SUPPLY VOLTAGE
MONITOR
ZSM330
ISSUE 3 – JULY 2006
DEVICE DESCRIPTION
FEATURES
The ZSM330 is a three terminal under
voltage monitor circuit for use in
microprocessor systems. The threshold
voltage of the device has been set to 3.1 volts
making it ideal for 3.3 volt circuits.
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Included in the device is a precise voltage
reference and a comparator with built in
hysteresis to prevent erratic operation. The
ZSM330 features an open collector output
capable of sinking at least l0mA which only
requires a single external resistor to
interface to following circuits.
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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
3.1 volt threshold for 3.3 volt logic
20mV hysteresis prevents erratic operation
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.
APPLICATIONS
The device is available in a TO92 package for
through hole applications as well as SOT223
for surface mount requirements.
Automotive
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SCHEMATIC DIAGRAM
4-344
Issue 3 - July 2006
© Zetex Semiconductors plc 2006
Microprocessor systems
Computers
Computer peripherals
Instrumentation
Battery powered equipment
ZSM330
ABSOLUTE MAXIMUM RATING
Input Supply Voltage
Offstate Output Voltage
Onstate Output
Sink Current(Note 1)
Clamp Diode
Forward Current(Note 1)
Operating Junction
Temperature
Operating Temperature
Storage Temperature
-1 to 10V
10V
Power Dissipation
TO92
SOT223
780mW
2W(Note 2)
Internally limited
100mA
150°C
-40 to 85°C
-55 to 150°C
TEST CONDITIONS
(Tamb=25°C for typical values, Tamb=-40 to 85°C for min/max values (Note3))
COMPARATOR
MIN
TYP.
MAX.
PARAMETER
SYMBOL
UNITS
Threshold Voltage
High state output (Vcc increasing)
VIH
3.01
3.09
3.15
V
Threshold Voltage
Low state output (Vcc decreasing)
VIL
3.01
3.07
3.15
V
Hysteresis
VH
0.01
0.02
0.05
V
(Vcc=2.7V, Isink=8.0mA)
0.46
1.0
V
(Vcc=2.7V, Isink=2.0mA)
0.15
0.4
V
0.25
V
27
60
mA
0.02
0.5
µA
1.2
1.5
V
OUPUT
Output sink saturation:
VOL
(Vcc=1.0V, Isink=0.1mA)
Onstate output sink current
(Vcc , Output=2.7V)
Isink
Offstate output leakage current
(Vcc , Output=3.3V)
Ioh
Clamp diode forward voltage
(If=10mA)
Vf
Propagation delay
(Vin 3.3V to 2.7V, Rl=10k, Tamb=25°C)
Td
10
0.6
µs
2.2
TOTAL DEVICE
Operating input voltage range
Vcc
Quiescent input current (Vcc=3.3V)
Iq
1.0 to 6.5
V
120
180
µA
Note:
1. Maximum package power dissipation must be observed
2. Maximum power dissipation, for the SOT223 package 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
4-345
Issue 3 - July 2006
© Zetex Semiconductors plc 2006
www.zetex.com
ZSM330
500
5
400
4
Output Voltage (V)
Input Current (µA)
TYPICAL CHARACTERISTICS
300
85 ˚C
200
-40 ˚C
100
25 ˚C
3
2
1
0
0
0
2
4
6
8
10
0
5
Input Current vs. Input Voltage
Output Voltage vs. Input Voltage
2.7V
R 10K
40
Vin
(V)
3.3
30
2.7
2
-40 ˚C
4
25 ˚C
20
85 ˚C
Vout
(V)
2
10
0
0
0
0.4
0.8
1.2
1.6
0
2.0
1
4
Reset Delay Time
Output Saturation Voltage vs. Sink Current
100
3
2
Time (µs)
Output Saturation Voltage (V)
3.10
Vin=0V
Upper
Threshold
3.09
Threshold Voltage (V)
80
Forward Current (mA)
4
3
Input Voltage (V)
50
Sink Current (mA)
2
1
Input Voltage (V)
60
85 ˚C
25 ˚C
40
-40 ˚C
20
3.08
3.07
Lower
Threshold
3.06
3.05
0
0
0.4
0.8
1.2
1.6
-40
2.0
-20
0
20
40
60
80
100
Temperature ( ˚C )
Forward Voltage (V)
Clamp Diode Forward Current vs. Voltage
Threshold Voltage vs. Temperature
4-346
Issue 3 - July 2006
© Zetex Semiconductors plc 2006
www.zetex.com
ZSM330
TIMING DIAGRAM
Vcc
Threshold
Voltage
1V
Output
Output
Undefined
Output
Undefined
APPLICATION CIRCUIT
Note 4:
A time delayed reset can be accomplished with the additional Cd.
æ
T DY = RCd ln ç
ç
1
ç
è
−
1
ö
V TH ( mpu ) ÷÷
V in
÷
ø
TDY =Time (Seconds)
VTH =Microprocessor Reset Threshold
Vin =Power Supply Voltage
4-347
Issue 3 - July 2006
© Zetex Semiconductors plc 2006
www.zetex.com
ZSM330
CONNECTION DIAGRAMS
TO92 Package Suffix – C
SOT223
Package Suffix – G
Bottom View
Top View –
Pin 4 floating or connected to pin 2
ORDERING INFORMATION
Part Number
Package
Part Mark
ZSM330G
SOT223
ZSM330
ZSM330C
TO92
ZSM330
Europe
Americas
Asia Pacific
Corporate Headquarters
Zetex GmbH
Streitfeldstraße 19
D-81673 München
Germany
Zetex Inc
700 Veterans Memorial Highway
Hauppauge, NY 11788
USA
Zetex (Asia Ltd)
3701-04 Metroplaza Tower 1
Hing Fong Road, Kwai Fong
Hong Kong
Zetex Semiconductors plc
Zetex Technology Park, Chadderton
Oldham, OL9 9LL
United Kingdom
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
europe.sales@zetex.com
Telephone: (1) 631 360 2222
Fax: (1) 631 360 8222
usa.sales@zetex.com
Telephone: (852) 26100 611
Fax: (852) 24250 494
asia.sales@zetex.com
Telephone: (44) 161 622 4444
Fax: (44) 161 622 4446
hq@zetex.com
For international sales offices visit www.zetex.com/offices
Zetex products are distributed worldwide. For details, see www.zetex.com/salesnetwork
This publication is issued to provide outline information only which (unless agreed by the company in writing) may not be
used, applied or reproduced for any purpose or form part of any order or contact or be regarded as a representation relating
to the products or services concerned. The company reserves
the right to alter without notice the specification, design, price
4-348
or conditions of supply of any product or service.
Issue 3 - July 2006
© Zetex Semiconductors plc 2006
www.zetex.com
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