Page 1
SUPPLY VOLTAGE
MONITOR
ISSUE 2 – NOVEMBER 1995
ZM33164-3
DEVICE DESCRIPTION
The ZM33164-3 is a three terminal under
voltage monitor circuit for use in
microprocessor systems. The threshold
voltage of the device has been set to 2.68
volts making it ideal for 3 volt circuits.
Included in the device is a precise voltage
reference and a comparator with built in
hysteresis to prevent erratic operation. The
ZM33164-3 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.
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
•
2.68 volt threshold for 3 volt logic
•
60mV hysteresis prevents erratic operation
APPLICATIONS
•
Microprocessor systems
•
Computers
•
Computer peripherals
•
Instrumentation
•
Automotive
•
Battery powered equipment
SCHEMATIC DIAGRAM
4-99
Page 2
0246810
-40 °C 25 °C 85 °C
100
200
400
300
500
01
0 0.8 1.6 2.00.4 1.2
0
20
40
50
Sink Current (mA)
-40 °C
25 °C
85 °C
00.4 2.00.8 1 .2 1.6
0
40
60
80
20
-40 °C
85 °C
25 °C
V
in
=
0V
23
45
1
2
3
4
5
0
Output Voltage (V)
0
1
2
3
4
2
4
0
Vin
(V)
2.4
3.0
-40
-20
020406080
2.69
2.67
Temperature ( °C)Forward Voltage (V)
Threshold Voltage (V)
Forward Current (mA)
Input Current (
µ
A)
Input Voltage (V)
Upper Threshold
Lower Threshold
Input Current vs. Input Voltage Output Voltage vs. Input Voltage
Output Saturation Voltage vs. Sink Current Reset Delay Time
Clamp Diode Forward Current vs. Voltage Threshold Voltage vs. Temperature
Input Voltage (V)
Output Saturation Voltage (V)
Vout
(V)
Time (µs)
0
30
10
100
100
2.71
2.73
2.75
2.77
2.65
RL=10K
T
A
=25 °C
R
L
=10K
'
'
Vin=2.4V
ZM33164-3
TYPICAL CHARACTERISTICS
4-101
Page 3
TEST CONDITIONS
(T
amb
=25°C for typical values, T
amb
=-40 to 85°C for min/max values (Note3))
COMPARATOR
PARAMETER SYMBOL
MIN TYP. MAX.
UNITS
Threshold Voltage
High state output (Vcc increasing) V
IH
2.55 2.71 2.8 V
Threshold Voltage
Low state output (Vcc decreasing) V
IL
2.55 2.65 2.8 V
Hysteresis V
H
0.03 0.06 0.15 V
OUTPUT
Output sink saturation: V
OL
(Vcc=2.4V, I
sink
=8.0mA) 0.46 1.0 V
(V
cc
=2.4V, I
sink
=2.0mA) 0.15 0.4 V
(V
cc
=1.0V, I
sink
=0.1mA) 0.25 V
Onstate output sink current
(V
cc
, Output=2.4V)
I
sink
10 20 60 mA
Offstate output leakage current
(V
cc
, Output=3V)
I
oh
0.02 0.5
µA
Clamp diode forward voltage
(I
f
=10mA)
V
f
0.6 1.2 1.5 V
Propagation delay
(V
in
3V to 2.4V, Rl=10k, T
amb
=25°C)
T
d
2.5
µs
TOTAL DEVICE
Operating input voltage range V
cc
1.0 to 10 V
Quiescent input current (V
cc
=3V) I
q
125 190
µA
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
close to ambient as possible
ZM33164-3
ABSOLUTE MAXIMUM RATING
Input Supply Voltage -1 to 12V
Offstate Output Voltage 12V
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
Power Dissipation
TO92 780mW
SOT223 2W(
Note 2)
SO8 780mW(
Note 2)
4-100
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Vcc
Threshold
Voltage
1 V
Output
Undefined
Output
Undefined
Output
Note 4: A time delayed reset can be accomplished with the additional Cd.
T
DY
=
RCd
ln
1
1 −
V
TH(mpu
)
V
in
TIMING DIAGRAM
APPLICATION CIRCUIT
TDY =Time (Seconds)
V
TH
=Microprocessor Reset Threshold
V
in
=Power Supply Voltage
ZM33164-3
4-102
Page 5
SO8 Package Suffix – N8
Top View
SOT223 Package Suffix – G
Top View –
Pin 4 floating or connected to pin 2
CONNECTION DIAGRAMS
ORDERING INFORMATION
Part Number Package Part Mark
ZM331643N8 SO8 ZM331643
ZM331643G SOT223 ZM331643
ZM331643C TO92 ZM331643
TO92 Package Suffix – C
Bottom View
ZM33164-3
4-103
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