Zetex ZSM330C, ZSM330G, ZSM330N8 Datasheet
SUPPLY VOLTAGE
MONITOR
ISSUE 1 – NOVEMBER 1995
ZSM330
DEVICE DESCRIPTION
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.
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.
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
•
3.1 volt threshold for 3.3 volt logic
•
20mV hysteresis prevents erratic operation
APPLICATIONS
•
Microprocessor systems
•
Computers
•
Computer peripherals
•
Instrumentation
•
Automotive
•
Battery powered equipment
SCHEMATIC DIAGRAM
4-344
TEST CONDITIONS
(T
amb
=25°C for typical values, T
amb
=-40 to 85°C for min/max values (Note3))
COMPARATOR
PARAMETER SYMBOL
MIN TYP. MAX.
UNITS
Threshold Voltage
High state output (V
cc
increasing) V
IH
3.01 3.09 3.15 V
Threshold Voltage
Low state output (V
cc
decreasing) V
IL
3.01 3.07 3.15 V
Hysteresis V
H
0.01 0.02 0.05 V
OUPUT
Output sink saturation: V
OL
(Vcc=2.7V, I
sink
=8.0mA) 0.46 1.0 V
(V
cc
=2.7V, 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=2.7V)
I
sink
10 27 60 mA
Offstate output leakage current
(V
cc
, Output=3.3V)
I
oh
0.02 0.5
µA
Clamp diode forward voltage
(I
f
=10mA)
V
f
0.6 1.2 1.5 V
Propagation delay
(V
in
3.3V to 2.7V, Rl=10k, T
amb
=25°C)
T
d
2.2
µs
TOTAL DEVICE
Operating input voltage range V
cc
1.0 to 6.5 V
Quiescent input current (V
cc
=3.3V) I
q
120 180
µA
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
ZSM330
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 150°C
Operating Temperature -40 to 85°C
Storage Temperature -55 to 150°C
Power Dissipation
TO92 780mW
SOT223 2W(
Note 2)
SO8 780mW(
Note 2)
4-345
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