zsm561 Zetex Semiconductors plc., zsm561 Datasheet

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zsm561

Manufacturer Part Number
zsm561
Description
Supply Voltage Monitor
Manufacturer
Zetex Semiconductors plc.
Datasheet
SUPPLY VOLTAGE
MONITOR
ISSUE 3 – JANUARY 1998
DEVICE DESCRIPTION
The ZSM561 is a three terminal under
vo l ta ge mo ni t or ci rc ui t f or use i n
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
ZSM561 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. Also
included is a 6 volt zener diode connected
between Vcc and Gnd. With just the addition
of a low cost external NPN transistor and
resistor, this zener allows the ZSM561 to
provide both regulator and supply monitor
functions
The device is available in a TO92 package for
through hole applications as well as SO8 and
SOT223 for surface mount requirements.
SCHEMATIC DIAGRAM
4-364
FEATURES
APPLICATIONS
SO8, SOT223 and TO92 packages
Power on reset generator
Automatic reset generation
Low standby current
Guaranteed operation from 1 volt
Wide supply voltage range
delay capacitor
4.6 volt threshold for 5 volt logic
20mV hysteresis prevents erratic operation
Microprocessor systems
Computers
Computer peripherals
Instrumentation
Automotive
Battery powered equipment
Internal clamp diode to discharge
ZSM561

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zsm561 Summary of contents

Page 1

... SUPPLY VOLTAGE MONITOR ISSUE 3 – JANUARY 1998 DEVICE DESCRIPTION The ZSM561 is a three terminal under use i n 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 ...

Page 2

... SUPPLY ZENER Avalanche Voltage:(Icc=1mA) Slope Resistance: (Icc=15mA) (Icc=15mA to 50mA) TOTAL DEVICE Operating input voltage range(Note 5) V Quiescent current (V =5V) cc ZSM561 Operating Junction Temperature Operating Temperature Storage Temperature Power Dissipation TO92 SOT223 SO8 =-40 to 85°C for min/max values (Note3)) amb MIN TYP ...

Page 3

... ZSM561 TYPICAL CHARACTERISTICS 500 400 300 200 100 25 °C 85 °C -40 ° Input Voltage (V) Input Current vs. Input Voltage 30 V =4V in -40 °C 25 ° ° 0.4 0.8 1.2 1.6 2.0 Output Saturation Voltage (V) Output Saturation Voltage vs. Sink Current ° °C -40 ° ...

Page 4

... AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA AAAA Output Undefined z 4-367 ZSM561 100 AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA AAA ...

Page 5

... V 6 INMIN The minimum input voltage provided INMIN by the unregulated supply The ZSM561 quiescent current (ie 200 Load current taken by the microprocessor L system Time (Seconds Microprocessor ResetThreshold Power Supply Voltage The minimum h that can be expected ...

Page 6

... SO8 Package Suffix – N8 Top View TO92 Package Suffix – C Bottom View ORDERING INFORMATION Part Number Package ZSM561N8 SO8 ZSM561G SOT223 ZSM561C TO92 SOT223 Package Suffix – G Top View – Pin 4 floating or connected to pin 2 Part Mark ZSM561 ZSM561 ZSM561 4-369 ZSM561 ...

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