Diodes ZSM560 User Manual
Issue 4 - July 2006
© Zetex Semiconductors plc 2006
SUPPLY VOLTAGE
MONITOR
ISSUE 4 – JULY 2006
ZSM560
DEVICE DESCRIPTION
The ZSM560 is a three terminal under
voltage monitor circuit for use in
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
ZSM560 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.
SCHEMATIC DIAGRAM
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
4.6 volt threshold for 5 volt logic
•
20mV hysteresis prevents erratic operation
•
APPLICATIONS
Microprocessor systems
•
Computers
•
Computer peripherals
•
Instrumentation
•
Automotive
•
Battery powered equipment
•
4-359
Issue 4 - July 2006 www.zetex.com
© Zetex Semiconductors plc 2006
ZSM560
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
TEST CONDITIONS
=25°C for typical values, T
(T
amb
=-40 to 85°C for min/max values (Note3))
amb
COMPARATOR
PARAMETER SYMBOL
Threshold Voltage
High state output (Vcc increasing) V
IH
Threshold Voltage
Low state output (Vcc decreasing) V
Hysteresis V
IL
H
OUPUT
Output sink saturation: V
(Vcc=4.0V, I
(V
=4.0V, I
cc
(V
=1.0V, I
cc
=8.0mA) 0.46 1.0 V
sink
=2.0mA) 0.15 0.4 V
sink
=0.1mA) 0.25 V
sink
Onstate output sink current
(V
, Output=4V)
cc
Offstate output leakage current
(V
, Output=5V)
cc
Clamp diode forward voltage
(I
=10mA)
f
Propagation delay
(V
5V to 4V, Rl=10k, T
in
amb
=25°C)
I
I
V
T
OL
sink
oh
f
d
TOTAL DEVICE
Operating input voltage range V
Quiescent input current (V
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.
=5V) I
cc
cc
q
Power Dissipation
TO92 780mW
SOT223 2W(
MIN TYP. MAX.
Note 2)
UNITS
4.5 4.61 4.7 V
4.5 4.59 4.7 V
0.01 0.02 0.05 V
10 20 60 mA
0.02 0.5
µA
0.61.21.5V
1.5
µs
1.0 to 6.5 V
135 200
µA
4-360
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