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MAX810L Datasheet(PDF) 5 Page - Maxim Integrated Products

Part No. MAX810L
Description  MAX803/MAX809/MAX810 3-Pin Microprocessor Reset Circuits
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX810L Datasheet(HTML) 5 Page - Maxim Integrated Products

   
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MAX803/MAX809/MAX810
3-Pin Microprocessor Reset Circuits
5
Maxim Integrated
Detailed Description
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX803/MAX809/MAX810 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 140ms after VCC has risen above the reset thresh-
old. The MAX803 uses an open-drain output, and the
MAX809/MAX810 have a push-pull output stage.
Connect a pullup resistor on the MAX803’s RESET out-
put to any supply between 0 and 6V.
Applications Information
Negative-Going VCC Transients
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the MAX803/
MAX809/MAX810 are relatively immune to short-duration
negative-going VCC transients (glitches).
Figure 1 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX803/MAX809/
MAX810 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 end-
ing below it by the magnitude indicated (reset compara-
tor 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, for
the MAX8__L and MAX8__M, a VCC transient that goes
100mV below the reset threshold and lasts 20µs or less
will not cause a reset pulse. 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 = 0V
When VCC falls below 1V, the MAX809 RESET output
no longer sinks current—it becomes an open circuit.
2
RESET
(MAX803/
MAX809)
RESET Output remains low while VCC
is below the reset threshold, and for at
least 140ms after VCC rises above the
reset threshold.
1
GND
Ground
PIN
NAME
FUNCTION
RESET
(MAX810)
RESET Output remains high while VCC
is below the reset threshold, and for at
least 140ms after VCC rises above the
reset threshold.
3
VCC
Supply Voltage (+5V, +3.3V, +3.0V, or
+2.5V)
Selector Guide
TOP MARK
PART/SUFFIX
RESET THRESHOLD (V)
OUTPUT TYPE
SOT
SC70
MAX803L
4.63
OPEN-DRAIN
RESET
AAZ
MAX803M
4.38
OPEN-DRAIN
RESET
ABA
MAX803T
3.08
OPEN-DRAIN
RESET
ABB
MAX803S
2.93
OPEN-DRAIN
RESET
ABC
MAX803R
2.63
OPEN-DRAIN
RESET
ABD
MAX803Z
2.32
OPEN-DRAIN
RESET
ABE
MAX809L
4.63
PUSH-PULL
RESET
AAAA
AAN
MAX809M
4.38
PUSH-PULL
RESET
ABAA
AAO
MAX809J
4.00
PUSH-PULL
RESET
CWAA
MAX809T
3.08
PUSH-PULL
RESET
ACAA
AAP
MAX809S
2.93
PUSH-PULL
RESET
ADAA
AAQ
MAX809R
2.63
PUSH-PULL
RESET
AFAA
AAR
MAX809Z
2.32
PUSH-PULL
RESET
AAS
MAX810L
4.63
PUSH-PULL RESET
AGAA
AAT
MAX810M
4.38
PUSH-PULL RESET
AHAA
AAU
MAX810T
3.08
PUSH-PULL RESET
AJAA
AAV
MAX810S
2.93
PUSH-PULL RESET
AKAA
AAX
MAX810R
2.63
PUSH-PULL RESET
ALAA
AAW
MAX810Z
2.32
PUSH-PULL RESET
AAY
Pin Description


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