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PDF AX6902 Data sheet ( Hoja de datos )
| Número de pieza | AX6902 | |
| Descripción | (AX6901 - AX6904) 3-Pin Microprocessor Reset Circuits | |
| Fabricantes | AXElite | |
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AX6901/2/3/4(Preliminary)
3-Pin Microprocessor Reset Circuits
GENERAL DESCRIPTION
TheAX6901/2/3/4 are used for microprocessor (µP) supervisory circuits 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 +5V, +3.3V,
+3.0V powered circuits.
These circuits perform a single function: they assert a reset signal whenever the VCC
supply voltage declines below a preset threshold, keeping it asserted for at least 200ms
after VCC has risen above the reset threshold. Reset thresholds suitable for operation
with a variety of supply voltages are available. TheAX6901/2/3/4 have push pull outputs.
TheAX6901/3 have an active low RESET output, while theAX6902/4 has an active high
RESET output. The reset comparator is designed to ignore fast transients on VCC, and
the outputs are guaranteed to be in the correct logic state for VCC down to 1V. Low
supply current makes theAX6901/2/3/4 ideal for use in portable equipment.
TheAX6901/2/3/4 is available in a 3-pin SOT23 package.
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FEATURES
- Precision Monitoring of +2.5,+3V, +3.3V, and +5V Power-Supply Voltages
- Fully Specified Over Temperature
- Available in Three Output Configurations
- Push-Pull RESET Low Output(AX6901/3)
- Push-Pull RESET High Output(AX6902/4
- 200ms (Typ.)min Power-On Reset Pulse Width
- 25µA Supply Current
- Guaranteed Reset Valid to VCC = +1V
- Power Supply Transient Immunity
- No External Components
- Available in the 3-Pin Pb-Free SOT23 Package
Axelite Confidential Materials, do not copy or distribute without written consent.
1/8
Rev.0.1 Nov.30, 2006
Free Datasheet http://www.datasheet4u.n
1 page  
AX6901/2/3/4(Preliminary)
Application Circuit
VCC
VCC
AX690X
RESET
(RESET)
GND
VCC
Microprocessor
RESET
INPUT
GND
Function Descriptions
A microprocessor’s (µP’s) reset input starts the µP in a known state.
TheAX6901/2/3/4 assert reset to prevent code-execution errors during power-up,
power-down, or brownout conditions. They assert a reset signal whenever the VCC
supply voltage declines below a preset threshold, keeping it asserted for at least 200ms
after VCC has risen above the reset threshold. TheAX6901/2/3/4 have a push-pull output
stage.
Application Information
Negative-Going VCC Transients
In addition to issuing a reset to the µP during power-up, power-down, and brownout
conditions, the AX6901/2/3/4 are relatively immune to short-duration negative-going VCC
transients (glitches).
The AX6901/2/3/4 do not generate a reset pulse. The graph was generated using a
negative going pulse applied to VCC, starting 0.5V above the actual reset threshold and
ending below it by the magnitude indicated (reset comparator overdrive). The graph
indicates the maximum pulse width a negative going VCC transient can have without
causing a reset pulse. As the magnitude of the transient increases (goes farther below the
reset threshold), the maximum allowable pulse width decreases. Typically, a VCC
transient that goes 50mV below the reset threshold A 0.1µF bypass capacitor mounted as
close as possible to the VCC pin provides additional transient immunity.
Ensuring a Valid Reset Output Down to VCC = 0
RESET is guaranteed to be a logic low for VCC > 1V. Once VCC exceeds the reset
threshold, an internal timer keeps RESET low for the reset timeout period; after this
interval, RESET goes high. If a brownout condition occurs (VCC dips below the reset
threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal
5/8
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.0.1 Nov.30, 2006
Free Datasheet http://www.datasheet4u.net/
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AX6902.PDF ] | |
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