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PDF ZXCM209XF Data sheet ( Hoja de datos )
| Número de pieza | ZXCM209XF | |
| Descripción | VERY LOW POWER MICROPROCESSOR RESET DEVICES | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ZXCM209XF (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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VERY LOW POWER MICROPROCESSOR RESET DEVICES
ZXCM209
ZXCM210
DESCRIPTION
The ZXCM209/210 are three terminal supervisory
circuits used to monitor the power supplies in
microprocessor and digital systems. They provide a
high performance economical solution when used
with 5V, 3V or lower powered circuits. Reset
thresholds suitable for operation with a variety of
supply voltages are available.
These devices provide a reset signal whenever the
supply voltage falls below a preset threshold, keeping
it asserted for a minimum delay period of 140ms after
the supply has risen above the reset level. The
ZXCM209 has an active-low RESET output (which is
guaranteed to be in the correct state for supplies down
to 1V), while the ZXCM210 has an active-high RESET
output.
The reset comparator has in built hysteresis to prevent
erratic operation and is designed to ignore supply
transients. Low supply current (typically 2µA) makes
the ZXCM209/210 devices ideal for use in portable
equipment. They are available in a 3-pin SOT23
surface mount package with an industry standard
pinout.
FEATURES
• Enhanced alternative to MAX809/810 and similar
parts
• Precision monitoring of 5V, 3.3V, 3V power
supply voltages
• 1% threshold tolerance
• 2µA typical supply current
• 140ms minimum power on reset pulse width
• Alternative minimum pulse widths available,
contact your local sales office for availability
• RESET LOW Output (ZXCM209)
• RESET HIGH Output (ZXCM210)
• Power supply transient immunity
• No latch up
• No external components
• 3-Pin SOT23 package
APPLICATIONS
• Computer systems
• Controllers
• Instrumentation
• Microprocessor power monitoring
• Microcontroller power monitoring
• Power supplies
• Portable/Battery-powered equipment
• Automotive
APPLICATION CIRCUIT
vcc
vcc
ZXCM
Reset
Output
vcc
Micro
Reset
Input
Gnd
Gnd
ISSUE 3 - FEBRUARY 2001
1
1 page  
ZXCM209
ZXCM210
APPLICATIONS INFORMATION
Negative going VCC transients
The ZXCM209/210 are, to a good degree, immune to
short duration negative going supply transients. Under
certain circumstances very brief transients are allowed
without inappropriate false triggering of the reset
circuit. The response to supply transients is shown in the
Noise Immunity graph in the typical characteristics. The
graph indicates the typical allowable transient duration
for a specified threshold overdrive such that a reset
pulse is not generated. Addition of a bypass capacitor,
e.g. 0.1µF, as close as possible to the VCC pin will provide
extra transient immunity.
Reset valid down to very low supply voltages
With VCC between 0V and 1V the output of the
ZXCM209/210 may be in an undefined state. In many
systems this is inconsequential as the
microprocessor, and other circuits, will be inoperative
with supplies this low. In applications where this is
important, the addition of an external resistor ensures
that the reset output remains valid for VCC < 1V. The
resistor value is non critical: a value of 100kΩ is
recommended. For the ZXCM209 the resistor should
be applied between reset output and ground: for the
ZXCM210 between reset output and VCC. Figure 1
shows the connection diagram for the ZXCM devices
in these configurations.
vcc
vcc
ZXCM209
Reset
Output
Gnd
vcc
Micro
Reset
Input
100k
Gnd
vcc
vcc
ZXCM210
Reset
Output
100k
vcc
Micro
Reset
Input
Gnd
Gnd
Figure 1
Circuit for operation of ZXCM with reset valid down to very low supply voltage.
ISSUE 3 - FEBRUARY 2001
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet ZXCM209XF.PDF ] | |
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