DIODES ZM33164-3

SUPPLY VOLTAGE
MONITOR
ZM33164-3
ISSUE 4 – JULY 2006
DEVICE DESCRIPTION
FEATURES
The ZM33164-3 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 2.68
volts making it ideal for 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
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.
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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.
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SCHEMATIC DIAGRAM
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© Zetex Semiconductors plc 2006
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
The device is available in a TO92 package for
through hole applications as well as SOT223
for surface mount requirements.
Issue 4 - July 2006
SOT223 and TO92 packages
Microprocessor systems
Computers
Computer peripherals
Instrumentation
Automotive
Battery powered equipment
ZM33164-3
500
5
400
4
Output Voltage (V)
Input Current (µA)
TYPICAL CHARACTERISTICS
300
200
-40 °C
25 °C 85 °C
100
R L =10K
T A=25 °C
3
2
1
0
0
0
2
4
6
8
10
0
1
Input Voltage (V)
Input Current vs. Input Voltage
50
2
3
4
5
Input Voltage (V)
Output Voltage vs. Input Voltage
R L =10K
Vin=2.4V
40
Vin
(V)
2.4
-40 °C
4
25 °C
20
85 °C
2
Vout
(V)
Sink Current (mA)
3.0
30
10
0
0
0
0.4
0.8
1.2
1.6
0
2.0
1
3
2
4
Time (µs)
Output Saturation Voltage (V)
Output Saturation Voltage vs. Sink Current
Reset Delay Time
100
2.77
Vin = 0V
2.75
Threshold Voltage (V)
Forward Current (mA)
80
60
85 °C
25 °C
40
-40 °C
20
Upper Threshold
2.73
2.71
2.69
2.67
Lower Threshold
2.65
0
0
0.4
0.8
1.2
1.6
-40
2.0
Forward Voltage (V)
-20
0
20
40
60
80
100
Temperature ( °C)
Clamp Diode Forward Current vs. Voltage
Threshold Voltage vs. Temperature
4-101
Issue 4 - July 2006
© Zetex Semiconductors plc 2006
www.zetex.com
ZM33164-3
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 12V
12V
Power Dissipation
TO92
SOT223
780mW
2W(Note 2)
Internally limited
100mA
150°C
-40 to 85°C
-65 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)
V IH
2.55
2.71
2.8
V
Threshold Voltage
Low state output (Vcc decreasing)
VIL
2.55
2.65
2.8
V
Hysteresis
VH
0.03
0.06
0.15
V
(Vcc=2.4V, Isink=8.0mA)
0.46
1.0
V
(Vcc=2.4V, Isink=2.0mA)
0.15
0.4
V
0.25
V
20
60
mA
0.02
0.5
µA
1.2
1.5
V
OUTPUT
Output sink saturation:
V OL
(Vcc=1.0V, Isink=0.1mA)
Onstate output sink current
(Vcc , Output=2.4V)
Isink
Offstate output leakage current
(Vcc , Output=3V)
Ioh
Clamp diode forward voltage
(If=10mA)
Vf
Propagation delay
(Vin 3V to 2.4V, Rl=10k, Tamb=25°C)
Td
10
0.6
µs
2.5
TOTAL DEVICE
Operating input voltage range
Vcc
Quiescent input current (Vcc=3V)
Iq
1.0 to 10
V
125
190
µA
4-100
Issue 4 - July 2006
© Zetex Semiconductors plc 2006
www.zetex.com
ZM33164-3
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
VTH (mpu ) ÷÷
Vin
÷
ø
TDY =Time (Seconds)
VTH =Microprocessor Reset Threshold
Vin =Power Supply Voltage
4-102
Issue 4 - July 2006
© Zetex Semiconductors plc 2006
www.zetex.com
ZM33164-3
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
ZM331643G
SOT223
ZM331643
ZM331643C
TO92
ZM331643
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United Kingdom
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Fax: (49) 89 45 49 49 49
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used, applied or reproduced for any purpose or form part of any order or contact or be regarded as a representation relating
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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 4 - July 2006
© Zetex Semiconductors plc 2006
www.zetex.com