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PDF V6319 Data sheet ( Hoja de datos )
| Número de pieza | V6319 | |
| Descripción | 3-Pin Microprocessor Reset Circuit | |
| Fabricantes | ETC | |
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®
EM MICROELECTRONIC-MARIN SA V6309/V6319
3-Pin Microprocessor Reset Circuit
Features
n Precision monitoring of 3 V, 3.3 V and 5 V power
supply voltages
n Fully specified over the temperature range of
-40 to + 125 oC
n 140 ms minimum power-on reset pulse width:
RESET output for V6309
RESET output for V6319
n 16 µA supply current
n Garanteed RESET/RESET valid to VDD = 1 V
n Power supply transient immunity
n No external components needed
n 3-pin SOT-23 package
n Fully compatible with MAX809/MAX810 and
AMD809/AMD810
Typical Operating Configuration
Description
The V6309 and V6319 are microprocessor supervisory cir-
cuits used to monitor the power supplies in µP and digital
systems. They provide excellent circuit reliability and low
cost by eliminating external components and adjustments
when used with 5 V powered or 3 V powered circuits.
These circuits perform a single function: they assert a re-
set signal whenever the VDD supply voltage declines below
a preset threshold, keeping it asserted for at least 140 ms
after VDD has risen above the reset threshold. The only dif-
ference between the two devices is that the V6309 has an
active-low RESET output (which is guaranteed to be in the
correct state for VDD down to 1 V), while the V6319 has an
active-high RESET output. The reset comparator is de-
signed to ignore fast transients on VDD. Reset thresholds
suitable for operation with a variety of supply voltages are
available.
Low supply current makes the V6309/V6319 ideal for use
in portable equipment. The V6309/V6319 come in a 3-pin
SOT-23 package
Applications
n Computers
n Controllers
n Intelligent instruments
n Critical µP and µC power monitoring
n Portable/battery-powered equipment
Pin Assignment
Fig. 1
Fig. 2
1
1 page  
®
RESET Valid for VDD = Ground Circuit
V6309/V6319
Interfacing to µPs with Bidirectional Reset I/O
Fig. 10
Fig. 11
Interfacing to µPs with Bidirectional Reset Pins
Microprocessors with bidirectional reset pins (such as the
Motorola 68HC11 series) can connect to the V6309 reset
output. If, for example, the V6309 RESET output is as-
serted high and the µP wants to pull it low, indeterminate
logic levels may result. To correct this, connect a 4.7 kΩ re-
sistor between the V6309 RESET output and the µP reset
I/O (Fig. 11). Buffer the V6309 RESET output to other sys-
tem components.
Benefits of Highly Accurate Reset Threshold
Most µP supervisor ICs have reset threshold voltages be-
tween 5% and 10% below the value of nominal supply
voltages. This ensures a reset will not occur within 5% of
the nominal supply, but will occur when the supply is 10%
below nominal. When using ICs rated at only the nominal
supply ±5%, this leaves a zone of uncertainty where the
supply is between 5% and 10% low, and where the reset
may or may not be asserted.
The V6309L/T and V6319L/T use highly accurate circuitry
to ensure that reset is asserted close to the 5% limit, and
long before the supply has declined to 10% below nomi-
nal.
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet V6319.PDF ] | |
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