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Электронный компонент: ZSM530

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SUPPLY VOLTAGE
MONITOR
ISSUE 1 NOVEMBER 1995
ZSM530
DEVICE DESCRIPTION
The ZSM530 is a three terminal under
v o l t a g e m o n i t o r c i r c u i t f o r u s e i n
microprocessor systems. The threshold
voltage of the device has been set to 4.3 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
ZSM530 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
4.3 volt threshold for 5 volt logic
20mV hysteresis prevents erratic operation
APPLICATIONS
Microprocessor systems
Computers
Computer peripherals
Instrumentation
Automotive
Battery powered equipment
SCHEMATIC DIAGRAM
4-354
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 (V
cc
increasing)
V
IH
4.2
4.31
4.4
V
Threshold Voltage
Low state output (V
cc
decreasing)
V
IL
4.2
4.29
4.4
V
Hysteresis
V
H
0.01
0.02
0.05
V
OUPUT
Output sink saturation:
V
OL
(V
cc
=3.8V, I
sink
=8.0mA)
0.46
1.0
V
(V
cc
=3.8V, 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=3.8V)
I
sink
10
27
60
mA
Offstate output leakage current
(V
cc
, Output=5V)
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
5V to 3.8V, R
l
=10k, T
amb
=25C)
T
d
2
s
TOTAL DEVICE
Operating input voltage range
V
cc
1.0 to 6.5
V
Quiescent input current (V
cc
=5V)
I
q
175
260
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.
ZSM530
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
150C
Operating Temperature
-40 to 85C
Storage Temperature
-55 to 150C
Power Dissipation
TO92
780mW
SOT223
2W(
Note 2
)
SO8
780mW(
Note 2
)
4-355
0
2
4
6
8
10
-40 C 25 C
85 C
100
200
400
300
500
0
2
0
0.8
1.6
2.0
0.4
1.2
0
20
40
50
S
i
nk Curr
ent (
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
4
6
8
10
2
4
6
8
10
0
Output V
o
l
tage
(V)
0
1
2
3
4
2
4
0
V
in (V)
4
5
-40
-20
0
20
40
60
80
4.25
4.20
Temperature (C)
Forward Voltage (V)
Threshol
d V
o
l
tage (V)
Forward Curr
ent
(m
A
)
I
n
put C
u
r
rent (
A)
Input Voltage
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
Output Saturation Voltage (V)
V
out (V)
(V)
(V)
Time (
s)
0
30
10
100
100
4.30
4.35
4.40
R
A
=10K
T
A
=25 C
R
L
=10K
V
in
=4V
V
in
=0V
ZSM530
TYPICAL CHARACTERISTICS
4-356
ZSM530
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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
4-357
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
ZSM530N8
SO8
ZSM530
ZSM530G
SOT223
ZSM530
ZSM530C
TO92
ZSM530
TO92 Package Suffix C
Bottom
View
ZSM530
4-358