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SUPPLY VOLTAGE MONITOR
ISSUE 3 - JULY 2006 DEVICE DESCRIPTION
The ZSM380 is a three terminal under v o l t a g e m o n i t or c ir c ui t fo r u s e i n microprocessor systems. The threshold voltage of the device has been set to 3.8 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 ZSM380 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 SOT223 for surface mount requirements.
ZSM380
FEATURES
* * * * * * * * * * * * * * *
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 3.8 volt threshold for 5 volt logic 20mV hysteresis prevents erratic operation
APPLICATIONS
Microprocessor systems Computers Computer peripherals Instrumentation Automotive Battery powered equipment
SCHEMATIC DIAGRAM
4-349
Issue 3 - July 2006
(c) Zetex Semiconductors plc 2006
ZSM380
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 Internally limited 100mA 150C -40 to 85C -55 to 150C Power Dissipation TO92 SOT223 780mW 2W(Note 2)
TEST CONDITIONS (Tamb=25C for typical values, Tamb=-40 to 85C for min/max values (Note3)) COMPARATOR
PARAMETER Threshold Voltage High state output (Vcc increasing) Threshold Voltage Low state output (Vcc decreasing) Hysteresis SYMBOL V IH V IL VH 3.7 3.7 0.01
MIN TYP. MAX.
UNITS V V V
3.81 3.79 0.02
3.9 3.9 0.05
OUPUT
Output sink saturation: (Vcc=3.3V, Isink=8.0mA) (Vcc=3.3V, Isink=2.0mA) (Vcc=1.0V, Isink=0.1mA) Onstate output sink current (Vcc , Output=3.3V) Offstate output leakage current (Vcc , Output=5V) Clamp diode forward voltage (If=10mA) Propagation delay (Vin 5V to 3.3V, Rl=10k, Tamb=25C) Isink Ioh Vf Td 0.6 10 27 0.02 1.2 3 V OL 0.46 0.15 1.0 0.4 0.25 60 0.5 1.5 V V V mA
A
V
s
TOTAL DEVICE
Operating input voltage range Quiescent input current (Vcc=5V) V cc Iq 1.0 to 6.5 140 200 V
A
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. 4-350
Issue 3 - July 2006
(c) Zetex Semiconductors plc 2006
www.zetex.com
ZSM380
TYPICAL CHARACTERISTICS
500 10 Rl=10K Ta=25C 400 85C 25C 8
Input Current (A)
300
Output Voltage (V)
-40C
6
200
4
100
2
0 0 2 4 6 8 10
0 0 2
Input Voltage (V)
Input Voltage (V)
4
6
8
10
Input Current vs. Input Voltage
50
Output Voltage vs. Input Voltage
Rl=10K Vin=3.3V 40 5
Vin (V) Sink Current (mA)
30 -40C 25C 20 85C
3.3
4 2
10
Vout (V)
0 0 0 0.4 0.8 1.2 1.6 2.0 0 2 4 6
Output Saturation Voltage (V)
Time (s)
Output I(sink) vs. Output V(sat)
50 Vin=0V 3.82
Reset Delay Time
Upper Threshold 40 3.81
Forward Current (mA)
Threshold Voltage (V)
30
85C 25C -40C
3.80
20
3.79 Lower Threshold
10
3.78
0 0 0.4 0.8 1.2 1.6 2.0
3.77 -40
-20
0
20
40
60
80
Forward Voltage (V)
Temperature ( C)
Clamp Diode I(forward) vs. Voltage
Threshold Voltage vs. Temperature
4-351
Issue 3 - July 2006
(c) Zetex Semiconductors plc 2006
www.zetex.com
100
ZSM380
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.
T DY = RCd ln
o / / / o
1-
1 V TH (mpu ) V in
Issue 3 - July 2006
(c) Zetex Semiconductors plc 2006
e c c c ae
TDY =Time (Seconds) VTH =Microprocessor Reset Threshold Vin =Power Supply Voltage
4-352
www.zetex.com
ZSM380
CONNECTION DIAGRAMS
SOT223 Package Suffix - G TO92 Package Suffix - C
Top View - Pin 4 floating or connected to pin 2
Bottom View
ORDERING INFORMATION
Part Number ZSM380G ZSM380C Package SOT223 TO92 Part Mark ZSM380 ZSM380
Europe Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com
Americas Zetex Inc 700 Veterans Memorial Highway Hauppauge, NY 11788 USA Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 usa.sales@zetex.com
Asia Pacific Zetex (Asia Ltd) 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 asia.sales@zetex.com
Corporate Headquarters Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom 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 4-353 to the products or services concerned. The company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.
Issue 3 - July 2006
(c) Zetex Semiconductors plc 2006
www.zetex.com

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