can be accomplished with the additional Cd.
1
RCd
ln
1 −
T
=
DY
V
TH
(
mpu
)
V
in
TDY =Time (Seconds)
V
=Microprocessor Reset Threshold
TH
V
=Power Supply Voltage
in
4-92
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CONNECTION DIAGRAMS
SO8 Package Suffix – N8
ZM33064
SOT223 Package Suffix – G
Top View
TO92 Package Suffix – C
Bottom View –
ORDERING INFORMATION
Part Number Package Part Mark
ZM33064N8 SO8 ZM33064
ZM33064G SOT223 ZM33064
ZM33064C TO92 ZM33064
Top View –
Pin 4 floating or connected to pin 2
4-93
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