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Электронный компонент: ZSM561G

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SUPPLY VOLTAGE
MONITOR
ISSUE 3 JANUARY 1998
ZSM561
DEVICE DESCRIPTION
The ZSM561 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 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
ZSM561 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. Also
included is a 6 volt zener diode connected
between Vcc and Gnd. With just the addition
of a low cost external NPN transistor and
resistor, this zener allows the ZSM561 to
provide both regulator and supply monitor
functions
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
4.6 volt threshold for 5 volt logic
20mV hysteresis prevents erratic operation
APPLICATIONS
Microprocessor systems
Computers
Computer peripherals
Instrumentation
Automotive
Battery powered equipment
SCHEMATIC DIAGRAM
4-364
ZSM561
ABSOLUTE MAXIMUM RATING
Input Supply Voltage
-1 to 7V
Supply Zener Current
25mA continuous
Offstate Output Voltage
7V
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
)
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
4.5
4.61
4.7
V
Threshold Voltage
Low state output (Vcc decreasing)
V
IL
4.5
4.59
4.7
V
Hysteresis
V
H
0.01
0.02
0.05
V
OUPUT
Output sink saturation:
V
OL
(V
cc
=4.0V, I
sink
=8.0mA)
0.46
1.0
V
(V
cc
=4.0V, 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=4V)
I
sink
10
20
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 4V, R
l
=10k, T
amb
=25C)
T
d
1.5
s
SUPPLY ZENER
Avalanche Voltage:(Icc=1mA)
V
z
5.8
6
6.2
V
Slope Resistance: (Icc=15mA)
(Icc=15mA
to
50mA)
R
z
45
21
60
30

TOTAL DEVICE
Operating input voltage range(Note 5)
V
cc
1.0 to 7
V
Quiescent current (V
cc
=5V)
I
q
135
200
A
4-365
0
2
0
0.8
1.6
2.0
0.4
1.2
0
10
20
30
Sink C
u
r
r
ent (
m
A)
-40 C
25 C
85 C
4
6
8
10
2
4
6
8
10
0
Outpu
t V
o
ltag
e (V
)
0
1
2
3
4
2
4
-1
0
Time (
s)
Vi
n (V)
4
5
R
L
=10K
Forward Voltage (V)
For
war
d
C
u
r
ren
t (mA
)
Input Curr
ent
(
A)
Input Voltage (V)
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
Input Voltage (V)
Output Saturation Voltage (V)
V
o
u
t
(V)
500
400
300
200
100
0
0
2
4
6
8
10
-40 C
85 C
25 C
80
60
40
20
0
0
0.4
0.8
1.2
1.6
2.0
V
in
=0V
-40 C
85 C
25 C
R
L
=10K
T
A
=25 C
V
in
=4V
ZSM561
TYPICAL CHARACTERISTICS
4-366
ZSM561
I
nput
Cu
rren
t (m
A
)
Input Voltage (V)
Input Current vs. Input Voltage
50
40
30
20
10
0
0
2
4
6
8
10
-40
-20
0
20
40
60
80
4.70
4.65
4.60
4.55
4.50
Temperature ( C)
Thr
e
s
hol
d V
o
l
t
a
g
e

(
V
)
Threshold Voltage vs. Temperature
Upper Threshold
Lower Threshold
100
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
4. A time delayed reset can be accomplished with the additional Cd.
5. Operation above V
z
may be restricted by the supply current rating I
z
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Vcc
Threshold
Voltage
1 V
Output
Undefined
Output
Undefined
Output
TYPICAL CHARACTERISTICS
TIMING DIAGRAM
4-367
ZSM561
T
DY
=
RCd
ln



1
1
-
V
TH
(
mpu
)
V
in



APPLICATION CIRCUITS
R
B
=
(
V
INMIN
-
6
)
(
I
Q
+
I
L
h
FE
)
V
INMIN
= The minimum input voltage provided
by the unregulated supply.
I
Q
= The ZSM561 quiescent current (ie 200
A)
I
L
= Load current taken by the microprocessor
system.
h
FE
= The minimum h
FE
that can be expected
from the pass transistor under worst case
conditions. (ie L owe st te mp erature and
minimum input voltage). For the ZTX690B a
value of 250 could be used.
T
DY
= Time (Seconds)
V
TH
= Microprocessor ResetThreshold
V
in
=
Power
Supply
Voltage
4-368
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
ZSM561N8
SO8
ZSM561
ZSM561G
SOT223
ZSM561
ZSM561C
TO92
ZSM561
TO92 Package
Suffix C
Bottom
View
ZSM561
4-369