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Электронный компонент: ZM331643G

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SUPPLY VOLTAGE
MONITOR
ISSUE 2 NOVEMBER 1995
ZM33164-3
DEVICE DESCRIPTION
The ZM33164-3 is a three terminal under
v o l ta g e mo n i t o r c i rc u i t f o r u s e i n
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
0
2
4
6
8
10
-40 C
25 C 85 C
100
200
400
300
500
0
1
0
0.8
1.6
2.0
0.4
1.2
0
20
40
50
S
i
nk Curre
n
t

(
m
A
)
-40 C
25 C
85 C
0
0.4
2.0
0.8
1.2
1.6
0
40
60
80
20
-40 C
85 C
25 C
Vin = 0V
2
3
4
5
1
2
3
4
5
0
O
u
tput V
o
l
t
ag
e (V)
0
1
2
3
4
2
4
0
Vin
(V)
2.4
3.0
-40
-20
0
20
40
60
80
2.69
2.67
Temperature ( C)
Forward Voltage (V)
T
h
r
e
shol
d V
o
l
t
age
(
V
)
F
o
rw
a
r
d
C
urrent
(
m
A
)
In
put C
urrent
(
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)
V
out
(V)
Time (
s)
0
30
10
100
100
2.71
2.73
2.75
2.77
2.65
R
L
=10K
T
A
=25 C
R
L
=10K
V
in
=2.4V
ZM33164-3
TYPICAL CHARACTERISTICS
4-101
TEST CONDITIONS
(T
amb
=25C for typical values, T
amb
=-40 to 85C 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
(V
cc
=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
A
Clamp diode forward voltage
(I
f
=10mA)
V
f
0.6
1.2
1.5
V
Propagation delay
(V
in
3V to 2.4V, R
l
=10k, T
amb
=25C)
T
d
2.5
s
TOTAL DEVICE
Operating input voltage range
V
cc
1.0 to 10
V
Quiescent input current (V
cc
=3V)
I
q
125
190
A
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
150C
Operating Temperature
-40 to 85C
Storage Temperature
-65 to 150C
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
T
DY
=Time (Seconds)
V
TH
=Microprocessor Reset Threshold
V
in
=Power
Supply
Voltage
ZM33164-3
4-102
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